#!/usr/bin/env node
/**
 * OpenClaw VOC Skills 一键部署脚本
 * 
 * 功能：将 skills 文件夹中的所有技能部署到 OpenClaw 的 skills 目录
 * 兼容：Windows / macOS / Linux
 * 依赖：仅需 Node.js（OpenClaw 已自带）
 * 
 * 使用方法：
 *   node install.js                    # 部署所有技能
 *   node install.js --list             # 仅列出技能，不部署
 *   node install.js --only a,b,c       # 仅部署指定技能
 *   node install.js --skip a,b,c       # 跳过指定技能
 *   node install.js --target /path     # 指定目标目录（默认 ~/.openclaw/skills）
 *   node install.js --clean            # 部署前清空目标目录
 *   node install.js --dry-run          # 预览模式，不实际写入
 */

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

// ============================================
// 配置
// ============================================
const VERSION = '1.0.0';
const SKILLS_SUBDIR = 'skills'; // zip 包内的技能目录名

// ============================================
// 参数解析
// ============================================
function parseArgs() {
    const args = process.argv.slice(2);
    const opts = {
        list: false,
        only: [],
        skip: [],
        target: '',
        clean: false,
        dryRun: false,
        help: false
    };

    for (let i = 0; i < args.length; i++) {
        switch (args[i]) {
            case '--list':
            case '-l':
                opts.list = true;
                break;
            case '--only':
                opts.only = (args[++i] || '').split(',').filter(Boolean);
                break;
            case '--skip':
                opts.skip = (args[++i] || '').split(',').filter(Boolean);
                break;
            case '--target':
            case '-t':
                opts.target = args[++i] || '';
                break;
            case '--clean':
                opts.clean = true;
                break;
            case '--dry-run':
                opts.dryRun = true;
                break;
            case '--help':
            case '-h':
                opts.help = true;
                break;
        }
    }

    return opts;
}

// ============================================
// 工具函数
// ============================================
function getOpenClawSkillsDir() {
    const home = os.homedir();
    return path.join(home, '.openclaw', 'skills');
}

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

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

function removeDir(dir) {
    if (fs.existsSync(dir)) {
        fs.rmSync(dir, { recursive: true, force: true });
    }
}

function getFileSize(filePath) {
    try {
        return fs.statSync(filePath).size;
    } catch {
        return 0;
    }
}

function formatSize(bytes) {
    if (bytes < 1024) return bytes + ' B';
    if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' KB';
    return (bytes / 1024 / 1024).toFixed(1) + ' MB';
}

// ============================================
// 核心逻辑
// ============================================
function discoverSkills(sourceDir) {
    if (!fs.existsSync(sourceDir)) {
        return [];
    }

    return fs.readdirSync(sourceDir)
        .filter(name => {
            const fullPath = path.join(sourceDir, name);
            return fs.statSync(fullPath).isDirectory()
                && fs.existsSync(path.join(fullPath, 'SKILL.md'));
        })
        .map(name => {
            const skillDir = path.join(sourceDir, name);
            const files = [];
            let totalSize = 0;

            for (const fileName of fs.readdirSync(skillDir)) {
                const filePath = path.join(skillDir, fileName);
                if (fs.statSync(filePath).isFile()) {
                    const size = getFileSize(filePath);
                    files.push({ name: fileName, path: filePath, size });
                    totalSize += size;
                }
            }

            return { name, dir: skillDir, files, totalSize };
        })
        .sort((a, b) => a.name.localeCompare(b.name));
}

function filterSkills(skills, opts) {
    let filtered = skills;

    if (opts.only.length > 0) {
        filtered = filtered.filter(s => opts.only.includes(s.name));
    }

    if (opts.skip.length > 0) {
        filtered = filtered.filter(s => !opts.skip.includes(s.name));
    }

    return filtered;
}

function showHelp() {
    console.log(`
OpenClaw VOC Skills Installer v${VERSION}

Usage:
  node install.js [options]

Options:
  --list, -l          List available skills without installing
  --only a,b,c        Install only specified skills
  --skip a,b,c        Skip specified skills
  --target, -t PATH   Custom target directory (default: ~/.openclaw/skills)
  --clean             Remove existing skills before installing
  --dry-run           Preview what would be installed
  --help, -h          Show this help

