using System;
using System.Collections.Generic;
using RobocraftX.StateSync;
using Svelto.ECS;
using TechbloxModdingAPI.Utility;

namespace TechbloxModdingAPI.Common.Engines;

public class EngineManager
{
    private static Dictionary<ApiEngineType, List<IApiEngine>> _engines = new();

    /// <summary>
    /// Register an engine to a given game state and type. Or multiple.
    /// </summary>
    /// <param name="engine">The engine</param>
    /// <param name="types">The types to register to</param>
    public static void AddEngine(IApiEngine engine, params ApiEngineType[] types)
    {
        if (types.Length == 0)
            Logging.LogWarning($"Engine {engine.GetType().FullName} added without any types! This doesn't do anything.");
        foreach (var type in types)
        {
            if (!_engines.ContainsKey(type))
                _engines.Add(type, new List<IApiEngine>());
            _engines[type].Add(engine);
        }
    }

    public static void RegisterEngines(StateSyncRegistrationHelper helper, EnginesRoot enginesRoot, ApiEngineType type)
    {
        IEntityFactory factory = enginesRoot.GenerateEntityFactory();
        IEntityFunctions functions = enginesRoot.GenerateEntityFunctions();
        foreach (var engine in _engines[type])
        {
            string name = engine is INamedApiEngine namedEngine ? namedEngine.Name : engine.ToString();
            Logging.MetaDebugLog($"Registering {type} IApiEngine {name}");
            if (engine is IDeterministicEngine detEngine)
                if (helper is not null) helper.AddDeterministicEngine(detEngine);
                else throw new InvalidOperationException($"Attempting to add deterministic engine to non-deterministic state {type}");
            else
                enginesRoot.AddEngine(engine);
            switch (engine)
            {
                case IFactoryEngine factEngine:
                    factEngine.Factory = factory;
                    break;
                case IFunEngine funEngine:
                    funEngine.Functions = functions;
                    break;
            }
        }
    }
}