package controller

import (
	"fmt"
	"net/http"
	"strconv"

	"ezops/model"

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

// 告警规则 CRUD（AlertHandler 方法接收者，与 alert.go 同包共享） // Logan.Li

// ListRules 获取告警规则列表 // Logan.Li
// @Summary 获取告警规则列表
// @Description 获取所有告警规则列表
// @Tags 告警
// @Produce json
// @Security Bearer
// @Param page query int false "页码"
// @Param page_size query int false "每页数量"
// @Success 200 {object} model.Response{data=model.ListResponse}
// @Router /alerts/rules [get]
func (h *AlertHandler) ListRules(c *gin.Context) {
	var query model.PageQuery
	c.ShouldBindQuery(&query)

	var total int64
	h.db.Model(&model.AlertRule{}).Count(&total)

	var rules []model.AlertRule
	h.db.Offset(query.GetOffset()).Limit(query.GetLimit()).Find(&rules)

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

// CreateRule 创建告警规则 // Logan.Li
// @Summary 创建告警规则
// @Description 创建新告警规则
// @Tags 告警
// @Accept json
// @Produce json
// @Security Bearer
// @Param request body model.CreateAlertRuleRequest true "创建请求"
// @Success 200 {object} model.Response{data=model.AlertRule}
// @Router /alerts/rules [post]
func (h *AlertHandler) CreateRule(c *gin.Context) {
	var req model.CreateAlertRuleRequest
	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
	}

	rule := model.AlertRule{
		Name:           req.Name,
		Description:    req.Description,
		Type:           req.Type,
		Source:         req.Source,
		Expression:     req.Expression,
		Severity:       req.Severity,
		Duration:       req.Duration,
		DatasourceID:   req.DatasourceID,
		Labels:         req.Labels,
		Annotations:    req.Annotations,
		NotifyChannels: toJSON(req.NotifyChannels),
		Enabled:        true,
	}

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

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

// UpdateRule 更新告警规则 // Logan.Li
// @Summary 更新告警规则
// @Description 更新指定告警规则
// @Tags 告警
// @Accept json
// @Produce json
// @Security Bearer
// @Param id path int true "规则ID"
// @Param request body model.UpdateAlertRuleRequest true "更新请求"
// @Success 200 {object} model.Response{data=model.AlertRule}
// @Router /alerts/rules/{id} [put]
func (h *AlertHandler) UpdateRule(c *gin.Context) {
	id, _ := strconv.Atoi(c.Param("id"))

	var req model.UpdateAlertRuleRequest
	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
	}

	var rule model.AlertRule
	if err := h.db.First(&rule, id).Error; err != nil {
		c.JSON(http.StatusNotFound, model.Response{
			Code:    404,
			Message: "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.Expression != "" {
		updates["expression"] = req.Expression
	}
	if req.Severity != "" {
		updates["severity"] = req.Severity
	}
	if req.Duration > 0 {
		updates["duration"] = req.Duration
	}
	if req.DatasourceID > 0 {
		updates["datasource_id"] = req.DatasourceID
	}
	if req.Labels != "" {
		updates["labels"] = req.Labels
	}
	if req.Annotations != "" {
		updates["annotations"] = req.Annotations
	}
	if len(req.NotifyChannels) > 0 {
		updates["notify_channels"] = toJSON(req.NotifyChannels)
	}
	if req.Enabled != nil {
		updates["enabled"] = *req.Enabled
	}

	if err := h.db.Model(&rule).Updates(updates).Error; err != nil {
		c.JSON(http.StatusInternalServerError, model.Response{
			Code:    500,
			Message: "更新失败",
		})
		return
	}

	h.db.First(&rule, id)

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

// DeleteRule 删除告警规则 // Logan.Li
// @Summary 删除告警规则
// @Description 删除指定告警规则
// @Tags 告警
// @Produce json
// @Security Bearer
// @Param id path int true "规则ID"
// @Success 200 {object} model.Response
// @Router /alerts/rules/{id} [delete]
func (h *AlertHandler) DeleteRule(c *gin.Context) {
	id, _ := strconv.Atoi(c.Param("id"))

	if err := h.db.Delete(&model.AlertRule{}, 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",
	})
}