Examples:
  node install.js                               # Install all skills
  node install.js --list                         # List skills
  node install.js --only tiktok-video-search     # Install one skill
  node install.js --skip test-billing,test-skill # Skip test skills
  node install.js --target ./my-skills           # Custom directory
`);
}

function listSkills(skills) {
    console.log(`\n  Found ${skills.length} skills:\n`);

    let totalSize = 0;
    let totalFiles = 0;

    for (const skill of skills) {
        const fileNames = skill.files.map(f => f.name).join(', ');
        console.log(`  ${skill.name.padEnd(35)} ${formatSize(skill.totalSize).padStart(8)}   [${fileNames}]`);
        totalSize += skill.totalSize;
        totalFiles += skill.files.length;
    }

    console.log(`\n  Total: ${skills.length} skills, ${totalFiles} files, ${formatSize(totalSize)}\n`);
}

function installSkills(skills, targetDir, opts) {
    const prefix = opts.dryRun ? '[DRY-RUN] ' : '';

    console.log(`\n${prefix}Installing ${skills.length} skills to:`);
    console.log(`  ${targetDir}\n`);

    if (opts.clean && !opts.dryRun) {
        console.log(`${prefix}Cleaning target directory...`);
        for (const skill of skills) {
            const dest = path.join(targetDir, skill.name);
            if (fs.existsSync(dest)) {
                removeDir(dest);
            }
        }
    }

    let installed = 0;
    let skipped = 0;
    let errors = 0;

    for (const skill of skills) {
        const destDir = path.join(targetDir, skill.name);

        try {
            if (!opts.dryRun) {
                ensureDir(destDir);
            }

            for (const file of skill.files) {
                const destFile = path.join(destDir, file.name);
                
                // Check if file already exists and is identical
                if (fs.existsSync(destFile)) {
                    const existingContent = fs.readFileSync(destFile);
                    const newContent = fs.readFileSync(file.path);
                    if (existingContent.equals(newContent)) {
                        skipped++;
                        continue;
                    }
                }

                if (!opts.dryRun) {
                    copyFileSync(file.path, destFile);
                }
                installed++;
            }

            process.stdout.write(`  ✅ ${skill.name}\n`);
        } catch (err) {
            process.stdout.write(`  ❌ ${skill.name}: ${err.message}\n`);
            errors++;
        }
    }

    console.log(`\n${'─'.repeat(50)}`);
    console.log(`${prefix}Done!`);
    console.log(`  Installed: ${installed} files`);
    console.log(`  Unchanged: ${skipped} files`);
    if (errors > 0) console.log(`  Errors:    ${errors}`);
    console.log(`  Target:    ${targetDir}`);
    console.log('');

    if (!opts.dryRun && errors === 0) {
        console.log('  Skills are ready. Restart OpenClaw gateway to load them.');
        console.log('');
    }
}

// ============================================
// 主入口
// ============================================
function main() {
    const opts = parseArgs();

    if (opts.help) {
        showHelp();
        return;
    }

    console.log('');
    console.log('  ╔══════════════════════════════════════════════╗');
    console.log(`  ║   OpenClaw VOC Skills Installer  v${VERSION}     ║`);
    console.log('  ╚══════════════════════════════════════════════╝');

    // Determine source directory (skills/ next to this script)
    const scriptDir = __dirname;
    const sourceDir = path.join(scriptDir, SKILLS_SUBDIR);

    if (!fs.existsSync(sourceDir)) {
        console.error(`\n  ❌ Skills directory not found: ${sourceDir}`);
        console.error('  Make sure the "skills" folder is in the same directory as this script.\n');
        process.exit(1);
    }

    // Discover skills
    const allSkills = discoverSkills(sourceDir);

    if (allSkills.length === 0) {
        console.error(`\n  ❌ No skills found in: ${sourceDir}\n`);
        process.exit(1);
    }

    // Filter
    const skills = filterSkills(allSkills, opts);

    if (opts.list) {
        listSkills(skills);
        return;
    }

    if (skills.length === 0) {
        console.log('\n  No skills matched the filter.\n');
        return;
    }

    // Target directory
    const targetDir = opts.target || getOpenClawSkillsDir();

    // Pre-flight check
    const openclawDir = path.join(os.homedir(), '.openclaw');
    if (!opts.target && !fs.existsSync(openclawDir)) {
        console.error(`\n  ⚠️  OpenClaw directory not found: ${openclawDir}`);
        console.error('  Is OpenClaw installed? You can specify a custom target with --target PATH\n');
        process.exit(1);
    }

    listSkills(skills);
    installSkills(skills, targetDir, opts);
}

main();