// 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.Collections.Generic;
using System.Linq;
using osu.Framework.Allocation;
using osu.Framework.Extensions.IEnumerableExtensions;
using osu.Framework.Graphics;
using osu.Framework.Localisation;
using osu.Game.Database;
using osu.Game.Input.Bindings;
using osu.Game.Rulesets;
using osu.Game.Localisation;
using osuTK;

namespace osu.Game.Overlays.Settings.Sections.Input
{
    public abstract partial class KeyBindingsSubsection : SettingsSubsection
    {
        /// <summary>
        /// After a successful binding, automatically select the next binding row to make quickly
        /// binding a large set of keys easier on the user.
        /// </summary>
        protected virtual bool AutoAdvanceTarget => false;

        protected IEnumerable<Framework.Input.Bindings.KeyBinding> Defaults;

        public RulesetInfo Ruleset { get; protected set; }

        private readonly int? variant;

        protected KeyBindingsSubsection(int? variant)
        {
            this.variant = variant;

            FlowContent.Spacing = new Vector2(0, 3);
        }

        [BackgroundDependencyLoader]
        private void load(RealmAccess realm)
        {
            string rulesetName = Ruleset?.ShortName;

            var bindings = realm.Run(r => r.All<RealmKeyBinding>()
                                           .Where(b => b.RulesetName == rulesetName && b.Variant == variant)
                                           .Detach());

            foreach (var defaultGroup in Defaults.GroupBy(d => d.Action))
            {
                int intKey = (int)defaultGroup.Key;

                // one row per valid action.
                Add(new KeyBindingRow(defaultGroup.Key, bindings.Where(b => b.ActionInt.Equals(intKey)).ToList())
                {
                    AllowMainMouseButtons = Ruleset != null,
                    Defaults = defaultGroup.Select(d => d.KeyCombination),
                    BindingUpdated = onBindingUpdated
                });
            }

            Add(new ResetButton
            {
                Action = () => Children.OfType<KeyBindingRow>().ForEach(k => k.RestoreDefaults())
            });
        }

        private void onBindingUpdated(KeyBindingRow sender)
        {
            if (AutoAdvanceTarget)
            {
                var next = Children.SkipWhile(c => c != sender).Skip(1).FirstOrDefault();
                if (next != null)
                    GetContainingInputManager().ChangeFocus(next);
            }
        }
    }

    public partial class ResetButton : DangerousSettingsButton
    {
        [BackgroundDependencyLoader]
        private void load()
        {
            Text = InputSettingsStrings.ResetSectionButton;
            RelativeSizeAxes = Axes.X;
            Width = 0.8f;
            Anchor = Anchor.TopCentre;
            Origin = Anchor.TopCentre;
            Margin = new MarginPadding { Top = 15 };
            Height = 30;

            Content.CornerRadius = 5;
        }

        // Empty FilterTerms so that the ResetButton is visible only when the whole subsection is visible.
        public override IEnumerable<LocalisableString> FilterTerms => Enumerable.Empty<LocalisableString>();
    }
}