// 获取已选商品列表
export function totalAllCheckedProduct(shopList) {
    let productList = []
    shopList.forEach(shop => {
        productList.push(...shop.productList.filter(product => product.checked))
    })
    return productList
}

// 计算购物车商品价格
export function computeTotalPrice(productList) {
    const { allPrice } = productList.reduce((prevPrice, product) => {
        // 已选商品总价
        prevPrice.originalPrice += product.price * product.num
        // 单品满减
        if (product.promotion && product.promotion.type == 1 && product.promotion.mode == 2) {
            // 是否满足 满减条件
            if (product.price * product.num >= product.promotion.touchPrice) {
                prevPrice.reducedPrice += product.promotion.reducedPrice
            }
        }
        prevPrice.allPrice = prevPrice.originalPrice - prevPrice.reducedPrice
        return prevPrice
    }, {
        originalPrice: 0, // 商品总价
        reducedPrice: 0, // 优惠金额
        allPrice: 0 // 组后后价格
    })
    return allPrice
}

// 处理优惠券列表: 排序,优惠券点击类型
export function initFormatCouponList(couponList = [], controlType, sort) {
    couponList = couponList.map((coupon, index) => {
        coupon.controlType = controlType
        coupon.checked = false
        coupon.uniqueId = index + 1
        return coupon
    })

    if (sort) {
        return couponList.sort((a, b) => b.couponAmount - a.couponAmount)
    }

    return couponList
}

// 将优惠券列表拆分为满足条件和为满足条件列表
export function splitCouponList(couponList = [], productList = []) {
    const result = {
        canUseCouponList: [],
        notUseCouponList: []
    }
    couponList.forEach(coupon => {
        if (
            coupon.noThresholdFlag === 1 ||
            (coupon.productType === 1 && allProdoctUseCheck(productList, coupon)) ||
            (coupon.productType === 2 && someProductUseCheck(productList, coupon))
        ) {
            result.canUseCouponList.push(coupon)
        } else {
            result.notUseCouponList.push(coupon)
        }
    })
    return result
}

// 判断全部商品可用 (全部商品价格总计 是否大于 当前优惠券的触发金额)
export function allProdoctUseCheck(productList, coupon) {
    const countPrice = productList.reduce((countPrice, product) => countPrice + product.price * product.num, 0)
    console.log('all', countPrice)
    return countPrice >= coupon.touchPrice
}

// 判断指定商品可用 (当前优惠券可用的商品的价格总计 是否大于 当前优惠券的触发金额)
export function someProductUseCheck(productList, coupon) {
    const countPrice = productList.reduce((countPrice, product) => {
        // 当前优惠券可用的商品总价
        const isIncludes = coupon.productIds.indexOf(product.productId.toString()) > -1
        return isIncludes ? countPrice + product.price * product.num : countPrice
    }, 0)
    console.log('some', countPrice)
    return countPrice >= coupon.touchPrice
}

// 优惠券使用提示
export function makeCouponUseTip(currentCoupon, nextCoupon, allPrice) {
    // 两者都不存在
    if (!currentCoupon && !nextCoupon) return ''

    // 只有可使用券时
    if (currentCoupon && !nextCoupon) {
        if (currentCoupon.noThresholdFlag === 1) {
            return `已享“减${currentCoupon.couponAmount}元”优惠券`
        }

        return `已享“满${currentCoupon.touchPrice}元减${currentCoupon.couponAmount}元”优惠券`
    }

    // 只有下阶段券时
    if (!currentCoupon && nextCoupon) {
        const { couponAmount: nextCouponAmount, touchPrice: nextTouchPrice } = nextCoupon
        return `还差￥${(nextTouchPrice - allPrice).toFixed(2)}元可用“满${nextTouchPrice}元减${nextCouponAmount}元”优惠券`
    }

    // 全部同时有时
    if (currentCoupon && nextCoupon) {
        const { couponAmount: currentCouponAmount, touchPrice: currentTouchPrice } = currentCoupon
        const { couponAmount: nextCouponAmount, touchPrice: nextTouchPrice } = nextCoupon
        return `还差￥${(nextTouchPrice - allPrice).toFixed(2)}元可用“满${nextTouchPrice}元减${nextCouponAmount}元”优惠券`
    }

}