//
// Spine Runtimes License Agreement
// Last updated April 5, 2025. Replaces all prior versions.
//
// Copyright (c) 2013-2025, Esoteric Software LLC
//
// Integration of the Spine Runtimes into software or otherwise creating
// derivative works of the Spine Runtimes is permitted under the terms and
// conditions of Section 2 of the Spine Editor License Agreement:
// http://esotericsoftware.com/spine-editor-license
//
// Otherwise, it is permitted to integrate the Spine Runtimes into software
// or otherwise create derivative works of the Spine Runtimes (collectively,
// "Products"), provided that each user of the Products must obtain their own
// Spine Editor license and redistribution of the Products in any form must
// include this license and copyright notice.
//
// THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
// BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
// THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//

import 'package:spine_flutter/spine_flutter.dart';
import 'package:flutter/material.dart';

class PhysicsTest extends StatefulWidget {
  const PhysicsTest({super.key});

  @override
  PhysicsState createState() => PhysicsState();
}

class PhysicsState extends State<PhysicsTest> {
  late SpineWidgetController controller;
  Offset? mousePosition;
  Offset? lastMousePosition;

  @override
  void initState() {
    super.initState();

    controller = SpineWidgetController(
      onInitialized: (controller) {
        controller.animationState.setAnimation(0, "eyeblink-long", true);
        controller.animationState.setAnimation(1, "wings-and-feet", true);
      },
      onAfterUpdateWorldTransforms: (controller) {
        if (lastMousePosition == null) {
          lastMousePosition = mousePosition;
          return;
        }
        if (mousePosition == null) {
          return;
        }

        final dx = mousePosition!.dx - lastMousePosition!.dx;
        final dy = mousePosition!.dy - lastMousePosition!.dy;
        final position = controller.skeleton.getPosition();
        position.x += dx;
        position.y += dy;
        controller.skeleton.setPosition(position.x, position.y);
        lastMousePosition = mousePosition;
      },
    );
  }

  void _updateBonePosition(Offset position) {
    mousePosition = controller.toSkeletonCoordinates(position);
  }

  @override
  Widget build(BuildContext context) {
    reportLeaks();

    return Scaffold(
      appBar: AppBar(title: const Text('Physics (drag anywhere)')),
      body: GestureDetector(
        onPanDown: (drag) => _updateBonePosition(drag.localPosition),
        onPanUpdate: (drag) => _updateBonePosition(drag.localPosition),
        child: SpineWidget.fromAsset("assets/celestial-circus.atlas", "assets/celestial-circus-pro.skel", controller),
      ),
    );
  }
}