beeta/backend/src/controllers/RealmController.cpp

#include "RealmController.h"
#include "../services/DatabaseService.h"
#include "../services/StatsService.h"
#include "../services/RedisHelper.h"
#include "../services/OmeClient.h"
#include "../services/CensorService.h"
#include "../common/HttpHelpers.h"
#include "../common/AuthHelpers.h"
#include <drogon/utils/Utilities.h>
#include <drogon/Cookie.h>
#include <drogon/MultiPart.h>
#include <sstream>
#include <iomanip>
#include <regex>
#include <filesystem>
#include <cstdio>
#include <algorithm>
#include <openssl/rand.h>  // SECURITY FIX #4: Use cryptographic RNG

using namespace drogon::orm;

namespace {
    // SECURITY FIX #4: Use cryptographically secure random number generation
    // Replaces mt19937 (Mersenne Twister) which is NOT cryptographically secure
    std::string generateStreamKey() {
        unsigned char bytes[32];  // 32 bytes = 64 hex characters
        if (RAND_bytes(bytes, sizeof(bytes)) != 1) {
            LOG_ERROR << "Failed to generate cryptographically secure random bytes";
            throw std::runtime_error("Failed to generate secure stream key");
        }

        std::stringstream ss;
        for (size_t i = 0; i < sizeof(bytes); ++i) {
            ss << std::hex << std::setw(2) << std::setfill('0') << static_cast<int>(bytes[i]);
        }
        return ss.str();
    }
    
    bool validateRealmName(const std::string& name) {
        if (name.length() < 3 || name.length() > 30) {
            return false;
        }
        return std::regex_match(name, std::regex("^[a-z0-9-]+$"));
    }

    // SECURITY FIX #12: Safe file deletion with path traversal protection
    bool safeDeleteFile(const std::string& urlPath, const std::string& allowedDir) {
        try {
            if (urlPath.empty()) return false;

            // Construct full path
            std::filesystem::path fullPath = std::filesystem::weakly_canonical("." + urlPath);
            std::filesystem::path basePath = std::filesystem::canonical(allowedDir);

            // Verify path is within allowed directory
            auto [baseEnd, fullEnd] = std::mismatch(basePath.begin(), basePath.end(), fullPath.begin());
            if (baseEnd != basePath.end()) {
                LOG_WARN << "Path traversal attempt blocked: " << urlPath << " is not within " << allowedDir;
                return false;
            }

            // Path is safe, delete the file
            if (std::filesystem::exists(fullPath)) {
                std::filesystem::remove(fullPath);
                LOG_DEBUG << "Safely deleted file: " << fullPath.string();
                return true;
            }
            return false;
        } catch (const std::exception& e) {
            LOG_ERROR << "Error in safeDeleteFile: " << e.what();
            return false;
        }
    }
    
    // Sync chat settings to Redis db 1 (chat-service database)
    void syncChatSettingToRedis(const std::string& realmName, const std::string& field, const std::string& value) {
        try {
            sw::redis::ConnectionOptions opts;
            const char* envHost = std::getenv("REDIS_HOST");
            opts.host = envHost ? std::string(envHost) : "redis";
            const char* envPort = std::getenv("REDIS_PORT");
            opts.port = envPort ? std::stoi(envPort) : 6379;
            opts.db = 1;  // Chat-service uses db 1
            opts.socket_timeout = std::chrono::milliseconds(1000);

            auto redis = sw::redis::Redis(opts);
            std::string key = "chat:settings:realm:" + realmName;
            redis.hset(key, field, value);
            LOG_DEBUG << "Synced chat setting " << field << "=" << value << " for realm " << realmName;
        } catch (const sw::redis::Error& e) {
            LOG_ERROR << "Failed to sync chat setting to Redis: " << e.what();
        }
    }

    // Helper to create a new viewer token
    void createNewViewerToken(std::function<void(const HttpResponsePtr &)> callback, const std::string& streamKey) {
        auto bytes = drogon::utils::genRandomString(32);
        std::string token = drogon::utils::base64Encode(
            (const unsigned char*)bytes.data(), bytes.length()
        );

        RedisHelper::storeKeyAsync("viewer_token:" + token, streamKey, 300,
            [callback, token](bool stored) {
                if (!stored) {
                    auto resp = HttpResponse::newHttpResponse();
                    resp->setStatusCode(k500InternalServerError);
                    callback(resp);
                    return;
                }

                auto resp = HttpResponse::newHttpResponse();

                Cookie cookie("viewer_token", token);
                cookie.setPath("/");
                cookie.setHttpOnly(true);
                cookie.setSecure(false);
                cookie.setMaxAge(300);
                resp->addCookie(cookie);

                Json::Value body;
                body["success"] = true;
                body["viewer_token"] = token;
                body["expires_in"] = 300;

                resp->setContentTypeCode(CT_APPLICATION_JSON);
                resp->setBody(Json::FastWriter().write(body));
                callback(resp);
            }
        );
    }

    void invalidateKeyInRedis(const std::string& oldKey) {
        RedisHelper::addToSet("streams_to_disconnect", oldKey);
        RedisHelper::deleteKey("stream_key:" + oldKey);
        
        services::RedisHelper::instance().keysAsync("viewer_token:*", 
            [oldKey](const std::vector<std::string>& keys) {
                for (const auto& tokenKey : keys) {
                    services::RedisHelper::instance().getAsync(tokenKey,
                        [tokenKey, oldKey](sw::redis::OptionalString streamKey) {
                            if (streamKey.has_value() && streamKey.value() == oldKey) {
                                RedisHelper::deleteKey(tokenKey);
                            }
                        }
                    );
                }
            }
        );
    }
}

void RealmController::getUserRealms(const HttpRequestPtr &req,
                                   std::function<void(const HttpResponsePtr &)> &&callback) {
    UserInfo user = getUserFromRequest(req);
    if (user.id == 0) {
        callback(jsonError("Unauthorized", k401Unauthorized));
        return;
    }

    auto dbClient = app().getDbClient();
    *dbClient << "SELECT r.id, r.name, r.description, r.stream_key, r.realm_type, r.is_active, r.is_live, "
                 "r.viewer_count, r.chat_enabled, r.chat_guests_allowed, r.chat_slow_mode_seconds, "
                 "r.chat_retention_hours, r.offline_image_url, r.title_color, r.created_at, "
                 "(SELECT COUNT(*) FROM videos v WHERE v.realm_id = r.id AND v.status = 'ready') as video_count, "
                 "(SELECT COUNT(*) FROM audio_files a WHERE a.realm_id = r.id AND a.status = 'ready') as audio_count, "
                 "(SELECT COUNT(*) FROM ebooks e WHERE e.realm_id = r.id AND e.status = 'ready') as ebook_count "
                 "FROM realms r WHERE r.user_id = $1 ORDER BY r.created_at DESC"
              << user.id
              >> [callback](const Result& r) {
                  Json::Value resp;
                  resp["success"] = true;
                  Json::Value realms(Json::arrayValue);

