// 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.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Cursor;
using osu.Framework.Platform;
using osu.Game.Graphics;
using osu.Game.Graphics.Containers;
using osu.Game.Graphics.Sprites;
using osu.Game.Online.API.Requests.Responses;
using osu.Game.Overlays.News;
using osuTK;
using osuTK.Graphics;

namespace osu.Game.Overlays.Dashboard.Home.News
{
    public class HomeNewsPanel : HomePanel
    {
        private readonly APINewsPost post;

        public HomeNewsPanel(APINewsPost post)
        {
            this.post = post;
        }

        [BackgroundDependencyLoader]
        private void load()
        {
            Children = new Drawable[]
            {
                new FillFlowContainer
                {
                    RelativeSizeAxes = Axes.X,
                    AutoSizeAxes = Axes.Y,
                    Direction = FillDirection.Vertical,
                    Children = new Drawable[]
                    {
                        new ClickableNewsBackground(post),
                        new Footer(post)
                    }
                }
            };
        }

        private class ClickableNewsBackground : OsuHoverContainer
        {
            private readonly APINewsPost post;

            public ClickableNewsBackground(APINewsPost post)
            {
                this.post = post;

                RelativeSizeAxes = Axes.X;
                Height = 130;
            }

            [BackgroundDependencyLoader]
            private void load(GameHost host)
            {
                NewsPostBackground bg;

                Child = new DelayedLoadWrapper(bg = new NewsPostBackground(post.FirstImage)
                {
                    RelativeSizeAxes = Axes.Both,
                    FillMode = FillMode.Fill,
                    Anchor = Anchor.Centre,
                    Origin = Anchor.Centre,
                    Alpha = 0
                })
                {
                    RelativeSizeAxes = Axes.Both
                };

                bg.OnLoadComplete += d => d.FadeIn(250, Easing.In);

                TooltipText = "view in browser";
                Action = () => host.OpenUrlExternally("https://osu.ppy.sh/home/news/" + post.Slug);

                HoverColour = Color4.White;
            }
        }

        private class Footer : HomeNewsPanelFooter
        {
            protected override float BarPadding => 10;

            public Footer(APINewsPost post)
                : base(post)
            {
            }

            protected override Drawable CreateDate(DateTimeOffset date) => new Date(date);

            protected override Drawable CreateContent(APINewsPost post) => new FillFlowContainer
            {
                RelativeSizeAxes = Axes.X,
                AutoSizeAxes = Axes.Y,
                Margin = new MarginPadding { Top = 5, Bottom = 10 },
                Spacing = new Vector2(0, 10),
                Direction = FillDirection.Vertical,
                Children = new Drawable[]
                {
                    new NewsTitleLink(post),
                    new TextFlowContainer(f =>
                    {
                        f.Font = OsuFont.GetFont(size: 12, weight: FontWeight.Regular);
                    })
                    {
                        RelativeSizeAxes = Axes.X,
                        AutoSizeAxes = Axes.Y,
                        Text = post.Preview
                    }
                }
            };
        }

        private class Date : CompositeDrawable, IHasCustomTooltip
        {
            public ITooltip GetCustomTooltip() => new DateTooltip();

            public object TooltipContent => date;

            private readonly DateTimeOffset date;

            public Date(DateTimeOffset date)
            {
                this.date = date;
            }

            [BackgroundDependencyLoader]
            private void load(OverlayColourProvider colourProvider)
            {
                AutoSizeAxes = Axes.Both;
                Anchor = Anchor.TopRight;
                Origin = Anchor.TopRight;
                Margin = new MarginPadding { Top = 10 };
                InternalChild = new FillFlowContainer
                {
                    AutoSizeAxes = Axes.Both,
                    Direction = FillDirection.Vertical,
                    Anchor = Anchor.TopRight,
                    Origin = Anchor.TopRight,
                    Children = new Drawable[]
                    {
                        new OsuSpriteText
                        {
                            Anchor = Anchor.TopRight,
                            Origin = Anchor.TopRight,
                            Font = OsuFont.GetFont(weight: FontWeight.Bold), // using Bold since there is no 800 weight alternative
                            Colour = colourProvider.Light1,
                            Text = $"{date:dd}"
                        },
                        new TextFlowContainer(f =>
                        {
                            f.Font = OsuFont.GetFont(size: 11, weight: FontWeight.Regular);
                            f.Colour = colourProvider.Light1;
                        })
                        {
                            Anchor = Anchor.TopRight,
                            Origin = Anchor.TopRight,
                            AutoSizeAxes = Axes.Both,
                            Text = $"{date:MMM yyyy}"
                        }
                    }
                };
            }
        }
    }
}