/**
 * Copyright 2017 Google Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the 'License');
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an 'AS IS' BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

const {helper} = require('./helper');

class Keyboard {
  /**
   * @param {!Puppeteer.Session} client
   */
  constructor(client) {
    this._client = client;
    this._modifiers = 0;
    this._pressedKeys = new Set();
  }

  /**
   * @param {string} key
   * @param {{text: string}=} options
   */
  async down(key, options = {text: undefined}) {
    let { text } = options;
    // If the key is a single character, and no modifiers are pressed except shift, a keypress should be generated by default.
    if (text === undefined)
      text = (key.length === 1 && !(this._modifiers & ~8)) ? key : '';
    const autoRepeat = this._pressedKeys.has(key);
    this._pressedKeys.add(key);
    this._modifiers |= this._modifierBit(key);
    await this._client.send('Input.dispatchKeyEvent', {
      type: text ? 'keyDown' : 'rawKeyDown',
      modifiers: this._modifiers,
      windowsVirtualKeyCode: keyCodeForKey(key),
      code: codeForKey(key),
      key,
      text,
      unmodifiedText: text,
      autoRepeat
    });
  }

  /**
   * @param {string} key
   * @return {number}
   */
  _modifierBit(key) {
    if (key === 'Alt')
      return 1;
    if (key === 'Control')
      return 2;
    if (key === 'Meta')
      return 4;
    if (key === 'Shift')
      return 8;
    return 0;
  }

  /**
   * @param {string} key
   */
  async up(key) {
    this._modifiers &= ~this._modifierBit(key);
    this._pressedKeys.delete(key);
    await this._client.send('Input.dispatchKeyEvent', {
      type: 'keyUp',
      modifiers: this._modifiers,
      key,
      windowsVirtualKeyCode: keyCodeForKey(key),
      code: codeForKey(key)
    });
  }

  /**
   * @param {string} char
   */
  async sendCharacter(char) {
    await this._client.send('Input.dispatchKeyEvent', {
      type: 'char',
      modifiers: this._modifiers,
      text: char,
      key: char,
      unmodifiedText: char
    });
  }

  /**
   * @param {string} text
   * @param {{delay: (number|undefined)}=} options
   */
  async type(text, options) {
    let delay = 0;
    if (options && options.delay)
      delay = options.delay;
    for (const char of text) {
      await this.press(char, {text: char, delay});
      if (delay)
        await new Promise(f => setTimeout(f, delay));
    }
  }

  /**
   * @param {string} key
   * @param {!Object=} options
   */
  async press(key, options) {
    await this.down(key, options);
    if (options && options.delay)
      await new Promise(f => setTimeout(f, options.delay));
    await this.up(key);
  }
}

class Mouse {
  /**
   * @param {Puppeteer.Session} client
   * @param {!Keyboard} keyboard
   */
  constructor(client, keyboard) {
    this._client = client;
    this._keyboard = keyboard;
    this._x = 0;
    this._y = 0;
    this._button = 'none';
  }

  /**
   * @param {number} x
   * @param {number} y
   * @param {Object=} options
   * @return {!Promise}
   */
  async move(x, y, options = {}) {
    const fromX = this._x, fromY = this._y;
    this._x = x;
    this._y = y;
    const steps = options.steps || 1;
    for (let i = 1; i <= steps; i++) {
      await this._client.send('Input.dispatchMouseEvent', {
        type: 'mouseMoved',
        button: this._button,
        x: fromX + (this._x - fromX) * (i / steps),
        y: fromY + (this._y - fromY) * (i / steps),
        modifiers: this._keyboard._modifiers
      });
    }
  }

  /**
   * @param {number} x
   * @param {number} y
   * @param {!Object=} options
   */
  async click(x, y, options = {}) {
    this.move(x, y);
    this.down(options);
    if (typeof options.delay === 'number')
      await new Promise(f => setTimeout(f, options.delay));
    await this.up(options);
  }

  /**
   * @param {!Object=} options
   */
  async down(options = {}) {
    this._button = (options.button || 'left');
    await this._client.send('Input.dispatchMouseEvent', {
      type: 'mousePressed',
      button: this._button,
      x: this._x,
      y: this._y,
      modifiers: this._keyboard._modifiers,
      clickCount: (options.clickCount || 1)
    });
  }

