import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: WaveScreen()
    );
  }
}

class WaveScreen extends StatefulWidget {
  @override
  _WaveScreenState createState() => _WaveScreenState();
}

class _WaveScreenState extends State<WaveScreen> {
  var _slider = 0.0;
  var _depth = 10.0;
  var _red = 0.0;
  var _green = 0.0;
  var _blue = 0.0;

  var _orientation = 0;
  var _waveOrientation = Orientation.UP;

  @override
  Widget build(BuildContext context) {
    final size = MediaQuery.of(context).size;

    return Material(
      color: Colors.white,
      child: Stack(
        children: [
          Align(
            alignment: Alignment(0, 0),
            child: FittedBox(
              fit: BoxFit.none,
              child: Column(
                children: [
                  Text('Orientation'),
                  Container(
                    width: size.width,
                    child: Row(
                      mainAxisSize: MainAxisSize.max,
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: [
                        Radio(
                          value: 0,
                          groupValue: _orientation,
                          onChanged: _orientationChanged,
                        ),
                        Text('UP'),
                        Radio(
                          value: 1,
                          groupValue: _orientation,
                          onChanged: _orientationChanged,
                        ),
                        Text('UP REVERSE'),
                        Radio(
                          value: 2,
                          groupValue: _orientation,
                          onChanged: _orientationChanged,
                        ),
                        Text('DOWN'),
                        Radio(
                          value: 3,
                          groupValue: _orientation,
                          onChanged: _orientationChanged,
                        ),
                        Text('DOWN REVERSE'),
                      ],
                    ),
                  ),
                  SizedBox(height: 20),
                  Text('Color Selector'),
                  Container(
                    width: size.width,
                    child: Row(
                      mainAxisSize: MainAxisSize.max,
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: [
                        Slider(
                          value: _red,
                          onChanged: (value) => setState(() => _red = value),
                          min: 0,
                          max: 255,
                          divisions: 255,
                          activeColor: Colors.red,
                          inactiveColor: Colors.red,
                        ),
                        Slider(
                          value: _green,
                          onChanged: (value) => setState(() => _green = value),
                          min: 0,
                          max: 255,
                          divisions: 255,
                          activeColor: Colors.green,
                          inactiveColor: Colors.green,
                        ),
                        Slider(
                          value: _blue,
                          onChanged: (value) => setState(() => _blue = value),
                          min: 0,
                          max: 255,
                          divisions: 255,
                          activeColor: Colors.blue,
                          inactiveColor: Colors.blue,
                        )
                      ],
                    ),
                  ),
                  SizedBox(height: 20),
                  Text('Waves: ${_slider.toInt()}'),
                  Container(
                    width: size.width - 60,
                    child: Slider(
                      value: _slider,
                      onChanged: (value) => setState(() => _slider = value),
                      min: 0,
                      max: 80,
                      divisions: 80,
                      activeColor: Color.fromARGB(255, _red.toInt(), _green.toInt(), _blue.toInt()),
                      inactiveColor: Color.fromARGB(255, _red.toInt(), _green.toInt(), _blue.toInt()),
                    ),
                  ),
                  Text('Depth: ${_depth.toInt()}'),
                  Container(
                    width: size.width - 60,
                    child: Slider(
                      value: _depth,
                      onChanged: (value) => setState(() => _depth = value),
                      min: 0,
                      max: 80,
                      activeColor: Color.fromARGB(255, _red.toInt(), _green.toInt(), _blue.toInt()),
                      inactiveColor: Color.fromARGB(255, _red.toInt(), _green.toInt(), _blue.toInt()),
                    ),
                  ),
                  SizedBox(height: 10),
                  ClipPath(
                    clipper: _slider.toInt() == 0
                        ? null
                        : WaveGeneratorPath(
                            amount: _slider.toInt(), depth: _depth.toInt(), orientation: _waveOrientation),
                    child: Container(
                      padding: const EdgeInsets.only(bottom: 50),
                      width: size.width,
                      height: 200,
                      color: Color.fromARGB(255, _red.toInt(), _green.toInt(), _blue.toInt()),
                    ),
                  ),
                ],
              ),
            ),
          )
        ],
      ),
    );
  }

  _orientationChanged(int index) {
    setState(() => _orientation = index);
    switch (index) {
      case 0:
        setState(() => _waveOrientation = Orientation.UP);
        break;
      case 1:
        setState(() => _waveOrientation = Orientation.UP_REVERSE);
        break;
      case 2:
        setState(() => _waveOrientation = Orientation.DOWN);
        break;
      case 3:
        setState(() => _waveOrientation = Orientation.DOWN_REVERSE);
        break;
    }
  }
}

enum Orientation { UP, UP_REVERSE, DOWN, DOWN_REVERSE }

class WaveGeneratorPath extends CustomClipper<Path> {
  final amount;
  final depth;
  final orientation;

  WaveGeneratorPath({this.amount, this.depth, this.orientation});

  @override
  Path getClip(Size size) {
    var path = new Path();
    var sections = size.width / amount;
    for (int index = 0; index < amount; index++) {
      path.lineTo(
          sections * index,
          when(orientation, {
            Orientation.UP: 0.0 + depth,
            Orientation.UP_REVERSE: 0.0 + depth,
            Orientation.DOWN: size.height - depth,
            Orientation.DOWN_REVERSE: size.height - depth,
          }));
      path.quadraticBezierTo(
          (sections * index) + (sections / 2),
          when(orientation, {
            Orientation.UP: index % 2 == 0 ? 0.0 + depth * 3 : 0.0 - depth,
            Orientation.UP_REVERSE: index % 2 != 0 ? 0.0 + depth * 3 : 0.0 - depth,
            Orientation.DOWN: index % 2 == 0 ? size.height + depth : size.height - (depth * 3),
            Orientation.DOWN_REVERSE: index % 2 != 0 ? size.height + depth : size.height - (depth * 3),
          }),
          sections * (index + 1),
          when(orientation, {
            Orientation.UP: 0.0 + depth,
            Orientation.UP_REVERSE: 0.0 + depth,
            Orientation.DOWN: size.height - depth,
            Orientation.DOWN_REVERSE: size.height - depth,
          }));
    }
    path.lineTo(size.width, 0.0);
    if (orientation == Orientation.UP || orientation == Orientation.UP_REVERSE) {
      path.lineTo(size.width, size.height);
      path.lineTo(0.0, size.height);
    }
    path.close();
    return path;
  }

  @override
  bool shouldReclip(CustomClipper<Path> oldClipper) => true;
}

Type when<Input, Type>(Input selectedOption, Map<Input, Type> branches, [Type defaultValue]) {
  if (!branches.containsKey(selectedOption)) {
    return defaultValue;
  }
  return branches[selectedOption];
}