package controller

import (
	"encoding/json"
	"net/http"
	"strconv"
	"time"

	"ezops/model"

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

// 告警静默规则 CRUD（AlertHandler 方法接收者） // Logan.Li

// CreateSilenceRequest 创建静默规则请求
type CreateSilenceRequest struct {
	Name        string   `json:"name" binding:"required"`
	Description string   `json:"description"`
	RuleIDs     []uint   `json:"rule_ids"`
	TargetIDs   []uint   `json:"target_ids"`
	Matchers    []model.AlertSilenceMatcher `json:"matchers"`
	SilenceType string   `json:"silence_type"`
	StartTime   string   `json:"start_time"`
	EndTime     string   `json:"end_time" binding:"required"`
	Weekdays    []int    `json:"weekdays"`
	Status      *int     `json:"status"`
}

// UpdateSilenceRequest 更新静默规则请求
type UpdateSilenceRequest struct {
	Name        string   `json:"name"`
	Description string   `json:"description"`
	RuleIDs     []uint   `json:"rule_ids"`
	TargetIDs   []uint   `json:"target_ids"`
	Matchers    []model.AlertSilenceMatcher `json:"matchers"`
	SilenceType string   `json:"silence_type"`
	StartTime   string   `json:"start_time"`
	EndTime     string   `json:"end_time"`
	Weekdays    []int    `json:"weekdays"`
	Status      *int     `json:"status"`
}

// ListSilences GET /alerts/silences
func (h *AlertHandler) ListSilences(c *gin.Context) {
	var silences []model.AlertSilence
	query := h.db.Order("created_at DESC")

	if status := c.Query("status"); status != "" {
		if status == "active" {
			now := time.Now()
			query = query.Where("status = ? AND start_time <= ? AND end_time >= ?", 1, now, now)
		} else if s, err := strconv.Atoi(status); err == nil {
			query = query.Where("status = ?", s)
		}
	}

	query.Find(&silences)

	// 解析 JSON 字段为前端友好的格式
	type SilenceWithParsed struct {
		model.AlertSilence
		RuleIDList   []uint                        `json:"rule_id_list"`
		TargetIDList []uint                        `json:"target_id_list"`
		MatcherList  []model.AlertSilenceMatcher   `json:"matcher_list"`
		WeekdayList  []int                         `json:"weekday_list"`
		IsActive     bool                          `json:"is_active"`
	}

	var result []SilenceWithParsed
	now := time.Now()
	for _, s := range silences {
		item := SilenceWithParsed{AlertSilence: s}
		if s.RuleIDs != "" {
			json.Unmarshal([]byte(s.RuleIDs), &item.RuleIDList)
		}
		if s.TargetIDs != "" {
			json.Unmarshal([]byte(s.TargetIDs), &item.TargetIDList)
		}
		if s.Matchers != "" {
			json.Unmarshal([]byte(s.Matchers), &item.MatcherList)
		}
		if s.Weekdays != "" {
			json.Unmarshal([]byte(s.Weekdays), &item.WeekdayList)
		}
		item.IsActive = s.Status == 1 && now.After(s.StartTime) && now.Before(s.EndTime)
		result = append(result, item)
	}

	c.JSON(http.StatusOK, model.Response{
		Code:    200,
		Message: "success",
		Data:    model.ListResponse{List: result, Total: int64(len(result))},
	})
}

// CreateSilence POST /alerts/silences
func (h *AlertHandler) CreateSilence(c *gin.Context) {
	var req CreateSilenceRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: "请求参数错误: " + err.Error()})
		return
	}

	silenceType := model.AlertSilenceOneTime
	if req.SilenceType != "" {
		silenceType = model.AlertSilenceType(req.SilenceType)
	}

	// 解析时间
	var startTime, endTime time.Time
	var err error
	if req.StartTime != "" {
		startTime, err = time.Parse(time.RFC3339, req.StartTime)
		if err != nil {
			startTime, err = time.ParseInLocation("2006-01-02 15:04:05", req.StartTime, time.Local)
			if err != nil {
				startTime = time.Now()
			}
		}
	} else {
		startTime = time.Now()
	}

	endTime, err = time.Parse(time.RFC3339, req.EndTime)
	if err != nil {
		endTime, err = time.ParseInLocation("2006-01-02 15:04:05", req.EndTime, time.Local)
		if err != nil {
			c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: "结束时间格式错误"})
			return
		}
	}