  /**
   * @param {!Object=} options
   */
  async up(options = {}) {
    this._button = 'none';
    await this._client.send('Input.dispatchMouseEvent', {
      type: 'mouseReleased',
      button: (options.button || 'left'),
      x: this._x,
      y: this._y,
      modifiers: this._keyboard._modifiers,
      clickCount: (options.clickCount || 1)
    });
  }
}

class Touchscreen {
  /**
   * @param {Puppeteer.Session} client
   * @param {Keyboard} keyboard
   */
  constructor(client, keyboard) {
    this._client = client;
    this._keyboard = keyboard;
  }

  /**
   * @param {number} x
   * @param {number} y
   */
  async tap(x, y) {
    const touchPoints = [{x: Math.round(x), y: Math.round(y)}];
    await this._client.send('Input.dispatchTouchEvent', {
      type: 'touchStart',
      touchPoints,
      modifiers: this._keyboard._modifiers
    });
    await this._client.send('Input.dispatchTouchEvent', {
      type: 'touchEnd',
      touchPoints: [],
      modifiers: this._keyboard._modifiers
    });
  }
}

/**
 * @type {Object<string, {keyCode: number, code: string}>}
 */
const keys = {
  'Cancel': {keyCode: 3, code: 'Abort'},
  'Help': {keyCode: 6, code: 'Help'},
  'Backspace': {keyCode: 8, code: 'Backspace'},
  'Tab': {keyCode: 9, code: 'Tab'},
  'Clear': {keyCode: 12, code: ''},
  'Enter': {keyCode: 13, code: 'Enter'},
  'Shift': {keyCode: 16, code: 'ShiftLeft'},
  'Control': {keyCode: 17, code: 'ControlLeft'},
  'Alt': {keyCode: 18, code: 'AltLeft'},
  'Pause': {keyCode: 19, code: 'Pause'},
  'CapsLock': {keyCode: 20, code: 'CapsLock'},
  'Escape': {keyCode: 27, code: 'Escape'},
  'Convert': {keyCode: 28, code: 'Convert'},
  'NonConvert': {keyCode: 29, code: 'NonConvert'},
  'Accept': {keyCode: 30, code: ''},
  'ModeChange': {keyCode: 31, code: ''},
  'PageUp': {keyCode: 33, code: 'PageUp'},
  'PageDown': {keyCode: 34, code: 'PageDown'},
  'End': {keyCode: 35, code: 'End'},
  'Home': {keyCode: 36, code: 'Home'},
  'ArrowLeft': {keyCode: 37, code: 'ArrowLeft'},
  'ArrowUp': {keyCode: 38, code: 'ArrowUp'},
  'ArrowRight': {keyCode: 39, code: 'ArrowRight'},
  'ArrowDown': {keyCode: 40, code: 'ArrowDown'},
  'Select': {keyCode: 41, code: 'Select'},
  'Print': {keyCode: 42, code: ''},
  'Execute': {keyCode: 43, code: 'Open'},
  'PrintScreen': {keyCode: 44, code: 'PrintScreen'},
  'Insert': {keyCode: 45, code: 'Insert'},
  'Delete': {keyCode: 46, code: 'Delete'},
  ')': {keyCode: 48, code: 'Digit0'},
  '!': {keyCode: 49, code: 'Digit1'},
  '@': {keyCode: 50, code: 'Digit2'},
  '#': {keyCode: 51, code: 'Digit3'},
  '$': {keyCode: 52, code: 'Digit4'},
  '%': {keyCode: 53, code: 'Digit5'},
  '^': {keyCode: 54, code: 'Digit6'},
  '&': {keyCode: 55, code: 'Digit7'},
  '*': {keyCode: 56, code: 'Digit8'},
