using System;
using OpenTK;
using OpenTK.Input;
using OpenTK.Graphics;
using osu.Game.Graphics;
using osu.Framework.Input;
using osu.Framework.Allocation;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Sprites;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Transformations;
using System.Threading.Tasks;

namespace osu.Game.Overlays.Pause
{
    public class PauseOverlay : OverlayContainer
    {
        private const int fadeDuration = 200;
        private const int buttonHeight = 70;

        public Action OnResume;
        public Action OnRetry;
        public Action OnQuit;

        private SpriteText retryCounter;

        public override bool Contains(Vector2 screenSpacePos) => true;
        public override bool HandleInput => State == Visibility.Visible;

        protected override void PopIn() => FadeIn(fadeDuration, EasingTypes.In);
        protected override void PopOut() => FadeOut(fadeDuration, EasingTypes.In);

        protected override bool OnKeyDown(InputState state, KeyDownEventArgs args)
        {
            switch (args.Key)
            {
                case Key.Escape:
                    if (State == Visibility.Hidden) return false;
                    Hide();
                    Task.Delay(fadeDuration * 2).ContinueWith(task => OnResume?.Invoke());
                    return true;
            }
            return base.OnKeyDown(state, args);
        }

        [BackgroundDependencyLoader]
        private void load(OsuColour colours)
        {
            Children = new Drawable[]
            {
                new Container
                {
                    RelativeSizeAxes = Axes.Both,

                    Children = new Drawable[]
                    {
                        new Box
                        {
                            RelativeSizeAxes = Axes.Both,
                            Colour = Color4.Black,
                            Alpha = 0.75f,
                        }
                    }
                },
                new SpriteText
                {
                    Text = @"paused",
                    Origin = Anchor.BottomCentre,
                    Anchor = Anchor.Centre,
                    Position = new Vector2(0, -175),
                    Font = @"Exo2.0-Medium",
                    Spacing = new Vector2(5, 0),
                    TextSize = 30,
                    Colour = colours.Yellow,
                    Shadow = true,
                    ShadowColour = new Color4(0, 0, 0, 0.25f),
                },
                new SpriteText
                {
                    Text = @"you're not going to do what i think you're going to do, ain't ya?",
                    Origin = Anchor.BottomCentre,
                    Anchor = Anchor.Centre,
                    Width = 100,
                    Position = new Vector2(0, -125),
                    Shadow = true,
                    ShadowColour = new Color4(0, 0, 0, 0.25f),
                },
                retryCounter = new SpriteText
                {
                    Origin = Anchor.TopCentre,
                    Anchor = Anchor.Centre,
                    Width = 100,
                    Position = new Vector2(0, 175),
                    Shadow = true,
                    ShadowColour = new Color4(0, 0, 0, 0.25f),
                    TextSize = 18,
                },
                new PauseProgressBar
                {
                    Origin = Anchor.BottomCentre,
                    Anchor = Anchor.BottomCentre,
                    Width = 1f,
                },
                new FlowContainer
                {
                    RelativeSizeAxes = Axes.X,
                    AutoSizeAxes = Axes.Y,
                    Origin = Anchor.Centre,
                    Anchor = Anchor.Centre,
                    Position = new Vector2(0, 25),
                    Masking = true,
                    EdgeEffect = new EdgeEffect
                    {
                        Type = EdgeEffectType.Shadow,
                        Colour = new Color4(0, 0, 0, 150),
                        Radius = 50,
                        Offset = new Vector2(0, 0),
                    },
                    Children = new Drawable[]
                    {
                        new PauseButton
                        {
                            Type = PauseButtonType.Resume,
                            RelativeSizeAxes = Axes.X,
                            Origin = Anchor.TopCentre,
                            Anchor = Anchor.TopCentre,
                            Height = buttonHeight,
                            Action = (delegate
                            {
                                Hide();
                                Task.Delay(fadeDuration * 2).ContinueWith(task => OnResume?.Invoke());
                            }),
                        },
                        new PauseButton
                        {
                            Type = PauseButtonType.Retry,
                            RelativeSizeAxes = Axes.X,
                            Origin = Anchor.TopCentre,
                            Anchor = Anchor.TopCentre,
                            Height = buttonHeight,
                            Action = (delegate
                            {
                                Hide();
                                OnRetry?.Invoke();
                            }),
                        },
                        new PauseButton
                        {
                            Type = PauseButtonType.Quit,
                            RelativeSizeAxes = Axes.X,
                            Origin = Anchor.TopCentre,
                            Anchor = Anchor.TopCentre,
                            Height = buttonHeight,
                            Action = (delegate
                            {
                                Hide();
                                OnQuit?.Invoke();
                            }),
                        },
                    }
                },
            };

            SetRetries(0);
        }

        public void SetRetries(int count)
        {
            if (retryCounter != null)
                // "You've retried 1,065 times in this session"
                // "You've retried 1 time in this session"
                retryCounter.Text = $"You've retried {String.Format("{0:n0}", count)} time{(count == 1) ? "" : "s"} in this session";
        }

        public PauseOverlay()
        {
            RelativeSizeAxes = Axes.Both;
            AutoSizeAxes = Axes.Both;
        }
    }
}