'use strict';

/**
 *
 *
 * @author Mai
 * @date
 * @version
 */

const math = require('mathjs');
math.config({
    number: 'BigNumber',
});
const PayConst = require('../const/deal_pay.js');
const payType = PayConst.payType;
const deadlineType = PayConst.deadlineType;

class PayCalculate {
    constructor (ctx, stage, tenderInfo) {
        this.ctx = ctx;
        this.stage = stage;
        this.percentReg = /((\d+)|((\d+)(\.\d+)))%/g;
        this.tenderInfo = tenderInfo;
        this.decimal = tenderInfo.decimal.pay ? tenderInfo.decimal.payTp : tenderInfo.decimal.tp;
        /* 以下变量在调用calculate方法后获得
        this.add;
        this.pre;
        this.cur;
        this.yf;
         */
    }

    /**
     * 获取 计算基数
     * @returns {Promise<void>}
     */
    async getCalcBase () {
        if (this.bases) { return; }
        const bases = await this.ctx.service.stage.getStagePayCalcBase(this.stage, this.tenderInfo);
        this.bases = bases.sort(function (a, b) {
            return a.sort - b.sort;
            // if (a && b) {
            //     return b.code.indexOf(a.code) >= 0 ? 1 : 0;
            // } else {
            //     return 0;
            // }
        });
        for (const b of this.bases) {
            b.reg = new RegExp(b.code, 'igm');
        }
    }

    _calculateTpExpr(pay) {
        let formula = pay.expr;
        for (const b of this.bases) {
            if ((b.code === 'bqwc' || b.code === 'bqht') && (!pay.pre_used && pay.sprice)) {
                switch (b.code) {
                    case 'bqwc':
                        formula = formula.replace(b.reg, this.ctx.helper.sub(this.add.gather_tp, pay.sprice));
                        break;
                    case 'bqht':
                        formula = formula.replace(b.reg, this.ctx.helper.sub(this.add.contract_tp, pay.sprice));
                        break;
                }
            } else {
                formula = formula.replace(b.reg, b.value);
            }
        }
        const percent = formula.match(this.percentReg);
        if (percent) {
            for (const p of percent) {
                const v = math.eval(p.replace('%', '/100'));
                formula = formula.replace(p, v);
            }
        }
        try {
            // 使用mathjs计算 math.eval('17259401.95*0.9') = 15533461.754999999，正确应为 15533461.755
            // const value = math.eval(formula);
            // 使用逆波兰法四则运算，可防止出现误差，但是只支持四则运算，不支持科学运算
            // const value = this.ctx.helper.calcExprStrRpn(formula);
            // 使用mathjs的大数运算，可支持所有
            const value = parseFloat(math.eval(formula));
            return value;
        } catch(err) {
            return 0;
        }
    }

    _calculateExpr(expr) {
        let formula = expr;
        for (const b of this.bases) {
            formula = formula.replace(b.reg, b.value ? b.value : 0);
        }
        const percent = formula.match(this.percentReg);
        if (percent) {
            for (const p of percent) {
                const v = math.eval(p.replace('%', '/100'));
                formula = formula.replace(p, v);
            }
        }
        try {
            // 使用mathjs计算 math.eval('17259401.95*0.9') = 15533461.754999999，正确应为 15533461.755
            // const value = math.eval(formula);
            // 使用逆波兰法四则运算，可防止出现误差，但是只支持四则运算，不支持科学运算
            // const value = this.ctx.helper.calcExprStrRpn(formula);
            // 使用mathjs的大数运算，可支持所有
            const value = parseFloat(math.eval(formula));
            return value;
        } catch(err) {
            return 0;
        }
    }

    /**
     * 计算起扣金额、付(扣)款限额
     *
     * @param {Array} pays - （标段）合同支付数据
     */
    async calculateStartRangePrice (pays) {
        const order = this.stage.curOrder;
        for (const p of pays) {
            // 非本期，本次添加的合同支付项，不允许计算，其中默认添加的合同支付项，归属于第一期原报
            if (p.csorder === this.stage.order || (p.csorder === 0 || this.stage.order === 1)) {
                if (p.csaorder === order) {
                    if (!p.sprice && p.sexpr && p.sexpr !== '') {
                        p.sprice = this.ctx.helper.round(this._calculateExpr(p.sexpr), this.decimal);
                    } else if (p.sprice && !p.sexpr) {
                        p.sprice = this.ctx.helper.round(p.sprice, this.decimal);
                    }
                    if (!p.rprice && p.rexpr && p.rexpr !== '') {
                        p.rprice = this.ctx.helper.round(this._calculateExpr(p.rexpr), this.decimal);
                    } else if (p.rprice && !p.rexpr) {
                        p.rprice = this.ctx.helper.round(p.rprice, this.decimal);
                    }
                }
            }
        }
    }

