/// <reference types="bun-types" />
import { CommandService } from './services/command';
import { GroupSyncService } from './services/group-sync';
import { ResponseQueue } from './services/response-queue';
import { WebhookManager } from './services/webhook-manager';
import { normalizeWhatsAppId } from './utils/whatsapp';

// Bun is available globally when running under Bun runtime
declare global {
	var Bun: typeof import('bun');
}

export const REQUIRED_ENV = [
	'EVOLUTION_API_URL',
	'EVOLUTION_API_KEY', 
	'EVOLUTION_API_INSTANCE',
	'CHATBOT_PHONE_NUMBER',
	'WEBHOOK_URL'
];

type WebhookPayload = {
	event: string;
	instance: string;
	data: any;
	// Other fields from Evolution API
};

export class WebhookServer {
	private static getBaseUrl(request: Request): string {
		const proto = request.headers.get('x-forwarded-proto') || 'http';
		const host = request.headers.get('x-forwarded-host') || request.headers.get('host');
		return `${proto}://${host}`;
	}

	static async handleRequest(request: Request): Promise<Response> {
		// Health check endpoint
		const url = new URL(request.url);
		if (url.pathname.endsWith('/health')) {
			return new Response('OK', { status: 200 });
		}

		if (process.env.NODE_ENV !== 'test') {
			console.log('ℹ️ Incoming webhook request:')
		}

		// 1. Method validation
		if (request.method !== 'POST') {
			return new Response('🚫 Method not allowed', { status: 405 });
		}

		// 2. Content-Type validation
		const contentType = request.headers.get('content-type');
		if (!contentType?.includes('application/json')) {
			return new Response('🚫 Invalid content type', { status: 400 });
		}

		try {
			// 3. Parse and validate payload
			const payload = await request.json() as WebhookPayload;

			if (!payload.event || !payload.instance) {
				return new Response('🚫 Invalid payload', { status: 400 });
			}

			// 4. Verify instance matches (skip in test environment unless TEST_VERIFY_INSTANCE is set)
			if ((process.env.NODE_ENV !== 'test' || process.env.TEST_VERIFY_INSTANCE) &&
				payload.instance !== process.env.EVOLUTION_API_INSTANCE) {
				return new Response('🚫 Invalid instance', { status: 403 });
			}

			// 5. Route events
			// console.log('ℹ️ Webhook event received:', {
			// 	event: payload.event,
			// 	instance: payload.instance,
			// 	data: payload.data ? '[...]' : null
			// });

			switch (payload.event) {
				case 'messages.upsert':
					if (process.env.NODE_ENV !== 'test') {
						console.log('ℹ️ Handling message upsert:', {
							groupId: payload.data?.key?.remoteJid,
							message: payload.data?.message?.conversation
						});
					}
					await WebhookServer.handleMessageUpsert(payload.data);
					break;
				// Other events will be added later
			}

			return new Response('OK', { status: 200 });
		} catch (error) {
			console.error('❌ Error processing webhook:', {
				error: error instanceof Error ? error.message : String(error),
				stack: error instanceof Error ? error.stack : undefined,
				time: new Date().toISOString()
			});
			return new Response('Invalid request', { status: 400 });
		}
	}

	static async handleMessageUpsert(data: any) {
		if (!data?.key?.remoteJid || !data.message || !data.message.conversation) {
			if (process.env.NODE_ENV !== 'test') {
				console.log('⚠️ Invalid message format - missing required fields');
				console.log(data);
			}
			return;
		}

		// Normalize sender ID for consistency and validation
		const normalizedSenderId = normalizeWhatsAppId(data.key.participant);
		if (!normalizedSenderId) {
			if (process.env.NODE_ENV !== 'test') {
				console.log('⚠️ Invalid sender ID, ignoring message');
			}
			return;
		}

		// Forward to command service only if:
		// 1. It's a text message (has conversation field)
		// 2. Starts with /tarea command
		const messageText = data.message.conversation;
		if (typeof messageText === 'string' && messageText.trim().startsWith('/tarea')) {
			// Parse command components
			const commandParts = messageText.trim().split(/\s+/);
			const command = commandParts[0].toLowerCase();

			if (commandParts.length < 2) {
				console.log('⚠️ Invalid /tarea command - missing action');
				return;
			}

			const action = commandParts[1].toLowerCase();
			let descriptionParts = [];
			let dueDate = '';

