/**
 * 购物车模型 model
 * @author: jinhu.dong<jinhu.dong@yoho.cn>
 * @date: 2016/07/04
 */
'use strict';

var _ = require('lodash');

const api = global.yoho.API;

/*
 * 加入购物车
 * @function addToCart
 * @param { String } productSku 商品SKU
 * @param { Number } buyNumber 购买商品数量
 * @param { Number } goodType 商品类型，0表示普通商品，1表示加价购商品
 * @param { Number } isEdit 是否是编辑商品SKU，0表示不是编辑
 * @param { Number } uid 用户UID，可以不传
 * @param { String } shoppingKey 未登录用户唯一识别码，可以不传
 * @return { Array } 加入购物车接口返回的数据
 */
const addToCart = (options) => {
    const productSku = options.productSku;
    const buyNumber = options.buyNumber;
    const goodType = options.goodType || 0;
    const isEdit = options.isEdit || 0;
    const uid = options.uid;
    const shoppingKey = options.shoppingKey;

    let params = {
        method: 'app.Shopping.add',
        product_sku: productSku,
        buy_number: buyNumber,
        goods_type: goodType,
        edit_product_sku: isEdit,
        selected: 'Y',
        promotion_id: null
    };

    if (uid) {
        _.merge(params, {
            uid: uid
        });
    }

    if (shoppingKey) {
        _.merge(params, {
            shopping_key: shoppingKey
        });
    }

    return api.get('', params);
};

/*
 * 获取购物车数据
 * @function getCartData
 * @param { Number } uid 用户UID，可以不传
 * @param { String } shoppingKey 未登录用户唯一识别码，客户端从cookie中获取
 * @return { Object }
 * {
 *     advance_cart_data: {                  // 预售商品
 *         gift_list: [],                    // 赠品
 *         goods_list: []                    // 商品列表
 *         off_shelves_goods_list: [],       // 下架商品, 失效商品
 *         price_gift: [],                   // 加价购商品
 *         promotion_info: [],               // 促销信息
 *         shopping_cart_data: [],           // 商品价格计算相关信息
 *         sold_out_goods_list: []           // 售罄商品
 *     },
 *     ordinary_cart_data: {                 // 普通商品
 *         gift_list: [],
 *         goods_list: [],
 *         off_shelves_goods_list: [],
 *         price_gift: [],
 *         promotion_info: [],
 *         shopping_cart_data: [],
 *         sold_out_goods_list: []
 *     },
 *     md5: '...',
 *     message: '...'
 * }
 */
const getCartData = (shoppingKey, uid) => {
    let params = {
        method: 'app.Shopping.cart'
    };

    if (shoppingKey) {
        _.merge(params, {
            shopping_key: shoppingKey
        });
    }

    if (uid) {
        _.merge(params, {
            uid: uid
        });
    }

    return api.get('', params);
};

/*
 * 移入收藏夹
 * @function transferToFavorite
 * @param { Number } uid 用户UID
 * @param { String } sku 商品sku列表
 * @param { Boolean } hasPromotion 是否有促销ID, 默认值是false
 * @return { Array }
 */
const transferToFavorite = (params) => {
    let method = 'app.Shopping.addfavoriteAndCart';

    _.merge(params, {method});
    return api.get('', params);
};

/*
 * 商品选择与取消选择
 * @function toggleSelectGoods
 * @param { Number } uid 用户UID
 * @param { String } sku 商品sku列表
 * @param { String } shoppingKey 未登录用户唯一识别码，可以不传
 * @return { Array }
 */
const toggleSelectGoods = (params) => {
    // BLK 没有促销, 新接口
    let method = 'app.Shopping.selectedAndCart';

    _.merge(params, {method});

    /*
    let resultData;
    let skus = JSON.parse(params.product_sku_list).map(sku => return sku.product_sku);
    const skusLen = skus.length;

    _.merge(params, {method});

    return getCartData(params.shopping_key, params.uid).then(function(result) {
        // 检查库存量
        resultData = result.data;

        _.find(
            _.concat(resultData.ordinary_cart_data.goods_list, resultData.advance_cart_data.goods_list),
            (goodItem) => {
                if (skusLen == 1 && goodItem.product_sku === skus[0] &&
                    (parseInt(goodItem.buy_number, 10) > parseInt(goodItem.storage_number, 10))) {
                    // 单个商品
                    return {
                        code: '1000',
                        message: '您勾选的商品库存不足'
                    };
                } else {
                    if((parseInt(goodItem.buy_number, 10) > parseInt(goodItem.storage_number, 10))) {
                        // 全选
                        return api.get('', params).then(result => {
                            return _.merge(result, {
                                code: '1001',
                                message: '您全选的商品中存在库存不足商品，已帮您自动取消勾选'
                            })
                        });
                    }
                }
        });
    });
    */
    return api.get('', params);
};

