package handlers

import (
	"net/http"
	"smart-customer-service/internal/models"
	"database/sql"
	"encoding/json"
	"fmt"
	"strconv"
)

// TenantHandler 租户处理器
type TenantHandler struct {
	// 这里可以添加 database 连接
}

// Create 创建租户
func (h *TenantHandler) Create(w http.ResponseWriter, r *http.Request) {
	var tenant models.Tenant
	if err := json.NewDecoder(r.Body).Decode(&tenant); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	
	// 验证必填字段
	if tenant.Name == "" || tenant.Email == "" {
		http.Error(w, `{"error": "name and email are required"}`, http.StatusBadRequest)
		return
	}
	
	// TODO: 保存到数据库
	// db.Create(&tenant)
	
	// 返回响应
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusCreated)
	json.NewEncoder(w).Encode(map[string]interface{}{
		"message": "租户创建成功",
		"data": tenant,
	})
}

// List 获取租户列表
func (h *TenantHandler) List(w http.ResponseWriter, r *http.Request) {
	// 获取分页参数
	page, _ := strconv.Atoi(r.URL.Query().Get("page"))
	if page == 0 {
		page = 1
	}
	perPage, _ := strconv.Atoi(r.URL.Query().Get("per_page"))
	if perPage == 0 {
		perPage = 20
	}
	
	// TODO: 查询数据库
	// var tenants []models.Tenant
	// db.Offset((page-1)*perPage).Limit(perPage).Find(&tenants)
	
	var tenants []models.Tenant
	
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]interface{}{
		"total":      0,
		"page":       page,
		"per_page":   perPage,
		"total_pages": 0,
		"data":       tenants,
	})
}

// Get 获取单个租户
func (h *TenantHandler) Get(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.ParseUint(r.URL.Query().Get("id"), 10, 32)
	if err != nil {
		http.Error(w, `{"error": "invalid id"}`, http.StatusBadRequest)
		return
	}
	
	// TODO: 查询数据库
	// var tenant models.Tenant
	// db.First(&tenant, id)
	
	var tenant models.Tenant
	
	if tenant.ID == 0 {
		http.Error(w, `{"error": "tenant not found"}`, http.StatusNotFound)
		return
	}
	
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(tenant)
}

// Update 更新租户
func (h *TenantHandler) Update(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.ParseUint(r.URL.Query().Get("id"), 10, 32)
	if err != nil {
		http.Error(w, `{"error": "invalid id"}`, http.StatusBadRequest)
		return
	}
	
	var tenant models.Tenant
	if err := json.NewDecoder(r.Body).Decode(&tenant); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	
	// TODO: 更新数据库
	// db.Model(&tenant).Where("id = ?", id).Updates(map[string]interface{}{
	//     "name": tenant.Name,
	//     "email": tenant.Email,
	// })
	
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]interface{}{
		"message": "租户更新成功",
		"data":    tenant,
	})
}

// Delete 删除租户
func (h *TenantHandler) Delete(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.ParseUint(r.URL.Query().Get("id"), 10, 32)
	if err != nil {
		http.Error(w, `{"error": "invalid id"}`, http.StatusBadRequest)
		return
	}
	
	// TODO: 软删除
	// db.Where("id = ?", id).Update("deleted_at", time.Now())
	
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]interface{}{
		"message": fmt.Sprintf("租户 %d 删除成功", id),
	})
}