                  for (const auto& row : r) {
                      Json::Value realm;
                      realm["id"] = static_cast<Json::Int64>(row["id"].as<int64_t>());
                      realm["name"] = row["name"].as<std::string>();
                      realm["description"] = row["description"].isNull() ? "" : row["description"].as<std::string>();
                      realm["type"] = row["realm_type"].isNull() ? "stream" : row["realm_type"].as<std::string>();
                      realm["streamKey"] = row["stream_key"].isNull() ? "" : row["stream_key"].as<std::string>();
                      realm["isActive"] = row["is_active"].as<bool>();
                      realm["isLive"] = row["is_live"].as<bool>();
                      realm["viewerCount"] = static_cast<Json::Int64>(row["viewer_count"].as<int64_t>());
                      realm["videoCount"] = static_cast<Json::Int64>(row["video_count"].as<int64_t>());
                      realm["audioCount"] = static_cast<Json::Int64>(row["audio_count"].as<int64_t>());
                      realm["ebookCount"] = static_cast<Json::Int64>(row["ebook_count"].as<int64_t>());
                      realm["chatEnabled"] = row["chat_enabled"].as<bool>();
                      realm["chatGuestsAllowed"] = row["chat_guests_allowed"].as<bool>();
                      realm["chatSlowModeSeconds"] = row["chat_slow_mode_seconds"].as<int>();
                      realm["chatRetentionHours"] = row["chat_retention_hours"].as<int>();
                      realm["offlineImageUrl"] = row["offline_image_url"].isNull() ? "" : row["offline_image_url"].as<std::string>();
                      realm["titleColor"] = row["title_color"].isNull() ? "#ffffff" : row["title_color"].as<std::string>();
                      realm["createdAt"] = row["created_at"].as<std::string>();
                      realms.append(realm);
                  }

                  resp["realms"] = realms;
                  callback(jsonResp(resp));
              }
              >> DB_ERROR_MSG(callback, "get realms", "Failed to get realms");
}

void RealmController::createRealm(const HttpRequestPtr &req,
                                 std::function<void(const HttpResponsePtr &)> &&callback) {
    UserInfo user = getUserFromRequest(req);
    if (user.id == 0) {
        callback(jsonError("Unauthorized", k401Unauthorized));
        return;
    }

    auto json = req->getJsonObject();
    if (!json) {
        callback(jsonError("Invalid JSON"));
        return;
    }

    std::string name = (*json)["name"].asString();
    std::string realmType = (*json).isMember("type") ? (*json)["type"].asString() : "stream";

    // Check for censored words in realm name
    if (CensorService::getInstance().containsCensoredWords(name)) {
        callback(jsonError("Realm name contains prohibited content"));
        return;
    }

    // Validate realm type
    if (realmType != "stream" && realmType != "video" && realmType != "audio" && realmType != "ebook" && realmType != "watch") {
        callback(jsonError("Invalid realm type. Must be 'stream', 'video', 'audio', 'ebook', or 'watch'"));
        return;
    }

    if (!validateRealmName(name)) {
        callback(jsonError("Realm name must be 3-30 characters, lowercase letters, numbers, and hyphens only"));
        return;
    }

    // Check permission based on realm type
    auto dbClient = app().getDbClient();
    *dbClient << "SELECT is_streamer, is_uploader, is_watch_creator FROM users WHERE id = $1"
              << user.id
              >> [req, callback, user, dbClient, name, realmType](const Result& r) {
                  if (r.empty()) {
                      callback(jsonError("User not found", k404NotFound));
                      return;
                  }

                  bool isStreamer = r[0]["is_streamer"].as<bool>();
                  bool isUploader = r[0]["is_uploader"].as<bool>();
                  bool isWatchCreator = r[0]["is_watch_creator"].isNull() ? false : r[0]["is_watch_creator"].as<bool>();

                  // Check permission based on realm type
                  if (realmType == "stream" && !isStreamer) {
                      callback(jsonError("You must be a streamer to create stream realms", k403Forbidden));
                      return;
                  }
                  if (realmType == "video" && !isUploader) {
                      callback(jsonError("You must be an uploader to create video realms", k403Forbidden));
                      return;
                  }
                  if (realmType == "audio" && !isUploader) {
                      callback(jsonError("You must be an uploader to create audio realms", k403Forbidden));
                      return;
                  }
                  if (realmType == "ebook" && !isUploader) {
                      callback(jsonError("You must be an uploader to create ebook realms", k403Forbidden));
                      return;
                  }
                  if (realmType == "watch" && !isWatchCreator) {
                      callback(jsonError("You must be a watch creator to create watch rooms", k403Forbidden));
                      return;
                  }

                  // Check if realm name already exists
                  *dbClient << "SELECT id FROM realms WHERE name = $1"
                           << name
                           >> [dbClient, user, name, realmType, callback](const Result& r2) {
                               if (!r2.empty()) {
                                   callback(jsonError("Realm name already taken"));
                                   return;
                               }

                               // Check user's realm limit (e.g., 5 realms per user)
                               *dbClient << "SELECT COUNT(*) as count FROM realms WHERE user_id = $1"
                                        << user.id
                                        >> [dbClient, user, name, realmType, callback](const Result& r3) {
                                            if (!r3.empty() && r3[0]["count"].as<int64_t>() >= 5) {
                                                callback(jsonError("You have reached the maximum number of realms (5)"));
                                                return;
                                            }

                                            if (realmType == "stream") {
                                                // Stream realm - generate stream key
                                                std::string streamKey = generateStreamKey();

                                                *dbClient << "INSERT INTO realms (user_id, name, stream_key, realm_type) "
                                                             "VALUES ($1, $2, $3, 'stream') RETURNING id"
                                                          << user.id << name << streamKey
                                                          >> [callback, name, streamKey](const Result& r4) {
                                                              if (r4.empty()) {
                                                                  callback(jsonError("Failed to create realm"));
                                                                  return;
                                                              }

                                                              // Store stream key in Redis
                                                              RedisHelper::storeKey("stream_key:" + streamKey, "1", 86400);

                                                              Json::Value resp;
                                                              resp["success"] = true;
                                                              resp["realm"]["id"] = static_cast<Json::Int64>(r4[0]["id"].as<int64_t>());
                                                              resp["realm"]["name"] = name;
                                                              resp["realm"]["streamKey"] = streamKey;
                                                              resp["realm"]["type"] = "stream";
                                                              callback(jsonResp(resp));
                                                          }
                                                          >> DB_ERROR_MSG(callback, "create realm", "Failed to create realm");
                                            } else if (realmType == "watch") {
                                                // Watch room - no stream key, initialize watch_room_state
                                                *dbClient << "INSERT INTO realms (user_id, name, realm_type) "
                                                             "VALUES ($1, $2, 'watch') RETURNING id"
                                                          << user.id << name
                                                          >> [callback, dbClient, name](const Result& r4) {
                                                              if (r4.empty()) {
                                                                  callback(jsonError("Failed to create realm"));
                                                                  return;
                                                              }

                                                              int64_t realmId = r4[0]["id"].as<int64_t>();

                                                              // Initialize watch_room_state
                                                              *dbClient << "INSERT INTO watch_room_state (realm_id) VALUES ($1)"
                                                                       << realmId
                                                                       >> [callback, name, realmId](const Result&) {
                                                                           Json::Value resp;
                                                                           resp["success"] = true;
                                                                           resp["realm"]["id"] = static_cast<Json::Int64>(realmId);
                                                                           resp["realm"]["name"] = name;
                                                                           resp["realm"]["type"] = "watch";
                                                                           callback(jsonResp(resp));
                                                                       }
                                                                       >> DB_ERROR_MSG(callback, "init watch state", "Failed to create watch room");
                                                          }
                                                          >> DB_ERROR_MSG(callback, "create realm", "Failed to create realm");
                                            } else {
                                                // Video, Audio, or Ebook realm - no stream key needed
                                                *dbClient << "INSERT INTO realms (user_id, name, realm_type) "
                                                             "VALUES ($1, $2, $3) RETURNING id"
                                                          << user.id << name << realmType
                                                          >> [callback, name, realmType](const Result& r4) {
                                                              if (r4.empty()) {
                                                                  callback(jsonError("Failed to create realm"));
                                                                  return;
                                                              }

