import { IGood, InvoiceControllerState, LineAttributeType } from '..';
import { format15 } from '../../tools/calculate';
import { chain, bignumber } from 'mathjs';
import idGenerator from '../../tools/idGenerator';

export default async function mergeDiscount(state: InvoiceControllerState) {
    if (state.goodsListState.goodsList.length <= 1 || state.goodsListState.editGood) return;

    const goodsList = state.goodsListState.goodsList.slice();
    for (let i = 0; i < goodsList.length; i++) {
        const good = goodsList[i];
        if (good.lineAttribute * 1 === LineAttributeType.被折扣行) {
            const sum: IGood = { ...good, $index: idGenerator(), lineAttribute: LineAttributeType.正常, discountGroup: undefined };
            const zk = goodsList[i + 1];

            sum.lineAmountExcludeTax = chain(bignumber(good.lineAmountExcludeTax)).subtract(bignumber(Math.abs(zk.lineAmountExcludeTax || 0))).done().toNumber();
            sum.lineAmountIncludeTax = chain(bignumber(good.lineAmountIncludeTax)).subtract(bignumber(Math.abs(zk.lineAmountIncludeTax || 0))).done().toNumber();
            sum.taxAmount = chain(bignumber(sum.lineAmountIncludeTax)).subtract(bignumber(sum.lineAmountExcludeTax)).done().toNumber();
            sum.quantity = good.quantity;
            if (sum.quantity) {
                const calculatingDigits = state.calculatingDigits;
                sum.priceExcludeTax = format15(chain(bignumber(sum.lineAmountExcludeTax)).divide(bignumber(sum.quantity)).done().toNumber(), calculatingDigits) || 0;
                sum.priceIncludeTax = format15(chain(bignumber(sum.lineAmountIncludeTax)).divide(bignumber(sum.quantity)).done().toNumber(), calculatingDigits) || 0;
            }
            
            if (sum.lineAmountIncludeTax === 0) {
                goodsList.splice(i, 2); i--;
            } else {
                goodsList.splice(i, 2, sum);
            }
        }
    }
    state.goodsListState.goodsList = goodsList;
}