package controllers

import (
	"strconv"
	"time"

	"lokistack/dto"
	"lokistack/models"
	"lokistack/repository"
	"lokistack/services"
	"lokistack/utils"

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

// AlertsController 告警规则 + 飞书通知配置
type AlertsController struct{}

func NewAlertsController() *AlertsController { return &AlertsController{} }

// ==================== 通知配置 ====================

// GetNotifyConfig 通知配置(只回 enabled/hasWebhook/hasSecret)
func (ctrl *AlertsController) GetNotifyConfig(c *gin.Context) {
	cfg := services.GetNotifyConfig()
	utils.Success(c, services.NotifyPublicConfig{
		Enabled: cfg.Enabled, HasWebhook: cfg.Webhook != "", HasSecret: cfg.SigningSecret != "",
	})
}

// UpdateNotifyConfig 保存(webhook/签名留空=保留旧值)
func (ctrl *AlertsController) UpdateNotifyConfig(c *gin.Context) {
	var req dto.NotifyConfigRequest
	if !utils.BindAndValidate(c, &req) {
		return
	}
	if err := services.SaveNotifyConfig(req.Enabled, req.Webhook, req.SigningSecret); err != nil {
		utils.Error(c, 400, err.Error())
		return
	}
	utils.Success(c, gin.H{"message": "saved"})
}

// TestNotifyConfig 发送测试卡片(验证 webhook 连通)
func (ctrl *AlertsController) TestNotifyConfig(c *gin.Context) {
	cfg := services.GetNotifyConfig()
	if !cfg.Enabled || cfg.Webhook == "" {
		utils.Error(c, 400, "请先保存并启用飞书通知")
		return
	}
	if err := services.SendLarkCard("✅ LokiStack 通知测试", "green", []string{
		"**时间**: " + time.Now().Format("2006-01-02 15:04:05"),
		"**说明**: 管理员在设置页手动触发的连通性测试。",
	}); err != nil {
		utils.Error(c, 502, err.Error())
		return
	}
	utils.Success(c, gin.H{"status": "sent"})
}

// ==================== 告警规则 CRUD ====================

func (ctrl *AlertsController) ListRules(c *gin.Context) {
	db := repository.GetDB()
	db.RLock()
	out := make([]map[string]interface{}, 0, len(db.AlertRules))
	for i := range db.AlertRules {
		out = append(out, db.AlertRules[i].Sanitized())
	}
	db.RUnlock()
	utils.Success(c, out)
}

func (ctrl *AlertsController) CreateRule(c *gin.Context) {
	var req dto.AlertRuleRequest
	if !utils.BindAndValidate(c, &req) {
		return
	}
	if req.WindowMin <= 0 {
		req.WindowMin = 15
	}
	if req.CooldownMin <= 0 {
		req.CooldownMin = 60
	}
	if req.Threshold < 0 {
		req.Threshold = 0
	}
	db := repository.GetDB()
	rule := &models.AlertRule{
		ID: db.NextID("alertRules"), Name: req.Name, SourceID: req.SourceID,
		ChannelIDs: req.ChannelIDs,
		Query:      req.Query, WindowMin: req.WindowMin, Threshold: req.Threshold,
		Enabled: req.Enabled, CooldownMin: req.CooldownMin,
	}
	db.Lock()
	db.AlertRules = append(db.AlertRules, *rule)
	db.RequestSave()
	db.Unlock()
	utils.Success(c, rule.Sanitized())
}

func (ctrl *AlertsController) UpdateRule(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		utils.BadRequest(c, "ID 无效")
		return
	}
	var req map[string]interface{}
	if !utils.BindAndValidate(c, &req) {
		return
	}
	db := repository.GetDB()
	db.Lock()
	defer db.Unlock()
	for i := range db.AlertRules {
		if db.AlertRules[i].ID != uint(id) {
			continue
		}
		if v, ok := req["name"].(string); ok && v != "" {
			db.AlertRules[i].Name = v
		}
		if v, ok := req["query"].(string); ok && v != "" {
			db.AlertRules[i].Query = v
		}
		if v, ok := req["sourceId"].(float64); ok && v > 0 {
			db.AlertRules[i].SourceID = uint(v)
		}
		if arr, ok := req["channelIds"].([]interface{}); ok {
			ids := make([]uint, 0, len(arr))
			for _, item := range arr {
				if v, ok := item.(float64); ok && v > 0 {
					ids = append(ids, uint(v))
				}
			}
			db.AlertRules[i].ChannelIDs = ids
		}
		if v, ok := req["windowMin"].(float64); ok && v > 0 {
			db.AlertRules[i].WindowMin = int(v)
		}
		if v, ok := req["threshold"].(float64); ok && v >= 0 {
			db.AlertRules[i].Threshold = int(v)
		}
		if v, ok := req["cooldownMin"].(float64); ok && v > 0 {
			db.AlertRules[i].CooldownMin = int(v)
		}
		if v, ok := req["enabled"].(bool); ok {
			db.AlertRules[i].Enabled = v
		}
		db.AlertRules[i].UpdatedAt = time.Now()
		db.RequestSave()
		utils.Success(c, db.AlertRules[i].Sanitized())
		return
	}
	utils.NotFound(c, "规则不存在")
}

