using Content.Shared.Chat.TypingIndicator;
using Robust.Client.GameObjects;
using Robust.Shared.Prototypes;
using Content.Shared.Inventory;

namespace Content.Client.Chat.TypingIndicator;

public sealed class TypingIndicatorVisualizerSystem : VisualizerSystem<TypingIndicatorComponent>
{
    [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
    [Dependency] private readonly InventorySystem _inventory = default!;
    [Dependency] private readonly SpriteSystem _sprite = default!;

    protected override void OnAppearanceChange(EntityUid uid, TypingIndicatorComponent component, ref AppearanceChangeEvent args)
    {
        if (args.Sprite == null)
            return;

        var currentTypingIndicator = component.TypingIndicatorPrototype;

        var evt = new BeforeShowTypingIndicatorEvent();

        if (TryComp<InventoryComponent>(uid, out var inventoryComp))
            _inventory.RelayEvent((uid, inventoryComp), ref evt);

        var overrideIndicator = evt.GetMostRecentIndicator();

        if (overrideIndicator != null)
            currentTypingIndicator = overrideIndicator.Value;

        if (!_prototypeManager.TryIndex(currentTypingIndicator, out var proto))
        {
            Log.Error($"Unknown typing indicator id: {component.TypingIndicatorPrototype}");
            return;
        }

        var layerExists = _sprite.LayerMapTryGet((uid, args.Sprite), TypingIndicatorLayers.Base, out var layer, false);
        if (!layerExists)
            layer = _sprite.LayerMapReserve((uid, args.Sprite), TypingIndicatorLayers.Base);

        _sprite.LayerSetRsi((uid, args.Sprite), layer, proto.SpritePath);
        _sprite.LayerSetRsiState((uid, args.Sprite), layer, proto.TypingState);
        args.Sprite.LayerSetShader(layer, proto.Shader);
        _sprite.LayerSetOffset((uid, args.Sprite), layer, proto.Offset);

        AppearanceSystem.TryGetData<TypingIndicatorState>(uid, TypingIndicatorVisuals.State, out var state);
        _sprite.LayerSetVisible((uid, args.Sprite), layer, state != TypingIndicatorState.None);
        switch (state)
        {
            case TypingIndicatorState.Idle:
                _sprite.LayerSetRsiState((uid, args.Sprite), layer, proto.IdleState);
                break;
            case TypingIndicatorState.Typing:
                _sprite.LayerSetRsiState((uid, args.Sprite), layer, proto.TypingState);
                break;
        }
    }
}