using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Security.Cryptography;
using System.Text;
using BepInEx.Configuration;
using HarmonyLib;
using undead_universal_patch_il2cpp.Core.Config;

namespace undead_universal_patch_il2cpp.Core
{
    public class PatchTypesResult
    {
        public string Description;
        public Type Type;
        public MethodInfo Method;
        public bool Success;
    }

    public class Util
    {
        private static readonly PatchTypesResult UnsuccessfulPatchResult = new()
        {
            Type = null,
            Method = null,
            Success = false
        };

        public static string LocalInstanceGuid { set; get; }

        public static void ConditionalDebug(string msg)
        {
            if (GenericConfig.PatchDebug.Value) UniversalPatchPlugin.Log.LogDebug(msg);
        }

        public static PatchTypesResult ConfigsPreparePatchTypes(ConfigEntry<bool>[] config, string description, string targetTypeName, string methodName)
        {
            if (config.All(conf => conf.Value)) return VerifyPatchTypes(description, targetTypeName, methodName);
            else return UnsuccessfulPatchResult;
        }

        public static PatchTypesResult ConfigPreparePatchTypes(ConfigEntry<bool> config, string description, string targetTypeName, string methodName)
        {
            if (config.Value) return VerifyPatchTypes(description, targetTypeName, methodName);
            else return UnsuccessfulPatchResult;
        }

        public static PatchTypesResult PreparePatchTypes(string description, string targetTypeName, string methodName)
        {
            return VerifyPatchTypes(description, targetTypeName, methodName);
        }

        public static PatchTypesResult PreparePatchSpecificTypes(string description, string targetTypeName, string methodName, string[] generics)
        {
            return VerifyPatchTypes(description, targetTypeName, methodName, [.. generics]);
        }

        private static PatchTypesResult VerifyPatchTypes(string description, string targetTypeName, string methodName, List<string> generics = null)
        {
            ConditionalDebug($"Loading patch '{description}'");

            Type targetType = AccessTools.TypeByName(targetTypeName);
            if (targetType == null)
            {
                UniversalPatchPlugin.Log.LogWarning($"Patch '{description}' disabled. The type for this patch was not found.");
                return UnsuccessfulPatchResult;
            }

            List<Type> types = null;
            if (generics != null)
            {
                types = generics.Select(AccessTools.TypeByName).ToList();
                if (!types.All(type => type != null))
                {
                    UniversalPatchPlugin.Log.LogWarning($"Patch '{description}' disabled. One or more generics for this patch were not found.");
                    return UnsuccessfulPatchResult;
                }
            }

            MethodInfo method;
            if (generics != null && types != null)
            {
                ConditionalDebug($"Fetching method type: Type '{targetType.Name}', Method '{methodName}', Generics: {types.Count}");
                method = AccessTools.Method(targetType, methodName, [.. types]);
            }
            else
            {
                ConditionalDebug($"Fetching method type: Type '{targetType.Name}', Method '{methodName}'");
                method = AccessTools.Method(targetType, methodName);
            }
            if (method == null)
            {
                UniversalPatchPlugin.Log.LogWarning($"Patch '{description}' disabled. The method for this patch was not found.");
                return UnsuccessfulPatchResult;
            }

            UniversalPatchPlugin.Log.LogInfo($"Patch '{description}' succeeded validation.");
            return new PatchTypesResult
            {
                Description = description,
                Type = targetType,
                Method = method,
                Success = true
            };
        }

        public static PatchTypesResult PostRequireTypes(PatchTypesResult result, object[] objects)
        {
            if (result.Success)
            {
                if (!objects.All(obj => obj != null))
                {
                    UniversalPatchPlugin.Log.LogError($"'{result.Description}' failed: A postrequire type was not found.");
                    return UnsuccessfulPatchResult;
                }
                else return result;
            }
            else return UnsuccessfulPatchResult;
        }

    }
}