package main

import (
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
	"golang.org/x/crypto/bcrypt"
)

func SetupRouter() *gin.Engine {
	r := gin.Default()

	// 静态文件（前端）
	r.Static("/static", "./static")

	// API 路由
	api := r.Group("/api")
	{
		// 登录（无需鉴权）
		api.POST("/login", loginHandler)

		// 需要鉴权的路由
		auth := api.Group("/")
		auth.Use(AuthMiddleware())
		{
			// 全局配置
			auth.GET("/config", getConfigHandler)
			auth.PUT("/config", updateConfigHandler)

			// 隧道管理
			auth.GET("/proxies", getProxiesHandler)
			auth.GET("/proxy/:id", getProxyHandler)
			auth.POST("/proxy", createProxyHandler)
			auth.PUT("/proxy/:id", updateProxyHandler)
			auth.DELETE("/proxy/:id", deleteProxyHandler)

			// frpc 控制
			auth.POST("/frpc/reload", reloadFrpcHandler)
			auth.POST("/frpc/start", startFrpcHandler)
			auth.POST("/frpc/stop", stopFrpcHandler)
			auth.GET("/frpc/status", getFrpcStatusHandler)
		}
	}

	// 前端入口
	r.GET("/", func(c *gin.Context) {
		c.File("./static/index.html")
		c.String(200, "frpc-console 后端已启动 🚀")
	})

	return r
}

// ========== 登录 ==========
func loginHandler(c *gin.Context) {
	var req struct {
		Username string `json:"username"`
		Password string `json:"password"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"code": 1, "msg": "请求参数错误"})
		return
	}

	user, err := GetUserByUsername(req.Username)
	if err != nil {
		c.JSON(http.StatusUnauthorized, gin.H{"code": 1, "msg": "用户名或密码错误"})
		return
	}

	err = bcrypt.CompareHashAndPassword([]byte(user.PasswordHash), []byte(req.Password))
	if err != nil {
		c.JSON(http.StatusUnauthorized, gin.H{"code": 1, "msg": "用户名或密码错误"})
		return
	}

	token, err := GenerateJWT(user.Username)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "生成Token失败"})
		return
	}

	c.JSON(http.StatusOK, gin.H{"code": 0, "msg": "登录成功", "data": gin.H{"token": token}})
}

// ========== 全局配置 ==========
func getConfigHandler(c *gin.Context) {
	cfg, err := GetGlobalConfig()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "读取配置失败"})
		return
	}
	c.JSON(http.StatusOK, gin.H{"code": 0, "data": cfg})
}

func updateConfigHandler(c *gin.Context) {
	var cfg GlobalConfig
	if err := c.ShouldBindJSON(&cfg); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"code": 1, "msg": "请求参数错误"})
		return
	}

	if err := UpdateGlobalConfig(&cfg); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "更新配置失败"})
		return
	}

	// 自动生成配置文件并热加载
	if err := GenerateFrpcConfig(); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "生成配置文件失败: " + err.Error()})
		return
	}

	if err := ReloadFrpc(); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "热加载失败: " + err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"code": 0, "msg": "配置更新成功"})
}

// ========== 隧道管理 ==========
func getProxiesHandler(c *gin.Context) {
	proxies, err := GetProxies()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "读取隧道列表失败"})
		return
	}
	c.JSON(http.StatusOK, gin.H{"code": 0, "data": proxies})
}

func getProxyHandler(c *gin.Context) {
	id, _ := strconv.Atoi(c.Param("id"))
	p, err := GetProxy(id)
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"code": 1, "msg": "隧道不存在"})
		return
	}
	c.JSON(http.StatusOK, gin.H{"code": 0, "data": p})
}

func createProxyHandler(c *gin.Context) {
	var p Proxy
	if err := c.ShouldBindJSON(&p); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"code": 1, "msg": "请求参数错误"})
		return
	}
	p.Enabled = true // 默认启用

	if err := CreateProxy(&p); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "创建隧道失败"})
		return
	}

	// 重新生成配置并热加载
	if err := generateAndReload(); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "配置生效失败: " + err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"code": 0, "msg": "隧道创建成功", "data": gin.H{"id": p.ID}})
}

func updateProxyHandler(c *gin.Context) {
	id, _ := strconv.Atoi(c.Param("id"))
	var p Proxy
	if err := c.ShouldBindJSON(&p); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"code": 1, "msg": "请求参数错误"})
		return
	}
	p.ID = id

	if err := UpdateProxy(&p); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "更新隧道失败"})
		return
	}

	// 重新生成配置并热加载
	if err := generateAndReload(); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "配置生效失败: " + err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"code": 0, "msg": "隧道更新成功"})
}

func deleteProxyHandler(c *gin.Context) {
	id, _ := strconv.Atoi(c.Param("id"))
	if err := DeleteProxy(id); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "删除隧道失败"})
		return
	}

	// 重新生成配置并热加载
	if err := generateAndReload(); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "配置生效失败: " + err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"code": 0, "msg": "隧道删除成功"})
}

// ========== frpc 控制 ==========
func reloadFrpcHandler(c *gin.Context) {
	if err := GenerateFrpcConfig(); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "生成配置失败: " + err.Error()})
		return
	}
	if err := ReloadFrpc(); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "热加载失败: " + err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"code": 0, "msg": "热加载成功"})
}

func startFrpcHandler(c *gin.Context) {
	if err := StartFrpc(); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "启动失败: " + err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"code": 0, "msg": "frpc 启动成功"})
}

func stopFrpcHandler(c *gin.Context) {
	if err := StopFrpc(); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "停止失败: " + err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"code": 0, "msg": "frpc 已停止"})
}

func getFrpcStatusHandler(c *gin.Context) {
	running, err := GetFrpcStatus()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 2, "msg": "查询状态失败"})
		return
	}
	c.JSON(http.StatusOK, gin.H{"code": 0, "data": gin.H{"running": running}})
}

// ========== 辅助函数 ==========
func generateAndReload() error {
	if err := GenerateFrpcConfig(); err != nil {
		return err
	}
	return ReloadFrpc()
}
