/**
 *  MSI Builder Script - สร้างไฟล์ติดตั้ง Windows
 *  Chahua Development Thailand
 *  CEO: Saharath C.
 * 
 *  Purpose: สร้าง Windows Installer (.msi) สำหรับ deployment
 */

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

class MSIBuilder {
    constructor() {
        this.config = {
            productName: 'Chahuadev Framework',
            productVersion: '1.0.0',
            manufacturer: 'Chahua Development Thailand',
            description: 'Universal Execution Framework by CEO Saharath C.',
            outputDir: './chahuadev-framework/build',
            tempDir: './chahuadev-framework/build/temp',
            //  Logo and Icon Configuration
            iconConfig: {
                iconFile: 'icon.png',
                logoFile: 'logo.png',
                splashIcon: 'splash.html'
            }
        };
        
        console.log(' MSI Builder initialized');
        console.log(' Logo system enabled');
    }

    async buildMSI() {
        try {
            console.log(' Starting MSI build process...');
            
            // Step 1: Prepare build directory
            await this.prepareBuildDirectory();
            
            // Step 2: Copy application files
            await this.copyApplicationFiles();
            
            // Step 3: Generate WiX configuration
            await this.generateWiXConfig();
            
            // Step 4: Build MSI (requires WiX Toolset)
            await this.compileMSI();
            
            console.log(' MSI build completed successfully!');
            
        } catch (error) {
            console.error(' MSI build failed:', error.message);
            throw error;
        }
    }

    async prepareBuildDirectory() {
        console.log(' Preparing build directories...');
        
        // Create directories
        const dirs = [
            this.config.outputDir,
            this.config.tempDir,
            path.join(this.config.tempDir, 'app'),
            path.join(this.config.tempDir, 'resources')
        ];
        
        for (const dir of dirs) {
            if (!fs.existsSync(dir)) {
                fs.mkdirSync(dir, { recursive: true });
            }
        }
    }

    async copyApplicationFiles() {
        console.log(' Copying application files...');
        
        const filesToCopy = [
            'main.js',
            'preload.js',
            'index.html',
            'splash.html',
            'validation_gateway.js',
            'package.json',
            //  Logo and Assets (Essential for Splash Screen)
            'icon.png',
            'logo.png',
            'logo.ico',
            //  Additional logo formats (optional)
            'logo.svg',
            'app-icon.png',
            'app-icon.ico',
            //  User Guides
            'USER_GUIDE_TH.md',
            'USER_GUIDE_EN.md',
            'modules/',
            'strategies/',
            'plugins/',
            'config/'
        ];
        
        // แก้ไขเส้นทางให้ถูกต้อง - ใช้ root directory แทน subdirectory
        const sourceBase = '.'; // ใช้ current directory
        const destBase = path.join(this.config.tempDir, 'app');
        
        for (const file of filesToCopy) {
            const sourcePath = path.join(sourceBase, file);
            const destPath = path.join(destBase, file);
            
            if (fs.existsSync(sourcePath)) {
                this.copyRecursive(sourcePath, destPath);
                console.log(`    Copied: ${file}`);
            } else if (file.includes('.png') || file.includes('.ico')) {
                console.log(`    Logo file missing: ${file} - will use fallback`);
            }
        }
        
        //  Copy logo to resources directory
        await this.copyLogoAssets();
    }

    copyRecursive(src, dest) {
        const stat = fs.statSync(src);
        
        if (stat.isDirectory()) {
            if (!fs.existsSync(dest)) {
                fs.mkdirSync(dest, { recursive: true });
            }
            
            const files = fs.readdirSync(src);
            for (const file of files) {
                this.copyRecursive(
                    path.join(src, file),
                    path.join(dest, file)
                );
            }
        } else {
            fs.copyFileSync(src, dest);
        }
    }

