package controller

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

	"ezops/model"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

// middlewareSeedResult 种子创建结果 // Logan.Li
type middlewareSeedResult struct {
	Created int      `json:"created"`
	Skipped []string `json:"skipped"`
	Failed  []string `json:"failed"`
	Total   int64    `json:"total"`
	Message string   `json:"message"`
	Success bool     `json:"success"`
}

// SeedDefaultMiddlewareTargets 首次启动时创建平台默认 Redis/MySQL 监控目标 // Logan.Li
func SeedDefaultMiddlewareTargets(db *gorm.DB) {
	seedDefaultMiddlewareTargets(db)
}

// SeedDefaultMiddlewareTargetsAPI 手动触发添加默认监控目标 // Logan.Li
// POST /api/v1/middleware-monitors/seed-defaults
func (h *MiddlewareMonitorHandler) SeedDefaultMiddlewareTargetsAPI(c *gin.Context) {
	result := seedDefaultMiddlewareTargets(h.db)
	c.JSON(http.StatusOK, model.Response{Code: 200, Data: result})
}

// seedDefaultMiddlewareTargets 内部实现，返回创建结果 // Logan.Li
func seedDefaultMiddlewareTargets(db *gorm.DB) middlewareSeedResult {
	result := middlewareSeedResult{
		Skipped: []string{},
		Failed:  []string{},
	}
	mysqlUser := os.Getenv("DATABASE_USER")
	if mysqlUser == "" {
		mysqlUser = "root"
	}
	mysqlPassword := os.Getenv("DATABASE_PASSWORD")
	if mysqlPassword == "" {
		mysqlPassword = os.Getenv("MYSQL_ROOT_PASSWORD")
	}
	mysqlDB := os.Getenv("DATABASE_DBNAME")
	if mysqlDB == "" {
		mysqlDB = "aiops"
	}

	redisCfg, _ := json.Marshal(MiddlewareConfig{RedisMode: "standalone"})
	mysqlCfg, _ := json.Marshal(MiddlewareConfig{
		Username: mysqlUser,
		Password: mysqlPassword,
		Database: mysqlDB,
	})

	defaults := []model.MonitorTarget{
		{
			Name:        "aiops-redis",
			Type:        model.TargetTypeMiddleware,
			Status:      model.TargetStatusUnknown,
			IP:          "aiops-redis",
			Port:        6379,
			CollectMode: "api",
			Config:      string(redisCfg),
			Interval:    30,
			Description: "redis",
		},
		{
			Name:        "aiops-mysql",
			Type:        model.TargetTypeMiddleware,
			Status:      model.TargetStatusUnknown,
			IP:          "aiops-mysql",
			Port:        3306,
			CollectMode: "api",
			Config:      string(mysqlCfg),
			Interval:    30,
			Description: "mysql",
		},
	}

	for _, target := range defaults {
		var exists int64
		db.Model(&model.MonitorTarget{}).
			Where("type = ? AND name = ?", model.TargetTypeMiddleware, target.Name).
			Count(&exists)
		if exists > 0 {
			result.Skipped = append(result.Skipped, target.Name)
			continue
		}
		// host_group_id 默认 0 会触发外键约束，创建时显式忽略 // Logan.Li
		if err := db.Omit("HostGroupID").Create(&target).Error; err != nil {
			log.Printf("[MiddlewareMonitor] 种子数据创建失败 %s: %v", target.Name, err)
			result.Failed = append(result.Failed, target.Name)
			continue
		}
		result.Created++
		log.Printf("[MiddlewareMonitor] 已创建默认监控目标: %s (%s:%d)", target.Name, target.IP, target.Port)
	}

	db.Model(&model.MonitorTarget{}).Where("type = ?", model.TargetTypeMiddleware).Count(&result.Total)
	result.Success = result.Created > 0 || (len(result.Skipped) > 0 && len(result.Failed) == 0)
	switch {
	case result.Created > 0:
		result.Message = "已添加平台默认监控目标"
	case len(result.Failed) > 0:
		result.Message = "部分默认目标创建失败，请查看服务日志"
	case len(result.Skipped) > 0:
		result.Message = "默认监控目标已存在，请在下方列表查看"
	default:
		result.Message = "未创建任何默认目标"
	}
	return result
}