/**
 * @license
 * Copyright 2021 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

// Former goog.module ID: Blockly.dialog

import type {ToastOptions} from './toast.js';
import {Toast} from './toast.js';
import type {WorkspaceSvg} from './workspace_svg.js';

const defaultAlert = function (message: string, opt_callback?: () => void) {
  window.alert(message);
  if (opt_callback) {
    opt_callback();
  }
};

let alertImplementation = defaultAlert;

const defaultConfirm = function (
  message: string,
  callback: (result: boolean) => void,
) {
  callback(window.confirm(message));
};

let confirmImplementation = defaultConfirm;

const defaultPrompt = function (
  message: string,
  defaultValue: string,
  callback: (result: string | null) => void,
) {
  // NOTE TO DEVELOPER: Ephemeral focus doesn't need to be taken for the native
  // window prompt since it prevents focus from changing while open.
  callback(window.prompt(message, defaultValue));
};

let promptImplementation = defaultPrompt;

const defaultToast = Toast.show.bind(Toast);
let toastImplementation = defaultToast;

/**
 * Wrapper to window.alert() that app developers may override via setAlert to
 * provide alternatives to the modal browser window.
 *
 * @param message The message to display to the user.
 * @param opt_callback The callback when the alert is dismissed.
 */
export function alert(message: string, opt_callback?: () => void) {
  alertImplementation(message, opt_callback);
}

/**
 * Sets the function to be run when Blockly.dialog.alert() is called.
 *
 * @param alertFunction The function to be run, or undefined to restore the
 *     default implementation.
 * @see Blockly.dialog.alert
 */
export function setAlert(
  alertFunction: (
    message: string,
    callback?: () => void,
  ) => void = defaultAlert,
) {
  alertImplementation = alertFunction;
}

/**
 * Wrapper to window.confirm() that app developers may override via setConfirm
 * to provide alternatives to the modal browser window.
 *
 * @param message The message to display to the user.
 * @param callback The callback for handling user response.
 */
export function confirm(message: string, callback: (result: boolean) => void) {
  confirmImplementation(message, callback);
}

/**
 * Sets the function to be run when Blockly.dialog.confirm() is called.
 *
 * @param confirmFunction The function to be run, or undefined to restore the
 *     default implementation.
 * @see Blockly.dialog.confirm
 */
export function setConfirm(
  confirmFunction: (
    message: string,
    callback: (result: boolean) => void,
  ) => void = defaultConfirm,
) {
  confirmImplementation = confirmFunction;
}

/**
 * Wrapper to window.prompt() that app developers may override via setPrompt to
 * provide alternatives to the modal browser window. Built-in browser prompts
 * are often used for better text input experience on mobile device. We strongly
 * recommend testing mobile when overriding this.
 *
 * @param message The message to display to the user.
 * @param defaultValue The value to initialize the prompt with.
 * @param callback The callback for handling user response.
 */
export function prompt(
  message: string,
  defaultValue: string,
  callback: (result: string | null) => void,
) {
  promptImplementation(message, defaultValue, callback);
}

/**
 * Sets the function to be run when Blockly.dialog.prompt() is called.
 *
 * **Important**: When overridding this, be aware that non-native prompt
 * experiences may require managing ephemeral focus in FocusManager. This isn't
 * needed for the native window prompt because it prevents focus from being
 * changed while open.
 *
 * @param promptFunction The function to be run, or undefined to restore the
 *     default implementation.
 * @see Blockly.dialog.prompt
 */
export function setPrompt(
  promptFunction: (
    message: string,
    defaultValue: string,
    callback: (result: string | null) => void,
  ) => void = defaultPrompt,
) {
  promptImplementation = promptFunction;
}

/**
 * Displays a temporary notification atop the workspace. Blockly provides a
 * default toast implementation, but developers may provide their own via
 * setToast. For simple appearance customization, CSS should be sufficient.
 *
 * @param workspace The workspace to display the toast notification atop.
 * @param options Configuration options for the notification, including its
 *     message and duration.
 */
export function toast(workspace: WorkspaceSvg, options: ToastOptions) {
  toastImplementation(workspace, options);
}

/**
 * Sets the function to be run when Blockly.dialog.toast() is called.
 *
 * @param toastFunction The function to be run, or undefined to restore the
 *     default implementation.
 * @see Blockly.dialog.toast
 */
export function setToast(
  toastFunction: (
    workspace: WorkspaceSvg,
    options: ToastOptions,
  ) => void = defaultToast,
) {
  toastImplementation = toastFunction;
}