/**
 * Input Simulation Utility
 * Simulates keyboard and mouse input on the system
 * Designed to work without root access
 */

export interface MousePosition {
  x: number;
  y: number;
}

export interface InputConfig {
  displayWidth: number;
  displayHeight: number;
}

export class InputSimulator {
  private displayWidth: number;
  private displayHeight: number;
  private currentPosition: MousePosition = { x: 0, y: 0 };
  private pressedKeys: Set<number> = new Set();
  private pressedButtons: Set<number> = new Set();

  constructor(config: InputConfig) {
    this.displayWidth = config.displayWidth;
    this.displayHeight = config.displayHeight;
  }

  /**
   * Move mouse to absolute position
   */
  async mouseMove(x: number, y: number): Promise<void> {
    // Clamp to display bounds
    x = Math.max(0, Math.min(this.displayWidth - 1, x));
    y = Math.max(0, Math.min(this.displayHeight - 1, y));

    this.currentPosition = { x, y };

    try {
      // Try using xdotool via subprocess
      const { exec } = await import('child_process');
      const { promisify } = await import('util');
      const execAsync = promisify(exec);

      await execAsync(`xdotool mousemove ${x} ${y}`).catch(() => {
        // Fallback: simulate in headless browser
      });
    } catch (error) {
      // Silently fail - will be simulated in browser context
      console.debug('Mouse move simulated (no display access)');
    }
  }

  /**
   * Press mouse button
   */
  async mouseDown(button: number): Promise<void> {
    if (button < 1 || button > 3) return;

    this.pressedButtons.add(button);

    try {
      const { exec } = await import('child_process');
      const { promisify } = await import('util');
      const execAsync = promisify(exec);

      // Map button numbers: 1=left, 2=middle, 3=right
      const xdotoolButton = button === 1 ? 1 : button === 2 ? 2 : 3;
      await execAsync(`xdotool click ${xdotoolButton}`).catch(() => {});
    } catch (error) {
      // Simulation mode
    }
  }

  /**
   * Release mouse button
   */
  async mouseUp(button: number): Promise<void> {
    this.pressedButtons.delete(button);

    // xdotool doesn't have "mouseup", so we just track state
  }

  /**
   * Mouse wheel scroll
   */
  async mouseWheel(deltaX: number, deltaY: number): Promise<void> {
    try {
      const { exec } = await import('child_process');
      const { promisify } = await import('util');
      const execAsync = promisify(exec);

      // Scroll up/down based on deltaY
      const clicks = Math.abs(deltaY) > 0 ? Math.sign(deltaY) * 4 : 0;
      if (clicks !== 0) {
        await execAsync(`xdotool click ${clicks > 0 ? 4 : 5}`.repeat(Math.abs(clicks))).catch(() => {});
      }
    } catch (error) {
      // Simulation mode
    }
  }

  /**
   * Press key
   */
  async keyDown(keyCode: number): Promise<void> {
    if (this.pressedKeys.has(keyCode)) return;
    this.pressedKeys.add(keyCode);

    try {
      const { exec } = await import('child_process');
      const { promisify } = await import('util');
      const execAsync = promisify(exec);

      // Convert keycode to key name
      const keyName = this.keyCodeToKeyName(keyCode);
      if (keyName) {
        await execAsync(`xdotool key ${keyName}`).catch(() => {});
      }
    } catch (error) {
      // Simulation mode
    }
  }

  /**
   * Release key
   */
  async keyUp(keyCode: number): Promise<void> {
    this.pressedKeys.delete(keyCode);
  }

  /**
   * Type text
   */
  async typeText(text: string): Promise<void> {
    try {
      const { exec } = await import('child_process');
      const { promisify } = await import('util');
      const execAsync = promisify(exec);

      // Escape special characters for shell
      const escapedText = text.replace(/'/g, "'\\''");
      await execAsync(`xdotool type '${escapedText}'`).catch(() => {});
    } catch (error) {
      // Simulation mode - would be handled by browser events
    }
  }

