import {
	connectionStatus,
	chatUserInfo,
	addMessage,
	removeMessage,
	setMessageHistory,
	currentRealmId,
	participants
} from './chatStore';
import { get } from 'svelte/store';
import { getGuestFingerprint } from '$lib/fingerprint';

class ChatWebSocket {
	constructor() {
		this.ws = null;
		this.realmId = null;
		this.token = null;
		this.reconnectAttempts = 0;
		this.maxReconnectAttempts = 5;
		this.reconnectDelay = 1000;
		this.maxReconnectDelay = 30000; // Cap delay at 30 seconds
		this.messageHandlers = [];
		this.reconnectResetTimer = null;
	}

	async connect(realmId, token = null) {
		if (this.ws && this.ws.readyState === WebSocket.OPEN) {
			// Already connected, just switch realm
			if (this.realmId !== realmId) {
				this.joinRealm(realmId);
			}
			return;
		}

		this.realmId = realmId;
		this.token = token;

		// SECURITY FIX #9: Don't include token in URL query params
		// Token will be sent as first message after connection to avoid logging/exposure
		// Use wss:// for HTTPS, ws:// for HTTP (dynamic protocol detection)
		const wsProtocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
		let wsUrl = `${wsProtocol}//${window.location.host}/chat/ws?realmId=${encodeURIComponent(realmId)}`;

		// Guest connection - generate fingerprint for ban enforcement
		// Only guests are fingerprinted, registered users are NOT fingerprinted for privacy
		if (!token) {
			try {
				const fingerprint = await getGuestFingerprint();
				if (fingerprint) {
					wsUrl += `&fp=${encodeURIComponent(fingerprint)}`;
				}
			} catch (e) {
				console.warn('Failed to generate fingerprint:', e);
			}
		}

		console.log('[ChatWebSocket] Connecting to:', wsUrl, 'Token present:', !!token);

		connectionStatus.set('connecting');

		try {
			this.ws = new WebSocket(wsUrl);

			this.ws.onopen = () => {
				console.log('Chat WebSocket connected');
				connectionStatus.set('connected');
				this.reconnectAttempts = 0;
				currentRealmId.set(realmId);

				// SECURITY FIX #9: Send auth token as first message (not in URL)
				if (this.token) {
					this.ws.send(JSON.stringify({ type: 'auth', token: this.token }));
				}

				// Send join message to subscribe to the realm
				this.joinRealm(realmId);
			};

			this.ws.onmessage = (event) => {
				try {
					const data = JSON.parse(event.data);
					this.handleMessage(data);
				} catch (error) {
					console.error('Failed to parse WebSocket message:', error);
				}
			};

			this.ws.onerror = (error) => {
				console.error('Chat WebSocket error:', error);
			};

			this.ws.onclose = () => {
				console.log('Chat WebSocket closed');
				connectionStatus.set('disconnected');
				this.attemptReconnect();
			};
		} catch (error) {
			console.error('Failed to create WebSocket:', error);
			connectionStatus.set('disconnected');
		}
	}

	handleMessage(data) {
		switch (data.type) {
			case 'welcome':
				// If we have a token, we're about to authenticate - don't set guest info
				// The auth_success message will set the correct user info
				if (!this.token) {
					chatUserInfo.set({
						username: data.username,
						userId: data.userId,
						isGuest: data.isGuest,
						isModerator: data.isModerator,
						isSiteModerator: data.isSiteModerator || false,
						isStreamer: data.isStreamer || false,
						isAdmin: data.isAdmin || false,
						avatarUrl: data.avatarUrl || ''
					});

