using Content.Shared.Instruments;
using Robust.Client.AutoGenerated;
using Robust.Client.UserInterface.Controls;
using Robust.Client.UserInterface.CustomControls;
using Robust.Client.UserInterface.XAML;
using Robust.Shared.Audio.Midi;
using Robust.Shared.Utility;

namespace Content.Client.Instruments.UI;

[GenerateTypedNameReferences]
public sealed partial class ChannelsMenu : DefaultWindow
{
    [Dependency] private readonly IEntityManager _entityManager = null!;

    private readonly InstrumentBoundUserInterface _owner;

    public ChannelsMenu(InstrumentBoundUserInterface owner) : base()
    {
        RobustXamlLoader.Load(this);
        IoCManager.InjectDependencies(this);
        _owner = owner;

        ChannelList.OnItemSelected += OnItemSelected;
        ChannelList.OnItemDeselected += OnItemDeselected;
        AllButton.OnPressed += OnAllPressed;
        ClearButton.OnPressed += OnClearPressed;
        DisplayTrackNames.OnPressed += OnDisplayTrackNamesPressed;
    }

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

        _owner.Instruments.OnChannelsUpdated += UpdateChannelList;
    }

    private void OnDisplayTrackNamesPressed(BaseButton.ButtonEventArgs obj)
    {
        DisplayTrackNames.SetClickPressed(!DisplayTrackNames.Pressed);
        Populate();
    }

    private void UpdateChannelList()
    {
        Populate(); // This is kind of in-efficent because we don't filter for which instrument updated its channels, but idc
    }

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

        _owner.Instruments.OnChannelsUpdated -= UpdateChannelList;
    }

    private void OnItemSelected(ItemList.ItemListSelectedEventArgs args)
    {
        _owner.Instruments.SetFilteredChannel(_owner.Owner, (int)ChannelList[args.ItemIndex].Metadata!, false);
    }

    private void OnItemDeselected(ItemList.ItemListDeselectedEventArgs args)
    {
        _owner.Instruments.SetFilteredChannel(_owner.Owner, (int)ChannelList[args.ItemIndex].Metadata!, true);
    }

    private void OnAllPressed(BaseButton.ButtonEventArgs obj)
    {
        foreach (var item in ChannelList)
        {
            // TODO: Make this efficient jfc
            item.Selected = true;
        }
    }

    private void OnClearPressed(BaseButton.ButtonEventArgs obj)
    {
        foreach (var item in ChannelList)
        {
            // TODO: Make this efficient jfc
            item.Selected = false;
        }
    }

    /// <summary>
    /// Walks up the tree of instrument masters to find the truest master of them all.
    /// </summary>
    private ActiveInstrumentComponent ResolveActiveInstrument(InstrumentComponent? comp)
    {
        comp ??= _entityManager.GetComponent<InstrumentComponent>(_owner.Owner);

        var instrument = new Entity<InstrumentComponent>(_owner.Owner, comp);

        while (true)
        {
            if (instrument.Comp.Master == null)
                break;

            instrument = new Entity<InstrumentComponent>((EntityUid)instrument.Comp.Master,
                _entityManager.GetComponent<InstrumentComponent>((EntityUid)instrument.Comp.Master));
        }

        return _entityManager.GetComponent<ActiveInstrumentComponent>(instrument.Owner);
    }

    public void Populate()
    {
        ChannelList.Clear();
        var instrument = _entityManager.GetComponent<InstrumentComponent>(_owner.Owner);
        var activeInstrument = ResolveActiveInstrument(instrument);

        for (int i = 0; i < RobustMidiEvent.MaxChannels; i++)
        {
            var label = _owner.Loc.GetString("instrument-component-channel-name",
                ("number", i));
            if (activeInstrument != null
                && activeInstrument.Tracks.TryGetValue(i, out var resolvedMidiChannel)
                && resolvedMidiChannel != null)
            {
                if (DisplayTrackNames.Pressed)
                {
                    label = resolvedMidiChannel switch
                    {
                        { TrackName: not null, InstrumentName: not null } =>
                            Loc.GetString("instruments-component-channels-multi",
                                ("channel", i),
                                ("name", resolvedMidiChannel.TrackName),
                                ("other", resolvedMidiChannel.InstrumentName)),
                        { TrackName: not null } =>
                            Loc.GetString("instruments-component-channels-single",
                            ("channel", i),
                            ("name", resolvedMidiChannel.TrackName)),
                        _ => label,
                    };
                }
                else
                {
                    label = resolvedMidiChannel switch
                    {
                        { ProgramName: not null } =>
                            Loc.GetString("instruments-component-channels-single",
                                ("channel", i),
                                ("name", resolvedMidiChannel.ProgramName)),
                        _ => label,
                    };
                }
            }

            var item = ChannelList.AddItem(label, null, true, i);

            item.Selected = !instrument?.FilteredChannels[i] ?? false;
        }
    }
}