// 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.

#nullable disable

using System;
using osuTK.Graphics;
using osu.Framework.Allocation;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Cursor;
using osu.Framework.Graphics.Sprites;
using osu.Game.Graphics;
using osu.Game.Graphics.Sprites;
using osu.Game.Rulesets.Mods;
using osuTK;
using osu.Framework.Bindables;
using osu.Framework.Localisation;

namespace osu.Game.Rulesets.UI
{
    /// <summary>
    /// Display the specified mod at a fixed size.
    /// </summary>
    public class ModIcon : Container, IHasTooltip
    {
        public readonly BindableBool Selected = new BindableBool();

        private readonly SpriteIcon modIcon;
        private readonly SpriteText modAcronym;
        private readonly SpriteIcon background;

        private const float size = 80;

        public virtual LocalisableString TooltipText => showTooltip ? ((mod as Mod)?.IconTooltip ?? mod.Name) : null;

        private IMod mod;
        private readonly bool showTooltip;

        public IMod Mod
        {
            get => mod;
            set
            {
                mod = value;

                if (IsLoaded)
                    updateMod(value);
            }
        }

        [Resolved]
        private OsuColour colours { get; set; }

        private Color4 backgroundColour;
        private Color4 highlightedColour;

        /// <summary>
        /// Construct a new instance.
        /// </summary>
        /// <param name="mod">The mod to be displayed</param>
        /// <param name="showTooltip">Whether a tooltip describing the mod should display on hover.</param>
        public ModIcon(IMod mod, bool showTooltip = true)
        {
            this.mod = mod ?? throw new ArgumentNullException(nameof(mod));
            this.showTooltip = showTooltip;

            Size = new Vector2(size);

            Children = new Drawable[]
            {
                background = new SpriteIcon
                {
                    Origin = Anchor.Centre,
                    Anchor = Anchor.Centre,
                    Size = new Vector2(size),
                    Icon = OsuIcon.ModBg,
                    Shadow = true,
                },
                modAcronym = new OsuSpriteText
                {
                    Origin = Anchor.Centre,
                    Anchor = Anchor.Centre,
                    Colour = OsuColour.Gray(84),
                    Alpha = 0,
                    Font = OsuFont.Numeric.With(null, 22f),
                    UseFullGlyphHeight = false,
                    Text = mod.Acronym
                },
                modIcon = new SpriteIcon
                {
                    Origin = Anchor.Centre,
                    Anchor = Anchor.Centre,
                    Colour = OsuColour.Gray(84),
                    Size = new Vector2(45),
                    Icon = FontAwesome.Solid.Question
                },
            };
        }

        protected override void LoadComplete()
        {
            base.LoadComplete();

            Selected.BindValueChanged(_ => updateColour());

            updateMod(mod);
        }

        private void updateMod(IMod value)
        {
            modAcronym.Text = value.Acronym;
            modIcon.Icon = value.Icon ?? FontAwesome.Solid.Question;

            if (value.Icon is null)
            {
                modIcon.FadeOut();
                modAcronym.FadeIn();
            }
            else
            {
                modIcon.FadeIn();
                modAcronym.FadeOut();
            }

            Color4 typeColour = colours.ForModType(value.Type);
            backgroundColour = typeColour;
            highlightedColour = ((Colour4)typeColour).Lighten(.2f);

            if (value.Type == ModType.System)
                modIcon.Colour = colours.Yellow;

            updateColour();
        }

        private void updateColour()
        {
            background.Colour = Selected.Value ? highlightedColour : backgroundColour;
        }
    }
}