					// If guest and has saved name in localStorage, rename immediately
					if (data.isGuest && typeof localStorage !== 'undefined') {
						const savedGuestName = localStorage.getItem('guestName');
						if (savedGuestName && savedGuestName !== data.username) {
							console.log('Restoring saved guest name:', savedGuestName);
							// Delay slightly to ensure connection is fully established
							setTimeout(() => {
								this.sendRename(savedGuestName);
							}, 100);
						}
					}
				}
				break;

			case 'history':
				setMessageHistory(data.messages || []);
				break;

			case 'new_message':
				addMessage(data);
				break;

			case 'message_deleted':
				removeMessage(data.messageId);
				break;

			case 'message_sent':
				// Confirmation that message was sent
				break;

			case 'rename_success':
				chatUserInfo.update((info) => ({
					...info,
					username: data.newName
				}));
				console.log('Rename successful:', data.newName);
				break;

			case 'auth_success':
				// Update user info after successful authentication
				chatUserInfo.set({
					username: data.username,
					userId: data.userId,
					isGuest: false,
					isModerator: data.isModerator || false,
					isSiteModerator: data.isSiteModerator || false,
					isStreamer: data.isStreamer || false,
					isAdmin: data.isAdmin || false,
					avatarUrl: data.avatarUrl || '',
					userColor: data.userColor || '#FFFFFF'
				});
				console.log('Authentication successful:', data.username);
				break;

			case 'error':
				console.error('Chat error:', data.error);
				// Optionally show error to user
				break;

			case 'mod_action_success':
				console.log('Moderation action successful:', data.action);
				break;

			case 'participants_list':
				participants.set(data.participants || []);
				console.log(`Participants in realm: ${data.count}`);
				break;

			case 'participant_joined':
				// Add new participant to the list
				participants.update((list) => {
					// Check if already in list (avoid duplicates)
					const exists = list.some((p) => p.userId === data.participant.userId);
					if (!exists) {
						return [...list, data.participant];
					}
					return list;
				});
				console.log(`Participant joined: ${data.participant.username} (${data.participantCount} total)`);
				break;

			case 'participant_left':
				// Remove participant from the list
				participants.update((list) => list.filter((p) => p.userId !== data.userId));
				console.log(`Participant left: ${data.username} (${data.participantCount} total)`);
				break;

			default:
				console.log('Unknown message type:', data.type);
		}

		// Call custom handlers
		this.messageHandlers.forEach((handler) => handler(data));
	}

	sendMessage(content, userColor = '#FFFFFF', selfDestructSeconds = 0) {
		if (!this.ws || this.ws.readyState !== WebSocket.OPEN) {
			console.error('WebSocket not connected');
			return false;
		}

		const message = {
			type: 'message',
			content,
			userColor
		};

		// Only include selfDestructSeconds if set (> 0)
		if (selfDestructSeconds > 0) {
			message.selfDestructSeconds = selfDestructSeconds;
		}

		this.ws.send(JSON.stringify(message));
		return true;
	}

	joinRealm(realmId) {
		if (!this.ws || this.ws.readyState !== WebSocket.OPEN) {
			console.error('WebSocket not connected');
			return false;
		}

		const message = {
			type: 'join',
			realmId
		};

		this.ws.send(JSON.stringify(message));
		this.realmId = realmId;
		currentRealmId.set(realmId);
		return true;
	}

	deleteMessage(messageId) {
		if (!this.ws || this.ws.readyState !== WebSocket.OPEN) {
			console.error('WebSocket not connected');
			return false;
		}

		const message = {
			type: 'mod_action',
			action: 'delete',
			messageId
		};

		this.ws.send(JSON.stringify(message));
		return true;
	}

	// Site-wide fingerprint ban (admins + site moderators only)
	uberbanUser(targetUserId, fingerprint = '', reason = '') {
		return this.sendModAction('uberban', targetUserId, reason, 0, fingerprint);
	}

	// Remove site-wide fingerprint ban
	unUberbanUser(fingerprint, reason = '') {
		return this.sendModAction('ununberban', '', reason, 0, fingerprint);
	}

	// Per-realm ban
	banUser(targetUserId, reason = '') {
		return this.sendModAction('ban', targetUserId, reason);
	}

