// 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 System.Collections.Generic;
using System.Linq;
using JetBrains.Annotations;
using osu.Framework.Allocation;
using osu.Framework.Bindables;
using osu.Framework.Extensions;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Cursor;
using osu.Framework.Graphics.Sprites;
using osu.Framework.Graphics.UserInterface;
using osu.Framework.Localisation;
using osu.Framework.Logging;
using osu.Game.Database;
using osu.Game.Graphics;
using osu.Game.Graphics.UserInterface;
using osu.Game.Graphics.UserInterfaceV2;
using osu.Game.Localisation;
using osu.Game.Overlays.SkinEditor;
using osu.Game.Screens.Select;
using osu.Game.Skinning;
using osuTK;
using Realms;

namespace osu.Game.Overlays.Settings.Sections
{
    public partial class SkinSection : SettingsSection
    {
        private SkinSettingsDropdown skinDropdown;

        public override LocalisableString Header => SkinSettingsStrings.SkinSectionHeader;

        public override Drawable CreateIcon() => new SpriteIcon
        {
            Icon = OsuIcon.SkinB
        };

        private static readonly Live<SkinInfo> random_skin_info = new SkinInfo
        {
            ID = SkinInfo.RANDOM_SKIN,
            Name = "<Random Skin>",
        }.ToLiveUnmanaged();

        private readonly List<Live<SkinInfo>> dropdownItems = new List<Live<SkinInfo>>();

        [Resolved]
        private SkinManager skins { get; set; }

        [Resolved]
        private RealmAccess realm { get; set; }

        private IDisposable realmSubscription;

        [BackgroundDependencyLoader(permitNulls: true)]
        private void load([CanBeNull] SkinEditorOverlay skinEditor)
        {
            Children = new Drawable[]
            {
                skinDropdown = new SkinSettingsDropdown
                {
                    AlwaysShowSearchBar = true,
                    AllowNonContiguousMatching = true,
                    LabelText = SkinSettingsStrings.CurrentSkin,
                    Current = skins.CurrentSkinInfo,
                    Keywords = new[] { @"skins" },
                },
                new SettingsButton
                {
                    Text = SkinSettingsStrings.SkinLayoutEditor,
                    Action = () => skinEditor?.ToggleVisibility(),
                },
                new FillFlowContainer
                {
                    RelativeSizeAxes = Axes.X,
                    AutoSizeAxes = Axes.Y,
                    Direction = FillDirection.Horizontal,
                    Spacing = new Vector2(5, 0),
                    Padding = new MarginPadding { Left = SettingsPanel.CONTENT_MARGINS, Right = SettingsPanel.CONTENT_MARGINS },
                    Children = new Drawable[]
                    {
                        // This is all super-temporary until we move skin settings to their own panel / overlay.
                        new RenameSkinButton { Padding = new MarginPadding(), RelativeSizeAxes = Axes.None, Width = 120 },
                        new ExportSkinButton { Padding = new MarginPadding(), RelativeSizeAxes = Axes.None, Width = 120 },
                        new DeleteSkinButton { Padding = new MarginPadding(), RelativeSizeAxes = Axes.None, Width = 110 },
                    }
                },
            };
        }

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

            realmSubscription = realm.RegisterForNotifications(_ => realm.Realm.All<SkinInfo>()
                                                                         .Where(s => !s.DeletePending)
                                                                         .OrderBy(s => s.Name, StringComparer.OrdinalIgnoreCase), skinsChanged);

            skinDropdown.Current.BindValueChanged(skin =>
            {
                if (skin.NewValue == random_skin_info)
                {
                    // before selecting random, set the skin back to the previous selection.
                    // this is done because at this point it will be random_skin_info, and would
                    // cause SelectRandomSkin to be unable to skip the previous selection.
                    skins.CurrentSkinInfo.Value = skin.OldValue;
                    skins.SelectRandomSkin();
                }
            });
        }

        private void skinsChanged(IRealmCollection<SkinInfo> sender, ChangeSet changes)
        {
            // This can only mean that realm is recycling, else we would see the protected skins.
            // Because we are using `Live<>` in this class, we don't need to worry about this scenario too much.
            if (!sender.Any())
                return;

            // For simplicity repopulate the full list.
            // In the future we should change this to properly handle ChangeSet events.
            dropdownItems.Clear();

            dropdownItems.Add(sender.Single(s => s.ID == SkinInfo.ARGON_SKIN).ToLive(realm));
            dropdownItems.Add(sender.Single(s => s.ID == SkinInfo.ARGON_PRO_SKIN).ToLive(realm));
            dropdownItems.Add(sender.Single(s => s.ID == SkinInfo.TRIANGLES_SKIN).ToLive(realm));
            dropdownItems.Add(sender.Single(s => s.ID == SkinInfo.CLASSIC_SKIN).ToLive(realm));

            dropdownItems.Add(random_skin_info);

            foreach (var skin in sender.Where(s => !s.Protected))
                dropdownItems.Add(skin.ToLive(realm));

