tplus-pos/dist/domain/retail/originalReturn/ReturnCouponProcessor.js

pos module

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.ReturnCouponProcessor = undefined;

var _classCallCheck2 = require('babel-runtime/helpers/classCallCheck');

var _classCallCheck3 = _interopRequireDefault(_classCallCheck2);

var _createClass2 = require('babel-runtime/helpers/createClass');

var _createClass3 = _interopRequireDefault(_createClass2);

var _Enum = require('../../../commom/Enum');

var _Format = require('../../../commom/Format');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
*退代金券算法
* @export
* @class ReturnCouponProcessor
* @auther tuzha
*/
var ReturnCouponProcessor = exports.ReturnCouponProcessor = function () {
    function ReturnCouponProcessor() {
        (0, _classCallCheck3.default)(this, ReturnCouponProcessor);
    }

    (0, _createClass3.default)(ReturnCouponProcessor, null, [{
        key: 'execute',
        value: function execute(dto) {
            //没有代金券可以退回或者退款小于任何的优惠券值
            if (!dto.RetailCouponDetails || dto.RetailCouponDetails.length == 0 || dto.RetailCouponDetails.findIndex(function (it) {
                return it.ReductionAmount <= -dto.TotalTaxAmount;
            }) < 0) {
                var findIndex = dto.RetailPaymentDetails.findIndex(function (it) {
                    return it.SettleStyle.Code == _Enum.SettleCode.Coupon;
                });
                dto.RetailPaymentDetails.splice(findIndex, 1);
                return;
            }
            //存在代金券，且可以分配
            var newCouponDetails = this.getCouponDetails(dto.RetailCouponDetails, -dto.TotalTaxAmount);

            if (!newCouponDetails || newCouponDetails.length == 0) {
                var _findIndex = dto.RetailPaymentDetails.findIndex(function (it) {
                    return it.SettleStyle.Code == _Enum.SettleCode.Coupon;
                });
                dto.RetailPaymentDetails.splice(_findIndex, 1);
                return;
            }

            //开始赋值
            dto.RetailCouponDetails = [];
            newCouponDetails.forEach(function (item) {
                item.ReductionAmount = -item.ReductionAmount;
                dto.RetailCouponDetails.push(item);
            });

            //排序处理 
            dto.RetailCouponDetails = dto.RetailCouponDetails.sort(function (a, b) {
                if (b.ReductionAmount == a.ReductionAmount) {
                    if (b.CouponTitle > a.CouponTitle) {
                        return 1;
                    } else if (b.CouponTitle < a.CouponTitle) {
                        return -1;
                    } else {
                        return 0;
                    }
                } else {
                    return Math.abs(b.ReductionAmount) - Math.abs(a.ReductionAmount);
                }
            });

            var totalCouponAmount = dto.RetailCouponDetails.Sum("ReductionAmount");
            //对代金券赋值
            var paymentDetailDto = dto.RetailPaymentDetails.find(function (it) {
                return it.SettleStyle.Code == _Enum.SettleCode.Coupon;
            });
            var _format = new _Format.Format();
            paymentDetailDto.Amount = totalCouponAmount;
            paymentDetailDto.OrigAmount = _format.FormatAmount(Math.Multiply(paymentDetailDto.Amount, paymentDetailDto.ExchangeRate));
            JSON.setCellValue(dto, "TotalCanReturnAmount", Math.Minus(-dto.TotalTaxAmount, -totalCouponAmount));
        }
        //回溯查找代金券明细

    }, {
        key: 'findCouponDetails',
        value: function findCouponDetails(retailCouponDetails, begin, targetAmount, newCouponDetails, newCouponDetailsList) {
            if (targetAmount == 0 || begin >= retailCouponDetails.length) {
                var info = {};
                info.TargetAmount = targetAmount;
                info.CouponDetails = JSON.Clone(newCouponDetails);
                newCouponDetailsList.push(info);
                return true;
            }
            if (targetAmount < 0) {
                return true;
            }

            for (var index = begin; index < retailCouponDetails.length; index++) {
                // 为了避免将负数传递到下一个分支，这里剪枝
                if (targetAmount - retailCouponDetails[index].ReductionAmount < 0 && newCouponDetails.length > 0) {
                    var _info = {};
                    _info.TargetAmount = targetAmount;
                    _info.CouponDetails = JSON.Clone(newCouponDetails);
                    newCouponDetailsList.push(_info);
                    continue;
                }
                if (targetAmount - retailCouponDetails[index].ReductionAmount < 0 && newCouponDetails.length == 0) {
                    continue;
                }
                // 这一步之所以能够生效，其前提是数组一定是排好序的，这样才能保证：
                // 在递归调用的统一深度（层）中，一个元素只使用一次。
                // 这一步剪枝操作基于 retailCouponDetails 数组是排序数组的前提下,相同部分剪枝
                if (index > begin && retailCouponDetails[index].ReductionAmount == retailCouponDetails[index - 1].ReductionAmount) {
                    continue;
                }
                newCouponDetails.push(retailCouponDetails[index]);
                // 【关键】因为元素不可以重复使用，这里递归传递下去的是 index + 1 而不是 index
                var isFind = this.findCouponDetails(retailCouponDetails, index + 1, targetAmount - retailCouponDetails[index].ReductionAmount, newCouponDetails, newCouponDetailsList);
                if (isFind) {
                    break;
                }
                newCouponDetails.pop();
            }
        }
        //获取代金券明细

    }, {
        key: 'getCouponDetails',
        value: function getCouponDetails(retailCouponDetails, targetAmount) {
            var totalCouponAmount = retailCouponDetails.Sum("ReductionAmount");
            //如果代金券的总金额小于退款总金额，则全部分配
            if (targetAmount > totalCouponAmount) {
                return retailCouponDetails;
            }
            var newCouponDetails = [];
            var newCouponDetailsList = [];
            //按照代金券金额倒序
            retailCouponDetails = retailCouponDetails.sort(function (a, b) {
                return b.ReductionAmount - a.ReductionAmount;
            });
            this.findCouponDetails(retailCouponDetails, 0, targetAmount, newCouponDetails, newCouponDetailsList);
            if (newCouponDetailsList.length > 0) {
                newCouponDetailsList = newCouponDetailsList.sort(function (a, b) {
                    return Math.abs(a.TargetAmount) - Math.abs(b.TargetAmount);
                });
                newCouponDetails = newCouponDetailsList[0].CouponDetails;
            }
            return newCouponDetails;
        }
    }]);
    return ReturnCouponProcessor;
}();
//# sourceMappingURL=ReturnCouponProcessor.js.map