/*
 * 删除商品
 * @function removeGoods
 * @param { Number } uid 用户UID
 * @param { String } sku 商品sku列表
 * @param { String } shoppingKey 未登录用户唯一识别码，可以不传
 * @return { Array }
 */
const removeGoods = (params) => {
    // BLK 没有促销, 新接口
    let method = 'app.Shopping.removeAndCart';

    _.merge(params, {method});
    return api.get('', params);
};

/*
 * 每次操作处理购物车数据
 * @function filterCartData
 * @param { Object } result 购物车数据
 * {
 *     advance_cart_data: {                  // 预售商品
 *         gift_list: [],                    // 赠品
 *         goods_list: []                    // 商品列表
 *         off_shelves_goods_list: [],       // 下架商品, 失效商品
 *         price_gift: [],                   // 加价购商品
 *         promotion_info: [],               // 促销信息
 *         shopping_cart_data: [],           // 商品价格计算相关信息
 *         sold_out_goods_list: []           // 售罄商品
 *     },
 *     ordinary_cart_data: {                 // 普通商品
 *         gift_list: [],
 *         goods_list: [],
 *         off_shelves_goods_list: [],
 *         price_gift: [],
 *         promotion_info: [],
 *         shopping_cart_data: [],
 *         sold_out_goods_list: []
 *     },
 *     md5: '...',
 *     message: '...'
 * }
 */
const filterCartData = (result, uid) => {
    // 预售商品
    let advancedGoods = [],
        selectedAdvanceNum = 0,
        totalAdvanceMoney,
        advancedCartData;

    // 普通商品
    let ordinaryGoods = [],
        selectedOrdinaryNum = 0,
        totalOrdinaryMoney,
        ordinaryCartData;

    // skn=0或者已下架的商品，定义为失效商品
    let invalidGoods = [];

    // 库存不足商品
    // 售罄商品当作一般商品处理
    let advancedSoldOutGoods = [];

    // 商品总数量
    let buyNumber;
    let storageNumber;
    let totalNum = 0;
    let noStorage = [];

    // 返回值
    let resData = {
        loggedIn: uid
    };

    // 预售商品
    if (result.data && result.data.advance_cart_data) {
        advancedCartData = result.data.advance_cart_data;
        totalAdvanceMoney = advancedCartData.shopping_cart_data.last_order_amount;
        advancedGoods = _.concat(advancedGoods, advancedCartData.goods_list);
        invalidGoods = _.concat(invalidGoods, advancedCartData.off_shelves_goods_list);
        advancedSoldOutGoods = _.concat(advancedSoldOutGoods, advancedCartData.sold_out_goods_list);

        _.forEach(advancedGoods, function(good) {
            buyNumber = parseInt(good.buy_number, 10);
            storageNumber = parseInt(good.storage_number, 10);
            totalNum += buyNumber;
            _.merge(good, {
                left_number: storageNumber - buyNumber
            });
            if (good.selected === 'Y') {
                selectedAdvanceNum += buyNumber;
                if (storageNumber < buyNumber) {
                    noStorage.push(good.product_name);
                }
            }
        });
    }

    // 普通商品
    if (result.data && result.data.ordinary_cart_data) {
        ordinaryCartData = result.data.ordinary_cart_data;
        totalOrdinaryMoney = ordinaryCartData.shopping_cart_data.last_order_amount;

        // 正常商品+库存不足商品
        ordinaryGoods = _.concat(ordinaryGoods, ordinaryCartData.goods_list, ordinaryCartData.sold_out_goods_list);

        // 失效商品
        invalidGoods = ordinaryCartData.off_shelves_goods_list;

        _.forEach(ordinaryGoods, good => {
            buyNumber = parseInt(good.buy_number, 10);
            storageNumber = parseInt(good.storage_number, 10);
            totalNum += buyNumber;
            _.merge(good, {
                left_number: storageNumber - buyNumber
            });

            if (good.selected === 'Y') {
                selectedOrdinaryNum += buyNumber;
                if (storageNumber < buyNumber) {
                    noStorage.push(good.product_name);
                }
            }
        });
    }

    let freeShippingTip = '';

    if (_.has(result, 'data.ordinary_cart_data.promotion_info')) {
        let promotions = result.data.ordinary_cart_data.promotion_info;

        let promotion = _.find(promotions, p => {
            return p.promotion_type === 'FreeShippingCost';
        });

        if (promotion) {
            freeShippingTip = promotion.promotion_title;
        }
    }

    return _.merge(resData, {
        hasGoods: advancedGoods.length || ordinaryGoods.length || invalidGoods.length,
        preSalePros: (advancedSoldOutGoods.length || advancedGoods.length) ?
                     _.concat(advancedGoods, advancedSoldOutGoods) : [],
        commonPros: ordinaryGoods,
        invalidPros: invalidGoods,
        selectedNum: selectedAdvanceNum + selectedOrdinaryNum,
        checkAll: totalNum === (selectedAdvanceNum + selectedOrdinaryNum),
        totalMoney: totalAdvanceMoney + totalOrdinaryMoney,
        freeShippingTip: freeShippingTip,
        noStorage
    });
};