func (ctrl *AlertsController) DeleteRule(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		utils.BadRequest(c, "ID 无效")
		return
	}
	db := repository.GetDB()
	db.Lock()
	defer db.Unlock()
	for i := range db.AlertRules {
		if db.AlertRules[i].ID == uint(id) {
			db.AlertRules = append(db.AlertRules[:i], db.AlertRules[i+1:]...)
			db.RequestSave()
			utils.Success(c, gin.H{"message": "deleted"})
			return
		}
	}
	utils.NotFound(c, "规则不存在")
}

// CheckNow 手动触发一次全量检查(不等定时器)
func (ctrl *AlertsController) CheckNow(c *gin.Context) {
	services.RunAlertCheck(c.Request.Context())
	utils.Success(c, gin.H{"message": "checked"})
}

// Deliveries 发送历史(最近 50)
func (ctrl *AlertsController) Deliveries(c *gin.Context) {
	db := repository.GetDB()
	db.RLock()
	out := make([]map[string]interface{}, 0, len(db.AlertDeliveries))
	for i := len(db.AlertDeliveries) - 1; i >= 0 && len(out) < 50; i-- {
		d := db.AlertDeliveries[i]
		out = append(out, map[string]interface{}{
			"id": d.ID, "ruleId": d.RuleID, "ruleName": d.RuleName,
			"count": d.Count, "status": d.Status, "reason": d.Reason, "createdAt": d.CreatedAt,
		})
	}
	db.RUnlock()
	utils.Success(c, out)
}

// ==================== 通知通道(多 webhook) ====================

func (ctrl *AlertsController) ListChannels(c *gin.Context) {
	utils.Success(c, services.ListNotifyChannels())
}

func (ctrl *AlertsController) SaveChannel(c *gin.Context) {
	var req dto.NotifyChannelRequest
	if !utils.BindAndValidate(c, &req) {
		return
	}
	// PUT /channels/:id 时路径参数优先
	if pathID := c.Param("id"); pathID != "" {
		if v, err := strconv.ParseUint(pathID, 10, 64); err == nil {
			req.ID = uint(v)
		}
	}
	ch, err := services.SaveNotifyChannel(req.ID, req.Name, req.Webhook, req.SigningSecret, req.Enabled)
	if err != nil {
		utils.Error(c, 400, err.Error())
		return
	}
	utils.Success(c, ch.Sanitized())
}

func (ctrl *AlertsController) DeleteChannel(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		utils.BadRequest(c, "ID 无效")
		return
	}
	if err := services.DeleteNotifyChannel(uint(id)); err != nil {
		utils.Error(c, 400, err.Error())
		return
	}
	utils.Success(c, gin.H{"message": "deleted"})
}

// TestChannel 向指定通道发送测试卡片(用表单参数或已存通道)
func (ctrl *AlertsController) TestChannel(c *gin.Context) {
	var req dto.NotifyChannelRequest
	if !utils.BindAndValidate(c, &req) {
		return
	}
	// 测试已存通道时 name 可不传(沿用原名称);直测新 webhook 时缺省名
	name := req.Name
	if req.ID > 0 {
		if existing := services.GetNotifyChannel(req.ID); existing != nil && name == "" {
			name = existing.Name
		}
	} else if name == "" {
		name = "临时测试通道"
	}
	var channelID uint
	if req.ID > 0 {
		channelID = req.ID
		// 表单 webhook 非空时先保存再测(未保存也可测新地址)
		if req.Webhook != "" {
			if _, err := services.SaveNotifyChannel(req.ID, name, req.Webhook, req.SigningSecret, true); err != nil {
				utils.Error(c, 400, err.Error())
				return
			}
		}
	} else if req.Webhook != "" {
		// 未保存直测:保存后可删
		ch, err := services.SaveNotifyChannel(0, name, req.Webhook, req.SigningSecret, true)
		if err != nil {
			utils.Error(c, 400, err.Error())
			return
		}
		channelID = ch.ID
	}
	if channelID == 0 {
		utils.BadRequest(c, "请提供通道 ID 或 webhook 地址")
		return
	}
	if err := services.SendLarkCardToChannel(channelID, "✅ LokiStack 通道测试", "green", []string{
		"**时间**: " + time.Now().Format("2006-01-02 15:04:05"),
		"**说明**: 通道连通性测试。",
	}); err != nil {
		utils.Error(c, 502, err.Error())
		return
	}
	utils.Success(c, gin.H{"status": "sent"})
}