import core from "@nestia/core";
import {
  Controller,
  NotFoundException,
  UnprocessableEntityException,
} from "@nestjs/common";
import { ITossCashReceipt } from "toss-payments-server-api/lib/structures/ITossCashReceipt";
import { ITossPayment } from "toss-payments-server-api/lib/structures/ITossPayment";
import { v4 } from "uuid";

import { FakeTossUserAuth } from "../decorators/FakeTossUserAuth";
import { FakeTossStorage } from "../providers/FakeTossStorage";

@Controller("v1/cash-receipts")
export class FakeTossCashReceiptsController {
  /**
   * 현금 영수증 발행하기.
   *
   * @param input 입력 정보
   * @returns 현금 영수증 정보
   *
   * @security basic
   * @author Samchon
   */
  @core.TypedRoute.Post()
  public create(
    @FakeTossUserAuth() _0: void,
    @core.TypedBody() input: ITossCashReceipt.ICreate,
  ): ITossCashReceipt {
    // CHECK PAYMENT
    const payment: ITossPayment = FakeTossStorage.payments.get(
      input.paymentKey,
    );
    if (payment.orderId !== input.orderId)
      throw new NotFoundException("Wrong orderId");
    else if (payment.cashReceipt !== null)
      throw new UnprocessableEntityException("Duplicated cash receipt exists.");
    else if (payment.totalAmount < input.amount)
      throw new UnprocessableEntityException(
        "Input amount is greater than its payment.",
      );

    // CONSTRUCT
    const receipt: ITossCashReceipt = {
      orderId: input.orderId,
      orderName: input.orderName,
      type: input.type,
      receiptKey: v4(),
      approvalNumber: v4(),
      approvedAt: new Date().toISOString(),
      canceledAt: null,
      receiptUrl: "https://github.com/samchon/fake-toss-payments-server",
      __paymentKey: payment.paymentKey,
    };
    FakeTossStorage.cash_receipts.set(receipt.receiptKey, receipt);
    payment.cashReceipt = {
      type: receipt.type,
      amount: input.amount,
      taxFreeAmount: input.taxFreeAmount || 0,
      issueNumber: receipt.approvalNumber,
      receiptUrl: receipt.receiptUrl,
    };

    // RETURNS
    return receipt;
  }

  /**
   * 현금 영수증 취소하기.
   *
   * @param receiptKey 현금 영수증의 {@link ITossCashReceipt.receiptKey}
   * @param input 취소 입력 정보
   * @returns 취소된 현금 영수증 정보
   *
   * @security basic
   * @author Samchon
   */
  @core.TypedRoute.Post(":receiptKey/cancel")
  public cancel(
    @FakeTossUserAuth() _0: void,
    @core.TypedParam("receiptKey") receiptKey: string,
    @core.TypedBody() input: ITossCashReceipt.ICancel,
  ): ITossCashReceipt {
    input;

    // GET RECORDS
    const receipt: ITossCashReceipt =
      FakeTossStorage.cash_receipts.get(receiptKey);
    const payment: ITossPayment = FakeTossStorage.payments.get(
      receipt.__paymentKey,
    );

    // CHANGE
    receipt.canceledAt = new Date().toISOString();
    payment.cashReceipt = null;

    return receipt;
  }
}