  '(': {keyCode: 57, code: 'Digit9'},
  'Meta': {keyCode: 91, code: 'MetaLeft'},
  'ContextMenu': {keyCode: 93, code: 'ContextMenu'},
  'F1': {keyCode: 112, code: 'F1'},
  'F2': {keyCode: 113, code: 'F2'},
  'F3': {keyCode: 114, code: 'F3'},
  'F4': {keyCode: 115, code: 'F4'},
  'F5': {keyCode: 116, code: 'F5'},
  'F6': {keyCode: 117, code: 'F6'},
  'F7': {keyCode: 118, code: 'F7'},
  'F8': {keyCode: 119, code: 'F8'},
  'F9': {keyCode: 120, code: 'F9'},
  'F10': {keyCode: 121, code: 'F10'},
  'F11': {keyCode: 122, code: 'F11'},
  'F12': {keyCode: 123, code: 'F12'},
  'F13': {keyCode: 124, code: 'F13'},
  'F14': {keyCode: 125, code: 'F14'},
  'F15': {keyCode: 126, code: 'F15'},
  'F16': {keyCode: 127, code: 'F16'},
  'F17': {keyCode: 128, code: 'F17'},
  'F18': {keyCode: 129, code: 'F18'},
  'F19': {keyCode: 130, code: 'F19'},
  'F20': {keyCode: 131, code: 'F20'},
  'F21': {keyCode: 132, code: 'F21'},
  'F22': {keyCode: 133, code: 'F22'},
  'F23': {keyCode: 134, code: 'F23'},
  'F24': {keyCode: 135, code: 'F24'},
  'NumLock': {keyCode: 144, code: 'NumLock'},
  'ScrollLock': {keyCode: 145, code: 'ScrollLock'},
  'AudioVolumeMute': {keyCode: 173, code: 'AudioVolumeMute'},
  'AudioVolumeDown': {keyCode: 174, code: 'AudioVolumeDown'},
  'AudioVolumeUp': {keyCode: 175, code: 'AudioVolumeUp'},
  'MediaTrackNext': {keyCode: 176, code: 'MediaTrackNext'},
  'MediaTrackPrevious': {keyCode: 177, code: 'MediaTrackPrevious'},
  'MediaStop': {keyCode: 178, code: 'MediaStop'},
  'MediaPlayPause': {keyCode: 179, code: 'MediaPlayPause'},
  ';': {keyCode: 186, code: 'Semicolon'},
  ':': {keyCode: 186, code: 'Semicolon'},
  '=': {keyCode: 187, code: 'Equal'},
  '+': {keyCode: 187, code: 'Equal'},
  ',': {keyCode: 188, code: 'Comma'},
  '<': {keyCode: 188, code: 'Comma'},
  '-': {keyCode: 189, code: 'Minus'},
  '_': {keyCode: 189, code: 'Minus'},
  '.': {keyCode: 190, code: 'Period'},
  '>': {keyCode: 190, code: 'Period'},
  '/': {keyCode: 191, code: 'Slash'},
  '?': {keyCode: 191, code: 'Slash'},
  '`': {keyCode: 192, code: 'Backquote'},
  '~': {keyCode: 192, code: 'Backquote'},
  '[': {keyCode: 219, code: 'BracketLeft'},
  '{': {keyCode: 219, code: 'BracketLeft'},
  '\\': {keyCode: 220, code: 'Backslash'},
  '|': {keyCode: 220, code: 'Backslash'},
  ']': {keyCode: 221, code: 'BracketRight'},
  '}': {keyCode: 221, code: 'BracketRight'},
  '\'': {keyCode: 222, code: 'Quote'},
  '"': {keyCode: 222, code: 'Quote'},
  'AltGraph': {keyCode: 225, code: 'AltGraph'},
  'Attn': {keyCode: 246, code: ''},
  'CrSel': {keyCode: 247, code: 'Props'},
  'ExSel': {keyCode: 248, code: ''},
  'EraseEof': {keyCode: 249, code: ''},
  'Play': {keyCode: 250, code: ''},
  'ZoomOut': {keyCode: 251, code: ''},
  '0': { keyCode: 48, code: 'Digit0'},
