/**
 *  Copy User Guides Script
 * 
 * สคริปต์สำหรับคัดลอกไฟล์คู่มือการใช้งานจาก build_assets/plugins 
 * ไปยังโฟลเดอร์รากของโปรเจค เพื่อรวมในแพ็คเกจขั้นสุดท้าย
 */

const fs = require('fs');
const path = require('path');

class UserGuidesCopier {
    constructor() {
        this.projectRoot = path.resolve(__dirname, '..');
        this.sourceDir = path.join(this.projectRoot, 'build_assets', 'plugins');
        this.destinationDir = this.projectRoot;
        
        this.guidesToCopy = [
            {
                name: 'USER_GUIDE_EN.md',
                description: 'English User Guide'
            },
            {
                name: 'USER_GUIDE_TH.md', 
                description: 'Thai User Guide (คู่มือภาษาไทย)'
            }
        ];
    }

    /**
     * เริ่มกระบวนการคัดลอกไฟล์คู่มือ
     */
    async copyUserGuides() {
        console.log(' Starting User Guides Copy Process...');
        console.log('='.repeat(50));
        
        try {
            let successCount = 0;
            let failCount = 0;
            
            for (const guide of this.guidesToCopy) {
                const result = await this.copyGuide(guide);
                if (result) {
                    successCount++;
                } else {
                    failCount++;
                }
            }
            
            console.log('\n' + '='.repeat(50));
            console.log(' Copy Summary:');
            console.log(`   Successfully copied: ${successCount} files`);
            console.log(`   Failed to copy: ${failCount} files`);
            
            if (successCount > 0) {
                console.log('\n User guides are now ready for distribution!');
                console.log(' These files will be included in your built application.');
            }
            
            if (failCount > 0) {
                console.log('\n  Some files could not be copied. Please check the errors above.');
                process.exit(1);
            }
            
        } catch (error) {
            console.error(' Copy process failed:', error.message);
            process.exit(1);
        }
    }

    /**
     * คัดลอกไฟล์คู่มือแต่ละไฟล์
     */
    async copyGuide(guide) {
        const sourcePath = path.join(this.sourceDir, guide.name);
        const destPath = path.join(this.destinationDir, guide.name);
        
        console.log(`\n Processing: ${guide.description}`);
        console.log(`   Source: ${path.relative(this.projectRoot, sourcePath)}`);
        console.log(`   Destination: ${path.relative(this.projectRoot, destPath)}`);
        
        try {
            // ตรวจสอบว่าไฟล์ต้นทางมีอยู่หรือไม่
            if (!fs.existsSync(sourcePath)) {
                console.log(`    Source file not found: ${guide.name}`);
                return false;
            }
            
            // ตรวจสอบขนาดไฟล์
            const stats = fs.statSync(sourcePath);
            console.log(`    File size: ${this.formatFileSize(stats.size)}`);
            
            // คัดลอกไฟล์
            fs.copyFileSync(sourcePath, destPath);
            
            // ตรวจสอบว่าคัดลอกสำเร็จ
            if (fs.existsSync(destPath)) {
                const destStats = fs.statSync(destPath);
                if (stats.size === destStats.size) {
                    console.log(`    Successfully copied: ${guide.name}`);
                    return true;
                } else {
                    console.log(`    File size mismatch after copy: ${guide.name}`);
                    return false;
                }
            } else {
                console.log(`    Destination file not created: ${guide.name}`);
                return false;
            }
            
        } catch (error) {
            console.log(`    Error copying ${guide.name}: ${error.message}`);
            return false;
        }
    }

    /**
     * แปลงขนาดไฟล์เป็นรูปแบบที่อ่านง่าย
     */
    formatFileSize(bytes) {
        const units = ['B', 'KB', 'MB', 'GB'];
        let size = bytes;
        let unitIndex = 0;
        
        while (size >= 1024 && unitIndex < units.length - 1) {
            size /= 1024;
            unitIndex++;
        }
        
        return `${size.toFixed(1)} ${units[unitIndex]}`;
    }

    /**
     * ตรวจสอบสถานะไฟล์คู่มือ
     */
    async checkStatus() {
        console.log(' Checking User Guides Status...');
        console.log('='.repeat(50));
        
        for (const guide of this.guidesToCopy) {
            const sourcePath = path.join(this.sourceDir, guide.name);
            const destPath = path.join(this.destinationDir, guide.name);
            
            console.log(`\n ${guide.description}:`);
            
            // ตรวจสอบไฟล์ต้นทาง
            if (fs.existsSync(sourcePath)) {
                const sourceStats = fs.statSync(sourcePath);
                console.log(`    Source:  (${this.formatFileSize(sourceStats.size)})`);
            } else {
                console.log(`    Source:  Not found`);
            }
            
            // ตรวจสอบไฟล์ปลายทาง
            if (fs.existsSync(destPath)) {
                const destStats = fs.statSync(destPath);
                console.log(`    Destination:  (${this.formatFileSize(destStats.size)})`);
            } else {
                console.log(`    Destination:  Not found`);
            }
        }
    }
}

// รองรับการใช้งานผ่าน command line
if (require.main === module) {
    const copier = new UserGuidesCopier();
    
    // ตรวจสอบ command line arguments
    const args = process.argv.slice(2);
    
    if (args.includes('--status') || args.includes('-s')) {
        copier.checkStatus().catch(console.error);
    } else if (args.includes('--help') || args.includes('-h')) {
        console.log(' User Guides Copier');
        console.log('');
        console.log('Usage:');
        console.log('  node scripts/copy-user-guides.js          Copy user guides');
        console.log('  node scripts/copy-user-guides.js --status Check current status');
        console.log('  node scripts/copy-user-guides.js --help   Show this help');
        console.log('');
        console.log('This script copies user guide files from build_assets/plugins/');
        console.log('to the project root for inclusion in the final build package.');
    } else {
        copier.copyUserGuides().catch(console.error);
    }
}

module.exports = UserGuidesCopier;