using System.Collections.Generic;
using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.UnitTests;
using Xunit;

namespace Avalonia.Interactivity.UnitTests
{
    public class GesturesTests
    {
        private MouseTestHelper _mouse = new MouseTestHelper();
        
        [Fact]
        public void Tapped_Should_Follow_Pointer_Pressed_Released()
        {
            Border border = new Border();
            var decorator = new Decorator
            {
                Child = border
            };
            var result = new List<string>();

            AddHandlers(decorator, border, result, false);

            _mouse.Click(border);

            Assert.Equal(new[] { "bp", "dp", "br", "dr", "bt", "dt" }, result);
        }

        [Fact]
        public void Tapped_Should_Be_Raised_Even_When_Pressed_Released_Handled()
        {
            Border border = new Border();
            var decorator = new Decorator
            {
                Child = border
            };
            var result = new List<string>();

            AddHandlers(decorator, border, result, true);

            _mouse.Click(border);

            Assert.Equal(new[] { "bp", "dp", "br", "dr", "bt", "dt" }, result);
        }

        [Fact]
        public void Tapped_Should_Be_Raised_For_Middle_Button()
        {
            Border border = new Border();
            var decorator = new Decorator
            {
                Child = border
            };
            var raised = false;

            decorator.AddHandler(Gestures.TappedEvent, (s, e) => raised = true);

            _mouse.Click(border, MouseButton.Middle);

            Assert.True(raised);
        }

        [Fact]
        public void Tapped_Should_Not_Be_Raised_For_Right_Button()
        {
            Border border = new Border();
            var decorator = new Decorator
            {
                Child = border
            };
            var raised = false;

            decorator.AddHandler(Gestures.TappedEvent, (s, e) => raised = true);

            _mouse.Click(border, MouseButton.Right);

            Assert.False(raised);
        }

        [Fact]
        public void RightTapped_Should_Be_Raised_For_Right_Button()
        {
            Border border = new Border();
            var decorator = new Decorator
            {
                Child = border
            };
            var raised = false;

            decorator.AddHandler(Gestures.RightTappedEvent, (s, e) => raised = true);

            _mouse.Click(border, MouseButton.Right);

            Assert.True(raised);
        }

        [Fact]
        public void DoubleTapped_Should_Follow_Pointer_Pressed_Released_Pressed()
        {
            Border border = new Border();
            var decorator = new Decorator
            {
                Child = border
            };
            var result = new List<string>();

            AddHandlers(decorator, border, result, false);

            _mouse.Click(border);
            _mouse.Down(border, clickCount: 2);

            Assert.Equal(new[] { "bp", "dp", "br", "dr", "bt", "dt", "bp", "dp", "bdt", "ddt" }, result);
        }

        [Fact]
        public void DoubleTapped_Should_Be_Raised_Even_When_Pressed_Released_Handled()
        {
            Border border = new Border();
            var decorator = new Decorator
            {
                Child = border
            };
            var result = new List<string>();

            AddHandlers(decorator, border, result, true);

            _mouse.Click(border);
            _mouse.Down(border, clickCount: 2);

            Assert.Equal(new[] { "bp", "dp", "br", "dr", "bt", "dt", "bp", "dp", "bdt", "ddt" }, result);
        }

        [Fact]
        public void DoubleTapped_Should_Not_Be_Raised_For_Middle_Button()
        {
            Border border = new Border();
            var decorator = new Decorator
            {
                Child = border
            };
            var raised = false;

            decorator.AddHandler(Gestures.DoubleTappedEvent, (s, e) => raised = true);

            _mouse.Click(border, MouseButton.Middle);
            _mouse.Down(border, MouseButton.Middle, clickCount: 2);

            Assert.False(raised);
        }

        [Fact]
        public void DoubleTapped_Should_Not_Be_Raised_For_Right_Button()
        {
            Border border = new Border();
            var decorator = new Decorator
            {
                Child = border
            };
            var raised = false;

            decorator.AddHandler(Gestures.DoubleTappedEvent, (s, e) => raised = true);

            _mouse.Click(border, MouseButton.Right);
            _mouse.Down(border, MouseButton.Right, clickCount: 2);

            Assert.False(raised);
        }

        private void AddHandlers(
            Decorator decorator,
            Border border,
            IList<string> result,
            bool markHandled)
        {
            decorator.AddHandler(Border.PointerPressedEvent, (s, e) =>
            {
                result.Add("dp");

                if (markHandled)
                {
                    e.Handled = true;
                }
            });

            decorator.AddHandler(Border.PointerReleasedEvent, (s, e) =>
            {
                result.Add("dr");

                if (markHandled)
                {
                    e.Handled = true;
                }
            });

            border.AddHandler(Border.PointerPressedEvent, (s, e) => result.Add("bp"));
            border.AddHandler(Border.PointerReleasedEvent, (s, e) => result.Add("br"));

            decorator.AddHandler(Gestures.TappedEvent, (s, e) => result.Add("dt"));
            decorator.AddHandler(Gestures.DoubleTappedEvent, (s, e) => result.Add("ddt"));
            border.AddHandler(Gestures.TappedEvent, (s, e) => result.Add("bt"));
            border.AddHandler(Gestures.DoubleTappedEvent, (s, e) => result.Add("bdt"));
        }
    }
}