# -*- coding: utf-8 -*-
"""
Go 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_golang_project(backend_dir, project_name):
    """初始化 Go 后端项目"""
    print("\n🚀 初始化 Go 后端项目...")
    
    # 初始化 Go 模块
    success = run_command_with_progress(
        f"go mod init {project_name}-backend",
        backend_dir,
        "初始化 Go 模块"
    )
    
    if not success:
        print("\n💡 提示: 请确保已安装 Go")
        print("   下载地址: https://golang.org/dl/")
        sys.exit(1)
    
    # 创建 main.go - 使用标准库
    main_go = backend_dir / "main.go"
    main_go.write_text(f'''package main

import (
	"encoding/json"
	"log"
	"net/http"
)

func main() {{
	mux := http.NewServeMux()

	// 健康检查接口
	mux.HandleFunc("GET /api/health", healthHandler)

	// 添加 CORS 中间件
	handler := corsMiddleware(mux)

	log.Println("🚀 服务器启动: http://localhost:8080")
	log.Println("📍 健康检查: http://localhost:8080/api/health")
	log.Fatal(http.ListenAndServe(":8080", handler))
}}

func healthHandler(w http.ResponseWriter, r *http.Request) {{
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]string{{
		"status":  "ok",
		"message": "Welcome to {project_name} API",
	}})
}}

func corsMiddleware(next http.Handler) http.Handler {{
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {{
		w.Header().Set("Access-Control-Allow-Origin", "*")
		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
		w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")

		if r.Method == "OPTIONS" {{
			w.WriteHeader(http.StatusNoContent)
			return
		}}

		next.ServeHTTP(w, r)
	}})
}}
''', encoding='utf-8')
    
    # 整理依赖
    run_command_with_progress("go mod tidy", backend_dir, "整理 Go 依赖")
    
    print("\n✅ Go 后端项目初始化成功")
    print("💡 启动命令: go run main.go")
    print("📝 注意: 使用 Go 标准库，无需第三方依赖")


def init_gin_project(backend_dir, project_name):
    """初始化 Go Gin 后端项目"""
    print("\n🚀 初始化 Go Gin 后端项目...")

    # 初始化 Go 模块
    success = run_command_with_progress(
        f"go mod init {project_name}-backend",
        backend_dir,
        "初始化 Go 模块"
    )

    if not success:
        print("\n💡 提示: 请确保已安装 Go")
        print("   下载地址: https://golang.org/dl/")
        sys.exit(1)

    # 拉取 Gin 依赖
    deps_ok = run_command_with_progress(
        "go get github.com/gin-gonic/gin github.com/gin-contrib/cors",
        backend_dir,
        "安装 Gin 依赖"
    )

    if not deps_ok:
        print("\n❌ 无法安装 Gin 依赖，请检查 Go 环境和网络")
        sys.exit(1)

    # 创建 main.go - Gin 框架
    main_go = backend_dir / "main.go"
    main_go.write_text(f'''package main

import (
    "log"
    "time"

    "github.com/gin-contrib/cors"
    "github.com/gin-gonic/gin"
)

func main() {{
    r := gin.New()
    r.Use(gin.Logger())
    r.Use(gin.Recovery())

    // CORS 配置
    r.Use(cors.New(cors.Config{{
        AllowOrigins:     []string{{"*"}},
        AllowMethods:     []string{{"GET", "POST", "PUT", "DELETE", "OPTIONS"}},
        AllowHeaders:     []string{{"Origin", "Content-Type", "Authorization"}},
        ExposeHeaders:    []string{{"Content-Length"}},
        AllowCredentials: false,
        MaxAge:           12 * time.Hour,
    }}))

    // 健康检查
    r.GET("/api/health", func(c *gin.Context) {{
        c.JSON(200, gin.H{{
            "status":  "ok",
            "message": "Welcome to {project_name} API",
        }})
    }})

    addr := ":8080"
    log.Printf("🚀 Gin 服务启动: http://localhost%s", addr)
    log.Printf("📍 健康检查: http://localhost%s/api/health", addr)

    if err := r.Run(addr); err != nil {{
        log.Fatalf("启动失败: %v", err)
    }}
}}
''', encoding='utf-8')

    # 整理依赖
    run_command_with_progress("go mod tidy", backend_dir, "整理 Go 依赖")

    print("\n✅ Go Gin 后端项目初始化成功")
    print("💡 启动命令: go run main.go")