    //  NEW METHOD: Copy logo assets for installer
    async copyLogoAssets() {
        console.log(' Copying logo assets...');
        
        const resourcesDir = path.join(this.config.tempDir, 'resources');
        const logoAssets = [
            { src: 'icon.png', dest: 'app-icon.png' },
            { src: 'logo.png', dest: 'logo.png' },
            { src: 'logo.ico', dest: 'app-icon.ico' }
        ];
        
        for (const asset of logoAssets) {
            // แก้ไขเส้นทาง source ให้ถูกต้อง
            const srcPath = path.join('.', asset.src); // ใช้ current directory
            const destPath = path.join(resourcesDir, asset.dest);
            
            if (fs.existsSync(srcPath)) {
                fs.copyFileSync(srcPath, destPath);
                console.log(`    Logo copied: ${asset.src}  ${asset.dest}`);
            } else {
                // Create a simple fallback icon
                await this.createFallbackIcon(destPath, asset.dest);
            }
        }
    }

    //  NEW METHOD: Create fallback logo if original missing
    async createFallbackIcon(destPath, filename) {
        if (filename.endsWith('.png')) {
            // Create a simple SVG-based PNG fallback (text representation)
            const fallbackContent = `<!-- Chahuadev Framework Logo Fallback -->\n<svg width="128" height="128" xmlns="http://www.w3.org/2000/svg">\n  <rect width="128" height="128" fill="#1a1a2e" rx="18"/>\n  <text x="64" y="75" font-family="Arial" font-size="48" font-weight="bold" text-anchor="middle" fill="#00ff88">C</text>\n</svg>`;
            fs.writeFileSync(destPath.replace('.png', '.svg'), fallbackContent);
            console.log(`    Created fallback logo: ${filename}`);
        }
    }

    async generateWiXConfig() {
        console.log(' Generating WiX configuration...');
        
        const wixConfig = `<?xml version="1.0" encoding="UTF-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
  <Product Id="*" 
           Name="${this.config.productName}" 
           Language="1033" 
           Version="${this.config.productVersion}" 
           Manufacturer="${this.config.manufacturer}" 
           UpgradeCode="12345678-1234-1234-1234-123456789012">
    
    <Package InstallerVersion="200" 
             Compressed="yes" 
             InstallScope="perMachine" 
             Description="${this.config.description}" />

    <MajorUpgrade DowngradeErrorMessage="A newer version is already installed." />
    <MediaTemplate EmbedCab="yes" />

    <!--  Icon Configuration -->
    <Icon Id="ProductIcon" SourceFile="$(var.SourceDir)\\resources\\app-icon.ico" />
    <Property Id="ARPPRODUCTICON" Value="ProductIcon" />

    <Feature Id="ProductFeature" Title="Chahuadev Framework" Level="1">
      <ComponentGroupRef Id="ProductComponents" />
      <ComponentGroupRef Id="LogoComponents" />
      <ComponentGroupRef Id="UserGuideComponents" />
    </Feature>
  </Product>

  <Fragment>
    <Directory Id="TARGETDIR" Name="SourceDir">
      <Directory Id="ProgramFilesFolder">
        <Directory Id="INSTALLFOLDER" Name="Chahuadev Framework" />
      </Directory>
    </Directory>
  </Fragment>

  <Fragment>
    <ComponentGroup Id="ProductComponents" Directory="INSTALLFOLDER">
      <Component Id="MainExecutable" Guid="*">
        <File Id="main.js" Source="$(var.SourceDir)\\app\\main.js" KeyPath="yes" />
        <File Id="app.js" Source="$(var.SourceDir)\\app\\app.js" />
        <File Id="cli.js" Source="$(var.SourceDir)\\app\\cli.js" />
        <File Id="package.json" Source="$(var.SourceDir)\\app\\package.json" />
        <File Id="index.html" Source="$(var.SourceDir)\\app\\index.html" />
        <File Id="splash.html" Source="$(var.SourceDir)\\app\\splash.html" />
      </Component>
    </ComponentGroup>
    
    <!--  Logo Components -->
    <ComponentGroup Id="LogoComponents" Directory="INSTALLFOLDER">
      <Component Id="LogoAssets" Guid="*">
        <File Id="icon.png" Source="$(var.SourceDir)\\app\\icon.png" />
        <File Id="logo.png" Source="$(var.SourceDir)\\app\\logo.png" />
      </Component>
    </ComponentGroup>
    