                                                              Json::Value resp;
                                                              resp["success"] = true;
                                                              resp["realm"]["id"] = static_cast<Json::Int64>(r4[0]["id"].as<int64_t>());
                                                              resp["realm"]["name"] = name;
                                                              resp["realm"]["type"] = realmType;
                                                              callback(jsonResp(resp));
                                                          }
                                                          >> DB_ERROR_MSG(callback, "create realm", "Failed to create realm");
                                            }
                                        }
                                        >> DB_ERROR(callback, "count realms");
                           }
                           >> DB_ERROR(callback, "check realm name");
              }
              >> DB_ERROR(callback, "check user permissions");
}

void RealmController::issueRealmViewerToken(const HttpRequestPtr &req,
                                           std::function<void(const HttpResponsePtr &)> &&callback,
                                           const std::string &realmId) {
    int64_t id = std::stoll(realmId);

    // Check for existing viewer token to avoid creating duplicates on page refresh
    auto existingToken = req->getCookie("viewer_token");

    auto dbClient = app().getDbClient();
    *dbClient << "SELECT stream_key FROM realms WHERE id = $1 AND is_active = true"
              << id
              >> [callback, existingToken](const Result& r) {
                  if (r.empty()) {
                      callback(jsonResp({}, k404NotFound));
                      return;
                  }

                  std::string streamKey = r[0]["stream_key"].as<std::string>();

                  // If user has existing token, check if it's still valid for this stream
                  if (!existingToken.empty()) {
                      RedisHelper::getKeyAsync("viewer_token:" + existingToken,
                          [callback, existingToken, streamKey](const std::string& storedKey) {
                              if (storedKey == streamKey) {
                                  // Token is still valid for this stream - just refresh TTL and return it
                                  RedisHelper::storeKeyAsync("viewer_token:" + existingToken, streamKey, 300,
                                      [callback, existingToken](bool stored) {
                                          auto resp = HttpResponse::newHttpResponse();

                                          // Refresh cookie
                                          Cookie cookie("viewer_token", existingToken);
                                          cookie.setPath("/");
                                          cookie.setHttpOnly(true);
                                          cookie.setSecure(false);
                                          cookie.setMaxAge(300);
                                          resp->addCookie(cookie);

                                          Json::Value body;
                                          body["success"] = true;
                                          body["viewer_token"] = existingToken;
                                          body["expires_in"] = 300;
                                          body["reused"] = true;  // Indicate token was reused

                                          resp->setContentTypeCode(CT_APPLICATION_JSON);
                                          resp->setBody(Json::FastWriter().write(body));
                                          callback(resp);
                                      }
                                  );
                              } else {
                                  // Token invalid or for different stream - delete old and create new
                                  if (!storedKey.empty()) {
                                      RedisHelper::deleteKeyAsync("viewer_token:" + existingToken, [](bool){});
                                  }
                                  createNewViewerToken(callback, streamKey);
                              }
                          }
                      );
                  } else {
                      // No existing token, create new one
                      createNewViewerToken(callback, streamKey);
                  }
              }
              >> [callback](const DrogonDbException& e) {
                  LOG_ERROR << "Failed to issue viewer token: " << e.base().what();
                  callback(jsonResp({}, k500InternalServerError));
              };
}

void RealmController::getRealmStreamKey(const HttpRequestPtr &req,
                                       std::function<void(const HttpResponsePtr &)> &&callback,
                                       const std::string &realmId) {
    // Check for viewer token
    auto token = req->getCookie("viewer_token");
    if (token.empty()) {
        callback(jsonError("No viewer token", k403Forbidden));
        return;
    }
    
    int64_t id = std::stoll(realmId);
    
    // First get the stream key for this realm
    auto dbClient = app().getDbClient();
    *dbClient << "SELECT stream_key FROM realms WHERE id = $1 AND is_active = true"
              << id
              >> [token, callback](const Result& r) {
                  if (r.empty()) {
                      callback(jsonError("Realm not found", k404NotFound));
                      return;
                  }
                  
                  std::string streamKey = r[0]["stream_key"].as<std::string>();
                  
                  // Verify the token is valid for this stream
                  RedisHelper::getKeyAsync("viewer_token:" + token,
                      [callback, streamKey](const std::string& storedStreamKey) {
                          if (storedStreamKey != streamKey) {
                              callback(jsonError("Invalid token for this realm", k403Forbidden));
                              return;
                          }
                          
                          // Token is valid, return the stream key
                          Json::Value resp;
                          resp["success"] = true;
                          resp["streamKey"] = streamKey;
                          callback(jsonResp(resp));
                      }
                  );
              }
              >> DB_ERROR(callback, "get realm stream key");
}

void RealmController::getRealm(const HttpRequestPtr &, // Remove parameter name since it's unused
                              std::function<void(const HttpResponsePtr &)> &&callback,
                              const std::string &realmId) {
    // Remove authentication requirement for public viewing
    int64_t id = std::stoll(realmId);

    auto dbClient = app().getDbClient();
    *dbClient << "SELECT r.*, u.username FROM realms r "
                 "JOIN users u ON r.user_id = u.id "
                 "WHERE r.id = $1 AND r.is_active = true"
              << id
              >> [callback](const Result& r) {
                  if (r.empty()) {
                      callback(jsonError("Realm not found", k404NotFound));
                      return;
                  }

                  Json::Value resp;
                  resp["success"] = true;
                  auto& realm = resp["realm"];
                  realm["id"] = static_cast<Json::Int64>(r[0]["id"].as<int64_t>());
                  realm["name"] = r[0]["name"].as<std::string>();
                  realm["type"] = r[0]["realm_type"].isNull() ? "stream" : r[0]["realm_type"].as<std::string>();
                  // Don't expose stream key in public endpoint
                  // realm["streamKey"] = r[0]["stream_key"].as<std::string>();
                  realm["isActive"] = r[0]["is_active"].as<bool>();
                  realm["isLive"] = r[0]["is_live"].as<bool>();
                  realm["viewerCount"] = static_cast<Json::Int64>(r[0]["viewer_count"].as<int64_t>());
                  realm["createdAt"] = r[0]["created_at"].as<std::string>();
                  realm["username"] = r[0]["username"].as<std::string>();

                  callback(jsonResp(resp));
              }
              >> DB_ERROR(callback, "get realm");
}

void RealmController::updateRealm(const HttpRequestPtr &req,
                                 std::function<void(const HttpResponsePtr &)> &&callback,
                                 const std::string &realmId) {
    UserInfo user = getUserFromRequest(req);
    if (user.id == 0) {
        callback(jsonError("Unauthorized", k401Unauthorized));
        return;
    }
    
    // Parse realm ID
    int64_t id;
    try {
        id = std::stoll(realmId);
    } catch (...) {
        callback(jsonError("Invalid realm ID", k400BadRequest));
        return;
    }
    
    // Parse JSON body
    auto json = req->getJsonObject();
    if (!json) {
        callback(jsonError("Invalid JSON"));
        return;
    }

    // Verify the realm exists and belongs to the user
    auto dbClient = app().getDbClient();
    *dbClient << "SELECT id, name FROM realms WHERE id = $1 AND user_id = $2"
              << id << user.id
              >> [callback, json, dbClient, id, user](const Result& r) {
                  if (r.empty()) {
                      callback(jsonError("Realm not found or access denied", k404NotFound));
                      return;
                  }

                  std::string realmName = r[0]["name"].as<std::string>();

