// 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 osu.Framework.Graphics.Containers;
using osu.Framework.Graphics;
using osu.Game.Graphics;
using osu.Framework.Graphics.Sprites;
using osuTK;
using osu.Game.Online.API.Requests.Responses;
using osu.Game.Users.Drawables;
using osu.Game.Graphics.Containers;
using osu.Game.Utils;
using osu.Framework.Input.Events;
using System;

namespace osu.Game.Overlays.Comments
{
    public class DrawableComment : CompositeDrawable
    {
        private const int avatar_size = 40;
        private const int margin = 10;
        private const int child_margin = 20;
        private const int duration = 200;

        private bool childExpanded = true;

        public bool ChildExpanded
        {
            get => childExpanded;
            set
            {
                if (childExpanded == value)
                    return;

                childExpanded = value;

                childCommentsVisibilityContainer.ClearTransforms();

                if (childExpanded)
                    childCommentsVisibilityContainer.AutoSizeAxes = Axes.Y;
                else
                {
                    childCommentsVisibilityContainer.AutoSizeAxes = Axes.None;
                    childCommentsVisibilityContainer.ResizeHeightTo(0, duration, Easing.OutQuint);
                }
            }
        }

        private readonly Container childCommentsVisibilityContainer;

        public DrawableComment(Comment comment)
        {
            LinkFlowContainer username;
            FillFlowContainer childCommentsContainer;
            RepliesButton replies;

            RelativeSizeAxes = Axes.X;
            AutoSizeAxes = Axes.Y;
            InternalChild = new FillFlowContainer
            {
                RelativeSizeAxes = Axes.X,
                AutoSizeAxes = Axes.Y,
                Direction = FillDirection.Vertical,
                Children = new Drawable[]
                {
                    new GridContainer
                    {
                        RelativeSizeAxes = Axes.X,
                        AutoSizeAxes = Axes.Y,
                        Margin = new MarginPadding(margin),
                        ColumnDimensions = new[]
                        {
                            new Dimension(GridSizeMode.AutoSize),
                            new Dimension(),
                        },
                        RowDimensions = new[]
                        {
                            new Dimension(GridSizeMode.AutoSize),
                            new Dimension(GridSizeMode.AutoSize)
                        },
                        Content = new[]
                        {
                            new Drawable[]
                            {
                                new UpdateableAvatar(comment.User)
                                {
                                    Size = new Vector2(avatar_size),
                                    Margin = new MarginPadding { Horizontal = margin },
                                    Masking = true,
                                    CornerRadius = avatar_size / 2,
                                },
                                new FillFlowContainer
                                {
                                    RelativeSizeAxes = Axes.X,
                                    AutoSizeAxes = Axes.Y,
                                    Margin = new MarginPadding { Top = margin / 2 },
                                    Spacing = new Vector2(0, 2),
                                    Children = new Drawable[]
                                    {
                                        username = new LinkFlowContainer(s => s.Font = OsuFont.GetFont(size: 14, weight: FontWeight.Bold, italics: true))
                                        {
                                            AutoSizeAxes = Axes.Both,
                                        },
                                        new TextFlowContainer(s => s.Font = OsuFont.GetFont(size: 14))
                                        {
                                            RelativeSizeAxes = Axes.X,
                                            AutoSizeAxes = Axes.Y,
                                            Text = comment.GetMessage()
                                        }
                                    }
                                }
                            },
                            new Drawable[]
                            {
                                new Container
                                {
                                    RelativeSizeAxes = Axes.Both,
                                },
                                new FillFlowContainer
                                {
                                    AutoSizeAxes = Axes.Both,
                                    Direction = FillDirection.Horizontal,
                                    Spacing = new Vector2(10, 0),
                                    Children = new Drawable[]
                                    {
                                        new SpriteText
                                        {
                                            Anchor = Anchor.CentreLeft,
                                            Origin = Anchor.CentreLeft,
                                            Font = OsuFont.GetFont(size: 12),
                                            Text = HumanizerUtils.Humanize(comment.CreatedAt)
                                        },
                                        replies = new RepliesButton(comment.RepliesCount),
                                    }
                                }
                            }
                        }
                    },
                    childCommentsVisibilityContainer = new Container
                    {
                        RelativeSizeAxes = Axes.X,
                        AutoSizeAxes = Axes.Y,
                        AutoSizeDuration = duration,
                        AutoSizeEasing = Easing.OutQuint,
                        Masking = true,
                        Child = childCommentsContainer = new FillFlowContainer
                        {
                            Margin = new MarginPadding { Left = child_margin },
                            RelativeSizeAxes = Axes.X,
                            AutoSizeAxes = Axes.Y,
                            Direction = FillDirection.Vertical
                        }
                    }
                }
            };

            username.AddUserLink(comment.User);

            comment.ChildComments.ForEach(c =>
            {
                if (!c.IsDeleted)
                    childCommentsContainer.Add(new DrawableComment(c));
            });

            replies.Action += expanded => ChildExpanded = expanded;
        }

        private class RepliesButton : Container
        {
            private readonly SpriteText text;
            private bool expanded;
            private readonly int count;

            public Action<bool> Action;

            public RepliesButton(int count)
            {
                this.count = count;

                AutoSizeAxes = Axes.Both;
                Alpha = count == 0 ? 0 : 1;
                Child = text = new SpriteText
                {
                    Font = OsuFont.GetFont(size: 12),
                    Text = $@"[-] replies ({count})"
                };

                expanded = true;
            }

            protected override bool OnClick(ClickEvent e)
            {
                text.Text = $@"{(expanded ? "[+]" : "[-]")} replies ({count})";
                expanded = !expanded;
                Action?.Invoke(expanded);
                return base.OnClick(e);
            }
        }
    }
}