// 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 Humanizer;
using osu.Framework.Allocation;
using osu.Framework.Bindables;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Sprites;
using osu.Framework.Input.Events;
using osu.Game.Graphics;
using osu.Game.Online.API.Requests.Responses;
using osu.Framework.Graphics.UserInterface;
using osu.Game.Graphics.Sprites;
using osu.Game.Graphics.UserInterface;
using osuTK;

namespace osu.Game.Overlays.Changelog
{
    public class UpdateStreamBadge : TabItem<APIUpdateStream>
    {
        private const float badge_width = 100;
        private const float transition_duration = 100;

        public readonly Bindable<APIUpdateStream> SelectedTab = new Bindable<APIUpdateStream>();

        private readonly APIUpdateStream stream;

        private Container fadeContainer;
        private FillFlowContainer<SpriteText> text;
        private ExpandingBar expandingBar;

        public UpdateStreamBadge(APIUpdateStream stream)
            : base(stream)
        {
            this.stream = stream;
        }

        [BackgroundDependencyLoader]
        private void load(OverlayColourProvider colourProvider)
        {
            Size = new Vector2(stream.IsFeatured ? badge_width * 2 : badge_width, 60);
            Padding = new MarginPadding(5);

            AddRange(new Drawable[]
            {
                fadeContainer = new Container
                {
                    RelativeSizeAxes = Axes.Both,
                    Children = new Drawable[]
                    {
                        text = new FillFlowContainer<SpriteText>
                        {
                            AutoSizeAxes = Axes.X,
                            RelativeSizeAxes = Axes.Y,
                            Direction = FillDirection.Vertical,
                            Margin = new MarginPadding { Top = 6 },
                            Children = new[]
                            {
                                new OsuSpriteText
                                {
                                    Text = stream.DisplayName,
                                    Font = OsuFont.GetFont(size: 12, weight: FontWeight.Black),
                                },
                                new OsuSpriteText
                                {
                                    Text = stream.LatestBuild.DisplayVersion,
                                    Font = OsuFont.GetFont(size: 16, weight: FontWeight.Regular),
                                },
                                new OsuSpriteText
                                {
                                    Text = stream.LatestBuild.Users > 0 ? $"{stream.LatestBuild.Users:N0} {"user".Pluralize(stream.LatestBuild.Users == 1)} online" : null,
                                    Font = OsuFont.GetFont(size: 10),
                                    Colour = colourProvider.Foreground1
                                },
                            }
                        },
                        expandingBar = new ExpandingBar
                        {
                            Anchor = Anchor.TopCentre,
                            Colour = stream.Colour,
                            ExpandedSize = 4,
                            CollapsedSize = 2,
                            IsCollapsed = true
                        },
                    }
                },
                new HoverClickSounds()
            });

            SelectedTab.BindValueChanged(_ => updateState(), true);
        }

        protected override void OnActivated() => updateState();

        protected override void OnDeactivated() => updateState();

        protected override bool OnHover(HoverEvent e)
        {
            updateState();
            return base.OnHover(e);
        }

        protected override void OnHoverLost(HoverLostEvent e)
        {
            updateState();
            base.OnHoverLost(e);
        }

        private void updateState()
        {
            // Expand based on the local state
            bool shouldExpand = Active.Value || IsHovered;

            // Expand based on whether no build is selected and the badge area is hovered
            shouldExpand |= SelectedTab.Value == null && !externalDimRequested;

            if (shouldExpand)
            {
                expandingBar.Expand();
                fadeContainer.FadeTo(1, transition_duration);
            }
            else
            {
                expandingBar.Collapse();
                fadeContainer.FadeTo(0.5f, transition_duration);
            }

            text.FadeTo(externalDimRequested && !IsHovered ? 0.5f : 1, transition_duration);
        }

        private bool externalDimRequested;

        public void EnableDim()
        {
            externalDimRequested = true;
            updateState();
        }

        public void DisableDim()
        {
            externalDimRequested = false;
            updateState();
        }
    }
}