#!/usr/bin/env node

const fs = require('fs');
const path = require('path');
const { exec } = require('child_process');
const { promisify } = require('util');

const execAsync = promisify(exec);

// Configuration
const WATCH_DIRS = ['components', 'app', 'lib', 'styles'];
const WATCH_EXTENSIONS = ['.tsx', '.ts', '.js', '.jsx', '.css', '.scss', '.json'];
const COMMIT_DELAY = 30000; // 30 seconds delay before auto-commit
const MAX_COMMITS_PER_HOUR = 10;

class AutoCommitWatcher {
    constructor() {
        this.commitQueue = new Set();
        this.commitTimeout = null;
        this.commitsThisHour = 0;
        this.lastCommitTime = 0;
        this.startTime = new Date();
        
        // Reset commit counter every hour
        setInterval(() => {
            this.commitsThisHour = 0;
            console.log('🔄 Hourly reset: Commit counter reset to 0');
        }, 3600000);
        
        // Log startup info
        console.log('🚀 Timeshift Auto-Commit Watcher Started');
        console.log('==========================================');
        console.log(`📅 Start time: ${this.startTime.toISOString()}`);
        console.log(`📁 Watching directories: ${WATCH_DIRS.join(', ')}`);
        console.log(`📄 File extensions: ${WATCH_EXTENSIONS.join(', ')}`);
        console.log(`⏱️  Commit delay: ${COMMIT_DELAY/1000}s`);
        console.log(`🚦 Max commits per hour: ${MAX_COMMITS_PER_HOUR}`);
        console.log(`🔧 Process ID: ${process.pid}`);
        console.log('==========================================');
    }
    
    start() {
        WATCH_DIRS.forEach(dir => {
            const fullPath = path.join(process.cwd(), dir);
            if (fs.existsSync(fullPath)) {
                this.watchDirectory(fullPath);
                console.log(`👀 Watching: ${fullPath}`);
            } else {
                console.log(`⚠️  Directory not found: ${fullPath}`);
            }
        });
    }
    
    watchDirectory(dirPath) {
        try {
            fs.watch(dirPath, { recursive: true }, (eventType, filename) => {
                if (!filename) return;
                
                const filePath = path.join(dirPath, filename);
                const ext = path.extname(filename);
                
                // Check if file extension is in our watch list
                if (WATCH_EXTENSIONS.includes(ext)) {
                    this.handleFileChange(filePath, eventType);
                }
            });
        } catch (error) {
            console.error(`❌ Error watching directory ${dirPath}:`, error.message);
        }
    }
    
    handleFileChange(filePath, eventType) {
        const relativePath = path.relative(process.cwd(), filePath);
        console.log(`📝 File changed: ${relativePath} (${eventType})`);
        
        // Add to commit queue
        this.commitQueue.add(relativePath);
        
        // Clear existing timeout and set new one
        if (this.commitTimeout) {
            clearTimeout(this.commitTimeout);
        }
        
        this.commitTimeout = setTimeout(() => {
            this.performAutoCommit();
        }, COMMIT_DELAY);
    }
    
    async performAutoCommit() {
        // Rate limiting
        if (this.commitsThisHour >= MAX_COMMITS_PER_HOUR) {
            console.log(`⏸️  Rate limit reached (${MAX_COMMITS_PER_HOUR} commits/hour). Skipping auto-commit.`);
            this.commitQueue.clear();
            return;
        }
        
        // Check if enough time has passed since last commit
        const now = Date.now();
        if (now - this.lastCommitTime < COMMIT_DELAY) {
            console.log('⏸️  Too soon since last commit. Skipping.');
            return;
        }
        
        if (this.commitQueue.size === 0) {
            console.log('📋 No files in commit queue');
            return;
        }
        
        try {
            // Check if there are actually changes to commit
            const { stdout: status } = await execAsync('git status --porcelain');
            if (!status.trim()) {
                console.log('📝 No actual changes to commit');
                this.commitQueue.clear();
                return;
            }
            
            console.log('🔄 Performing auto-commit...');
            
            // Create commit message with changed files
            const changedFiles = Array.from(this.commitQueue).slice(0, 5); // Limit to 5 files in message
            const fileList = changedFiles.join(', ');
            const moreFiles = this.commitQueue.size > 5 ? ` and ${this.commitQueue.size - 5} more` : '';
            
            const message = `Auto-save: Updated ${fileList}${moreFiles}`;
            
            // Use our auto-commit script
            await execAsync(`./auto-commit.sh commit "${message}"`);
            
            console.log('✅ Auto-commit successful');
            this.commitsThisHour++;
            this.lastCommitTime = now;
            this.commitQueue.clear();
            
        } catch (error) {
            console.error('❌ Auto-commit failed:', error.message);
        }
    }
    
    async createRestorePoint(description = 'Auto restore point') {
        try {
            console.log('🔖 Creating restore point...');
            await execAsync(`./auto-commit.sh restore-point "${description}"`);
            console.log('✅ Restore point created');
        } catch (error) {
            console.error('❌ Failed to create restore point:', error.message);
        }
    }
}

// Handle process termination gracefully
process.on('SIGINT', async () => {
    console.log('\n🛑 Stopping auto-commit watcher...');
    
    // Perform final commit if there are pending changes
    try {
        const { stdout: status } = await execAsync('git status --porcelain');
        if (status.trim()) {
            console.log('💾 Saving final changes...');
            await execAsync('./auto-commit.sh commit "Final auto-save before shutdown"');
        }
    } catch (error) {
        console.error('❌ Error during shutdown save:', error.message);
    }
    
    console.log('👋 Auto-commit watcher stopped');
    process.exit(0);
});

// Start the watcher
const watcher = new AutoCommitWatcher();
watcher.start();

// Create restore point on startup
setTimeout(() => {
    watcher.createRestorePoint('Session start');
}, 5000);

// Create periodic restore points (every 30 minutes)
setInterval(() => {
    watcher.createRestorePoint('Periodic backup');
}, 30 * 60 * 1000);

console.log('🚀 Auto-commit system ready! Press Ctrl+C to stop.');
console.log('📋 Commands available:');
console.log('  ./auto-commit.sh commit [message]');
console.log('  ./auto-commit.sh restore-point [description]');
console.log('  ./auto-commit.sh list');
console.log('  ./auto-commit.sh cleanup');