            Schedule(() => skinDropdown.Items = dropdownItems);
        }

        protected override void Dispose(bool isDisposing)
        {
            base.Dispose(isDisposing);

            realmSubscription?.Dispose();
        }

        private partial class SkinSettingsDropdown : SettingsDropdown<Live<SkinInfo>>
        {
            protected override OsuDropdown<Live<SkinInfo>> CreateDropdown() => new SkinDropdownControl();

            private partial class SkinDropdownControl : DropdownControl
            {
                protected override LocalisableString GenerateItemText(Live<SkinInfo> item) => item.ToString();
            }
        }

        public partial class RenameSkinButton : SettingsButton, IHasPopover
        {
            [Resolved]
            private SkinManager skins { get; set; }

            private Bindable<Skin> currentSkin;

            [BackgroundDependencyLoader]
            private void load()
            {
                Text = "Rename";
                Action = this.ShowPopover;
            }

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

                currentSkin = skins.CurrentSkin.GetBoundCopy();
                currentSkin.BindValueChanged(skin => Enabled.Value = skin.NewValue.SkinInfo.PerformRead(s => !s.Protected), true);
            }

            public Popover GetPopover()
            {
                return new RenameSkinPopover();
            }
        }

        public partial class ExportSkinButton : SettingsButton
        {
            [Resolved]
            private SkinManager skins { get; set; }

            private Bindable<Skin> currentSkin;

            [BackgroundDependencyLoader]
            private void load()
            {
                Text = "Export";
                Action = export;
            }

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

                currentSkin = skins.CurrentSkin.GetBoundCopy();
                currentSkin.BindValueChanged(skin => Enabled.Value = skin.NewValue.SkinInfo.PerformRead(s => !s.Protected), true);
            }

            private void export()
            {
                try
                {
                    skins.ExportCurrentSkin();
                }
                catch (Exception e)
                {
                    Logger.Log($"Could not export current skin: {e.Message}", level: LogLevel.Error);
                }
            }
        }

        public partial class DeleteSkinButton : DangerousSettingsButton
        {
            [Resolved]
            private SkinManager skins { get; set; }

            [Resolved(CanBeNull = true)]
            private IDialogOverlay dialogOverlay { get; set; }

            private Bindable<Skin> currentSkin;

            [BackgroundDependencyLoader]
            private void load()
            {
                Text = "Delete";
                Action = delete;
            }

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

                currentSkin = skins.CurrentSkin.GetBoundCopy();
                currentSkin.BindValueChanged(skin => Enabled.Value = skin.NewValue.SkinInfo.PerformRead(s => !s.Protected), true);
            }

            private void delete()
            {
                dialogOverlay?.Push(new SkinDeleteDialog(currentSkin.Value));
            }
        }

        public partial class RenameSkinPopover : OsuPopover
        {
            [Resolved]
            private SkinManager skins { get; set; }

            private readonly FocusedTextBox textBox;

            public RenameSkinPopover()
            {
                AutoSizeAxes = Axes.Both;
                Origin = Anchor.TopCentre;

                RoundedButton renameButton;

                Child = new FillFlowContainer
                {
                    Direction = FillDirection.Vertical,
                    AutoSizeAxes = Axes.Y,
                    Width = 250,
                    Spacing = new Vector2(10f),
                    Children = new Drawable[]
                    {
                        textBox = new FocusedTextBox
                        {
                            PlaceholderText = @"Skin name",
                            FontSize = OsuFont.DEFAULT_FONT_SIZE,
                            RelativeSizeAxes = Axes.X,
                            SelectAllOnFocus = true,
                        },
                        renameButton = new RoundedButton
                        {
                            Height = 40,
                            RelativeSizeAxes = Axes.X,
                            MatchingFilter = true,
                            Text = "Save",
                        }
                    }
                };

                renameButton.Action += rename;
                textBox.OnCommit += (_, _) => rename();
            }

            protected override void PopIn()
            {
                textBox.Text = skins.CurrentSkinInfo.Value.Value.Name;
                textBox.TakeFocus();

                base.PopIn();
            }

            private void rename() => skins.CurrentSkinInfo.Value.PerformWrite(skin =>
            {
                skin.Name = textBox.Text;
                PopOut();
            });
        }
    }
}