using System;
using System.Collections.Generic;
using System.Reflection;
using HarmonyLib;

using RobocraftX;
using RobocraftX.Services;
using Svelto.Context;
using Svelto.Tasks;

using TechbloxModdingAPI.App;
using TechbloxModdingAPI.Blocks;
using TechbloxModdingAPI.Tasks;
using TechbloxModdingAPI.Utility;

namespace TechbloxModdingAPI
{
    /// <summary>
    /// The main class of the TechbloxModdingAPI.
    /// Use this to initialize the API before calling it.
    /// </summary>
    public static class Main
    {
        private static Harmony harmony;

        public static bool IsInitialized { 
            get { return harmony != null; }
        }

        private static int referenceCount = 0;

        /// <summary>
        /// Initializes the TechbloxModdingAPI. 
        /// Call this as soon as possible after Techblox starts up.
        /// Ideally, this should be called from your main Plugin class's OnApplicationStart() method.
        /// </summary>
        public static void Init()
        {
            referenceCount++;
            if (referenceCount > 1) { return; }
            if (IsInitialized)
            {
                Logging.LogWarning("TechbloxModdingAPI.Main.Init() called but API is already initialized!");
                return;
            }
            Logging.MetaDebugLog($"Patching Techblox");
            var currentAssembly = Assembly.GetExecutingAssembly();
            harmony = new Harmony(currentAssembly.GetName().Name);
            try
            {
                harmony.PatchAll(currentAssembly);
            }
            catch (Exception e)
            { //Can't use ErrorBuilder or Logging.LogException (which eventually uses ErrorBuilder) yet
                Logging.Log(e.ToString());
                Logging.LogWarning("Failed to patch Techblox. Attempting to patch to display error...");
                harmony.Patch(AccessTools.Method(typeof(FullGameCompositionRoot), "OnContextInitialized")
                        .MakeGenericMethod(typeof(UnityContext<FullGameCompositionRoot>)),
                    new HarmonyMethod(((Action) OnPatchError).Method)); //Can't use lambdas here :(
                return;
            }

            // init utility
            Logging.MetaDebugLog($"Initializing Utility");
            Utility.GameState.Init();
            // init block implementors
            Logging.MetaDebugLog($"Initializing Blocks");
			// init input
			Input.FakeInput.Init();
			// init object-oriented classes
			Player.Init();
            Block.Init();
            BlockGroup.Init();
            Wire.Init();
            Logging.MetaDebugLog($"Initializing Client");
			Client.Init();
			Game.Init();
            // init UI
            Interface.IMGUI.Constants.Init();
            Interface.IMGUI.IMGUIManager.Init();
            Logging.MetaDebugLog("Initializing anti-anticheat");
            var type = AccessTools.TypeByName("Techblox.Services.Eos.Anticheat.Client.Services.AnticheatClientService");
            harmony.Patch(type.GetConstructors()[0], new HarmonyMethod(((Func<bool>) AntiAntiCheat).Method));
            harmony.Patch(AccessTools.Method(type, "Shutdown"), new HarmonyMethod(((Func<bool>) AntiAntiCheat).Method));
            harmony.Patch(AccessTools.Method(type, "StartProtectedSession"), new HarmonyMethod(((AntiAnticheatDelegate) AntiAntiCheat).Method));
            harmony.Patch(AccessTools.Method(type, "StopProtectedSession"), new HarmonyMethod(((AntiAnticheatDelegateBool) AntiAntiCheat).Method));
            harmony.Patch(AccessTools.Method("Techblox.Services.Eos.Anticheat.Client.EosGetPendingMessagesToSendServiceRequest:Execute"), new HarmonyMethod(((AntiAnticheatDelegateTask)AntiAntiCheatTask).Method));
            Logging.MetaLog($"{currentAssembly.GetName().Name} v{currentAssembly.GetName().Version} initialized");
        }

        public delegate bool AntiAnticheatDelegate(ref object __result);
        public delegate bool AntiAnticheatDelegateBool(ref bool __result);
        public delegate bool AntiAnticheatDelegateTask(ref IEnumerator<TaskContract> __result);

        /// <summary>
        /// Shuts down & cleans up the TechbloxModdingAPI.
        /// Call this as late as possible before Techblox quits.
        /// Ideally, this should be called from your main Plugin class's OnApplicationQuit() method.
        /// </summary>
        public static void Shutdown()
        {
            if (referenceCount > 0) { referenceCount--; }
            if (referenceCount == 0)
            {
                if (!IsInitialized)
                {
                    Logging.LogWarning("TechbloxModdingAPI.Main.Shutdown() called but API is not initialized!");
                    return;
                }
                Scheduler.Dispose();
                var currentAssembly = Assembly.GetExecutingAssembly();
                harmony.UnpatchAll(currentAssembly.GetName().Name);
                harmony = null;
                Logging.MetaLog($"{currentAssembly.GetName().Name} v{currentAssembly.GetName().Version} shutdown");
            }
        }

        private static void OnPatchError()
        {
            ErrorBuilder.DisplayMustQuitError("Failed to patch Techblox!\n" +
                                              "Make sure you're using the latest version of TechbloxModdingAPI or disable mods if the API isn't released yet.");
        }

        private static bool AntiAntiCheat() => false;

        private static bool AntiAntiCheat(ref object __result)
        {
            var targetType =
                AccessTools.TypeByName("Techblox.Services.Eos.Anticheat.Client.Services.StartProtectedSessionResult");
            var target = Activator.CreateInstance(targetType);
            targetType.GetField("Success").SetValue(target, true);
            __result = target;
            return false;
        }

        private static bool AntiAntiCheat(ref bool __result)
        {
            __result = true;
            return false;
        }
        
        private static bool AntiAntiCheatTask(ref IEnumerator<TaskContract> __result)
        {
            IEnumerator<TaskContract> Func()
            {
                yield return Yield.It;
            }

            __result = Func();
            return false;
        }
    }
}