package common

import (
	"fmt"
	"os"
	"path/filepath"
	"reflect"
	"regexp"
	"strings"

	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/net/ghttp"
	"github.com/gogf/gf/v2/os/gtime"
)

var Httpserver = g.Server()

func init() {
	err := gtime.SetTimeZone("Asia/Shanghai")
	if err != nil {
		panic("设置时区失败")
	}
	Httpserver.SetOpenApiPath("/api.json")
	Httpserver.BindMiddlewareDefault(ghttp.MiddlewareHandlerResponse)
	Httpserver.BindMiddlewareDefault(func(r *ghttp.Request) {
		r.Response.CORS(r.Response.DefaultCORSOptions())
		r.Middleware.Next()
	})
}

// RouteRegister 根据控制器结构体名称自动注册路由
func RouteRegister(controllers []interface{}) {
	re := regexp.MustCompile("[A-Z]")
	for _, t := range controllers {
		sName := reflect.ValueOf(t).Elem().Type().Name()
		convertedStr := re.ReplaceAllStringFunc(sName, func(s string) string {
			return fmt.Sprintf("-%s", strings.ToLower(s))
		})
		if len(convertedStr) > 0 && convertedStr[0] == '-' {
			convertedStr = convertedStr[1:]
		}
		Httpserver.Group("/"+convertedStr, func(group *ghttp.RouterGroup) {
			group.Bind(t)
		})
	}
}

// ServeFrontend 配置前端静态文件服务
func ServeFrontend(distDir string) {
	absDir, err := filepath.Abs(distDir)
	if err != nil {
		g.Log().Fatalf(nil, "前端目录路径无效: %v", err)
	}

	// 静态资源（JS/CSS/图片）
	Httpserver.AddStaticPath("/assets", absDir+"/assets")

	// SPA 兜底：非API路由返回 index.html
	Httpserver.BindHandler("/*", func(r *ghttp.Request) {
		indexFile := filepath.Join(absDir, "index.html")
		if fileExists(indexFile) {
			r.Response.ServeFile(indexFile)
		} else {
			r.Response.WriteStatus(404)
		}
	})
}

func fileExists(path string) bool {
	_, err := os.Stat(path)
	return err == nil
}