// BatchDeleteRules 批量删除告警规则 // Logan.Li
// @Summary 批量删除告警规则
// @Description 批量删除指定告警规则
// @Tags 告警
// @Accept json
// @Produce json
// @Security Bearer
// @Param request body model.IDsRequest true "删除请求"
// @Success 200 {object} model.Response
// @Router /alerts/rules/batch-delete [delete]
func (h *AlertHandler) BatchDeleteRules(c *gin.Context) {
	var req model.IDsRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, model.Response{
			Code:    400,
			Message: "请求参数错误",
		})
		return
	}

	if len(req.IDs) == 0 {
		c.JSON(http.StatusBadRequest, model.Response{
			Code:    400,
			Message: "请选择要删除的规则",
		})
		return
	}

	if err := h.db.Delete(&model.AlertRule{}, req.IDs).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",
	})
}

// ToggleRule 切换告警规则状态 // Logan.Li
// @Summary 切换告警规则状态
// @Description 启用或禁用告警规则
// @Tags 告警
// @Produce json
// @Security Bearer
// @Param id path int true "规则ID"
// @Success 200 {object} model.Response{data=model.AlertRule}
// @Router /alerts/rules/{id}/toggle [post]
func (h *AlertHandler) ToggleRule(c *gin.Context) {
	id, _ := strconv.Atoi(c.Param("id"))

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

	rule.Enabled = !rule.Enabled
	if err := h.db.Save(&rule).Error; err != nil {
		c.JSON(http.StatusInternalServerError, model.Response{
			Code:    500,
			Message: "操作失败",
		})
		return
	}

	c.JSON(http.StatusOK, model.Response{
		Code:    200,
		Message: "操作成功",
		Data:    rule,
	})
}

// QuickSetupRules 一键创建测试告警规则（飞书Webhook测试用） // Logan.Li
// @Summary 一键创建测试告警规则
// @Tags 告警
// @Router /alerts/quick-setup [post]
func (h *AlertHandler) QuickSetupRules(c *gin.Context) {
	type ruleDef struct {
		Name      string  `json:"name"`
		Metric    string  `json:"metric"`
		Operator  string  `json:"operator"`
		Threshold float64 `json:"threshold"`
		Port      int     `json:"port,omitempty"`
	}

	var req struct {
		Rules []ruleDef `json:"rules"`
	}
	c.ShouldBindJSON(&req)

	// 默认规则：CPU 80%, 内存 80%, 磁盘 90%, TIME_WAIT 15000, CLOSE_WAIT 200, 端口Down, 进程检测
	defaultRules := []ruleDef{
		{Name: "CPU使用率", Metric: "cpu", Operator: ">", Threshold: 80},
		{Name: "内存使用率", Metric: "mem", Operator: ">", Threshold: 80},
		{Name: "磁盘使用率", Metric: "disk", Operator: ">", Threshold: 90},
		{Name: "TIME_WAIT连接数", Metric: "tcp_time_wait", Operator: ">", Threshold: 15000},
		{Name: "CLOSE_WAIT连接数", Metric: "tcp_close_wait", Operator: ">", Threshold: 200},
		{Name: "进程异常退出", Metric: "service_process", Operator: "==", Threshold: 0},
	}

	rules := req.Rules
	if len(rules) == 0 {
		rules = defaultRules
	}

	created := 0
	for _, def := range rules {
		var existing model.AgentRule
		h.db.Where("name = ?", def.Name).First(&existing)
		if existing.ID > 0 {
			continue
		}
		rule := model.AgentRule{
			Name:      def.Name,
			Metric:    def.Metric,
			Operator:  def.Operator,
			Threshold: def.Threshold,
			Port:      def.Port,
			Enabled:   true,
		}
		if err := h.db.Create(&rule).Error; err != nil {
			continue
		}
		created++
	}

	c.JSON(http.StatusOK, model.Response{
		Code:    200,
		Message: fmt.Sprintf("已创建 %d 条告警规则", created),
		Data:    gin.H{"created": created},
	})
}