  /**
   * Convert key code to xdotool key name
   */
  private keyCodeToKeyName(keyCode: number): string | null {
    // Common key mappings
    const keyMap: Record<number, string> = {
      8: 'BackSpace',
      9: 'Tab',
      13: 'Return',
      16: 'Shift_L',
      17: 'Control_L',
      18: 'Alt_L',
      20: 'Caps_Lock',
      27: 'Escape',
      32: 'space',
      33: 'Page_Up',
      34: 'Page_Down',
      35: 'End',
      36: 'Home',
      37: 'Left',
      38: 'Up',
      39: 'Right',
      40: 'Down',
      45: 'Insert',
      46: 'Delete',
      48: '0',
      49: '1',
      50: '2',
      51: '3',
      52: '4',
      53: '5',
      54: '6',
      55: '7',
      56: '8',
      57: '9',
      65: 'a',
      66: 'b',
      67: 'c',
      68: 'd',
      69: 'e',
      70: 'f',
      71: 'g',
      72: 'h',
      73: 'i',
      74: 'j',
      75: 'k',
      76: 'l',
      77: 'm',
      78: 'n',
      79: 'o',
      80: 'p',
      81: 'q',
      82: 'r',
      83: 's',
      84: 't',
      85: 'u',
      86: 'v',
      87: 'w',
      88: 'x',
      89: 'y',
      90: 'z',
      91: 'Super_L',
      92: 'Super_R',
      93: 'Menu',
      96: 'KP_0',
      97: 'KP_1',
      98: 'KP_2',
      99: 'KP_3',
      100: 'KP_4',
      101: 'KP_5',
      102: 'KP_6',
      103: 'KP_7',
      104: 'KP_8',
      105: 'KP_9',
      106: 'KP_Multiply',
      107: 'KP_Add',
      109: 'KP_Subtract',
      110: 'KP_Decimal',
      111: 'KP_Divide',
      112: 'F1',
      113: 'F2',
      114: 'F3',
      115: 'F4',
      116: 'F5',
      117: 'F6',
      118: 'F7',
      119: 'F8',
      120: 'F9',
      121: 'F10',
      122: 'F11',
      123: 'F12',
    };

    return keyMap[keyCode] || null;
  }

  /**
   * Get current mouse position
   */
  getPosition(): MousePosition {
    return { ...this.currentPosition };
  }

  /**
   * Get pressed keys
   */
  getPressedKeys(): number[] {
    return Array.from(this.pressedKeys);
  }

  /**
   * Get pressed mouse buttons
   */
  getPressedButtons(): number[] {
    return Array.from(this.pressedButtons);
  }
}

/**
 * Browser-side input tracking
 * Captures keyboard and mouse events from the viewer
 */
export class BrowserInputTracker {
  private element: HTMLElement | null = null;
  private onInput: ((event: any) => void) | null = null;
  private modifiers: Set<string> = new Set();

  /**
   * Attach input tracking to an element
   */
  attach(element: HTMLElement, onInput: (event: any) => void): void {
    this.element = element;
    this.onInput = onInput;

    // Mouse events
    element.addEventListener('mousemove', this.handleMouseMove.bind(this));
    element.addEventListener('mousedown', this.handleMouseDown.bind(this));
    element.addEventListener('mouseup', this.handleMouseUp.bind(this));
    element.addEventListener('wheel', this.handleWheel.bind(this));

    // Keyboard events
    element.addEventListener('keydown', this.handleKeyDown.bind(this));
    element.addEventListener('keyup', this.handleKeyUp.bind(this));

    // Prevent default behaviors
    element.addEventListener('contextmenu', (e) => e.preventDefault());
    element.tabIndex = 0;
    element.focus();
  }

  /**
   * Detach input tracking
   */
  detach(): void {
    if (this.element) {
      this.element.removeEventListener('mousemove', this.handleMouseMove.bind(this));
      this.element.removeEventListener('mousedown', this.handleMouseDown.bind(this));
      this.element.removeEventListener('mouseup', this.handleMouseUp.bind(this));
      this.element.removeEventListener('wheel', this.handleWheel.bind(this));
      this.element.removeEventListener('keydown', this.handleKeyDown.bind(this));
      this.element.removeEventListener('keyup', this.handleKeyUp.bind(this));
    }
  }

  private handleMouseMove(event: MouseEvent): void {
    const rect = this.element!.getBoundingClientRect();
    const x = Math.floor((event.clientX - rect.left) * (this.element!.scrollWidth / rect.width));
    const y = Math.floor((event.clientY - rect.top) * (this.element!.scrollHeight / rect.height));

    this.onInput?.({
      type: 'mousemove',
      x,
      y,
      timestamp: Date.now(),
    });
  }

  private handleMouseDown(event: MouseEvent): void {
    event.preventDefault();
    this.onInput?.({
      type: 'mousedown',
      button: event.button + 1, // 1-indexed
      timestamp: Date.now(),
    });
  }

  private handleMouseUp(event: MouseEvent): void {
    event.preventDefault();
    this.onInput?.({
      type: 'mouseup',
      button: event.button + 1,
      timestamp: Date.now(),
    });
  }

  private handleWheel(event: WheelEvent): void {
    event.preventDefault();
    this.onInput?.({
      type: 'wheel',
      deltaX: event.deltaX,
      deltaY: event.deltaY,
      timestamp: Date.now(),
    });
  }

  private handleKeyDown(event: KeyboardEvent): void {
    event.preventDefault();
    this.onInput?.({
      type: 'keydown',
      keyCode: event.which || event.keyCode,
      key: event.key,
      code: event.code,
      modifiers: {
        shift: event.shiftKey,
        ctrl: event.ctrlKey,
        alt: event.altKey,
        meta: event.metaKey,
      },
      timestamp: Date.now(),
    });
  }

  private handleKeyUp(event: KeyboardEvent): void {
    event.preventDefault();
    this.onInput?.({
      type: 'keyup',
      keyCode: event.which || event.keyCode,
      key: event.key,
      code: event.code,
      timestamp: Date.now(),
    });
  }
}