#!/usr/bin/env node
/**
 * User lookup using a dedicated minimal-permissions bot
 * 
 * This bot:
 * - Has NO server permissions
 * - Only needs to be in the server
 * - Uses separate token from main bot
 * - Won't affect your main bot's rate limits
 * 
 * Usage:
 *   LOOKUP_BOT_TOKEN=your_token node scripts/lookup-with-dedicated-bot.js <input_file> <output_file>
 */

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

// Load environment
require('dotenv').config({ path: path.join(__dirname, '../../.env') });

// Use dedicated bot token OR fall back to main bot
const TOKEN = process.env.MEMBER_BOT_TOKEN || process.env.LOOKUP_BOT_TOKEN || process.env.DISCORD_BOT_TOKEN;

if (!TOKEN) {
    console.error('❌ Error: No bot token found');
    console.error('   Set MEMBER_BOT_TOKEN in .env or use DISCORD_BOT_TOKEN');
    process.exit(1);
}

const args = process.argv.slice(2);
if (args.length < 2) {
    console.error('Usage: node scripts/lookup-with-dedicated-bot.js <input_file> <output_file>');
    process.exit(1);
}

const inputFile = args[0];
const outputFile = args[1];

// Read user IDs
const userIds = fs.readFileSync(inputFile, 'utf-8')
    .split('\n')
    .map(line => line.trim())
    .filter(line => line.length > 0);

console.log(`✅ Loaded ${userIds.length} user IDs`);

// Load existing results
let results = {};
let processed = 0;
let errors = 0;

if (fs.existsSync(outputFile)) {
    try {
        const existing = JSON.parse(fs.readFileSync(outputFile, 'utf-8'));
        results = existing.users || {};
        processed = Object.keys(results).length;
        errors = existing.errors || 0;
        console.log(`📂 Found existing: ${processed} users`);
    } catch (e) {
        console.log(`⚠️  Starting fresh`);
    }
}

// Create bot with MINIMAL intents
const client = new Client({
    intents: [
        GatewayIntentBits.Guilds  // Only need this to stay in server
        // NO other intents needed!
    ]
});

async function lookupUser(userId) {
    if (results[userId]) return results[userId];
    
    try {
        const user = await client.users.fetch(userId);
        return {
            success: true,
            id: user.id,
            username: user.username,
            globalName: user.globalName || user.username,
            tag: user.tag,
            bot: user.bot,
            avatar: user.displayAvatarURL()
        };
    } catch (error) {
        return {
            success: false,
            id: userId,
            error: error.message,
            username: null,
            globalName: null,
            tag: null,
            bot: false
        };
    }
}

function saveResults() {
    const output = {
        timestamp: new Date().toISOString(),
        total_users: userIds.length,
        processed: processed,
        successful: processed - errors,
        errors: errors,
        bot_type: (process.env.MEMBER_BOT_TOKEN || process.env.LOOKUP_BOT_TOKEN) ? 'dedicated' : 'main',
        users: results
    };
    
    fs.writeFileSync(outputFile, JSON.stringify(output, null, 2));
}

async function processUsers() {
    console.log('\n🚀 Starting lookups...');
    const isDedicated = !!(process.env.MEMBER_BOT_TOKEN || process.env.LOOKUP_BOT_TOKEN);
    console.log(`   Bot type: ${isDedicated ? '✅ Dedicated lookup bot' : '⚠️  Main bot'}`);
    console.log(`   Rate: SLOW (1 user/second for safety)`);
    console.log();
    
    const startTime = Date.now();
    const toProcess = userIds.filter(id => !results[id]);
    console.log(`   ${toProcess.length} users remaining\n`);
    
    for (let i = 0; i < toProcess.length; i++) {
        const userId = toProcess[i];
        
        const result = await lookupUser(userId);
        results[result.id] = result;
        
        if (!result.success) errors++;
        processed++;
        
        // Save every 10 users for frequent updates
        if (processed % 10 === 0) {
            saveResults();
            const elapsed = (Date.now() - startTime) / 1000;
            const rate = (processed - (userIds.length - toProcess.length)) / elapsed;
            const remaining = (toProcess.length - i - 1) / rate;
            console.log(`💾 ${processed}/${userIds.length} (${errors} errors) - saved - ~${remaining.toFixed(0)}s left`);
        }
        
        // Very slow to avoid rate limits (1/second)
        await new Promise(resolve => setTimeout(resolve, 1000));
    }
    
    saveResults();
    
    const totalTime = (Date.now() - startTime) / 1000;
    console.log(`\n${'='.repeat(60)}`);
    console.log(`✅ Complete!`);
    console.log(`${'='.repeat(60)}`);
    console.log(`   Time: ${totalTime.toFixed(1)}s`);
    console.log(`   Processed: ${processed}/${userIds.length}`);
    console.log(`   Successful: ${processed - errors}`);
    console.log(`   Errors: ${errors}`);
    console.log(`\n💾 Saved to: ${outputFile}\n`);
    
    process.exit(0);
}

client.once('ready', () => {
    const isDedicated = !!(process.env.MEMBER_BOT_TOKEN || process.env.LOOKUP_BOT_TOKEN);
    const botType = isDedicated ? 'DEDICATED LOOKUP BOT' : 'Main Bot';
    console.log(`✅ Logged in as ${client.user.tag}`);
    console.log(`   Type: ${botType}`);
    console.log();
    processUsers();
});

client.on('error', (error) => {
    console.error('❌ Error:', error.message);
});

process.on('SIGINT', () => {
    console.log('\n\n⚠️  Interrupted! Saving...');
    saveResults();
    console.log('✅ Saved. Resume by running same command.\n');
    process.exit(0);
});

console.log('🔌 Connecting to Discord...');
client.login(TOKEN);