                  // Update chat_enabled if provided
                  if (json->isMember("chatEnabled")) {
                      bool chatEnabled = (*json)["chatEnabled"].asBool();
                      *dbClient << "UPDATE realms SET chat_enabled = $1 WHERE id = $2 AND user_id = $3"
                               << chatEnabled << id << user.id
                               >> [callback](const Result&) {
                                   Json::Value resp;
                                   resp["success"] = true;
                                   resp["message"] = "Realm updated successfully";
                                   callback(jsonResp(resp));
                               }
                               >> DB_ERROR_MSG(callback, "update realm", "Failed to update realm");
                  } else if (json->isMember("chatGuestsAllowed")) {
                      // Update chat_guests_allowed if provided
                      bool chatGuestsAllowed = (*json)["chatGuestsAllowed"].asBool();
                      *dbClient << "UPDATE realms SET chat_guests_allowed = $1 WHERE id = $2 AND user_id = $3"
                               << chatGuestsAllowed << id << user.id
                               >> [callback, realmName, chatGuestsAllowed](const Result&) {
                                   // Sync to Redis (chat-service database)
                                   syncChatSettingToRedis(realmName, "chatGuestsAllowed", chatGuestsAllowed ? "1" : "0");

                                   Json::Value resp;
                                   resp["success"] = true;
                                   resp["message"] = "Realm updated successfully";
                                   callback(jsonResp(resp));
                               }
                               >> DB_ERROR_MSG(callback, "update realm", "Failed to update realm");
                  } else if (json->isMember("chatSlowModeSeconds")) {
                      // Update chat slow mode seconds
                      int slowModeSeconds = (*json)["chatSlowModeSeconds"].asInt();
                      // Clamp to valid range (0-300)
                      if (slowModeSeconds < 0) slowModeSeconds = 0;
                      if (slowModeSeconds > 300) slowModeSeconds = 300;
                      *dbClient << "UPDATE realms SET chat_slow_mode_seconds = $1 WHERE id = $2 AND user_id = $3"
                               << slowModeSeconds << id << user.id
                               >> [callback](const Result&) {
                                   Json::Value resp;
                                   resp["success"] = true;
                                   resp["message"] = "Slow mode updated successfully";
                                   callback(jsonResp(resp));
                               }
                               >> DB_ERROR_MSG(callback, "update slow mode", "Failed to update slow mode");
                  } else if (json->isMember("chatRetentionHours")) {
                      // Update chat retention hours
                      int retentionHours = (*json)["chatRetentionHours"].asInt();
                      // Clamp to valid range (1-168)
                      if (retentionHours < 1) retentionHours = 1;
                      if (retentionHours > 168) retentionHours = 168;
                      *dbClient << "UPDATE realms SET chat_retention_hours = $1 WHERE id = $2 AND user_id = $3"
                               << retentionHours << id << user.id
                               >> [callback](const Result&) {
                                   Json::Value resp;
                                   resp["success"] = true;
                                   resp["message"] = "Message retention updated successfully";
                                   callback(jsonResp(resp));
                               }
                               >> DB_ERROR_MSG(callback, "update retention", "Failed to update retention");
                  } else if (json->isMember("name")) {
                      // Update realm name
                      std::string newName = (*json)["name"].asString();

                      // Validate name format
                      if (!validateRealmName(newName)) {
                          callback(jsonError("Invalid realm name. Use 3-30 lowercase letters, numbers, and hyphens only."));
                          return;
                      }

                      // Check if name is already taken by another realm
                      *dbClient << "SELECT id FROM realms WHERE name = $1 AND id != $2"
                               << newName << id
                               >> [callback, dbClient, id, user, newName](const Result& nameCheck) {
                                   if (!nameCheck.empty()) {
                                       callback(jsonError("Realm name is already taken"));
                                       return;
                                   }

                                   *dbClient << "UPDATE realms SET name = $1 WHERE id = $2 AND user_id = $3"
                                            << newName << id << user.id
                                            >> [callback, newName](const Result&) {
                                                Json::Value resp;
                                                resp["success"] = true;
                                                resp["message"] = "Realm renamed successfully";
                                                resp["name"] = newName;
                                                callback(jsonResp(resp));
                                            }
                                            >> DB_ERROR_MSG(callback, "rename realm", "Failed to rename realm");
                               }
                               >> DB_ERROR(callback, "check realm name");
                  } else if (json->isMember("description")) {
                      // Update realm description
                      std::string description = (*json)["description"].asString();

                      // Limit description length
                      if (description.length() > 500) {
                          description = description.substr(0, 500);
                      }

                      *dbClient << "UPDATE realms SET description = $1 WHERE id = $2 AND user_id = $3"
                               << description << id << user.id
                               >> [callback](const Result&) {
                                   Json::Value resp;
                                   resp["success"] = true;
                                   resp["message"] = "Description updated successfully";
                                   callback(jsonResp(resp));
                               }
                               >> DB_ERROR_MSG(callback, "update description", "Failed to update description");
                  } else {
                      Json::Value resp;
                      resp["success"] = true;
                      resp["message"] = "No changes to apply";
                      callback(jsonResp(resp));
                  }
              }
              >> DB_ERROR(callback, "verify realm ownership");
}

void RealmController::deleteRealm(const HttpRequestPtr &req,
                                 std::function<void(const HttpResponsePtr &)> &&callback,
                                 const std::string &realmId) {
    UserInfo user = getUserFromRequest(req);
    if (user.id == 0) {
        callback(jsonError("Unauthorized", k401Unauthorized));
        return;
    }

    int64_t id = std::stoll(realmId);

    auto dbClient = app().getDbClient();

    // First get the stream key to invalidate it (if it's a stream realm)
    *dbClient << "SELECT stream_key, realm_type FROM realms WHERE id = $1 AND user_id = $2"
              << id << user.id
              >> [dbClient, id, user, callback](const Result& r) {
                  if (r.empty()) {
                      callback(jsonError("Realm not found", k404NotFound));
                      return;
                  }

                  // Only invalidate stream key for stream realms
                  if (!r[0]["stream_key"].isNull()) {
                      std::string streamKey = r[0]["stream_key"].as<std::string>();
                      invalidateKeyInRedis(streamKey);
                  }

                  // Delete the realm (videos will be cascade deleted due to FK)
                  *dbClient << "DELETE FROM realms WHERE id = $1 AND user_id = $2"
                           << id << user.id
                           >> [callback](const Result&) {
                               Json::Value resp;
                               resp["success"] = true;
                               callback(jsonResp(resp));
                           }
                           >> DB_ERROR_MSG(callback, "delete realm", "Failed to delete realm");
              }
              >> DB_ERROR(callback, "get realm for delete");
}

void RealmController::regenerateRealmKey(const HttpRequestPtr &req,
                                        std::function<void(const HttpResponsePtr &)> &&callback,
                                        const std::string &realmId) {
    UserInfo user = getUserFromRequest(req);
    if (user.id == 0) {
        callback(jsonError("Unauthorized", k401Unauthorized));
        return;
    }

    int64_t id = std::stoll(realmId);

    auto dbClient = app().getDbClient();

    // Get old key
    *dbClient << "SELECT stream_key, realm_type FROM realms WHERE id = $1 AND user_id = $2"
              << id << user.id
              >> [dbClient, id, user, callback](const Result& r) {
                  if (r.empty()) {
                      callback(jsonError("Realm not found", k404NotFound));
                      return;
                  }

                  // Check if this is a stream realm
                  std::string realmType = r[0]["realm_type"].isNull() ? "stream" : r[0]["realm_type"].as<std::string>();
                  if (realmType != "stream") {
                      callback(jsonError("Cannot regenerate key for video realms", k400BadRequest));
                      return;
                  }

                  std::string oldKey = r[0]["stream_key"].as<std::string>();
                  invalidateKeyInRedis(oldKey);

                  std::string newKey = generateStreamKey();

