// Copyright (c) 2026 Dominic Masters
//
// This software is released under the MIT License.
// https://opensource.org/licenses/MIT

var CAMERA_OFFSET_ANGLE = 0.0;
var CAMERA_OFFSET_RADIUS = 18.0;
var CAMERA_OFFSET_HEIGHT = 10.0;

class PlayerCamera {
  constructor(target) {
    this.target = target;

    this.entity = new Entity();
    this.position = this.entity.add(POSITION);
    this.entity.add(CAMERA);

    this.update();
  }

  update() {
    var targetPosition = this.target.position.getLocalPosition();

    var eyeX = targetPosition.x + Math.cos(CAMERA_OFFSET_ANGLE) *
      CAMERA_OFFSET_RADIUS;
    var eyeY = targetPosition.y + CAMERA_OFFSET_HEIGHT;
    var eyeZ = targetPosition.z + Math.sin(CAMERA_OFFSET_ANGLE) *
      CAMERA_OFFSET_RADIUS;

    this.position.lookAt(
      eyeX, eyeY, eyeZ,
      targetPosition.x, targetPosition.y, targetPosition.z,
      0.0, 1.0, 0.0
    );
  }
}

module.exports = PlayerCamera;