// Input-State: Tastatur, Maus-Look (Edge-Flags fuer Klicks).
export class Input {
  constructor(domElement) {
    this.el = domElement;
    this.keys = new Set();
    this.mouseDX = 0;
    this.mouseDY = 0;
    this.leftClick = false;   // Edge (diese Frame)
    this.rightClick = false;  // Edge (diese Frame)
    this.locked = false;

    window.addEventListener('keydown', (e) => {
      this.keys.add(e.code);
      if (e.code === 'Space') e.preventDefault();
    });
    window.addEventListener('keyup', (e) => this.keys.delete(e.code));

    document.addEventListener('pointerlockchange', () => {
      this.locked = document.pointerLockElement === this.el;
    });

    this.el.addEventListener('mousedown', (e) => {
      if (!this.locked) return;
      if (e.button === 0) this.leftClick = true;
      if (e.button === 2) this.rightClick = true;
    });
    this.el.addEventListener('contextmenu', (e) => e.preventDefault());

    document.addEventListener('mousemove', (e) => {
      if (!this.locked) return;
      this.mouseDX += e.movementX || 0;
      this.mouseDY += e.movementY || 0;
    });
  }

  requestLock() { this.el.requestPointerLock(); }

  // Am Ende jedes Frames aufrufen.
  endFrame() {
    this.mouseDX = 0;
    this.mouseDY = 0;
    this.leftClick = false;
    this.rightClick = false;
  }

  down(code) { return this.keys.has(code); }
}