# -*- coding: utf-8 -*-
"""
JavaScript Express.js 后端项目初始化模块
"""

import subprocess
import sys


def run_command_with_progress(cmd, cwd, description):
    """运行命令并显示实时输出"""
    try:
        print(f"\n{'=' * 60}")
        print(f"执行: {description}")
        print(f"{'=' * 60}")
        
        process = subprocess.Popen(
            cmd,
            cwd=cwd,
            shell=True,
            stdout=subprocess.PIPE,
            stderr=subprocess.STDOUT,
            bufsize=0
        )
        
        for line in process.stdout:
            try:
                decoded_line = line.decode('utf-8', errors='replace')
            except:
                try:
                    decoded_line = line.decode('gbk', errors='replace')
                except:
                    decoded_line = line.decode('latin-1', errors='replace')
            print(decoded_line, end='')
        
        process.wait()
        
        if process.returncode == 0:
            print(f"\n{'=' * 60}")
            print(f"✅ {description} - 完成")
            print(f"{'=' * 60}\n")
            return True
        else:
            print(f"\n{'=' * 60}")
            print(f"❌ {description} - 失败 (错误码: {process.returncode})")
            print(f"{'=' * 60}\n")
            return False
            
    except Exception as e:
        print(f"\n❌ 执行失败: {str(e)}")
        return False


def init_express_project(backend_dir, project_name):
    """初始化 Express.js 项目"""
    print("\n🚀 初始化 Express.js 项目...")
    
    # 初始化 npm 项目
    success = run_command_with_progress(
        "npm init -y",
        backend_dir,
        "初始化 npm 项目"
    )
    
    if not success:
        print("\n💡 提示: 请确保已安装 Node.js 和 npm")
        print("   下载地址: https://nodejs.org/")
        sys.exit(1)
    
    # 安装依赖
    run_command_with_progress(
        "npm install express cors",
        backend_dir,
        "安装 Express.js 依赖"
    )
    
    # 安装开发依赖
    run_command_with_progress(
        "npm install -D nodemon",
        backend_dir,
        "安装开发依赖 (nodemon)"
    )
    
    # 创建 app.js
    app_js = backend_dir / "app.js"
    app_js.write_text(f'''const express = require('express');
const cors = require('cors');

const app = express();
const PORT = 8080;

// 中间件
app.use(cors());
app.use(express.json());

// 健康检查接口
app.get('/api/health', (req, res) => {{
    res.json({{
        status: 'ok',
        message: 'Welcome to {project_name} API'
    }});
}});

// 示例接口
app.get('/api/hello', (req, res) => {{
    res.json({{ message: 'Hello from Express.js!' }});
}});

// 启动服务器
app.listen(PORT, () => {{
    console.log('🚀 服务器启动: http://localhost:' + PORT);
    console.log('📍 健康检查: http://localhost:' + PORT + '/api/health');
}});
''', encoding='utf-8')
    
    # 更新 package.json 添加脚本
    package_json = backend_dir / "package.json"
    import json
    pkg = json.loads(package_json.read_text(encoding='utf-8'))
    pkg['scripts'] = {
        'start': 'node app.js',
        'dev': 'nodemon app.js'
    }
    pkg['name'] = f'{project_name}-backend'
    package_json.write_text(json.dumps(pkg, indent=2, ensure_ascii=False), encoding='utf-8')
    
    print("\n✅ Express.js 项目初始化成功")
    print("💡 启动命令: npm run dev (开发模式) 或 npm start (生产模式)")