#!/usr/bin/env node
/**
 * HexaHost.de Build Script
 * 
 * Obfusciert JavaScript und minifiziert CSS für die Produktion
 * 
 * Verwendung:
 *   npm run build          - Alles bauen
 *   npm run build:js       - Nur JavaScript
 *   npm run build:css      - Nur CSS
 */

const fs = require('fs');
const path = require('path');
const JavaScriptObfuscator = require('javascript-obfuscator');
const CleanCSS = require('clean-css');

// Konfiguration
const config = {
    srcDir: path.join(__dirname, '..'),
    distDir: path.join(__dirname, '..', 'dist'),
    
    // JavaScript-Dateien zum Obfuscieren
    jsFiles: [
        'assets/js/main.js',
        'assets/js/contact.js',
        'assets/js/cookie-consent.js'
    ],
    
    // CSS-Dateien zum Minifizieren
    cssFiles: [
        'assets/css/style.css'
    ],
    
    // PHP-Dateien (nur kopieren)
    phpFiles: [
        'config/config.php',
        'config/mail-config.php',
        'config/products-config.php',
        'includes/header.php',
        'includes/footer.php',
        'includes/functions.php'
    ],
    
    // JavaScript Obfuscator Optionen
    jsObfuscatorOptions: {
        compact: true,
        controlFlowFlattening: true,
        controlFlowFlatteningThreshold: 0.7,
        deadCodeInjection: true,
        deadCodeInjectionThreshold: 0.4,
        debugProtection: false,
        disableConsoleOutput: true,
        identifierNamesGenerator: 'hexadecimal',
        log: false,
        numbersToExpressions: true,
        renameGlobals: false,
        selfDefending: true,
        simplify: true,
        splitStrings: true,
        splitStringsChunkLength: 10,
        stringArray: true,
        stringArrayCallsTransform: true,
        stringArrayEncoding: ['base64'],
        stringArrayIndexShift: true,
        stringArrayRotate: true,
        stringArrayShuffle: true,
        stringArrayWrappersCount: 2,
        stringArrayWrappersChainedCalls: true,
        stringArrayWrappersParametersMaxCount: 4,
        stringArrayWrappersType: 'function',
        stringArrayThreshold: 0.75,
        transformObjectKeys: true,
        unicodeEscapeSequence: false
    },
    
    // Clean-CSS Optionen
    cssMinifyOptions: {
        level: {
            1: {
                specialComments: 0
            },
            2: {
                mergeMedia: true,
                removeEmpty: true,
                removeDuplicateFontRules: true,
                removeDuplicateMediaBlocks: true,
                removeDuplicateRules: true
            }
        }
    }
};

// Hilfsfunktionen
function ensureDir(dir) {
    if (!fs.existsSync(dir)) {
        fs.mkdirSync(dir, { recursive: true });
    }
}

function copyFile(src, dest) {
    ensureDir(path.dirname(dest));
    fs.copyFileSync(src, dest);
}

function formatBytes(bytes) {
    if (bytes === 0) return '0 Bytes';
    const k = 1024;
    const sizes = ['Bytes', 'KB', 'MB'];
    const i = Math.floor(Math.log(bytes) / Math.log(k));
    return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
}

function getCompressionRatio(original, compressed) {
    return ((1 - compressed / original) * 100).toFixed(1);
}

// JavaScript obfuscieren
function obfuscateJS(filePath) {
    const srcPath = path.join(config.srcDir, filePath);
    const destPath = path.join(config.distDir, filePath);
    
    if (!fs.existsSync(srcPath)) {
        console.log(`  ⚠️  Datei nicht gefunden: ${filePath}`);
        return null;
    }
    
    const originalCode = fs.readFileSync(srcPath, 'utf8');
    const originalSize = Buffer.byteLength(originalCode, 'utf8');
    
    try {
        const obfuscatedCode = JavaScriptObfuscator.obfuscate(
            originalCode,
            config.jsObfuscatorOptions
        ).getObfuscatedCode();
        
        const obfuscatedSize = Buffer.byteLength(obfuscatedCode, 'utf8');
        
        ensureDir(path.dirname(destPath));
        fs.writeFileSync(destPath, obfuscatedCode);
        
        return {
            file: filePath,
            originalSize,
            newSize: obfuscatedSize,
            ratio: getCompressionRatio(originalSize, obfuscatedSize)
        };
    } catch (error) {
        console.log(`  ❌ Fehler bei ${filePath}: ${error.message}`);
        return null;
    }
}

