using System.Diagnostics.CodeAnalysis;
using Content.Shared.Emag.Systems;
using Content.Shared.Materials;
using Content.Shared.Research.Prototypes;
using JetBrains.Annotations;
using Robust.Shared.Prototypes;
using Robust.Shared.Utility;

namespace Content.Shared.Lathe;

/// <summary>
/// This handles...
/// </summary>
public abstract class SharedLatheSystem : EntitySystem
{
    [Dependency] private readonly IPrototypeManager _proto = default!;
    [Dependency] private readonly SharedMaterialStorageSystem _materialStorage = default!;

    private readonly Dictionary<string, List<LatheRecipePrototype>> _inverseRecipeDictionary = new();

    public override void Initialize()
    {
        base.Initialize();

        SubscribeLocalEvent<EmagLatheRecipesComponent, GotEmaggedEvent>(OnEmagged);
        SubscribeLocalEvent<PrototypesReloadedEventArgs>(OnPrototypesReloaded);
        BuildInverseRecipeDictionary();
    }

    [PublicAPI]
    public bool CanProduce(EntityUid uid, string recipe, int amount = 1, LatheComponent? component = null)
    {
        return _proto.TryIndex<LatheRecipePrototype>(recipe, out var proto) && CanProduce(uid, proto, amount, component);
    }

    public bool CanProduce(EntityUid uid, LatheRecipePrototype recipe, int amount = 1, LatheComponent? component = null)
    {
        if (!Resolve(uid, ref component))
            return false;
        if (!HasRecipe(uid, recipe, component))
            return false;

        foreach (var (material, needed) in recipe.RequiredMaterials)
        {
            var adjustedAmount = AdjustMaterial(needed, recipe.ApplyMaterialDiscount, component.MaterialUseMultiplier);

            if (_materialStorage.GetMaterialAmount(uid, material) < adjustedAmount * amount)
                return false;
        }
        return true;
    }

    private void OnEmagged(EntityUid uid, EmagLatheRecipesComponent component, ref GotEmaggedEvent args)
    {
        args.Handled = true;
    }

    public static int AdjustMaterial(int original, bool reduce, float multiplier)
        => reduce ? (int) MathF.Ceiling(original * multiplier) : original;

    protected abstract bool HasRecipe(EntityUid uid, LatheRecipePrototype recipe, LatheComponent component);

    private void OnPrototypesReloaded(PrototypesReloadedEventArgs obj)
    {
        if (!obj.WasModified<LatheRecipePrototype>())
            return;
        BuildInverseRecipeDictionary();
    }

    private void BuildInverseRecipeDictionary()
    {
        _inverseRecipeDictionary.Clear();
        foreach (var latheRecipe in _proto.EnumeratePrototypes<LatheRecipePrototype>())
        {
            _inverseRecipeDictionary.GetOrNew(latheRecipe.Result).Add(latheRecipe);
        }
    }

    public bool TryGetRecipesFromEntity(string prototype, [NotNullWhen(true)] out List<LatheRecipePrototype>? recipes)
    {
        recipes = new();
        if (_inverseRecipeDictionary.TryGetValue(prototype, out var r))
            recipes.AddRange(r);
        return recipes.Count != 0;
    }
}