  '1': { keyCode: 49, code: 'Digit1'},
  '2': { keyCode: 50, code: 'Digit2'},
  '3': { keyCode: 51, code: 'Digit3'},
  '4': { keyCode: 52, code: 'Digit4'},
  '5': { keyCode: 53, code: 'Digit5'},
  '6': { keyCode: 54, code: 'Digit6'},
  '7': { keyCode: 55, code: 'Digit7'},
  '8': { keyCode: 56, code: 'Digit8'},
  '9': { keyCode: 57, code: 'Digit9'},
  'q': { keyCode: 81, code: 'KeyQ'},
  'w': { keyCode: 87, code: 'KeyW'},
  'e': { keyCode: 69, code: 'KeyE'},
  'r': { keyCode: 82, code: 'KeyR'},
  't': { keyCode: 84, code: 'KeyT'},
  'y': { keyCode: 89, code: 'KeyY'},
  'u': { keyCode: 85, code: 'KeyU'},
  'i': { keyCode: 73, code: 'KeyI'},
  'o': { keyCode: 79, code: 'KeyO'},
  'p': { keyCode: 80, code: 'KeyP'},
  'a': { keyCode: 65, code: 'KeyA'},
  's': { keyCode: 83, code: 'KeyS'},
  'd': { keyCode: 68, code: 'KeyD'},
  'f': { keyCode: 70, code: 'KeyF'},
  'g': { keyCode: 71, code: 'KeyG'},
  'h': { keyCode: 72, code: 'KeyH'},
  'j': { keyCode: 74, code: 'KeyJ'},
  'k': { keyCode: 75, code: 'KeyK'},
  'l': { keyCode: 76, code: 'KeyL'},
  'z': { keyCode: 90, code: 'KeyZ'},
  'x': { keyCode: 88, code: 'KeyX'},
  'c': { keyCode: 67, code: 'KeyC'},
  'v': { keyCode: 86, code: 'KeyV'},
  'b': { keyCode: 66, code: 'KeyB'},
  'n': { keyCode: 78, code: 'KeyN'},
  'm': { keyCode: 77, code: 'KeyM'},
  'Q': { keyCode: 81, code: 'KeyQ'},
  'W': { keyCode: 87, code: 'KeyW'},
  'E': { keyCode: 69, code: 'KeyE'},
  'R': { keyCode: 82, code: 'KeyR'},
  'T': { keyCode: 84, code: 'KeyT'},
  'Y': { keyCode: 89, code: 'KeyY'},
  'U': { keyCode: 85, code: 'KeyU'},
  'I': { keyCode: 73, code: 'KeyI'},
  'O': { keyCode: 79, code: 'KeyO'},
  'P': { keyCode: 80, code: 'KeyP'},
  'A': { keyCode: 65, code: 'KeyA'},
  'S': { keyCode: 83, code: 'KeyS'},
  'D': { keyCode: 68, code: 'KeyD'},
  'F': { keyCode: 70, code: 'KeyF'},
  'G': { keyCode: 71, code: 'KeyG'},
  'H': { keyCode: 72, code: 'KeyH'},
  'J': { keyCode: 74, code: 'KeyJ'},
  'K': { keyCode: 75, code: 'KeyK'},
  'L': { keyCode: 76, code: 'KeyL'},
  'Z': { keyCode: 90, code: 'KeyZ'},
  'X': { keyCode: 88, code: 'KeyX'},
  'C': { keyCode: 67, code: 'KeyC'},
  'V': { keyCode: 86, code: 'KeyV'},
  'B': { keyCode: 66, code: 'KeyB'},
  'N': { keyCode: 78, code: 'KeyN'},
  'M': { keyCode: 77, code: 'KeyM'}
};

/**
 * @param {string} key
 * @return {number}
 */
function keyCodeForKey(key) {
  if (keys[key])
    return keys[key].keyCode;
  if (key.length === 1)
    return key.toUpperCase().charCodeAt(0);
  return 0;
}

/**
 * @param {string} key
 * @return {string}
 */
function codeForKey(key) {
  if (!keys[key])
    return '';
  return keys[key].code;
}

module.exports = { Keyboard, Mouse, Touchscreen};
helper.tracePublicAPI(Keyboard);
helper.tracePublicAPI(Mouse);
helper.tracePublicAPI(Touchscreen);