// CSS minifizieren
function minifyCSS(filePath) {
    const srcPath = path.join(config.srcDir, filePath);
    const destPath = path.join(config.distDir, filePath);
    
    if (!fs.existsSync(srcPath)) {
        console.log(`  ⚠️  Datei nicht gefunden: ${filePath}`);
        return null;
    }
    
    const originalCode = fs.readFileSync(srcPath, 'utf8');
    const originalSize = Buffer.byteLength(originalCode, 'utf8');
    
    try {
        const minified = new CleanCSS(config.cssMinifyOptions).minify(originalCode);
        
        if (minified.errors.length > 0) {
            console.log(`  ❌ Fehler bei ${filePath}: ${minified.errors.join(', ')}`);
            return null;
        }
        
        const minifiedSize = Buffer.byteLength(minified.styles, 'utf8');
        
        ensureDir(path.dirname(destPath));
        fs.writeFileSync(destPath, minified.styles);
        
        return {
            file: filePath,
            originalSize,
            newSize: minifiedSize,
            ratio: getCompressionRatio(originalSize, minifiedSize)
        };
    } catch (error) {
        console.log(`  ❌ Fehler bei ${filePath}: ${error.message}`);
        return null;
    }
}

// PHP-Dateien kopieren (keine Obfuscation)
function copyPHP(filePath) {
    const srcPath = path.join(config.srcDir, filePath);
    const destPath = path.join(config.distDir, filePath);
    
    if (!fs.existsSync(srcPath)) {
        console.log(`  ⚠️  Datei nicht gefunden: ${filePath}`);
        return null;
    }
    
    try {
        copyFile(srcPath, destPath);
        const size = fs.statSync(srcPath).size;
        
        return {
            file: filePath,
            originalSize: size,
            newSize: size,
            ratio: '0'
        };
    } catch (error) {
        console.log(`  ❌ Fehler bei ${filePath}: ${error.message}`);
        return null;
    }
}

// Hauptfunktion
function build() {
    const args = process.argv.slice(2);
    const jsOnly = args.includes('--js-only');
    const cssOnly = args.includes('--css-only');
    
    console.log('\n╔════════════════════════════════════════════════════════════╗');
    console.log('║           HexaHost.de - Build System                       ║');
    console.log('║           Obfuscation & Minification                       ║');
    console.log('╚════════════════════════════════════════════════════════════╝\n');
    
    // dist-Verzeichnis erstellen/leeren
    if (fs.existsSync(config.distDir)) {
        fs.rmSync(config.distDir, { recursive: true });
    }
    ensureDir(config.distDir);
    
    const results = [];
    
    // JavaScript obfuscieren
    if (!cssOnly) {
        console.log('📦 JavaScript obfuscieren...\n');
        config.jsFiles.forEach(file => {
            process.stdout.write(`  → ${file}... `);
            const result = obfuscateJS(file);
            if (result) {
                console.log(`✓ (${formatBytes(result.originalSize)} → ${formatBytes(result.newSize)}, -${result.ratio}%)`);
                results.push(result);
            }
        });
        console.log();
    }
    
    // CSS minifizieren
    if (!jsOnly) {
        console.log('🎨 CSS minifizieren...\n');
        config.cssFiles.forEach(file => {
            process.stdout.write(`  → ${file}... `);
            const result = minifyCSS(file);
            if (result) {
                console.log(`✓ (${formatBytes(result.originalSize)} → ${formatBytes(result.newSize)}, -${result.ratio}%)`);
                results.push(result);
            }
        });
        console.log();
    }
    
    // PHP-Dateien kopieren
    if (!jsOnly && !cssOnly) {
        console.log('📄 PHP-Dateien kopieren...\n');
        config.phpFiles.forEach(file => {
            process.stdout.write(`  → ${file}... `);
            const result = copyPHP(file);
            if (result) {
                console.log(`✓ (${formatBytes(result.originalSize)})`);
                results.push(result);
            }
        });
        console.log();
    }
    
    // Zusammenfassung
    const totalOriginal = results.reduce((sum, r) => sum + r.originalSize, 0);
    const totalNew = results.reduce((sum, r) => sum + r.newSize, 0);
    
    console.log('═══════════════════════════════════════════════════════════════');
    console.log(`✅ Build abgeschlossen!`);
    console.log(`   Dateien: ${results.length}`);
    console.log(`   Original: ${formatBytes(totalOriginal)}`);
    console.log(`   Optimiert: ${formatBytes(totalNew)}`);
    console.log(`   Ersparnis: ${formatBytes(totalOriginal - totalNew)} (${getCompressionRatio(totalOriginal, totalNew)}%)`);
    console.log(`   Ausgabe: ${config.distDir}`);
    console.log('═══════════════════════════════════════════════════════════════\n');
}

// Build starten
build();