import type { OperationInterval } from './operations/domain/operations-sync-plan';

const JANUARY_INDEX = 0;
const FIRST_DAY_OF_MONTH = 1;
const EXCLUSIVE_END_OFFSET_MS = 1;
const NO_END_OFFSET_MS = 0;

type Account = { accountId: string; openedOn: null | string };

export function accountHistory(
  accounts: Account[],
  now: Date,
): OperationInterval[] {
  return accounts.flatMap((account) => {
    const from = new Date(
      account.openedOn
        ? `${account.openedOn}T00:00:00Z`
        : '1970-01-01T00:00:00Z',
    );
    return from < now ? [{ accountId: account.accountId, from, to: now }] : [];
  });
}

export function ledgerRange(
  fromValue: string | undefined,
  toValue: string | undefined,
  instrumentUid: string | undefined,
  accounts: Account[],
  now: Date,
) {
  const opening = accounts.every((account) => account.openedOn)
    // eslint-disable-next-line sonarjs/no-alphabetical-sort -- Code-unit ordering is intentional for canonical keys and ISO dates; locale collation would change persisted bindings.
    ? accounts.map((account) => account.openedOn ?? '').sort()[0]
    : undefined;
  const from = fromValue
    ? new Date(fromValue)
    : instrumentUid
      ? new Date(opening ? `${opening}T00:00:00Z` : '1970-01-01T00:00:00Z')
      : new Date(Date.UTC(now.getUTCFullYear(), JANUARY_INDEX, FIRST_DAY_OF_MONTH));
  const end = toValue
    ? new Date(
        /^\d{4}-\d{2}-\d{2}$/.test(toValue)
          ? `${toValue}T23:59:59.999Z`
          : toValue,
      )
    : now;
  return {
    from,
    to: new Date(Math.min(end.valueOf() + (toValue ? EXCLUSIVE_END_OFFSET_MS : NO_END_OFFSET_MS), now.valueOf())),
  };
}