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

var scene  = {};
var player = require('player.js');

var assets = AssetBatch([
  { path: 'test.png', type: Asset.TYPE_TEXTURE, format: Texture.FORMAT_RGBA }
]);

// Pokemon DS-style camera: ~34 degrees elevation (atan(6/9)).
// CAM_HEIGHT / CAM_DIST ratio controls the tilt — keep it under 0.7 for
// the characteristically shallow DS angle.
const CAM_HEIGHT = 6;
const CAM_DIST   = 9;

var cam, camPos;
var floorEntity;

function updateCamera() {
  var pp = player.getPosition().worldPosition;
  // Position is offset above and behind the player; lookAt the exact player
  // world position so the player projects to the center pixel every frame.
  camPos.localPosition = new Vec3(pp.x, pp.y + CAM_HEIGHT, pp.z + CAM_DIST);
  camPos.lookAt(new Vec3(pp.x, pp.y, pp.z));
}

scene.init = async function() {
  assets.lock();
  await assets.loaded();

  var texEntry = assets.entry(0);

  // Camera
  cam    = Entity.create();
  camPos = cam.add(Component.POSITION);
  cam.add(Component.CAMERA);

  // Floor — infinite static plane at Y=0. Rendered as a large flat blue
  // slab using the default SHADER_MATERIAL (no texture needed).
  floorEntity = Entity.create();
  var floorPos     = floorEntity.add(Component.POSITION);
  var floorPhysics = floorEntity.add(Component.PHYSICS);
  floorPhysics.bodyType = Physics.STATIC;
  floorPhysics.shape    = Physics.SHAPE_PLANE;

  var floorR = floorEntity.add(Component.RENDERABLE);
  floorR.color = Color.BLUE;
  floorPos.localScale    = new Vec3(16, 0.2, 16);
  floorPos.localPosition = new Vec3(0, -0.1, 0);

  // Player — spawns 1 unit above the floor so physics drops it cleanly.
  player.create(texEntry);

  // Initialise camera at the correct angle from the player's spawn position.
  updateCamera();
};

scene.update = function() {
  player.update();
  updateCamera();
};

scene.dispose = function() {
  player.dispose();
  Entity.dispose(floorEntity);
  Entity.dispose(cam);
  assets.unlock();
};

module.exports = scene;