package controller

import (
	"GolangLearnPractice1/bookstore2/dao"
	"GolangLearnPractice1/bookstore2/model"
	"html/template"
	"net/http"
	"strconv"
)

//AddBook2Cart 把图书添加到购物车中
func AddBook2Cart(w http.ResponseWriter, r *http.Request) {
	flag, session := dao.IsLogin(r)
	if flag {
		//用户已经登录
		//查看该图书（购物项）是否已经在用户的购物车中
		bookID := r.PostFormValue("bookId")
		ibookID, _ := strconv.ParseInt(bookID, 10, 64)
		book, _ := dao.GetBookByID(bookID)
		//得到该购物车中图书
		cart, _ := dao.GetCartByUserID(session.UserID)
		for _, v := range cart.CartItems {
			if v.Book.BookID == ibookID {
				//该图书已经在购物车中，找到购物项，增加图书数量即可
				v.Count++
				v.Amount = v.Amount + v.Book.Price
				dao.AddBook2CartItem(v)

				w.Write([]byte("您刚刚将《" + book.Title + "》加入了购物车"))
				return
			}
		}
		//该图书尚未在购物车中，需添加到购物车中
		cartItem := &model.CartItem{
			CartID: cart.CartID,
			Book:   book,
			Count:  1,
			Amount: book.Price,
		}
		dao.AddCartItem(cartItem)

		//
		w.Write([]byte("您刚刚将《" + book.Title + "》加入了购物车"))
		return
	}
	//用户尚未登录
	w.Write([]byte("请先登录！"))
	return
}

//GetCartInfo 得到购物车信息
func GetCartInfo(w http.ResponseWriter, r *http.Request) {
	_, session := dao.IsLogin(r)
	cart, _ := dao.GetCartByUserID(session.UserID)
	if dao.CartIsNULL(cart.CartID) {
		//用户购物车为空,转到购物车空页面
		// GetPagesByPrice(w, r)
		// return

	}
	//用户购物车不为空,显示购物车信息
	t := template.Must(template.ParseFiles("view/pages/cart/cart.html"))
	t.Execute(w, cart)
}

//DeleteCart 删除购物车
func DeleteCart(w http.ResponseWriter, r *http.Request) {
	_, session := dao.IsLogin(r)
	dao.DeleteCart(session.UserID)
	cart, _ := dao.GetCartByUserID(session.UserID)
	//用户购物车为空,转到购物车空页面
	// GetPagesByPrice(w, r)
	t := template.Must(template.ParseFiles("view/pages/cart/cart.html"))
	t.Execute(w, cart)
}