# -*- coding: utf-8 -*-
"""
Python Django 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_django_project(backend_dir, project_name):
    """初始化 Django 项目"""
    print("\n🚀 初始化 Django 项目...")
    
    # 创建虚拟环境
    success = run_command_with_progress(
        f'"{sys.executable}" -m venv venv',
        backend_dir,
        "创建 Python 虚拟环境"
    )
    
    if not success:
        print("\n⚠️  虚拟环境创建失败，请检查 Python 安装")
        return
    
    venv_python = backend_dir / "venv" / "Scripts" / "python.exe"
    venv_pip = backend_dir / "venv" / "Scripts" / "pip.exe"
    
    if not venv_python.exists():
        print("\n⚠️  虚拟环境创建失败")
        return
    
    # 安装 Django 和 CORS 支持
    run_command_with_progress(
        f'"{venv_pip}" install django django-cors-headers',
        backend_dir,
        "安装 Django 依赖"
    )
    
    # 使用 django-admin 创建项目
    django_admin = backend_dir / "venv" / "Scripts" / "django-admin.exe"
    run_command_with_progress(
        f'"{django_admin}" startproject config .',
        backend_dir,
        "创建 Django 项目"
    )
    
    # 创建 api 应用
    run_command_with_progress(
        f'"{venv_python}" manage.py startapp api',
        backend_dir,
        "创建 api 应用"
    )
    
    # 创建 requirements.txt
    requirements = backend_dir / "requirements.txt"
    requirements.write_text('''Django==5.0.0
django-cors-headers==4.3.0
''', encoding='utf-8')
    
    # 修改 settings.py 添加 CORS 和 api 应用
    settings_file = backend_dir / "config" / "settings.py"
    if settings_file.exists():
        settings_content = settings_file.read_text(encoding='utf-8')
        
        # 添加 INSTALLED_APPS
        settings_content = settings_content.replace(
            "INSTALLED_APPS = [",
            """INSTALLED_APPS = [
    'corsheaders',
    'api',"""
        )
        
        # 添加 MIDDLEWARE
        settings_content = settings_content.replace(
            "MIDDLEWARE = [",
            """MIDDLEWARE = [
    'corsheaders.middleware.CorsMiddleware',"""
        )
        
        # 添加 CORS 配置
        settings_content += """

# CORS 配置
CORS_ALLOW_ALL_ORIGINS = True

# 允许的请求头
CORS_ALLOW_HEADERS = [
    'accept',
    'accept-encoding',
    'authorization',
    'content-type',
    'dnt',
    'origin',
    'user-agent',
    'x-csrftoken',
    'x-requested-with',
]
"""
        settings_file.write_text(settings_content, encoding='utf-8')
    
    # 创建 api/views.py
    api_views = backend_dir / "api" / "views.py"
    api_views.write_text(f'''from django.http import JsonResponse


def health(request):
    """健康检查接口"""
    return JsonResponse({{
        'status': 'ok',
        'message': 'Welcome to {project_name} API'
    }})


def hello(request):
    """示例接口"""
    return JsonResponse({{
        'message': 'Hello from Django!'
    }})
''', encoding='utf-8')
    
    # 创建 api/urls.py
    api_urls = backend_dir / "api" / "urls.py"
    api_urls.write_text('''from django.urls import path
from . import views

urlpatterns = [
    path('health', views.health, name='health'),
    path('hello', views.hello, name='hello'),
]
''', encoding='utf-8')
    
    # 修改主 urls.py
    main_urls = backend_dir / "config" / "urls.py"
    main_urls.write_text('''from django.contrib import admin
from django.urls import path, include

urlpatterns = [
    path('admin/', admin.site.urls),
    path('api/', include('api.urls')),
]
''', encoding='utf-8')
    
    # 创建启动脚本 run.py
    run_py = backend_dir / "run.py"
    run_py.write_text('''#!/usr/bin/env python
import os
import sys

if __name__ == "__main__":
    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "config.settings")
    print("🚀 服务器启动: http://localhost:8080")
    print("📍 健康检查: http://localhost:8080/api/health")
    print("🔧 管理后台: http://localhost:8080/admin/")
    
    from django.core.management import execute_from_command_line
    execute_from_command_line(["manage.py", "runserver", "0.0.0.0:8080"])
''', encoding='utf-8')
    
    print("\n✅ Django 项目初始化成功")
    print("💡 启动命令: venv\\Scripts\\python run.py")
    print("🔧 管理后台: http://localhost:8080/admin/")
    print("📝 提示: 首次运行前执行 venv\\Scripts\\python manage.py migrate")