// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.

using System;
using osu.Framework.Allocation;
using osu.Framework.Configuration.Tracking;
using osu.Framework.Extensions.Color4Extensions;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Effects;
using osu.Framework.Graphics.Shapes;
using osu.Framework.Graphics.Sprites;
using osu.Game.Graphics;
using osu.Game.Graphics.Sprites;
using osuTK;
using osuTK.Graphics;

namespace osu.Game.Overlays.OSD
{
    public class TrackedSettingToast : Toast
    {
        public TrackedSettingToast(SettingDescription description)
        {
            SpriteText textLine2;
            FillFlowContainer<OptionLight> optionLights;

            Children = new Drawable[]
            {
                new OsuSpriteText
                {
                    Padding = new MarginPadding(10),
                    Font = OsuFont.GetFont(size: 14, weight: FontWeight.Black),
                    Spacing = new Vector2(1, 0),
                    Anchor = Anchor.TopCentre,
                    Origin = Anchor.TopCentre,
                    Text = description.Name.ToUpperInvariant()
                },
                textLine2 = new OsuSpriteText
                {
                    Font = OsuFont.GetFont(size: 24, weight: FontWeight.Light),
                    Padding = new MarginPadding { Left = 10, Right = 10 },
                    Anchor = Anchor.Centre,
                    Origin = Anchor.BottomCentre,
                    Text = description.Value
                },
                new FillFlowContainer
                {
                    Anchor = Anchor.BottomCentre,
                    Origin = Anchor.BottomCentre,
                    AutoSizeAxes = Axes.Both,
                    Direction = FillDirection.Vertical,
                    Children = new Drawable[]
                    {
                        optionLights = new FillFlowContainer<OptionLight>
                        {
                            Padding = new MarginPadding { Top = 20, Bottom = 5 },
                            Spacing = new Vector2(5, 0),
                            Direction = FillDirection.Horizontal,
                            Anchor = Anchor.TopCentre,
                            Origin = Anchor.TopCentre,
                            AutoSizeAxes = Axes.Both
                        },
                        new OsuSpriteText
                        {
                            Anchor = Anchor.TopCentre,
                            Origin = Anchor.TopCentre,
                            Margin = new MarginPadding { Bottom = 15 },
                            Font = OsuFont.GetFont(size: 12, weight: FontWeight.Bold),
                            Alpha = 0.3f,
                            Text = string.IsNullOrEmpty(description.Shortcut) ? "NO KEY BOUND" : description.Shortcut.ToUpperInvariant()
                        },
                    }
                }
            };

            int optionCount = 0;
            int selectedOption = -1;

            switch (description.RawValue)
            {
                case bool val:
                    optionCount = 1;
                    if (val) selectedOption = 0;
                    break;

                case Enum _:
                    var values = Enum.GetValues(description.RawValue.GetType());
                    optionCount = values.Length;
                    selectedOption = Convert.ToInt32(description.RawValue);
                    break;
            }

            textLine2.Origin = optionCount > 0 ? Anchor.BottomCentre : Anchor.Centre;
            textLine2.Y = optionCount > 0 ? 0 : 5;

            for (int i = 0; i < optionCount; i++)
            {
                optionLights.Add(new OptionLight
                {
                    Glowing = i == selectedOption
                });
            }
        }

        private class OptionLight : Container
        {
            private Color4 glowingColour, idleColour;

            private const float transition_speed = 300;

            private const float glow_strength = 0.4f;

            private readonly Box fill;

            public OptionLight()
            {
                Children = new[]
                {
                    fill = new Box
                    {
                        RelativeSizeAxes = Axes.Both,
                        Alpha = 1,
                    },
                };
            }

            private bool glowing;

            public bool Glowing
            {
                set
                {
                    glowing = value;
                    if (!IsLoaded) return;

                    updateGlow();
                }
            }

            private void updateGlow()
            {
                if (glowing)
                {
                    fill.FadeColour(glowingColour, transition_speed, Easing.OutQuint);
                    FadeEdgeEffectTo(glow_strength, transition_speed, Easing.OutQuint);
                }
                else
                {
                    FadeEdgeEffectTo(0, transition_speed, Easing.OutQuint);
                    fill.FadeColour(idleColour, transition_speed, Easing.OutQuint);
                }
            }

            [BackgroundDependencyLoader]
            private void load(OsuColour colours)
            {
                fill.Colour = idleColour = Color4.White.Opacity(0.4f);
                glowingColour = Color4.White;

                Size = new Vector2(25, 5);

                Masking = true;
                CornerRadius = 3;

                EdgeEffect = new EdgeEffectParameters
                {
                    Colour = colours.BlueDark.Opacity(glow_strength),
                    Type = EdgeEffectType.Glow,
                    Radius = 8,
                };
            }

            protected override void LoadComplete()
            {
                updateGlow();
                FinishTransforms(true);
            }
        }
    }
}