	ruleIDsJSON, _ := json.Marshal(req.RuleIDs)
	targetIDsJSON, _ := json.Marshal(req.TargetIDs)
	matchersJSON, _ := json.Marshal(req.Matchers)
	weekdaysJSON, _ := json.Marshal(req.Weekdays)

	silence := model.AlertSilence{
		Name:        req.Name,
		Description: req.Description,
		RuleIDs:     string(ruleIDsJSON),
		TargetIDs:   string(targetIDsJSON),
		Matchers:    string(matchersJSON),
		SilenceType: silenceType,
		StartTime:   startTime,
		EndTime:     endTime,
		Weekdays:    string(weekdaysJSON),
		Status:      1,
	}

	// 获取创建人 ID
	if userID, exists := c.Get("userID"); exists {
		if uid, ok := userID.(uint); ok {
			silence.CreatedBy = uid
		}
	}

	if err := h.db.Create(&silence).Error; err != nil {
		c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "创建失败: " + err.Error()})
		return
	}

	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "创建成功", Data: silence})
}

// UpdateSilence PUT /alerts/silences/:id
func (h *AlertHandler) UpdateSilence(c *gin.Context) {
	id, _ := strconv.Atoi(c.Param("id"))
	var req UpdateSilenceRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: "请求参数错误"})
		return
	}

	var silence model.AlertSilence
	if err := h.db.First(&silence, id).Error; err != nil {
		c.JSON(http.StatusNotFound, model.Response{Code: 404, Message: "静默规则不存在"})
		return
	}

	updates := map[string]interface{}{}
	if req.Name != "" {
		updates["name"] = req.Name
	}
	if req.Description != "" {
		updates["description"] = req.Description
	}
	if req.SilenceType != "" {
		updates["silence_type"] = req.SilenceType
	}
	if len(req.RuleIDs) > 0 || req.RuleIDs != nil {
		ruleIDsJSON, _ := json.Marshal(req.RuleIDs)
		updates["rule_ids"] = string(ruleIDsJSON)
	}
	if len(req.TargetIDs) > 0 || req.TargetIDs != nil {
		targetIDsJSON, _ := json.Marshal(req.TargetIDs)
		updates["target_ids"] = string(targetIDsJSON)
	}
	if len(req.Matchers) > 0 || req.Matchers != nil {
		matchersJSON, _ := json.Marshal(req.Matchers)
		updates["matchers"] = string(matchersJSON)
	}
	if len(req.Weekdays) > 0 || req.Weekdays != nil {
		weekdaysJSON, _ := json.Marshal(req.Weekdays)
		updates["weekdays"] = string(weekdaysJSON)
	}
	if req.StartTime != "" {
		if st, err := time.Parse(time.RFC3339, req.StartTime); err == nil {
			updates["start_time"] = st
		} else if st, err := time.ParseInLocation("2006-01-02 15:04:05", req.StartTime, time.Local); err == nil {
			updates["start_time"] = st
		}
	}
	if req.EndTime != "" {
		if et, err := time.Parse(time.RFC3339, req.EndTime); err == nil {
			updates["end_time"] = et
		} else if et, err := time.ParseInLocation("2006-01-02 15:04:05", req.EndTime, time.Local); err == nil {
			updates["end_time"] = et
		}
	}
	if req.Status != nil {
		updates["status"] = *req.Status
	}

	h.db.Model(&silence).Updates(updates)
	h.db.First(&silence, id)

	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "更新成功", Data: silence})
}

// DeleteSilence DELETE /alerts/silences/:id
func (h *AlertHandler) DeleteSilence(c *gin.Context) {
	id, _ := strconv.Atoi(c.Param("id"))
	if err := h.db.Delete(&model.AlertSilence{}, id).Error; err != nil {
		c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "删除失败"})
		return
	}
	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "删除成功"})
}

// ToggleSilence POST /alerts/silences/:id/toggle
func (h *AlertHandler) ToggleSilence(c *gin.Context) {
	id, _ := strconv.Atoi(c.Param("id"))
	var silence model.AlertSilence
	if err := h.db.First(&silence, id).Error; err != nil {
		c.JSON(http.StatusNotFound, model.Response{Code: 404, Message: "静默规则不存在"})
		return
	}

	newStatus := 0
	if silence.Status == 0 {
		newStatus = 1
	}

	h.db.Model(&silence).Update("status", newStatus)
	h.db.First(&silence, id)

	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "切换成功", Data: silence})
}