/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @format
 * @flow strict-local
 */

'use strict';

import type {Options, DatePickerOpenAction} from './DatePickerAndroidTypes';
import NativeDatePickerAndroid from './NativeDatePickerAndroid';

/**
 * Convert a Date to a timestamp.
 */
function _toMillis(options: Options, key: string) {
  const dateVal = options[key];
  // Is it a Date object?
  if (typeof dateVal === 'object' && typeof dateVal.getMonth === 'function') {
    options[key] = dateVal.getTime();
  }
}

/**
 * Opens the standard Android date picker dialog.
 *
 * ### Example
 *
 * ```
 * try {
 *   const {action, year, month, day} = await DatePickerAndroid.open({
 *     // Use `new Date()` for current date.
 *     // May 25 2020. Month 0 is January.
 *     date: new Date(2020, 4, 25)
 *   });
 *   if (action !== DatePickerAndroid.dismissedAction) {
 *     // Selected year, month (0-11), day
 *   }
 * } catch ({code, message}) {
 *   console.warn('Cannot open date picker', message);
 * }
 * ```
 */
class DatePickerAndroid {
  /**
   * Opens the standard Android date picker dialog.
   *
   * The available keys for the `options` object are:
   *
   *   - `date` (`Date` object or timestamp in milliseconds) - date to show by default
   *   - `minDate` (`Date` or timestamp in milliseconds) - minimum date that can be selected
   *   - `maxDate` (`Date` object or timestamp in milliseconds) - maximum date that can be selected
   *   - `mode` (`enum('calendar', 'spinner', 'default')`) - To set the date-picker mode to calendar/spinner/default
   *     - 'calendar': Show a date picker in calendar mode.
   *     - 'spinner': Show a date picker in spinner mode.
   *     - 'default': Show a default native date picker(spinner/calendar) based on android versions.
   *
   * Returns a Promise which will be invoked an object containing `action`, `year`, `month` (0-11),
   * `day` if the user picked a date. If the user dismissed the dialog, the Promise will
   * still be resolved with action being `DatePickerAndroid.dismissedAction` and all the other keys
   * being undefined. **Always** check whether the `action` before reading the values.
   *
   * Note the native date picker dialog has some UI glitches on Android 4 and lower
   * when using the `minDate` and `maxDate` options.
   */
  static async open(options: ?Options): Promise<DatePickerOpenAction> {
    const optionsMs = options;
    if (optionsMs != null) {
      _toMillis(optionsMs, 'date');
      _toMillis(optionsMs, 'minDate');
      _toMillis(optionsMs, 'maxDate');
    }
    return NativeDatePickerAndroid.open(options);
  }

  /**
   * A date has been selected.
   */
  static +dateSetAction: 'dateSetAction' = 'dateSetAction';
  /**
   * The dialog has been dismissed.
   */
  static +dismissedAction: 'dismissedAction' = 'dismissedAction';
}

module.exports = DatePickerAndroid;