                  *dbClient << "UPDATE realms SET stream_key = $1 WHERE id = $2 AND user_id = $3"
                           << newKey << id << user.id
                           >> [callback, newKey](const Result&) {
                               // Store new key in Redis
                               RedisHelper::storeKey("stream_key:" + newKey, "1", 86400);

                               Json::Value resp;
                               resp["success"] = true;
                               resp["streamKey"] = newKey;
                               callback(jsonResp(resp));
                           }
                           >> DB_ERROR_MSG(callback, "update stream key", "Failed to regenerate key");
              }
              >> DB_ERROR(callback, "get realm for key regen");
}

void RealmController::getRealmByName(const HttpRequestPtr &,
                                    std::function<void(const HttpResponsePtr &)> &&callback,
                                    const std::string &realmName) {
    auto dbClient = app().getDbClient();
    *dbClient << "SELECT r.id, r.name, r.realm_type, r.is_live, r.viewer_count, r.viewer_multiplier, "
                 "r.chat_enabled, r.chat_guests_allowed, "
                 "r.chat_slow_mode_seconds, r.chat_retention_hours, "
                 "r.offline_image_url, r.description, r.user_id, r.playlist_control_mode, r.playlist_whitelist, r.title_color, "
                 "r.live_started_at, "
                 "u.username, u.avatar_url, u.user_color FROM realms r "
                 "JOIN users u ON r.user_id = u.id "
                 "WHERE r.name = $1 AND r.is_active = true"
              << realmName
              >> [callback](const Result& r) {
                  if (r.empty()) {
                      callback(jsonError("Realm not found", k404NotFound));
                      return;
                  }

                  Json::Value resp;
                  resp["success"] = true;
                  auto& realm = resp["realm"];
                  realm["id"] = static_cast<Json::Int64>(r[0]["id"].as<int64_t>());
                  realm["name"] = r[0]["name"].as<std::string>();
                  realm["type"] = r[0]["realm_type"].isNull() ? "stream" : r[0]["realm_type"].as<std::string>();
                  realm["isLive"] = r[0]["is_live"].as<bool>();
                  // Apply viewer multiplier for visual "viewbotting" effect
                  int64_t viewerCount = r[0]["viewer_count"].as<int64_t>();
                  int multiplier = r[0]["viewer_multiplier"].isNull() ? 1 : r[0]["viewer_multiplier"].as<int>();
                  int64_t displayCount = viewerCount * multiplier;
                  // Add random 0-99 bonus when multiplier is active
                  if (multiplier > 1) {
                      static thread_local std::mt19937 rng(std::random_device{}());
                      std::uniform_int_distribution<int> dist(0, 99);
                      displayCount += dist(rng);
                  }
                  realm["viewerCount"] = static_cast<Json::Int64>(displayCount);
                  realm["chatEnabled"] = r[0]["chat_enabled"].as<bool>();
                  realm["chatGuestsAllowed"] = r[0]["chat_guests_allowed"].as<bool>();
                  realm["chatSlowModeSeconds"] = r[0]["chat_slow_mode_seconds"].as<int>();
                  realm["chatRetentionHours"] = r[0]["chat_retention_hours"].as<int>();
                  realm["offlineImageUrl"] = r[0]["offline_image_url"].isNull() ? "" : r[0]["offline_image_url"].as<std::string>();
                  realm["description"] = r[0]["description"].isNull() ? "" : r[0]["description"].as<std::string>();
                  realm["ownerId"] = static_cast<Json::Int64>(r[0]["user_id"].as<int64_t>());
                  realm["playlistControlMode"] = r[0]["playlist_control_mode"].isNull() ? "owner" : r[0]["playlist_control_mode"].as<std::string>();
                  realm["playlistWhitelist"] = r[0]["playlist_whitelist"].isNull() ? "[]" : r[0]["playlist_whitelist"].as<std::string>();
                  realm["username"] = r[0]["username"].as<std::string>();
                  realm["avatarUrl"] = r[0]["avatar_url"].isNull() ? "" : r[0]["avatar_url"].as<std::string>();
                  realm["colorCode"] = r[0]["user_color"].isNull() ? "" : r[0]["user_color"].as<std::string>();
                  realm["titleColor"] = r[0]["title_color"].isNull() ? "#ffffff" : r[0]["title_color"].as<std::string>();
                  // Include live_started_at for stream duration display
                  if (!r[0]["live_started_at"].isNull()) {
                      realm["liveStartedAt"] = r[0]["live_started_at"].as<std::string>();
                  }

                  callback(jsonResp(resp));
              }
              >> DB_ERROR(callback, "get realm by name");
}

void RealmController::getLiveRealms(const HttpRequestPtr &,
                                   std::function<void(const HttpResponsePtr &)> &&callback) {
    auto dbClient = app().getDbClient();
    // SECURITY: Do NOT expose stream_key in public API - it allows stream hijacking
    *dbClient << "SELECT r.name, r.viewer_count, r.viewer_multiplier, r.offline_image_url, r.title_color, "
                 "u.username, u.avatar_url "
                 "FROM realms r JOIN users u ON r.user_id = u.id "
                 "WHERE r.is_live = true AND r.is_active = true "
                 "ORDER BY (r.viewer_count * COALESCE(r.viewer_multiplier, 1)) DESC"
              >> [callback](const Result& r) {
                  Json::Value resp(Json::arrayValue);

                  for (const auto& row : r) {
                      Json::Value realm;
                      realm["name"] = row["name"].as<std::string>();
                      // stream_key intentionally omitted - security fix
                      // Apply viewer multiplier for visual "viewbotting" effect
                      int64_t viewerCount = row["viewer_count"].as<int64_t>();
                      int multiplier = row["viewer_multiplier"].isNull() ? 1 : row["viewer_multiplier"].as<int>();
                      int64_t displayCount = viewerCount * multiplier;
                      // Add random 0-99 bonus when multiplier is active
                      if (multiplier > 1) {
                          static thread_local std::mt19937 rng(std::random_device{}());
                          std::uniform_int_distribution<int> dist(0, 99);
                          displayCount += dist(rng);
                      }
                      realm["viewerCount"] = static_cast<Json::Int64>(displayCount);
                      realm["username"] = row["username"].as<std::string>();
                      realm["avatarUrl"] = row["avatar_url"].isNull() ? "" : row["avatar_url"].as<std::string>();
                      realm["offlineImageUrl"] = row["offline_image_url"].isNull() ? "" : row["offline_image_url"].as<std::string>();
                      realm["titleColor"] = row["title_color"].isNull() ? "#ffffff" : row["title_color"].as<std::string>();
                      resp.append(realm);
                  }

                  callback(jsonResp(resp));
              }
              >> DB_ERROR(callback, "get live realms");
}

void RealmController::getAllRealms(const HttpRequestPtr &,
                                   std::function<void(const HttpResponsePtr &)> &&callback) {
    auto dbClient = app().getDbClient();
    // Only show stream realms in the public list (video realms are accessed via /videos)
    // SECURITY: Do NOT expose stream_key in public API - it allows stream hijacking
    *dbClient << "SELECT r.id, r.name, r.realm_type, r.is_live, r.viewer_count, r.viewer_multiplier, "
                 "r.chat_enabled, r.chat_guests_allowed, "
                 "r.offline_image_url, r.title_color, u.username, u.avatar_url, u.user_color "
                 "FROM realms r JOIN users u ON r.user_id = u.id "
                 "WHERE r.is_active = true AND (r.realm_type = 'stream' OR r.realm_type IS NULL) "
                 "ORDER BY r.is_live DESC, (r.viewer_count * COALESCE(r.viewer_multiplier, 1)) DESC, r.name ASC"
              >> [callback](const Result& r) {
                  Json::Value resp;
                  Json::Value realms(Json::arrayValue);