    /**
     * 累计 计量等数据
     */
    async _getAddCalcRela() {
        if (this.cur && this.add) return;

        this.pre = this.stage.order > 1 ? await this.ctx.service.stageBillsFinal.getSumTotalPrice(this.stage.tid, this.stage.order - 1) : {};
        this.cur = await this.ctx.service.stageBills.getSumTotalPrice(this.stage);
        this.add = {};
        if (this.pre) {
            this.add.contract_tp = this.ctx.helper.add(this.pre.contract_tp, this.cur.contract_tp);
            this.add.qc_tp = this.ctx.helper.add(this.pre.qc_tp, this.cur.qc_tp);
        } else {
            this.add.contract_tp = this.cur.contract_tp;
            this.add.qc_tp = this.cur.qc_tp;
        }
        this.add.gather_tp = this.ctx.helper.add(this.add.contract_tp, this.add.qc_tp);
    }

    /**
     * 检查是否到达 计提期限
     * @param pay
     */
    _checkDeadline(pay) {
        if (pay.dl_type === deadlineType.tp.value) {
            const deadlineTp = this.add[pay.dl_tp_type + '_tp'];
            if (deadlineTp > pay.dl_tp) {
                return true;
            }
        } else if (pay.dl_type === deadlineType.count.value) {
            return this.stage.order >= pay.dl_count;
        } else {
            return false;
        }
    }

    /**
     * 计算本期、截止本期金额
     * @param {Array} pays - （标段&期）合同支付数据
     */
    async calculate(pays) {
        this.yf = pays.find(function (p) {
            return p.ptype === payType.yf;
        });
        this.sf = pays.find(function (p) {
            return p.ptype === payType.sf;
        });
        if (!this.yf) return false;
        await this._getAddCalcRela();
        this.yf.tp = 0;
        for (const p of pays) {
            if (p.ptype === payType.normal || p.ptype === payType.wc) {
                if (!p.pause && (!p.sprice || this.add.gather_tp >= p.sprice)) {
                    if (p.expr && p.expr !== '') {
                        const value = this.ctx.helper.round(this._calculateTpExpr(p), this.decimal);
                        if (p.rprice) {
                            if (this._checkDeadline(p)) {
                                p.tp = this.ctx.helper.sub(p.rprice, p.pre_tp);
                            } else {
                                p.tp = Math.min(this.ctx.helper.sub(p.rprice, p.pre_tp), value);
                            }
                        } else {
                            p.tp = value;
                        }
                    } else if (p.tp && !this.ctx.helper.checkZero(p.tp)) {
                        if (p.rprice) {
                            if (this._checkDeadline(p)) {
                                p.tp = this.ctx.helper.sub(p.rprice, p.pre_tp);
                            } else {
                                p.tp = Math.min(this.ctx.helper.sub(p.rprice, p.pre_tp), this.ctx.helper.round(p.tp, this.decimal));
                            }
                        } else {
                            p.tp = this.ctx.helper.round(p.tp, this.decimal);
                        }
                    } else {
                        if (p.rprice) {
                            if (this._checkDeadline(p)) {
                                p.tp = this.ctx.helper.sub(p.rprice, p.pre_tp);
                            }
                        }
                    }
                } else {
                    p.tp = 0;
                }
                // 累加 至 应付
                if (p.is_yf) {
                    if (p.minus) {
                        this.yf.tp = this.ctx.helper.sub(this.yf.tp, p.tp);
                    } else {
                        this.yf.tp = this.ctx.helper.add(this.yf.tp, p.tp);
                    }
                }
            }
            p.end_tp = this.ctx.helper.round(this.ctx.helper.add(p.tp, p.pre_tp), this.decimal);
        }
        this.yf.end_tp = this.ctx.helper.add(this.yf.tp, this.yf.pre_tp);
        const bqyf = this.bases.find(function (x) {return x.code === 'bqyf'});
        if (bqyf) {
            bqyf.value = this.yf.tp;
        }
        if (this.sf.expr === null || this.sf.expr === '') {
            if (this.sf.rprice) {
                this.sf.tp = Math.min(this.ctx.helper.sub(this.sf.rprice, this.sf.pre_tp), this.yf.tp);
            } else {
                this.sf.tp = this.yf.tp;
            }
        } else {
            const value = this.ctx.helper.round(this._calculateTpExpr(this.sf), this.decimal);
            if (this.sf.rprice) {
                this.sf.tp = Math.min(this.ctx.helper.sub(this.sf.rprice, this.sf.pre_tp), value);
            } else {
                this.sf.tp = this.ctx.helper.round(value, this.decimal);
            }
        }
        this.sf.end_tp = this.ctx.helper.add(this.sf.tp, this.sf.pre_tp);
    }

    async calculateAll(pays) {
        await this.getCalcBase();
        await this._getAddCalcRela();
        await this.calculateStartRangePrice(pays);
        await this.calculate(pays);
    }
}

module.exports = PayCalculate;