# Copyright 2022 Frederico de Oliveira Linhares
#
# 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.

ROTATION_SPEED = Math::PI/45;
TRANSLATION_SPEED = 0.5;

def init()
  $texture = CandyGear::Texture.from_image("textures/color_texture.png");
  $model = CandyGear::Model.new("models/cube.cgmodel", $texture);

  $instances = [
    CandyGear::Model::Instance.new(
      $model,
      5.0, 0.0, 0.0,
      0.0, 0.0, 0.0),
    CandyGear::Model::Instance.new(
      $model,
      -5.0, 0.0, 0.0,
      0.0, 0.0, 0.0),
    CandyGear::Model::Instance.new(
      $model,
      0.0, 5.0, 0.0,
      0.0, 0.0, 0.0),
    CandyGear::Model::Instance.new(
      $model,
      0.0, -5.0, 0.0,
      0.0, 0.0, 0.0),
    CandyGear::Model::Instance.new(
      $model,
      0.0, 0.0, 5.0,
      0.0, 0.0, 0.0),
    CandyGear::Model::Instance.new(
      $model,
      0.0, 0.0, -5.0,
      0.0, 0.0, 0.0)
  ];

  $camera = CandyGear::Camera.new(0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
  $camera.use();
end

def key_down(key)
  case key
  when CandyGear::Key::I
    $camera.rotate(ROTATION_SPEED, 0.0, 0.0);
  when CandyGear::Key::K
    $camera.rotate(-ROTATION_SPEED, 0.0, 0.0);
  when CandyGear::Key::J
    $camera.rotate(0.0, ROTATION_SPEED, 0.0);
  when CandyGear::Key::L
    $camera.rotate(0.0, -ROTATION_SPEED, 0.0);
  when CandyGear::Key::E
    $camera.translate_by_rotation(0.0, 0.0, -TRANSLATION_SPEED);
  when CandyGear::Key::D
    $camera.translate_by_rotation(0.0, 0.0, TRANSLATION_SPEED);
  when CandyGear::Key::S
    $camera.translate_by_rotation(-TRANSLATION_SPEED, 0.0, 0.0);
  when CandyGear::Key::F
    $camera.translate_by_rotation(TRANSLATION_SPEED, 0.0, 0.0);
  end
end

def key_up(key)
end

def quit() = CandyGear.quit();

def tick()
  $instances.each {|i| i.draw();};
end