                  for (const auto& row : r) {
                      Json::Value realm;
                      realm["id"] = static_cast<Json::Int64>(row["id"].as<int64_t>());
                      realm["name"] = row["name"].as<std::string>();
                      realm["type"] = row["realm_type"].isNull() ? "stream" : row["realm_type"].as<std::string>();
                      // stream_key intentionally omitted - security fix
                      realm["isLive"] = row["is_live"].as<bool>();
                      // Apply viewer multiplier for visual "viewbotting" effect
                      int64_t viewerCount = row["viewer_count"].as<int64_t>();
                      int multiplier = row["viewer_multiplier"].isNull() ? 1 : row["viewer_multiplier"].as<int>();
                      int64_t displayCount = viewerCount * multiplier;
                      // Add random 0-99 bonus when multiplier is active
                      if (multiplier > 1) {
                          static thread_local std::mt19937 rng(std::random_device{}());
                          std::uniform_int_distribution<int> dist(0, 99);
                          displayCount += dist(rng);
                      }
                      realm["viewerCount"] = static_cast<Json::Int64>(displayCount);
                      realm["chatEnabled"] = row["chat_enabled"].as<bool>();
                      realm["chatGuestsAllowed"] = row["chat_guests_allowed"].as<bool>();
                      realm["offlineImageUrl"] = row["offline_image_url"].isNull() ? "" : row["offline_image_url"].as<std::string>();
                      realm["titleColor"] = row["title_color"].isNull() ? "#ffffff" : row["title_color"].as<std::string>();
                      realm["username"] = row["username"].as<std::string>();
                      realm["avatarUrl"] = row["avatar_url"].isNull() ? "" : row["avatar_url"].as<std::string>();
                      realm["colorCode"] = row["user_color"].isNull() ? "#561D5E" : row["user_color"].as<std::string>();
                      realms.append(realm);
                  }

                  resp["success"] = true;
                  resp["realms"] = realms;
                  callback(jsonResp(resp));
              }
              >> DB_ERROR(callback, "get all realms");
}

void RealmController::validateRealmKey(const HttpRequestPtr &,
                                      std::function<void(const HttpResponsePtr &)> &&callback,
                                      const std::string &key) {
    auto dbClient = app().getDbClient();
    *dbClient << "SELECT id FROM realms WHERE stream_key = $1 AND is_active = true"
              << key
              >> [callback, key](const Result& r) {
                  bool valid = !r.empty();
                  if (valid) {
                      // Store in Redis
                      RedisHelper::storeKey("stream_key:" + key, "1", 86400);
                  }
                  
                  Json::Value resp;
                  resp["valid"] = valid;
                  callback(jsonResp(resp));
              }
              >> [callback](const DrogonDbException& e) {
                  LOG_ERROR << "Database error: " << e.base().what();
                  Json::Value resp;
                  resp["valid"] = false;
                  callback(jsonResp(resp));
              };
}

void RealmController::getRealmStats(const HttpRequestPtr &,
                                   std::function<void(const HttpResponsePtr &)> &&callback,
                                   const std::string &realmId) {
    // Public endpoint - no authentication required
    int64_t id = std::stoll(realmId);

    auto dbClient = app().getDbClient();
    *dbClient << "SELECT stream_key, viewer_multiplier FROM realms WHERE id = $1"
              << id
              >> [callback](const Result& r) {
                  if (r.empty()) {
                      callback(jsonError("Realm not found", k404NotFound));
                      return;
                  }

                  std::string streamKey = r[0]["stream_key"].as<std::string>();
                  int multiplier = r[0]["viewer_multiplier"].isNull() ? 1 : r[0]["viewer_multiplier"].as<int>();

                  StatsService::getInstance().getStreamStats(streamKey,
                      [callback, multiplier](bool success, const StreamStats& stats) {
                          if (success) {
                              Json::Value json;
                              json["success"] = true;

                              // Calculate random bonus when multiplier is active
                              int randomBonus = 0;
                              if (multiplier > 1) {
                                  static thread_local std::mt19937 rng(std::random_device{}());
                                  std::uniform_int_distribution<int> dist(0, 99);
                                  randomBonus = dist(rng);
                              }

                              auto& s = json["stats"];
                              // Apply viewer multiplier for visual "viewbotting" effect
                              s["connections"] = static_cast<Json::Int64>(stats.uniqueViewers * multiplier + randomBonus);
                              s["total_connections"] = static_cast<Json::Int64>(stats.totalConnections * multiplier + randomBonus);
                              s["bytes_in"] = static_cast<Json::Int64>(stats.totalBytesIn);
                              s["bytes_out"] = static_cast<Json::Int64>(stats.totalBytesOut);
                              s["bitrate"] = stats.bitrate;
                              s["codec"] = stats.codec;
                              s["resolution"] = stats.resolution;
                              s["fps"] = stats.fps;
                              s["is_live"] = stats.isLive;

                              // Protocol breakdown (also multiplied for consistency)
                              auto& pc = s["protocol_connections"];
                              pc["webrtc"] = static_cast<Json::Int64>(stats.protocolConnections.webrtc * multiplier);
                              pc["hls"] = static_cast<Json::Int64>(stats.protocolConnections.hls * multiplier);
                              pc["llhls"] = static_cast<Json::Int64>(stats.protocolConnections.llhls * multiplier);
                              pc["dash"] = static_cast<Json::Int64>(stats.protocolConnections.dash * multiplier);

                              callback(jsonResp(json));
                          } else {
                              callback(jsonError("Failed to retrieve stats"));
                          }
                      });
              }
              >> DB_ERROR(callback, "get realm stats");
}

void RealmController::getPublicUserRealms(const HttpRequestPtr &,
                                         std::function<void(const HttpResponsePtr &)> &&callback,
                                         const std::string &username) {
    auto dbClient = app().getDbClient();
    *dbClient << "SELECT r.id, r.name, r.realm_type, r.is_live, r.viewer_count, r.viewer_multiplier, "
                 "r.title_color, r.created_at, "
                 "(SELECT COUNT(*) FROM videos v WHERE v.realm_id = r.id AND v.status = 'ready') as video_count "
                 "FROM realms r "
                 "JOIN users u ON r.user_id = u.id "
                 "WHERE u.username = $1 AND r.is_active = true "
                 "ORDER BY r.realm_type ASC, r.is_live DESC, r.created_at DESC"
              << username
              >> [callback](const Result& r) {
                  Json::Value resp;
                  resp["success"] = true;
                  Json::Value realms(Json::arrayValue);

                  for (const auto& row : r) {
                      Json::Value realm;
                      realm["id"] = static_cast<Json::Int64>(row["id"].as<int64_t>());
                      realm["name"] = row["name"].as<std::string>();
                      realm["type"] = row["realm_type"].isNull() ? "stream" : row["realm_type"].as<std::string>();
                      realm["isLive"] = row["is_live"].as<bool>();
                      // Apply viewer multiplier for visual "viewbotting" effect
                      int64_t viewerCount = row["viewer_count"].as<int64_t>();
                      int multiplier = row["viewer_multiplier"].isNull() ? 1 : row["viewer_multiplier"].as<int>();
                      int64_t displayCount = viewerCount * multiplier;
                      // Add random 0-99 bonus when multiplier is active
                      if (multiplier > 1) {
                          static thread_local std::mt19937 rng(std::random_device{}());
                          std::uniform_int_distribution<int> dist(0, 99);
                          displayCount += dist(rng);
                      }
                      realm["viewerCount"] = static_cast<Json::Int64>(displayCount);
                      realm["titleColor"] = row["title_color"].isNull() ? "#ffffff" : row["title_color"].as<std::string>();
                      realm["videoCount"] = static_cast<Json::Int64>(row["video_count"].as<int64_t>());
                      realm["createdAt"] = row["created_at"].as<std::string>();
                      realms.append(realm);
                  }

                  resp["realms"] = realms;
                  callback(jsonResp(resp));
              }
              >> DB_ERROR(callback, "get user realms");
}

void RealmController::uploadOfflineImage(const HttpRequestPtr &req,
                                        std::function<void(const HttpResponsePtr &)> &&callback,
                                        const std::string &realmId) {
    UserInfo user = getUserFromRequest(req);
    if (user.id == 0) {
        callback(jsonError("Unauthorized", k401Unauthorized));
        return;
    }

    int64_t id;
    try {
        id = std::stoll(realmId);
    } catch (...) {
        callback(jsonError("Invalid realm ID", k400BadRequest));
        return;
    }

