package handler

import (
	"net/http"

	"github.com/gin-gonic/gin"
	"kefu-sys/server/internal/middleware"
	"kefu-sys/server/internal/model"
)

type CustomerHandler struct{}

func NewCustomerHandler() *CustomerHandler { return &CustomerHandler{} }

func (h *CustomerHandler) List(c *gin.Context) {
	tenantID := middleware.GetTenantID(c)
	page, pageSize := middleware.GetPageParams(c)
	search := c.Query("search")
	status := c.Query("status")
	source := c.Query("source")

	var customers []model.Customer
	var total int64

	query := model.DB.Where("tenant_id = ?", tenantID)
	if search != "" {
		query = query.Where("name LIKE ? OR phone LIKE ? OR email LIKE ?", "%"+search+"%", "%"+search+"%", "%"+search+"%")
	}
	if status != "" {
		query = query.Where("status = ?", status)
	}
	if source != "" {
		query = query.Where("source = ?", source)
	}

	query.Model(&model.Customer{}).Count(&total)
	query.Order("updated_at desc").Offset((page - 1) * pageSize).Limit(pageSize).Find(&customers)

	middleware.JSONList(c, customers, total, page, pageSize)
}

func (h *CustomerHandler) Get(c *gin.Context) {
	tenantID := middleware.GetTenantID(c)
	id := c.Param("id")

	var customer model.Customer
	if err := model.DB.Where("id = ? AND tenant_id = ?", id, tenantID).First(&customer).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"code": 404, "message": "客户不存在"})
		return
	}

	var sessions []model.Session
	model.DB.Where("customer_id = ? AND tenant_id = ?", customer.ID, tenantID).
		Order("created_at desc").Limit(20).Find(&sessions)

	middleware.JSON(c, gin.H{"customer": customer, "sessions": sessions})
}

func (h *CustomerHandler) Create(c *gin.Context) {
	var customer model.Customer
	if err := c.ShouldBindJSON(&customer); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"code": 400, "message": "参数错误"})
		return
	}

	customer.TenantID = middleware.GetTenantID(c)

	if err := model.DB.Create(&customer).Error; err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"code": 500, "message": "创建失败"})
		return
	}

	middleware.JSON(c, customer)
}

func (h *CustomerHandler) Update(c *gin.Context) {
	tenantID := middleware.GetTenantID(c)
	id := c.Param("id")

	var customer model.Customer
	if err := model.DB.Where("id = ? AND tenant_id = ?", id, tenantID).First(&customer).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"code": 404, "message": "客户不存在"})
		return
	}

	var updates map[string]interface{}
	if err := c.ShouldBindJSON(&updates); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"code": 400, "message": "参数错误"})
		return
	}

	// 不允许修改 tenant_id
	delete(updates, "tenant_id")
	delete(updates, "id")

	model.DB.Model(&customer).Updates(updates)
	middleware.JSON(c, customer)
}

func (h *CustomerHandler) Delete(c *gin.Context) {
	tenantID := middleware.GetTenantID(c)
	id := c.Param("id")

	result := model.DB.Where("id = ? AND tenant_id = ?", id, tenantID).Delete(&model.Customer{})
	if result.RowsAffected == 0 {
		c.JSON(http.StatusNotFound, gin.H{"code": 404, "message": "客户不存在"})
		return
	}

	middleware.JSON(c, gin.H{"message": "已删除"})
}