// Copyright 2025 International Digital Economy Academy
//
// 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.

///|
pub impl @system.Backend for CanvasBackend with register_mouse_events(
  _self,
  mouse : @system.Mouse,
) {
  window.add_event_listener("mousemove", event => {
    let mouse_event = event.to_mouse_event().unwrap()
    mouse.pos = @math.Vec2D(
      mouse_event.get_offset_x().to_double(),
      mouse_event.get_offset_y().to_double(),
    )
  })
  window.add_event_listener("mousedown", event => {
    let mouse_event = event.to_mouse_event().unwrap()
    match mouse_event.get_button() {
      0 => mouse.left_button = true
      1 => mouse.middle_button = true
      2 => mouse.right_button = true
      _ => ()
    }
  })
  window.add_event_listener("mouseup", event => {
    let mouse_event = event.to_mouse_event().unwrap()
    match mouse_event.get_button() {
      0 => mouse.left_button = false
      1 => mouse.middle_button = false
      2 => mouse.right_button = false
      _ => ()
    }
  })
}