    // Get file from multipart form
    MultiPartParser fileParser;
    if (fileParser.parse(req) != 0 || fileParser.getFiles().empty()) {
        callback(jsonError("No file uploaded"));
        return;
    }

    auto& file = fileParser.getFiles()[0];

    // Check file extension for allowed formats (supports animated GIF/WebP)
    std::string filename = file.getFileName();
    std::string ext;
    auto dotPos = filename.find_last_of('.');
    if (dotPos != std::string::npos) {
        ext = filename.substr(dotPos);
        std::transform(ext.begin(), ext.end(), ext.begin(), ::tolower);
    }
    if (ext != ".jpg" && ext != ".jpeg" && ext != ".png" && ext != ".gif" && ext != ".webp") {
        callback(jsonError("Invalid file type. Only JPEG, PNG, GIF, and WebP are allowed."));
        return;
    }

    // Check file size (max 5MB)
    if (file.fileLength() > 5 * 1024 * 1024) {
        callback(jsonError("File too large. Maximum size is 5MB."));
        return;
    }

    auto dbClient = app().getDbClient();

    // Verify realm ownership and get old image path
    *dbClient << "SELECT offline_image_url, realm_type FROM realms WHERE id = $1 AND user_id = $2"
              << id << user.id
              >> [callback, dbClient, id, user, file = std::move(file)](const Result& r) mutable {
                  if (r.empty()) {
                      callback(jsonError("Realm not found or access denied", k404NotFound));
                      return;
                  }

                  // Only allow for stream and watch realms
                  std::string realmType = r[0]["realm_type"].isNull() ? "stream" : r[0]["realm_type"].as<std::string>();
                  if (realmType != "stream" && realmType != "watch") {
                      callback(jsonError("Offline images are only supported for stream and watch realms", k400BadRequest));
                      return;
                  }

                  // Delete old image if exists (SECURITY FIX #12: Use safe delete with path validation)
                  if (!r[0]["offline_image_url"].isNull()) {
                      std::string oldPath = r[0]["offline_image_url"].as<std::string>();
                      safeDeleteFile(oldPath, "./uploads/offline");
                  }

                  // Save new file
                  std::string uploadDir = "./uploads/offline";
                  std::filesystem::create_directories(uploadDir);

                  // Generate unique filename
                  std::string ext = file.getFileName().substr(file.getFileName().find_last_of("."));
                  std::string filename = "realm_" + std::to_string(id) + "_" +
                                        std::to_string(std::chrono::system_clock::now().time_since_epoch().count()) + ext;
                  std::string savePath = uploadDir + "/" + filename;
                  std::string urlPath = "/uploads/offline/" + filename;

                  // Save file
                  file.saveAs(savePath);

                  // Update database
                  *dbClient << "UPDATE realms SET offline_image_url = $1 WHERE id = $2 AND user_id = $3"
                           << urlPath << id << user.id
                           >> [callback, urlPath](const Result&) {
                               Json::Value resp;
                               resp["success"] = true;
                               resp["offlineImageUrl"] = urlPath;
                               resp["message"] = "Offline image uploaded successfully";
                               callback(jsonResp(resp));
                           }
                           >> DB_ERROR_MSG(callback, "update offline image", "Failed to update offline image");
              }
              >> DB_ERROR(callback, "verify realm ownership");
}

void RealmController::deleteOfflineImage(const HttpRequestPtr &req,
                                        std::function<void(const HttpResponsePtr &)> &&callback,
                                        const std::string &realmId) {
    UserInfo user = getUserFromRequest(req);
    if (user.id == 0) {
        callback(jsonError("Unauthorized", k401Unauthorized));
        return;
    }

    int64_t id;
    try {
        id = std::stoll(realmId);
    } catch (...) {
        callback(jsonError("Invalid realm ID", k400BadRequest));
        return;
    }

    auto dbClient = app().getDbClient();

    // Get old image path and verify ownership
    *dbClient << "SELECT offline_image_url FROM realms WHERE id = $1 AND user_id = $2"
              << id << user.id
              >> [callback, dbClient, id, user](const Result& r) {
                  if (r.empty()) {
                      callback(jsonError("Realm not found or access denied", k404NotFound));
                      return;
                  }

                  // Delete file if exists (SECURITY FIX #12: Use safe delete with path validation)
                  if (!r[0]["offline_image_url"].isNull()) {
                      std::string oldPath = r[0]["offline_image_url"].as<std::string>();
                      safeDeleteFile(oldPath, "./uploads/offline");
                  }

                  // Clear database field
                  *dbClient << "UPDATE realms SET offline_image_url = NULL WHERE id = $1 AND user_id = $2"
                           << id << user.id
                           >> [callback](const Result&) {
                               Json::Value resp;
                               resp["success"] = true;
                               resp["message"] = "Offline image deleted successfully";
                               callback(jsonResp(resp));
                           }
                           >> DB_ERROR_MSG(callback, "delete offline image", "Failed to delete offline image");
              }
              >> DB_ERROR(callback, "get realm for delete image");
}

void RealmController::getRealmModerators(const HttpRequestPtr &req,
                                        std::function<void(const HttpResponsePtr &)> &&callback,
                                        const std::string &realmId) {
    UserInfo user = getUserFromRequest(req);
    if (user.id == 0) {
        callback(jsonError("Unauthorized", k401Unauthorized));
        return;
    }

    int64_t id;
    try {
        id = std::stoll(realmId);
    } catch (...) {
        callback(jsonError("Invalid realm ID", k400BadRequest));
        return;
    }

    auto dbClient = app().getDbClient();

    // Verify user is realm owner or admin
    *dbClient << "SELECT user_id FROM realms WHERE id = $1"
              << id
              >> [callback, dbClient, id, user](const Result& r) {
                  if (r.empty()) {
                      callback(jsonError("Realm not found", k404NotFound));
                      return;
                  }

                  int64_t ownerId = r[0]["user_id"].as<int64_t>();
                  if (ownerId != user.id && !user.isAdmin) {
                      callback(jsonError("Access denied", k403Forbidden));
                      return;
                  }

                  // Get moderators for this realm
                  *dbClient << "SELECT u.id, u.username, u.avatar_url, u.user_color, cm.granted_at "
                               "FROM chat_moderators cm "
                               "JOIN users u ON cm.user_id = u.id "
                               "WHERE cm.realm_id = $1 "
                               "ORDER BY cm.granted_at DESC"
                            << id
                            >> [callback](const Result& r2) {
                                Json::Value resp;
                                resp["success"] = true;
                                Json::Value moderators(Json::arrayValue);

                                for (const auto& row : r2) {
                                    Json::Value mod;
                                    mod["id"] = static_cast<Json::Int64>(row["id"].as<int64_t>());
                                    mod["username"] = row["username"].as<std::string>();
                                    mod["avatarUrl"] = row["avatar_url"].isNull() ? "" : row["avatar_url"].as<std::string>();
                                    mod["colorCode"] = row["user_color"].isNull() ? "#561D5E" : row["user_color"].as<std::string>();
                                    mod["grantedAt"] = row["granted_at"].as<std::string>();
                                    moderators.append(mod);
                                }

