package middleware

import (
	"net/http"
	"strings"

	"github.com/gin-gonic/gin"

	"laic-backend/common"
	"laic-backend/model"
	"laic-backend/service"
)

// OperationLogMiddleware 记录设备控制写操作（POST/PUT/DELETE）到 operation_log
func OperationLogMiddleware() gin.HandlerFunc {
	return func(c *gin.Context) {
		if !isMutating(c.Request.Method) {
			c.Next()
			return
		}
		path := c.Request.URL.Path
		if !isDeviceOperation(path) {
			c.Next()
			return
		}
		c.Next()

		userID := c.GetInt64("user_id")
		if userID == 0 {
			return
		}
		result := "success"
		if c.Writer.Status() >= http.StatusBadRequest {
			result = "failed"
		}
		userName := c.GetString("username")
		if name := resolveUserName(userID); name != "" {
			userName = name
		}
		service.DefaultOperationLogService.Record(
			userID, userName,
			resolveModule(path), resolveAction(c.Request.Method, path),
			path, result, c.ClientIP(),
		)
	}
}

func isMutating(method string) bool {
	return method == http.MethodPost || method == http.MethodPut || method == http.MethodDelete
}

func isDeviceOperation(path string) bool {
	parts := strings.Split(strings.Trim(path, "/"), "/")
	if len(parts) < 3 || parts[0] != "v1" {
		return false
	}
	switch parts[1] {
	case "docks":
		return len(parts) >= 4 && (parts[3] == "command" || parts[3] == "firmware")
	case "tasks":
		return len(parts) >= 4 && parts[3] == "execute"
	case "alarms":
		return len(parts) >= 4 && (parts[3] == "acknowledge" || parts[3] == "resolve")
	case "live":
		return len(parts) >= 4 && (parts[3] == "start" || parts[3] == "stop")
	default:
		return false
	}
}

// resolveUserName 从 DB 读取用户显示名（快照），失败回退为空（由调用方回退 phone）
func resolveUserName(userID int64) string {
	var u model.User
	if err := common.DB.Select("name").First(&u, userID).Error; err == nil {
		return u.Name
	}
	return ""
}

// resolveModule 将路径首个资源段映射为中文模块名
func resolveModule(path string) string {
	parts := strings.Split(strings.Trim(path, "/"), "/")
	if len(parts) < 2 {
		return "系统"
	}
	switch parts[1] {
	case "users":
		return "用户管理"
	case "roles":
		return "角色管理"
	case "docks":
		return "机巢管理"
	case "drones":
		return "无人机管理"
	case "alarms":
		return "告警管理"
	case "commands":
		return "指令管理"
	case "routes":
		return "航线管理"
	case "tasks":
		return "任务管理"
	case "executions":
		return "执行记录"
	case "firmwares":
		return "固件管理"
	case "live":
		return "直播管理"
	case "videos":
		return "视频管理"
	case "account":
		return "账户中心"
	case "logs":
		return "系统管理"
	case "auth":
		return "认证"
	default:
		return "系统"
	}
}

// resolveAction 将 HTTP 方法 + 路径末尾段映射为中文动作
func resolveAction(method, path string) string {
	seg := path
	if i := strings.LastIndex(seg, "/"); i >= 0 {
		seg = seg[i+1:]
	}
	special := map[string]string{
		"execute":     "执行任务",
		"command":     "下发指令",
		"upgrade":     "下发升级",
		"pay":         "支付订单",
		"download":    "下载视频",
		"start":       "开始直播",
		"stop":        "停止直播",
		"complete":    "确认上传",
		"recharge":    "充值",
		"resolve":     "处理告警",
		"acknowledge": "确认告警",
		"logout":      "退出登录",
	}
	if a, ok := special[seg]; ok {
		return a
	}
	switch method {
	case http.MethodPost:
		return "新增"
	case http.MethodPut:
		return "修改"
	case http.MethodDelete:
		return "删除"
	default:
		return method
	}
}