package handlers

import (
	"context"
	"net/http"
	"time"

	"ezops/internal/models"
	"ezops/pkg/zabbix"

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

// ZabbixDSHandler Zabbix 数据源管理 handler // Logan.Li
type ZabbixDSHandler struct {
	db *gorm.DB
}

// NewZabbixDSHandler 创建 Zabbix 数据源 handler
func NewZabbixDSHandler(db *gorm.DB) *ZabbixDSHandler {
	return &ZabbixDSHandler{db: db}
}

// ============================================
// CRUD
// ============================================

// List 数据源列表
// GET /api/v1/zabbix-datasources
func (h *ZabbixDSHandler) List(c *gin.Context) {
	var sources []models.ZabbixDataSource
	if err := h.db.Order("is_default DESC, id ASC").Find(&sources).Error; err != nil {
		c.JSON(http.StatusInternalServerError, models.Response{Code: 500, Message: "查询失败: " + err.Error()})
		return
	}
	if sources == nil {
		sources = []models.ZabbixDataSource{}
	}
	c.JSON(http.StatusOK, models.Response{Code: 200, Data: sources})
}

// Get 获取单个数据源
// GET /api/v1/zabbix-datasources/:id
func (h *ZabbixDSHandler) Get(c *gin.Context) {
	id := c.Param("id")
	var ds models.ZabbixDataSource
	if err := h.db.First(&ds, id).Error; err != nil {
		c.JSON(http.StatusNotFound, models.Response{Code: 404, Message: "数据源不存在"})
		return
	}
	c.JSON(http.StatusOK, models.Response{Code: 200, Data: ds})
}

// Create 创建数据源
// POST /api/v1/zabbix-datasources
func (h *ZabbixDSHandler) Create(c *gin.Context) {
	var req models.CreateZabbixDSReq
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, models.Response{Code: 400, Message: "参数错误: " + err.Error()})
		return
	}

	if req.IsDefault {
		h.db.Model(&models.ZabbixDataSource{}).Where("is_default = ?", true).Update("is_default", false)
	}

	ds := models.ZabbixDataSource{
		Name:                 req.Name,
		URL:                  req.URL,
		Username:             req.Username,
		Password:             req.Password,
		TrendsAfter:          req.TrendsAfter,
		TrendsRange:          req.TrendsRange,
		TrendsCacheTTL:       req.TrendsCacheTTL,
		TrendsTimeout:        req.TrendsTimeout,
		DirectDB:             req.DirectDB,
		DisableAcknowledges:  req.DisableAcknowledges,
		DisableDataAlignment: req.DisableDataAlignment,
		IsDefault:            req.IsDefault,
		Status:               1,
	}

	if ds.TrendsCacheTTL <= 0 {
		ds.TrendsCacheTTL = 3600
	}
	if ds.TrendsTimeout <= 0 {
		ds.TrendsTimeout = 30
	}

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

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

// Update 更新数据源
// PUT /api/v1/zabbix-datasources/:id
func (h *ZabbixDSHandler) Update(c *gin.Context) {
	id := c.Param("id")
	var ds models.ZabbixDataSource
	if err := h.db.First(&ds, id).Error; err != nil {
		c.JSON(http.StatusNotFound, models.Response{Code: 404, Message: "数据源不存在"})
		return
	}

	var req models.UpdateZabbixDSReq
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, models.Response{Code: 400, Message: "参数错误: " + err.Error()})
		return
	}

	updates := map[string]interface{}{}
	if req.Name != nil { updates["name"] = *req.Name }
	if req.URL != nil { updates["url"] = *req.URL }
	if req.Username != nil { updates["username"] = *req.Username }
	if req.Password != nil && *req.Password != "" { updates["password"] = *req.Password }
	if req.TrendsAfter != nil { updates["trends_after"] = *req.TrendsAfter }
	if req.TrendsRange != nil { updates["trends_range"] = *req.TrendsRange }
	if req.TrendsCacheTTL != nil { updates["trends_cache_ttl"] = *req.TrendsCacheTTL }
	if req.TrendsTimeout != nil { updates["trends_timeout"] = *req.TrendsTimeout }
	if req.DirectDB != nil { updates["direct_db"] = *req.DirectDB }
	if req.DisableAcknowledges != nil { updates["disable_acknowledges"] = *req.DisableAcknowledges }
	if req.DisableDataAlignment != nil { updates["disable_data_alignment"] = *req.DisableDataAlignment }
	if req.IsDefault != nil {
		updates["is_default"] = *req.IsDefault
		if *req.IsDefault {
			h.db.Model(&models.ZabbixDataSource{}).Where("is_default = ? AND id != ?", true, id).Update("is_default", false)
		}
	}
	if req.Status != nil { updates["status"] = *req.Status }

	if len(updates) > 0 {
		if err := h.db.Model(&ds).Updates(updates).Error; err != nil {
			c.JSON(http.StatusInternalServerError, models.Response{Code: 500, Message: "更新失败: " + err.Error()})
			return
		}
	}

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

// Delete 删除数据源
// DELETE /api/v1/zabbix-datasources/:id
func (h *ZabbixDSHandler) Delete(c *gin.Context) {
	id := c.Param("id")
	if err := h.db.Delete(&models.ZabbixDataSource{}, id).Error; err != nil {
		c.JSON(http.StatusInternalServerError, models.Response{Code: 500, Message: "删除失败: " + err.Error()})
		return
	}
	c.JSON(http.StatusOK, models.Response{Code: 200, Message: "已删除"})
}

// SetDefault 设为默认
// POST /api/v1/zabbix-datasources/:id/default
func (h *ZabbixDSHandler) SetDefault(c *gin.Context) {
	id := c.Param("id")
	h.db.Model(&models.ZabbixDataSource{}).Where("is_default = ?", true).Update("is_default", false)
	if err := h.db.Model(&models.ZabbixDataSource{}).Where("id = ?", id).Update("is_default", true).Error; err != nil {
		c.JSON(http.StatusInternalServerError, models.Response{Code: 500, Message: "设置失败: " + err.Error()})
		return
	}
	c.JSON(http.StatusOK, models.Response{Code: 200, Message: "已设为默认"})
}

// TestConnection 测试 Zabbix 连接
// POST /api/v1/zabbix-datasources/test
func (h *ZabbixDSHandler) TestConnection(c *gin.Context) {
	var req models.TestZabbixDSReq
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, models.Response{Code: 400, Message: "参数错误: " + err.Error()})
		return
	}

	client := zabbix.NewClient(req.URL, req.Username, req.Password,
		zabbix.WithHTTPTimeout(10*time.Second),
	)

	ctx, cancel := context.WithTimeout(context.Background(), 12*time.Second)
	defer cancel()

	if err := client.Auth(ctx); err != nil {
		c.JSON(http.StatusOK, models.Response{
			Code: 200,
			Data: map[string]interface{}{
				"success": false,
				"message": "认证失败: " + err.Error(),
			},
		})
		return
	}

	token := client.GetAuthToken()

	c.JSON(http.StatusOK, models.Response{
		Code: 200,
		Data: map[string]interface{}{
			"success":    true,
			"message":    "连接成功，Zabbix 认证通过",
			"session_id": token,
		},
	})
}