const app = getApp();
const regeneratorRuntime = app.loadAsync()
const { StorageSync } = require("./getSetting")
const util = app.loadUtils("util")
const { Msg } = require("../model/message")
const msg = new Msg()

export class ShopCart extends StorageSync {
    constructor() {
        super()
    }
    /**
     * 获取本地购物车缓存如果没有数据返回空数组
     */
    async getCart() {
        let that = this
        let shopCart = await that.getSetting("shopCart")
        if (typeof shopCart === 'undefined') {
            await this.setStorage("shopCart", [])
            return await []
        }
        return await shopCart
    }
    /**
     * 
     * @param { Object } data 放到购物中的数据
     */
    async setCart(data) {
        let getCart = await this.getCart()
        if (data.num <= 0) {
            data.num = ++data.num
        }
        if (getCart.length <= 0) {
            getCart.push(data)
        } else {
            for (let i = 0; i < getCart.length; i++) {
                if (util.Compare(getCart[i], data, "num")) {
                    getCart[i].num += data.num
                    break;
                }
                if (getCart.length - 1 == i) {
                    getCart.push(data)
                    break;
                }
            }
        }
        this.setStorage("shopCart", getCart)
        // 更新角标
        app.globalData.cartNum = getCart.length
        wx.showToast({
            title: '添加成功,在购物车等亲~',
            icon: 'none',
            duration: 800
        })
    }
    /**
     * 
     * @param { Object } data 已经更新过的数据
     */
    async updateCart(data) {
        let that = this
        let getCart = await this.getCart()
        for (let i = 0; i < getCart.length; i++) {
            if (util.Compare(getCart[i], data, "num")) {
                if (data.num == 0) {
                    getCart.splice(i, 1)
                    break;
                }
                getCart[i].num = data.num
                break;
            }
        }
        return new Promise((resolve, reject) => {
            if (data.num == 0) {
                wx.showModal({
                    title: '删除该商品',
                    content: '点击确定删除',
                    confirmText: "确认",
                    cancelText: "取消",
                    async success(res) {
                        if (res.confirm) {
                            that.setStorage("shopCart", getCart)
                            // 更新角标
                            app.globalData.cartNum = getCart.length
                            resolve(getCart)
                        }
                    }
                })
            } else {
                this.setStorage("shopCart", getCart)
                // 更新角标
                app.globalData.cartNum = getCart.length
                resolve(getCart)
            }
        })
    }
    /**
     * 
     */
    async getCartMon() {
        let cart = await this.getCart()
        let totalprice = 0
        cart.map((v, i) => {
            totalprice += v.num * v.price
        })
        return totalprice
    }
    /**
     * 购物车删除商品
     *  @param { Object } data 需要删除的商品id
     */
    async deleteCart(data) {
        let getCart = await this.getCart()
        let newCart = []
        let newData = data.allCart
        newData.map((v, i) => {
            if (typeof v.isShow == 'boolean') {
                delete newData[i].isShow
            }
        })
        getCart.map((v, i) => {
            let n = newData.filter(n => {
                return util.Compare(v, n, "num")
            })
            if (n.length <= 0) {
                newCart.push(v)
            }
        })
        this.setStorage("shopCart", newCart)
        // 更新角标
        app.globalData.cartNum = newCart.length
    }
}