// src/services/NotificationService.js
const express = require('express');
const { createMatchRequestEmbed } = require('../utils/embedBuilders');
const { createMatchActionRow } = require('../utils/componentBuilders');

class NotificationService {
    constructor(bot, supabase) {
        this.bot = bot;
        this.supabase = supabase;
        this.app = express();
        this.app.use(express.json());
        this.setupRoutes();
    }

    setupRoutes() {
        this.app.post('/api/match-notification', this.handleMatchNotification.bind(this));
    }

    async start(port = 3000) {
        return new Promise((resolve, reject) => {
            try {
                this.server = this.app.listen(port, () => {
                    console.log(`Notification service listening on port ${port}`);
                    resolve();
                });
                
                this.server.on('error', (error) => {
                    if (error.code === 'EADDRINUSE') {
                        console.log(`Port ${port} is in use, trying port ${port + 1}`);
                        this.start(port + 1).then(resolve).catch(reject);
                    } else {
                        reject(error);
                    }
                });
            } catch (error) {
                reject(error);
            }
        });
    }

    async stop() {
        if (this.server) {
            return new Promise((resolve) => {
                this.server.close(resolve);
            });
        }
    }

    async handleMatchNotification(req, res) {
        try {
            const authToken = req.headers['x-webhook-token'];
            if (authToken !== process.env.WEBHOOK_SECRET) {
                return res.status(401).json({ error: 'Unauthorized' });
            }

            const matchData = req.body;
            if (!this.validateMatchData(matchData)) {
                return res.status(400).json({ error: 'Invalid match data' });
            }

            matchData.match_date = `${matchData.match_date}T${matchData.match_time}Z`;

            const { data: subscriptions, error } = await this.supabase
                .from('active_subscriptions')
                .select('*')
                .eq('game_name', matchData.game_name);

            if (error) {
                console.error('Error fetching subscriptions:', error);
                return res.status(500).json({ error: 'Failed to fetch subscriptions' });
            }

            const results = [];
            for (const subscription of (subscriptions || [])) {
                try {
                    const channel = await this.bot.client.channels.fetch(subscription.notification_channel_id);
                    
                    // Check if bot has permissions to send messages in this channel
                    if (!channel.permissionsFor(this.bot.client.user).has(['SendMessages', 'ViewChannel'])) {
                        console.warn(`Missing permissions for channel ${subscription.notification_channel_id} in server ${channel.guild.name}`);
                        results.push({
                            channelId: subscription.notification_channel_id,
                            status: 'failed',
                            error: 'Missing permissions'
                        });
                        continue;
                    }

                    const embed = createMatchRequestEmbed(matchData);
                    const actionRow = createMatchActionRow(matchData.game_name);

                    await channel.send({ 
                        embeds: [embed],
                        components: [actionRow]
                    });

                    results.push({
                        channelId: subscription.notification_channel_id,
                        status: 'success'
                    });

                } catch (error) {
                    console.error(`Error sending notification to channel ${subscription.notification_channel_id}:`, error);
                    results.push({
                        channelId: subscription.notification_channel_id,
                        status: 'failed',
                        error: error.message
                    });
                }
            }

            res.json({ 
                success: true, 
                results,
                summary: {
                    total: results.length,
                    successful: results.filter(r => r.status === 'success').length,
                    failed: results.filter(r => r.status === 'failed').length
                }
            });

        } catch (error) {
            console.error('Error handling match notification:', error);
            res.status(500).json({ error: 'Internal server error' });
        }
    }

    validateMatchData(matchData) {
        const requiredFields = [
            'type',
            'game_name',
            'game_id',
            'created_by_user_id',
            'status',
            'team_size',
            'match_type',
            'region',
            'match_date',
            'match_time',
            'match_class'
        ];

        // Check if all required fields are present
        const hasAllFields = requiredFields.every(field => {
            const hasField = matchData.hasOwnProperty(field) && matchData[field] !== null && matchData[field] !== undefined;
            if (!hasField) {
                console.log(`Missing or null field: ${field}`);
            }
            return hasField;
        });

        if (!hasAllFields) {
            return false;
        }

        // Validate team size format (should be a number or string containing a number)
        const teamSize = matchData.team_size.toString().replace(/[^0-9]/g, '');
        if (!teamSize || isNaN(teamSize) || teamSize < 1) {
            console.log('Invalid team size format');
            return false;
        }

        return true;
    }
}

module.exports = NotificationService;