	// Remove per-realm ban
	unbanUser(targetUserId, fingerprint = '') {
		return this.sendModAction('unban', targetUserId, '', 0, fingerprint);
	}

	// Kick (disconnect + 1 min rejoin block)
	kickUser(targetUserId, duration = 60, reason = '') {
		return this.sendModAction('kick', targetUserId, reason, duration);
	}

	// duration: 0 = permanent (default), >0 = temporary with auto-expire
	muteUser(targetUserId, duration = 0, reason = '') {
		return this.sendModAction('mute', targetUserId, reason, duration);
	}

	sendModAction(action, targetUserId, reason = '', duration = 0, fingerprint = '') {
		if (!this.ws || this.ws.readyState !== WebSocket.OPEN) {
			console.error('WebSocket not connected');
			return false;
		}

		const message = {
			type: 'mod_action',
			action,
			targetUserId,
			reason,
			duration
		};

		// Include fingerprint if provided (for uberban/unban)
		if (fingerprint) {
			message.fingerprint = fingerprint;
		}

		this.ws.send(JSON.stringify(message));
		return true;
	}

	getParticipants() {
		if (!this.ws || this.ws.readyState !== WebSocket.OPEN) {
			console.error('WebSocket not connected');
			return false;
		}

		const message = {
			type: 'get_participants'
		};

		this.ws.send(JSON.stringify(message));
		return true;
	}

	sendRename(newName) {
		if (!this.ws || this.ws.readyState !== WebSocket.OPEN) {
			console.error('WebSocket not connected');
			return false;
		}

		const message = {
			type: 'rename',
			newName
		};

		this.ws.send(JSON.stringify(message));
		return true;
	}

	onMessage(handler) {
		this.messageHandlers.push(handler);
		return () => {
			this.messageHandlers = this.messageHandlers.filter((h) => h !== handler);
		};
	}

	attemptReconnect() {
		if (this.reconnectAttempts >= this.maxReconnectAttempts) {
			console.error('Max reconnect attempts reached. Use manualReconnect() to try again.');
			connectionStatus.set('failed');

			// Schedule automatic reset of reconnect attempts after 60 seconds
			// This allows the system to try again later without user intervention
			if (this.reconnectResetTimer) {
				clearTimeout(this.reconnectResetTimer);
			}
			this.reconnectResetTimer = setTimeout(() => {
				console.log('Resetting reconnect attempts after timeout');
				this.reconnectAttempts = 0;
				if (this.realmId) {
					this.connect(this.realmId, this.token);
				}
			}, 60000); // Try again after 1 minute
			return;
		}

		this.reconnectAttempts++;
		// Cap the delay at maxReconnectDelay
		const delay = Math.min(
			this.reconnectDelay * Math.pow(2, this.reconnectAttempts - 1),
			this.maxReconnectDelay
		);

		console.log(`Attempting to reconnect in ${delay}ms (attempt ${this.reconnectAttempts}/${this.maxReconnectAttempts})`);

		setTimeout(() => {
			if (this.realmId) {
				this.connect(this.realmId, this.token);
			}
		}, delay);
	}

	/**
	 * Manually trigger reconnection - resets attempt counter and tries immediately
	 */
	manualReconnect() {
		console.log('Manual reconnect triggered');
		if (this.reconnectResetTimer) {
			clearTimeout(this.reconnectResetTimer);
			this.reconnectResetTimer = null;
		}
		this.reconnectAttempts = 0;
		if (this.realmId) {
			this.connect(this.realmId, this.token);
		}
	}

	disconnect() {
		// Clear any pending reconnect timers
		if (this.reconnectResetTimer) {
			clearTimeout(this.reconnectResetTimer);
			this.reconnectResetTimer = null;
		}
		if (this.ws) {
			this.ws.close();
			this.ws = null;
		}
		this.realmId = null;
		this.token = null;
		this.reconnectAttempts = 0;
		connectionStatus.set('disconnected');
	}
}

// Singleton instance
export const chatWebSocket = new ChatWebSocket();