    <!--  User Guide Components -->
    <ComponentGroup Id="UserGuideComponents" Directory="INSTALLFOLDER">
      <Component Id="UserGuides" Guid="*">
        <File Id="USER_GUIDE_TH.md" Source="$(var.SourceDir)\\app\\USER_GUIDE_TH.md" />
        <File Id="USER_GUIDE_EN.md" Source="$(var.SourceDir)\\app\\USER_GUIDE_EN.md" />
      </Component>
    </ComponentGroup>
  </Fragment>
</Wix>`;

        const wixPath = path.join(this.config.tempDir, 'chahuadev.wxs');
        fs.writeFileSync(wixPath, wixConfig);
        
        console.log('    WiX configuration generated');
        console.log('    Logo integration included');
    }

    async compileMSI() {
        console.log(' Compiling MSI package...');
        
        return new Promise((resolve, reject) => {
            // Check if WiX Toolset is available
            exec('candle -?', (error) => {
                if (error) {
                    console.warn(' WiX Toolset not found. Installing npm packages instead...');
                    this.createPortablePackage();
                    resolve();
                    return;
                }
                
                // Compile with WiX
                const wixPath = path.join(this.config.tempDir, 'chahuadev.wxs');
                const objPath = path.join(this.config.tempDir, 'chahuadev.wixobj');
                const msiPath = path.join(this.config.outputDir, 'ChahuadevFramework.msi');
                
                // Candle (compile)
                exec(`candle "${wixPath}" -out "${objPath}"`, (error) => {
                    if (error) {
                        reject(new Error(`Candle compilation failed: ${error.message}`));
                        return;
                    }
                    
                    // Light (link)
                    exec(`light "${objPath}" -out "${msiPath}"`, (error) => {
                        if (error) {
                            reject(new Error(`Light linking failed: ${error.message}`));
                            return;
                        }
                        
                        console.log(`    MSI created: ${msiPath}`);
                        resolve();
                    });
                });
            });
        });
    }

    createPortablePackage() {
        console.log(' Creating portable package instead...');
        
        const packageInfo = {
            name: this.config.productName,
            version: this.config.productVersion,
            description: this.config.description,
            author: this.config.manufacturer,
            instructions: [
                '1. Extract this package to desired location',
                '2. Run: npm install',
                '3. Start: node app.js',
                '4. CLI: node cli.js --help',
                '5. For user instructions, see USER_GUIDE_TH.md (Thai) or USER_GUIDE_EN.md (English)'
            ],
            requirements: [
                'Node.js v16.0.0 or higher',
                'npm v7.0.0 or higher'
            ],
            userGuides: [
                'USER_GUIDE_TH.md - Thai language user manual',
                'USER_GUIDE_EN.md - English language user manual'
            ]
        };
        
        const readmePath = path.join(this.config.outputDir, 'INSTALLATION.md');
        const readme = `# ${packageInfo.name} v${packageInfo.version}

${packageInfo.description}

## Requirements
${packageInfo.requirements.map(req => `- ${req}`).join('\n')}

## Installation Instructions
${packageInfo.instructions.map((step, i) => `${i + 1}. ${step}`).join('\n')}

## User Guides
${packageInfo.userGuides.map(guide => `- ${guide}`).join('\n')}

## Support
For support, contact: ${packageInfo.author}
`;

        fs.writeFileSync(readmePath, readme);
        fs.writeFileSync(
            path.join(this.config.outputDir, 'package-info.json'),
            JSON.stringify(packageInfo, null, 2)
        );
        
        console.log('    Portable package created');
    }

    async clean() {
        console.log(' Cleaning temporary files...');
        
        if (fs.existsSync(this.config.tempDir)) {
            fs.rmSync(this.config.tempDir, { recursive: true, force: true });
        }
        
        console.log('    Cleanup completed');
    }
}

// CLI Usage
if (require.main === module) {
    const builder = new MSIBuilder();
    
    builder.buildMSI()
        .then(() => builder.clean())
        .catch((error) => {
            console.error('Build failed:', error);
            process.exit(1);
        });
}

module.exports = MSIBuilder;