require('dotenv').config();

// Fix for Node 18+ IPv6 DNS resolution bug in Docker
const dns = require('node:dns');
dns.setDefaultResultOrder('ipv4first');

const {
    Client,
    GatewayIntentBits,
    Partials,
} = require('discord.js');

// ── Validate Environment ──────────────────────────────────────
const required = ['BOT_TOKEN', 'OWNER_ID'];
console.log('  📋  ENV CHECK:', required.map(k => `${k}=${process.env[k] ? '✅' : '❌'}`).join(' | '));
for (const key of required) {
    if (!process.env[key] || process.env[key].includes('YOUR_')) {
        console.error(`❌ Missing or placeholder env var: ${key}`);
        console.error('   Please fill in your .env file before starting.');
        process.exit(1);
    }
}

// ── Create Client ─────────────────────────────────────────────
const client = new Client({
    intents: [
        GatewayIntentBits.Guilds,
        GatewayIntentBits.GuildMembers,
        GatewayIntentBits.GuildMessages,
        GatewayIntentBits.GuildMessageReactions,
        GatewayIntentBits.DirectMessages,
        GatewayIntentBits.MessageContent,
        GatewayIntentBits.GuildPresences,
    ],
    partials: [
        Partials.Message,
        Partials.Channel,
        Partials.Reaction,
        Partials.User,
        Partials.GuildMember,
    ],
});

// ── Load Event Handlers ───────────────────────────────────────
const events = [
    require('./events/ready'),
    require('./events/messageCreate'),
    require('./events/messageReactionAdd'),
    require('./events/messageReactionRemove'),
    require('./events/guildMemberUpdate'),
    require('./events/guildMemberAdd'),
    require('./events/guildMemberRemove'),
    require('./events/interactionCreate'),
];

for (const event of events) {
    if (event.once) {
        client.once(event.name, (...args) => event.execute(client, ...args));
    } else {
        client.on(event.name, (...args) => event.execute(client, ...args));
    }
}

// ── Error Handling ────────────────────────────────────────────
client.on('error', (err) => {
    console.error('[Client Error]', err);
});

process.on('unhandledRejection', (err) => {
    console.error('[Unhandled Rejection]', err);
});

process.on('uncaughtException', (err) => {
    console.error('[Uncaught Exception]', err);
    process.exit(1);
});

// ── Keep-Alive HTTP Server (for Render / Glitch + UptimeRobot) ─
const http = require('http');
const PORT = process.env.PORT || 3001;

http.createServer((req, res) => {
    res.writeHead(200, { 'Content-Type': 'application/json' });
    res.end(JSON.stringify({
        status: 'alive',
        bot: client.user?.tag || 'starting...',
        uptime: Math.floor(process.uptime()) + 's',
    }));
}).listen(PORT, () => {
    console.log(`  🌐  Keep-alive server on port ${PORT}`);
});

// ── Login ─────────────────────────────────────────────────────
const token = process.env.BOT_TOKEN;
console.log(`  🔑  Token: ${token ? token.slice(0, 10) + '...' + token.slice(-5) : 'MISSING'}`);

async function startBot(retryCount = 0) {
    if (retryCount > 10) {
        console.error('❌ MAX RETRIES REACHED. Bot failed to connect.');
        process.exit(1);
    }

    console.log(`  ⏳  Connecting to Discord... (Attempt ${retryCount + 1})`);
    
    const loginTimeout = setTimeout(() => {
        console.error('❌ LOGIN TIMED OUT after 60s — Discord gateway unreachable');
    }, 60000);

    try {
        await client.login(token);
        clearTimeout(loginTimeout);
        console.log('  ✅  Login promise resolved');
    } catch (err) {
        clearTimeout(loginTimeout);
        console.error(`❌ LOGIN FAILED: ${err.message}`);
        
        if (err.message.includes('ENOTFOUND') || err.message.includes('EAI_AGAIN')) {
            console.log('  📡  DNS/Network error detected. Retrying in 10s...');
            setTimeout(() => startBot(retryCount + 1), 10000);
        } else {
            console.error('  ⚠️  Non-network error. Exiting.');
            process.exit(1);
        }
    }
}

// Debug logging for network issues
client.on('debug', (info) => {
    if (info.includes('Gateway')) console.log(`[DEBUG] ${info}`);
});

startBot();