/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule AlertIOS
 * @flow
 * @jsdoc
 */
'use strict';

var RCTAlertManager = require('NativeModules').AlertManager;

/**
 * An Alert button type
 */
export type AlertType = $Enum<{
  /**
   * Default alert with no inputs
   */
  'default': string,
  /**
   * Plain text input alert
   */
  'plain-text': string,
  /**
   * Secure text input alert
   */
  'secure-text': string,
  /**
   * Login and password alert
   */
  'login-password': string,
}>;

/**
 * An Alert button style
 */
export type AlertButtonStyle = $Enum<{
  /**
   * Default button style
   */
  'default': string,
  /**
   * Cancel button style
   */
  'cancel': string,
  /**
   * Destructive button style
   */
  'destructive': string,
}>;

/**
 * Array or buttons
 * @typedef {Array} ButtonsArray
 * @property {string=} text Button label
 * @property {Function=} onPress Callback function when button pressed
 * @property {AlertButtonStyle=} style Button style
 */
export type ButtonsArray = Array<{
  /**
   * Button label
   */
  text?: string,
  /**
   * Callback function when button pressed
   */
  onPress?: ?Function,
  /**
   * Button style
   */
  style?: AlertButtonStyle,
}>;

/**
 * Use `AlertIOS` to display an alert dialog with a message or to create a prompt for user input on iOS. If you don't need to prompt for user input, we recommend using `Alert.alert() for cross-platform support.
 *
 * See http://facebook.github.io/react-native/docs/alertios.html
 */
class AlertIOS {
  /**
   * Create and display a popup alert.
   *
   * See http://facebook.github.io/react-native/docs/alertios.html#alert
   */
  static alert(
    title: ?string,
    message?: ?string,
    callbackOrButtons?: ?(() => void) | ButtonsArray,
    type?: AlertType,
  ): void {
    if (typeof type !== 'undefined') {
      console.warn('AlertIOS.alert() with a 4th "type" parameter is deprecated and will be removed. Use AlertIOS.prompt() instead.');
      this.prompt(title, message, callbackOrButtons, type);
      return;
    }
    this.prompt(title, message, callbackOrButtons, 'default');
  }

  /**
   * Create and display a prompt to enter some text.
   * 
   * See http://facebook.github.io/react-native/docs/alertios.html#prompt
   */
  static prompt(
    title: ?string,
    message?: ?string,
    callbackOrButtons?: ?((text: string) => void) | ButtonsArray,
    type?: ?AlertType = 'plain-text',
    defaultValue?: string,
    keyboardType?: string
  ): void {
    if (typeof type === 'function') {
      console.warn(
        'You passed a callback function as the "type" argument to AlertIOS.prompt(). React Native is ' +
        'assuming  you want to use the deprecated AlertIOS.prompt(title, defaultValue, buttons, callback) ' +
        'signature. The current signature is AlertIOS.prompt(title, message, callbackOrButtons, type, defaultValue, ' +
        'keyboardType) and the old syntax will be removed in a future version.');

      var callback = type;
      var defaultValue = message;
      RCTAlertManager.alertWithArgs({
        title: title || '',
        type: 'plain-text',
        defaultValue,
      }, (id, value) => {
        callback(value);
      });
      return;
    }

    var callbacks = [];
    var buttons = [];
    var cancelButtonKey;
    var destructiveButtonKey;
    if (typeof callbackOrButtons === 'function') {
      callbacks = [callbackOrButtons];
    }
    else if (callbackOrButtons instanceof Array) {
      callbackOrButtons.forEach((btn, index) => {
        callbacks[index] = btn.onPress;
        if (btn.style === 'cancel') {
          cancelButtonKey = String(index);
        } else if (btn.style === 'destructive') {
          destructiveButtonKey = String(index);
        }
        if (btn.text || index < (callbackOrButtons || []).length - 1) {
          var btnDef = {};
          btnDef[index] = btn.text || '';
          buttons.push(btnDef);
        }
      });
    }

    RCTAlertManager.alertWithArgs({
      title: title || '',
      message: message || undefined,
      buttons,
      type: type || undefined,
      defaultValue,
      cancelButtonKey,
      destructiveButtonKey,
      keyboardType,
    }, (id, value) => {
      var cb = callbacks[id];
      cb && cb(value);
    });
  }
}

module.exports = AlertIOS;