			// Process remaining parts
			const dateCandidates = [];
			
			// First collect all valid future dates
			for (let i = 2; i < commandParts.length; i++) {
				const part = commandParts[i];
				// Check for date (YYYY-MM-DD)
				if (/^\d{4}-\d{2}-\d{2}$/.test(part)) {
					const date = new Date(part);
					const today = new Date();
					today.setHours(0, 0, 0, 0);

					if (date >= today) {
						dateCandidates.push({ index: i, date, part });
					}
				}
			}
			
			// Use the last valid future date as due date
			if (dateCandidates.length > 0) {
				const lastDate = dateCandidates[dateCandidates.length - 1];
				dueDate = lastDate.part;
				
				// Add all parts except the last date to description
				for (let i = 2; i < commandParts.length; i++) {
					// Skip the due date part
					if (i === lastDate.index) continue;
					
					// Add to description if it's a date candidate but not selected or a regular part
					const part = commandParts[i];
					descriptionParts.push(part);
				}
			} else {
				// No valid future dates, add all parts to description
				descriptionParts = commandParts.slice(2);
			}

			const description = descriptionParts.join(' ').trim();

			console.log('🔍 Detected /tarea command:', {
				timestamp: new Date().toISOString(),
				from: data.key.participant,
				group: data.key.remoteJid,
				rawMessage: messageText
			});

			const mentions = data.message?.contextInfo?.mentionedJid || [];
			console.log('✅ Successfully parsed command:', {
				action,
				description,
				dueDate: dueDate || 'none',
				mentionCount: mentions.length
			});

			const responses = await CommandService.handle({
				sender: data.key.participant,
				groupId: data.key.remoteJid,
				message: messageText,
				mentions
			});

			// Queue responses for sending
			await ResponseQueue.add(responses);
		}
	}

	static validateEnv() {
		console.log('ℹ️ Checking environment variables...');
		console.log('EVOLUTION_API_URL:', process.env.EVOLUTION_API_URL ? '***' : 'MISSING');
		console.log('EVOLUTION_API_INSTANCE:', process.env.EVOLUTION_API_INSTANCE || 'MISSING');
		console.log('WEBHOOK_URL:', process.env.WEBHOOK_URL ? `${process.env.WEBHOOK_URL.substring(0, 20)}...` : 'MISSING');
		console.log('WHATSAPP_COMMUNITY_ID:', process.env.WHATSAPP_COMMUNITY_ID ? '***' : 'NOT SET (se mostrarán comunidades disponibles)');

		const missing = REQUIRED_ENV.filter(v => !process.env[v]);
		if (missing.length) {
			console.error('❌ Missing required environment variables:');
			missing.forEach(v => console.error(`- ${v}`));
			console.error('Add these to your CapRover environment configuration');
			process.exit(1);
		}

		if (process.env.CHATBOT_PHONE_NUMBER &&
			!/^\d+$/.test(process.env.CHATBOT_PHONE_NUMBER)) {
			console.error('❌ CHATBOT_PHONE_NUMBER must contain only digits');
			process.exit(1);
		}
	}

	static async start() {
		this.validateEnv();

		const PORT = process.env.PORT || '3007';
		console.log('✅ Environment variables validated');

		if (process.env.NODE_ENV !== 'test') {
			try {
				await WebhookManager.registerWebhook();
				// Add small delay to allow webhook to propagate
				await new Promise(resolve => setTimeout(resolve, 1000));
				const isActive = await WebhookManager.verifyWebhook();
				if (!isActive) {
					console.error('❌ Webhook verification failed - retrying in 2 seconds...');
					await new Promise(resolve => setTimeout(resolve, 2000));
					const isActiveRetry = await WebhookManager.verifyWebhook();
					if (!isActiveRetry) {
						console.error('❌ Webhook verification failed after retry');
						process.exit(1);
					}
				}

				// Initialize groups - critical for operation
				await GroupSyncService.checkInitialGroups();
			} catch (error) {
				console.error('❌ Failed to setup webhook:', error instanceof Error ? error.message : error);
				process.exit(1);
			}
		}

		const server = Bun.serve({
			port: parseInt(PORT),
			fetch: (request) => WebhookServer.handleRequest(request)
		});
		console.log(`Server running on port ${PORT}`);
		return server;
	}
}