                                resp["moderators"] = moderators;
                                callback(jsonResp(resp));
                            }
                            >> DB_ERROR_MSG(callback, "get moderators", "Failed to get moderators");
              }
              >> DB_ERROR(callback, "check realm ownership");
}

void RealmController::addRealmModerator(const HttpRequestPtr &req,
                                       std::function<void(const HttpResponsePtr &)> &&callback,
                                       const std::string &realmId) {
    UserInfo user = getUserFromRequest(req);
    if (user.id == 0) {
        callback(jsonError("Unauthorized", k401Unauthorized));
        return;
    }

    int64_t id;
    try {
        id = std::stoll(realmId);
    } catch (...) {
        callback(jsonError("Invalid realm ID", k400BadRequest));
        return;
    }

    auto json = req->getJsonObject();
    if (!json || !(*json)["userId"].isInt64()) {
        callback(jsonError("userId is required", k400BadRequest));
        return;
    }

    int64_t targetUserId = (*json)["userId"].asInt64();

    auto dbClient = app().getDbClient();

    // Verify user is realm owner or admin
    *dbClient << "SELECT user_id FROM realms WHERE id = $1"
              << id
              >> [callback, dbClient, id, user, targetUserId](const Result& r) {
                  if (r.empty()) {
                      callback(jsonError("Realm not found", k404NotFound));
                      return;
                  }

                  int64_t ownerId = r[0]["user_id"].as<int64_t>();
                  if (ownerId != user.id && !user.isAdmin) {
                      callback(jsonError("Only realm owner can add moderators", k403Forbidden));
                      return;
                  }

                  // Check if target user exists
                  *dbClient << "SELECT id, username FROM users WHERE id = $1"
                            << targetUserId
                            >> [callback, dbClient, id, targetUserId](const Result& r2) {
                                if (r2.empty()) {
                                    callback(jsonError("User not found", k404NotFound));
                                    return;
                                }

                                std::string username = r2[0]["username"].as<std::string>();

                                // Insert moderator (ignore if already exists)
                                *dbClient << "INSERT INTO chat_moderators (realm_id, user_id) VALUES ($1, $2) "
                                             "ON CONFLICT (realm_id, user_id) DO NOTHING"
                                          << id << targetUserId
                                          >> [callback, username](const Result&) {
                                              Json::Value resp;
                                              resp["success"] = true;
                                              resp["message"] = username + " added as moderator";
                                              callback(jsonResp(resp));
                                          }
                                          >> DB_ERROR_MSG(callback, "add moderator", "Failed to add moderator");
                            }
                            >> DB_ERROR(callback, "check user exists");
              }
              >> DB_ERROR(callback, "check realm ownership");
}

void RealmController::removeRealmModerator(const HttpRequestPtr &req,
                                          std::function<void(const HttpResponsePtr &)> &&callback,
                                          const std::string &realmId,
                                          const std::string &moderatorId) {
    UserInfo user = getUserFromRequest(req);
    if (user.id == 0) {
        callback(jsonError("Unauthorized", k401Unauthorized));
        return;
    }

    int64_t id, modId;
    try {
        id = std::stoll(realmId);
        modId = std::stoll(moderatorId);
    } catch (...) {
        callback(jsonError("Invalid ID", k400BadRequest));
        return;
    }

    auto dbClient = app().getDbClient();

    // Verify user is realm owner or admin
    *dbClient << "SELECT user_id FROM realms WHERE id = $1"
              << id
              >> [callback, dbClient, id, modId, user](const Result& r) {
                  if (r.empty()) {
                      callback(jsonError("Realm not found", k404NotFound));
                      return;
                  }

                  int64_t ownerId = r[0]["user_id"].as<int64_t>();
                  if (ownerId != user.id && !user.isAdmin) {
                      callback(jsonError("Only realm owner can remove moderators", k403Forbidden));
                      return;
                  }

                  // Remove moderator
                  *dbClient << "DELETE FROM chat_moderators WHERE realm_id = $1 AND user_id = $2"
                            << id << modId
                            >> [callback](const Result&) {
                                Json::Value resp;
                                resp["success"] = true;
                                resp["message"] = "Moderator removed";
                                callback(jsonResp(resp));
                            }
                            >> DB_ERROR_MSG(callback, "remove moderator", "Failed to remove moderator");
              }
              >> DB_ERROR(callback, "check realm ownership");
}

void RealmController::updateTitleColor(const HttpRequestPtr &req,
                                       std::function<void(const HttpResponsePtr &)> &&callback,
                                       const std::string &realmId) {
    UserInfo user = getUserFromRequest(req);
    if (user.id == 0) {
        callback(jsonError("Unauthorized", k401Unauthorized));
        return;
    }

    int64_t id;
    try {
        id = std::stoll(realmId);
    } catch (...) {
        callback(jsonError("Invalid realm ID", k400BadRequest));
        return;
    }

    auto json = req->getJsonObject();
    if (!json) {
        callback(jsonError("Invalid JSON"));
        return;
    }

    if (!(*json).isMember("titleColor")) {
        callback(jsonError("Title color is required"));
        return;
    }

    std::string titleColor = (*json)["titleColor"].asString();

    // Validate title color format (hex color)
    if (titleColor.length() != 7 || titleColor[0] != '#') {
        callback(jsonError("Invalid color format. Use hex format like #ffffff"));
        return;
    }

    // Validate hex characters
    for (size_t i = 1; i < titleColor.length(); ++i) {
        char c = titleColor[i];
        if (!((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'))) {
            callback(jsonError("Invalid color format. Use hex format like #ffffff"));
            return;
        }
    }

    auto dbClient = app().getDbClient();

    // Verify realm ownership
    *dbClient << "SELECT user_id FROM realms WHERE id = $1"
              << id
              >> [callback, dbClient, id, user, titleColor](const Result& r) {
                  if (r.empty()) {
                      callback(jsonError("Realm not found", k404NotFound));
                      return;
                  }

                  int64_t ownerId = r[0]["user_id"].as<int64_t>();
                  if (ownerId != user.id && !user.isAdmin) {
                      callback(jsonError("You don't have permission to modify this realm", k403Forbidden));
                      return;
                  }

                  // Update title color
                  *dbClient << "UPDATE realms SET title_color = $1, updated_at = CURRENT_TIMESTAMP WHERE id = $2"
                           << titleColor << id
                           >> [callback, titleColor](const Result&) {
                               Json::Value resp;
                               resp["success"] = true;
                               resp["titleColor"] = titleColor;
                               callback(jsonResp(resp));
                           }
                           >> DB_ERROR(callback, "update title color");
              }
              >> DB_ERROR(callback, "check realm ownership");
}

// Internal endpoint for Lua thumbnail generator to lookup stream key by realm name
void RealmController::getStreamKeyByRealmName(const HttpRequestPtr &req,
                                              std::function<void(const HttpResponsePtr &)> &&callback,
                                              const std::string &realmName) {
    auto dbClient = app().getDbClient();

    *dbClient << "SELECT stream_key FROM realms WHERE name = $1 AND is_live = true AND is_active = true"
              << realmName
              >> [callback](const Result& r) {
                  if (r.empty()) {
                      callback(jsonError("Realm not found or not live", k404NotFound));
                      return;
                  }

                  Json::Value resp;
                  resp["streamKey"] = r[0]["stream_key"].as<std::string>();
                  callback(jsonResp(resp));
              }
              >> DB_ERROR(callback, "get stream key by realm name");
}