import { SagaIterator } from 'redux-saga';
import { select, put, takeEvery } from 'redux-saga/effects';
import { isValidAddressLabel } from 'libs/validators';
import { ADDRESS_BOOK_TABLE_ID } from 'components/AddressBookTable';
import { ACCOUNT_ADDRESS_ID } from 'components/BalanceSidebar/AccountAddress';
import {
  TypeKeys,
  ChangeAddressLabelEntry,
  SaveAddressLabelEntry,
  RemoveAddressLabelEntry,
  setAddressLabelEntry,
  setAddressLabel,
  clearAddressLabel,
  clearAddressLabelEntry
} from 'actions/addressBook';
import {
  getAddressLabels,
  getLabelAddresses,
  getAddressLabelEntry,
  getAddressLabelEntryFromAddress,
  getNextAddressLabelId
} from 'selectors/addressBook';
import { showNotification } from 'actions/notifications';

export const ERROR_DURATION: number = 4000;

export function* handleChangeAddressLabelEntry(action: ChangeAddressLabelEntry): SagaIterator {
  const {
    id,
    address: temporaryAddress,
    label: temporaryLabel,
    isEditing,
    overrideValidation
  } = action.payload;
  const addresses = yield select(getAddressLabels);
  const labels = yield select(getLabelAddresses);
  const priorEntry = yield select(getAddressLabelEntry, id);
  const { addressError, labelError } = isValidAddressLabel(
    temporaryAddress,
    temporaryLabel,
    addresses,
    labels
  );
  const updatedEntry = {
    id,
    address: addressError && !isEditing ? priorEntry.address || '' : temporaryAddress,
    temporaryAddress,
    addressError: isEditing || overrideValidation ? undefined : addressError,
    label: labelError ? priorEntry.label || '' : temporaryLabel,
    temporaryLabel,
    labelError: overrideValidation ? undefined : labelError
  };

  return yield put(setAddressLabelEntry(updatedEntry));
}

export function* handleSaveAddressLabelEntry(action: SaveAddressLabelEntry): SagaIterator {
  const id = action.payload;
  const { address, addressError, label, labelError } = yield select(getAddressLabelEntry, id);
  const nextId = yield select(getNextAddressLabelId);
  const flashError = (error: string) => put(showNotification('danger', error, ERROR_DURATION));

  if (addressError) {
    return yield flashError(addressError);
  }

  if (labelError) {
    return yield flashError(labelError);
  }

  yield put(clearAddressLabel(address));
  yield put(
    setAddressLabel({
      address,
      label
    })
  );

  if (id === ADDRESS_BOOK_TABLE_ID) {
    // When entering a new label, create a new entry.
    yield put(
      setAddressLabelEntry({
        id: nextId,
        address,
        temporaryAddress: address,
        addressError: undefined,
        label,
        temporaryLabel: label,
        labelError: undefined
      })
    );
    yield put(
      setAddressLabelEntry({
        id: ADDRESS_BOOK_TABLE_ID,
        address: '',
        temporaryAddress: '',
        addressError: undefined,
        label: '',
        temporaryLabel: '',
        labelError: undefined
      })
    );
  } else if (id === ACCOUNT_ADDRESS_ID) {
    const ownEntry = yield select(getAddressLabelEntryFromAddress, address);

    yield put(
      setAddressLabelEntry({
        id: ownEntry ? ownEntry.id : nextId,
        address,
        temporaryAddress: address,
        addressError: undefined,
        label,
        temporaryLabel: label,
        labelError: undefined
      })
    );
    yield put(
      setAddressLabelEntry({
        id: ACCOUNT_ADDRESS_ID,
        address: '',
        temporaryAddress: '',
        addressError: undefined,
        label: '',
        temporaryLabel: '',
        labelError: undefined
      })
    );
  } else {
    // When editing a label, overwrite the previous entry.
    yield put(
      setAddressLabelEntry({
        id,
        address,
        temporaryAddress: address,
        addressError: undefined,
        label,
        temporaryLabel: label,
        labelError: undefined
      })
    );
  }
}

export function* handleRemoveAddressLabelEntry(action: RemoveAddressLabelEntry): SagaIterator {
  const id = action.payload;
  const { id: entryId, address } = yield select(getAddressLabelEntry, id);

  if (typeof entryId === 'undefined') {
    return;
  }

  yield put(clearAddressLabel(address));
  yield put(clearAddressLabelEntry(id));

  if (id === ACCOUNT_ADDRESS_ID) {
    const ownEntry = yield select(getAddressLabelEntryFromAddress, address);

    if (ownEntry) {
      yield put(clearAddressLabelEntry(ownEntry.id));
    }
  }
}

export default function* addressBookSaga(): SagaIterator {
  yield takeEvery(TypeKeys.CHANGE_ADDRESS_LABEL_ENTRY, handleChangeAddressLabelEntry);
  yield takeEvery(TypeKeys.SAVE_ADDRESS_LABEL_ENTRY, handleSaveAddressLabelEntry);
  yield takeEvery(TypeKeys.REMOVE_ADDRESS_LABEL_ENTRY, handleRemoveAddressLabelEntry);
}