refactor: organize backend by business responsibility
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@@ -0,0 +1,339 @@
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import { GoneException, Injectable } from '@nestjs/common';
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import {
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BankCardOperation,
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Prisma,
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} from '../../../../../generated/prisma/client';
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import { PrismaService } from '../../../../prisma/prisma.service';
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import {
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BankOperationDto,
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BankOperationsQueryDto,
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BankPageQueryDto,
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CreateBankOperationDto,
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UpdateBankOperationDto,
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} from '../presentation/bank-card.dto';
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import { rubMoney } from '../domain/rub-money';
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import {
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conflict,
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currentDate,
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fail,
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fingerprint,
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missing,
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operationInput,
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periodBounds,
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} from './bank-card-input';
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import { BankCardsRepository } from '../infrastructure/bank-cards.repository';
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type Tx = Prisma.TransactionClient;
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@Injectable()
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export class BankOperationsService {
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constructor(
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private readonly prisma: PrismaService,
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private readonly repository: BankCardsRepository,
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) {}
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private async operationView(
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tx: Tx,
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row: BankCardOperation,
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): Promise<BankOperationDto> {
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const card = await this.repository.card(tx, row.userId, row.cardId);
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const target = row.targetCardId
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? await this.repository.card(tx, row.userId, row.targetCardId)
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: null;
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const source = row.originalExpenseId
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? await this.repository.operation(tx, row.userId, row.originalExpenseId)
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: null;
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const categoryId = source?.categoryId ?? row.categoryId;
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const category = categoryId
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? await tx.expenseCategory.findFirst({
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where: { id: categoryId, userId: row.userId },
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})
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: null;
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const refunds =
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row.kind === 'expense' || source
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? await tx.bankCardOperation.findMany({
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where: {
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userId: row.userId,
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originalExpenseId: source?.id ?? row.id,
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deletedAt: null,
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...(source ? { id: { not: row.id } } : {}),
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},
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})
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: [];
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return {
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id: row.id,
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kind: row.kind as BankOperationDto['kind'],
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cardId: row.cardId,
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cardName: card.name,
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targetCardId: row.targetCardId,
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targetCardName: target?.name ?? null,
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categoryId,
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categoryName: category?.name ?? null,
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originalExpenseId: row.originalExpenseId,
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amount: rubMoney(row.amountKopecks),
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availableRefund:
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row.kind === 'expense' || source
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? rubMoney(
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(source?.amountKopecks ?? row.amountKopecks) -
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refunds.reduce((sum, r) => sum + r.amountKopecks, 0n),
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)
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: null,
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date: row.date,
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description: row.description,
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version: row.version,
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createdAt: row.createdAt.toISOString(),
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};
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}
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private async validateOperation(
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tx: Tx,
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userId: string,
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input: ReturnType<typeof operationInput>,
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old?: BankCardOperation,
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) {
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const cards = new Set(
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[input.cardId, input.targetCardId, old?.cardId, old?.targetCardId].filter(
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(id): id is string => Boolean(id),
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),
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);
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currentDate(input.date);
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for (const id of cards) {
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const card = await this.repository.card(tx, userId, id, true);
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if (
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(id === input.cardId || id === input.targetCardId) &&
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input.date < card.openingDate
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)
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fail('BANK_INVALID_DATE');
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}
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if (
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old &&
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(old.kind !== input.kind ||
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old.originalExpenseId !== input.originalExpenseId)
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)
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fail('BANK_IMMUTABLE_OPERATION');
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if (input.kind === 'transfer') {
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if (
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!input.targetCardId ||
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input.targetCardId === input.cardId ||
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input.categoryId ||
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input.originalExpenseId
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)
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fail();
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} else if (input.targetCardId) fail();
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if (input.kind === 'expense') {
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if (input.originalExpenseId) fail();
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if (!input.categoryId) {
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const category = await tx.expenseCategory.findUnique({
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where: { userId_seedKey: { userId, seedKey: 'other' } },
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});
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if (!category) missing();
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input.categoryId = category.id;
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}
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if (
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!(await tx.expenseCategory.findFirst({
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where: { userId, id: input.categoryId },
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}))
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)
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missing();
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} else if (input.categoryId) fail();
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if (input.kind !== 'refund' && input.originalExpenseId) fail();
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if (input.kind === 'refund') {
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if (!input.originalExpenseId) fail();
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const source = await this.repository.operation(
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tx,
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userId,
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input.originalExpenseId,
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);
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if (
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source.deletedAt ||
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source.kind !== 'expense' ||
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source.cardId !== input.cardId
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)
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fail('BANK_INVALID_REFUND');
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if (
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(
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await tx.bankCardOperation.updateMany({
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where: {
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id: source.id,
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userId,
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version: source.version,
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deletedAt: null,
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},
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data: { version: { increment: 1 } },
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})
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).count !== 1
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)
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conflict();
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const refunds = await tx.bankCardOperation.findMany({
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where: {
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userId,
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originalExpenseId: source.id,
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deletedAt: null,
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...(old ? { id: { not: old.id } } : {}),
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},
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});
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if (input.date < source.date) fail('BANK_INVALID_DATE');
