import type { Currency } from '../../../shared/enums.js';
import type { IGetTransactionsByIdsResult } from '../types.js';
import { isTransactionsValid } from './validation.helper.js';

export function getTransactionsMeta(transactions: IGetTransactionsByIdsResult[]) {
  let transactionsAmount: number | null = null;
  const currenciesSet = new Set<Currency>();
  let invalidTransactions = false;
  let transactionsMinDebitDate: Date | null = null;
  let transactionsMinEventDate: Date | null = null;
  let transactionsMaxDebitDate: Date | null = null;
  let transactionsMaxEventDate: Date | null = null;

  const hasFee = transactions.some(t => t.is_fee);
  const onlyFee = transactions.every(t => t.is_fee);
  const hasSomeFeeTransactions = hasFee && !onlyFee;

  transactions.map(t => {
    if ((hasSomeFeeTransactions && !t.is_fee) || !hasSomeFeeTransactions) {
      const amountAsNumber = Number(t.amount);
      const amount = Number.isNaN(amountAsNumber) ? null : amountAsNumber;
      if (amount != null) {
        transactionsAmount ??= 0;
        transactionsAmount += amount;
        currenciesSet.add(t.currency as Currency);
      }
    }
    if (t.debit_timestamp) {
      transactionsMinDebitDate ??= t.debit_timestamp;
      if (transactionsMinDebitDate > t.debit_timestamp) {
        transactionsMinDebitDate = t.debit_timestamp;
      }

      transactionsMaxDebitDate ??= t.debit_timestamp;
      if (transactionsMaxDebitDate < t.debit_timestamp) {
        transactionsMaxDebitDate = t.debit_timestamp;
      }
    } else if (t.debit_date) {
      transactionsMinDebitDate ??= t.debit_date;
      if (transactionsMinDebitDate > t.debit_date) {
        transactionsMinDebitDate = t.debit_date;
      }

      transactionsMaxDebitDate ??= t.debit_date;
      if (transactionsMaxDebitDate < t.debit_date) {
        transactionsMaxDebitDate = t.debit_date;
      }
    }

    transactionsMinEventDate ??= t.event_date;
    if (transactionsMinEventDate > t.event_date) {
      transactionsMinEventDate = t.event_date;
    }

    transactionsMaxEventDate ??= t.event_date;
    if (transactionsMaxEventDate < t.event_date) {
      transactionsMaxEventDate = t.event_date;
    }

    if (!isTransactionsValid(t)) {
      invalidTransactions = true;
    }
  });

  const transactionsCurrencies = Array.from(currenciesSet);
  const transactionsCurrency =
    transactionsCurrencies.length === 1 ? transactionsCurrencies[0] : null;

  return {
    transactionsCount: transactions.length,
    transactionsAmount,
    transactionsCurrencies,
    transactionsCurrency,
    invalidTransactions,
    transactionsMinDebitDate,
    transactionsMinEventDate,
    transactionsMaxDebitDate,
    transactionsMaxEventDate,
  };
}