using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Input;
using MrGameEng.Input;
using Xunit;

namespace MrGameEng.Input.Tests;

public class InputManagerTests
{
    private static MouseState Mouse(int x = 0, int y = 0, int wheel = 0, ButtonState left = ButtonState.Released) =>
        new(x, y, wheel, left, ButtonState.Released, ButtonState.Released, ButtonState.Released, ButtonState.Released);

    private static void Frame(InputManager input, KeyboardState keyboard = default, MouseState mouse = default) =>
        input.Apply(keyboard, mouse, GamePadState.Default);

    [Fact]
    public void KeyPressed_OnlyOnTheFrameItGoesDown()
    {
        var input = new InputManager();

        Frame(input, new KeyboardState(Keys.Space));
        Assert.True(input.IsKeyPressed(Keys.Space));
        Assert.True(input.IsKeyDown(Keys.Space));

        Frame(input, new KeyboardState(Keys.Space));
        Assert.False(input.IsKeyPressed(Keys.Space));
        Assert.True(input.IsKeyDown(Keys.Space));
    }

    [Fact]
    public void KeyReleased_OnlyOnTheFrameItGoesUp()
    {
        var input = new InputManager();

        Frame(input, new KeyboardState(Keys.A));
        Frame(input);

        Assert.True(input.IsKeyReleased(Keys.A));
        Frame(input);
        Assert.False(input.IsKeyReleased(Keys.A));
    }

    [Fact]
    public void MouseDeltaAndWheelDelta_ComputedBetweenFrames()
    {
        var input = new InputManager();

        Frame(input, mouse: Mouse(x: 10, y: 10, wheel: 0));
        Frame(input, mouse: Mouse(x: 25, y: 5, wheel: 120));

        Assert.Equal(new Point(15, -5), input.MouseDelta);
        Assert.Equal(120, input.WheelDelta);
        Assert.Equal(new Point(25, 5), input.MousePosition);
    }

    [Fact]
    public void MousePressed_DetectsLeftButtonEdge()
    {
        var input = new InputManager();

        Frame(input, mouse: Mouse());
        Frame(input, mouse: Mouse(left: ButtonState.Pressed));

        Assert.True(input.IsMousePressed(MouseButton.Left));
        Assert.False(input.IsMousePressed(MouseButton.Right));
    }
}