/**
 * 修改购物车商品数量
 * @function modifyProductNum
 * @param { Number } uid 用户ID
 * @param { String } sku 商品SKU
 * @param { Number } increaseNum 增加的数目
 * @param { Number } decreaseNum 减少的数目
 * @param { String } shoppingKey 未登录用户唯一识别码
 * @return { Array } 接口返回单个商品的增减数据
 */
const modifyProductNum = (options) => {
    const increaseNum = options.increaseNum;
    const decreaseNum = options.decreaseNum;
    const uid = options.uid;
    const shoppingKey = options.shoppingKey;
    const sku = options.sku;
    const goodType = options.goodTpye;

    let buyNumber,
        storageNumber;

    let params = {
        product_sku: options.sku
    };

    // 减少到库存范围内，自动勾选
    // let selectedParams;

    // 增加
    if (increaseNum) {
        _.merge(params, {
            method: 'app.Shopping.increase',
            increase_number: parseInt(increaseNum, 10)
        });
    }

    // 减少
    if (decreaseNum) {
        _.merge(params, {
            method: 'app.Shopping.decrease',
            decrease_number: parseInt(decreaseNum, 10)
        });
    }

    if (uid) {
        _.merge(params, {uid});
    }

    if (shoppingKey) {
        _.merge(params, {
            shopping_key: shoppingKey
        });
    }

    _.merge(params, {
        product_sku: sku
    });

    return getCartData(shoppingKey, uid).then(function(result) {
        if (goodType === 'advance') {
            // 检查库存量
            // 同步
            _.find(result.data.advance_cart_data.goods_list, (goodItem) => {
                if (goodItem.product_sku === sku) {
                    buyNumber = parseInt(goodItem.buy_number, 10);
                    storageNumber = parseInt(goodItem.storage_number, 10);

                    // 计算剩余多少
                    _.merge(goodItem, {
                        left_number: storageNumber - buyNumber
                    });

                    // 减少到库存范围内，自动勾选
                    // if(decreaseNum && buyNumber <= storageNumber) {
                    //     selectedParams = {
                    //         product_sku_list: JSON.stringify([{
                    //             "goods_type": "ordinary",
                    //             "buy_number": buyNumber,
                    //             "selected": "Y",
                    //             "product_sku": sku,
                    //             "promotion_id": 0
                    //         }]),
                    //         uid: uid,
                    //         shopping_key: shoppingKey
                    //     };
                    // }
                }
            });
        } else if (goodType === 'ordinary') {
            // 检查库存量
            // 同步
            _.find(result.data.ordinary_cart_data.goods_list, (goodItem) => {
                if (goodItem.product_sku === sku) {
                    buyNumber = parseInt(goodItem.buy_number, 10);
                    storageNumber = parseInt(goodItem.storage_number, 10);

                    // 计算剩余多少
                    _.merge(goodItem, {
                        left_number: storageNumber - buyNumber
                    });

                    // 减少到库存范围内，自动勾选
                    // if(decreaseNum && buyNumber <= storageNumber) {
                    //     selectedParams = {
                    //         product_sku_list: JSON.stringify([{
                    //             "goods_type": "ordinary",
                    //             "buy_number": buyNumber,
                    //             "selected": "Y",
                    //             "product_sku": sku,
                    //             "promotion_id": 0
                    //         }]),
                    //         uid: uid,
                    //         shopping_key: shoppingKey
                    //     };
                    // }
                }
            });
        }

        // 异步
        return api.get('', params);
    });
};

/**
 * 修改商品颜色和尺寸
 * @function modifyProduct
 * @param { Number } uid 用户ID
 * @param { String } swapData 商品修改信息
 * @param { String } shoppingKey 未登录用户唯一识别码
 * @return { Object } 接口返回单个商品修改结果
 */
const modifyProduct = (options) => {
    let params = {
        method: 'app.Shopping.swap'
    };

    _.merge(params, {
        swap_data: options.swapData
    });

    if (options.uid) {
        _.merge(params, {
            uid: options.uid
        });
    }

    if (options.shoppingKey) {
        _.merge(params, {
            shopping_key: options.shoppingKey
        });
    }

    return api.get('', params);
};

module.exports = {
    addToCart,
    getCartData,
    transferToFavorite,
    toggleSelectGoods,
    removeGoods,
    filterCartData,
    modifyProductNum,
    modifyProduct
};