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if (
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refunds.reduce((sum, r) => sum + r.amountKopecks, 0n) +
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input.amountKopecks >
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source.amountKopecks
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)
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conflict('BANK_REFUND_LIMIT');
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}
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if (old?.kind === 'expense') {
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const refunds = await tx.bankCardOperation.findMany({
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where: { userId, originalExpenseId: old.id, deletedAt: null },
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});
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if (
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refunds.length &&
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(input.cardId !== old.cardId ||
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refunds.some((row) => row.date < input.date) ||
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refunds.reduce((sum, row) => sum + row.amountKopecks, 0n) >
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input.amountKopecks)
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)
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conflict('BANK_DEPENDENT_REFUNDS');
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}
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}
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createOperation(userId: string, dto: CreateBankOperationDto) {
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const normalized = operationInput(dto),
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hash = fingerprint(normalized);
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return this.repository.write(async (tx) => {
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const existing = await tx.bankCardOperation.findUnique({
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where: { id: dto.id },
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});
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if (existing) {
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if (existing.userId !== userId) missing();
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if (existing.createFingerprint !== hash)
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conflict('BANK_INTENT_CONFLICT');
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if (existing.deletedAt)
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throw new GoneException({ code: 'BANK_OPERATION_DELETED' });
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return this.operationView(tx, existing);
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}
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const input = { ...normalized };
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await this.validateOperation(tx, userId, input);
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return this.operationView(
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tx,
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await tx.bankCardOperation.create({
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data: { ...input, id: dto.id, userId, createFingerprint: hash },
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}),
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);
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});
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}
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getOperation(userId: string, id: string) {
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return this.prisma.$transaction(async (tx) => {
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const row = await this.repository.operation(tx, userId, id);
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if (row.deletedAt) missing();
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return this.operationView(tx, row);
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});
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}
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updateOperation(userId: string, id: string, dto: UpdateBankOperationDto) {
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return this.repository.write(async (tx) => {
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const old = await this.repository.operation(tx, userId, id);
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if (old.deletedAt) missing();
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if (old.version !== dto.version) conflict();
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const input = operationInput({
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id,
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kind: dto.kind ?? (old.kind as CreateBankOperationDto['kind']),
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cardId: dto.cardId ?? old.cardId,
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targetCardId: dto.targetCardId ?? old.targetCardId ?? undefined,
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categoryId: dto.categoryId ?? old.categoryId ?? undefined,
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originalExpenseId:
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dto.originalExpenseId ?? old.originalExpenseId ?? undefined,
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amount: dto.amount ?? rubMoney(old.amountKopecks),
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date: dto.date ?? old.date,
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description: dto.description ?? old.description ?? undefined,
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});
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await this.validateOperation(tx, userId, input, old);
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if (
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(
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await tx.bankCardOperation.updateMany({
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where: { id, userId, version: dto.version, deletedAt: null },
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data: { ...input, version: { increment: 1 } },
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})
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).count !== 1
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)
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conflict();
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return this.operationView(
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tx,
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await this.repository.operation(tx, userId, id),
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);
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});
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}
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deleteOperation(userId: string, id: string, version: number) {
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return this.repository.write(async (tx) => {
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const row = await this.repository.operation(tx, userId, id);
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if (row.deletedAt) return;
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if (row.version !== version) conflict();
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await this.repository.card(tx, userId, row.cardId, true);
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if (row.targetCardId)
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await this.repository.card(tx, userId, row.targetCardId, true);
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if (
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row.kind === 'expense' &&
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(await tx.bankCardOperation.findFirst({
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where: { userId, originalExpenseId: id, deletedAt: null },
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}))
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)
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conflict('BANK_DEPENDENT_REFUNDS');
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if (row.originalExpenseId) {
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const source = await this.repository.operation(
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tx,
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userId,
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row.originalExpenseId,
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);
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if (
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(
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await tx.bankCardOperation.updateMany({
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where: { id: source.id, userId, version: source.version },
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data: { version: { increment: 1 } },
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})
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).count !== 1
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)
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conflict();
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}
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if (
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(
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await tx.bankCardOperation.updateMany({
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where: { id, userId, version, deletedAt: null },
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data: { deletedAt: new Date(), version: { increment: 1 } },
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})
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).count !== 1
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)
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conflict();
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});
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}
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history(
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userId: string,
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id: string,
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query: BankOperationsQueryDto | BankPageQueryDto,
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expenses = false,
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) {
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const period = expenses
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? undefined
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: periodBounds(query as BankOperationsQueryDto);
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return this.prisma.$transaction(async (tx) => {
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await this.repository.card(tx, userId, id);
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const page = query.page ?? 1,
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limit = query.limit ?? 50;
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const where: Prisma.BankCardOperationWhereInput = {
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userId,
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deletedAt: null,
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OR: [{ cardId: id }, { targetCardId: id }],
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...(period
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? { date: { gte: period.from, lte: period.to } }
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: { kind: 'expense' }),
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};
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const total = await tx.bankCardOperation.count({ where });
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const rows = await tx.bankCardOperation.findMany({
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where,
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orderBy: [{ date: 'desc' }, { createdAt: 'desc' }, { id: 'desc' }],
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skip: (page - 1) * limit,
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take: limit,
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});
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return {
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items: await Promise.all(
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rows.map((row) => this.operationView(tx, row)),
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),
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total,
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page,
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hasNext: page * limit < total,
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};
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});
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}
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}
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