using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.Versioning;
using BepInEx;
using BepInEx.Logging;
using Microsoft.CodeAnalysis;
using Mono.Cecil;

[assembly: CompilationRelaxations(8)]
[assembly: RuntimeCompatibility(WrapNonExceptionThrows = true)]
[assembly: Debuggable(DebuggableAttribute.DebuggingModes.Default | DebuggableAttribute.DebuggingModes.DisableOptimizations | DebuggableAttribute.DebuggingModes.IgnoreSymbolStoreSequencePoints | DebuggableAttribute.DebuggingModes.EnableEditAndContinue)]
[assembly: TargetFramework(".NETStandard,Version=v2.1", FrameworkDisplayName = ".NET Standard 2.1")]
[assembly: AssemblyCompany("LCOfficeV81Preloader")]
[assembly: AssemblyConfiguration("Debug")]
[assembly: AssemblyFileVersion("1.0.0.0")]
[assembly: AssemblyInformationalVersion("1.0.0")]
[assembly: AssemblyProduct("LCOfficeV81Preloader")]
[assembly: AssemblyTitle("LCOfficeV81Preloader")]
[assembly: AssemblyVersion("1.0.0.0")]
[module: RefSafetyRules(11)]
namespace Microsoft.CodeAnalysis
{
	[CompilerGenerated]
	[Embedded]
	internal sealed class EmbeddedAttribute : Attribute
	{
	}
}
namespace System.Runtime.CompilerServices
{
	[CompilerGenerated]
	[Embedded]
	[AttributeUsage(AttributeTargets.Module, AllowMultiple = false, Inherited = false)]
	internal sealed class RefSafetyRulesAttribute : Attribute
	{
		public readonly int Version;

		public RefSafetyRulesAttribute(int P_0)
		{
			Version = P_0;
		}
	}
}
namespace LCOfficeV81Preloader
{
	public static class Patcher
	{
		private static readonly ManualLogSource Log = Logger.CreateLogSource("LCOfficeV81Preloader");

		public static IEnumerable<string> TargetDLLs => Array.Empty<string>();

		public static void Initialize()
		{
			Log.LogInfo((object)"==========================================");
			Log.LogInfo((object)"[LCOfficeV81Preloader] Initialize reached.");
			Log.LogInfo((object)"[LCOfficeV81Preloader] Searching for original LCOffice.dll...");
			Log.LogInfo((object)"==========================================");
			try
			{
				string text = FindOriginalLCOfficeDll();
				if (text == null)
				{
					Log.LogWarning((object)"[LCOfficeV81Preloader] Could not find LCOffice.dll under BepInEx/plugins.");
					return;
				}
				Log.LogInfo((object)("[LCOfficeV81Preloader] Found LCOffice.dll: " + text));
				PatchLCOfficeAssembly(text);
			}
			catch (Exception ex)
			{
				Log.LogError((object)("[LCOfficeV81Preloader] Fatal patching error:\n" + ex));
			}
		}

		public static void Patch(AssemblyDefinition assembly)
		{
		}

		private static string FindOriginalLCOfficeDll()
		{
			if (!Directory.Exists(Paths.PluginPath))
			{
				return null;
			}
			string[] files = Directory.GetFiles(Paths.PluginPath, "LCOffice.dll", SearchOption.AllDirectories);
			if (files.Length == 0)
			{
				return null;
			}
			string text = files.FirstOrDefault((string path) => path.IndexOf("LCOfficeCompat", StringComparison.OrdinalIgnoreCase) < 0 && path.IndexOf("V81Compat", StringComparison.OrdinalIgnoreCase) < 0);
			return text ?? files[0];
		}

		private static void PatchLCOfficeAssembly(string assemblyPath)
		{
			//IL_0047: Unknown result type (might be due to invalid IL or missing references)
			//IL_004c: Unknown result type (might be due to invalid IL or missing references)
			//IL_0054: Unknown result type (might be due to invalid IL or missing references)
			//IL_005d: Expected O, but got Unknown
			//IL_00b7: Unknown result type (might be due to invalid IL or missing references)
			//IL_00be: Expected O, but got Unknown
			string text = assemblyPath + ".v81compat.backup";
			string text2 = assemblyPath + ".v81compat.tmp";
			if (!File.Exists(text))
			{
				File.Copy(assemblyPath, text, overwrite: false);
				Log.LogInfo((object)("[LCOfficeV81Preloader] Created backup: " + text));
			}
			ReaderParameters val = new ReaderParameters
			{
				ReadWrite = false,
				InMemory = true
			};
			AssemblyDefinition val2 = AssemblyDefinition.ReadAssembly(assemblyPath, val);
			try
			{
				ModuleDefinition mainModule = val2.MainModule;
				AssemblyNameReference val3 = ((IEnumerable<AssemblyNameReference>)mainModule.AssemblyReferences).FirstOrDefault((Func<AssemblyNameReference, bool>)((AssemblyNameReference reference) => string.Equals(reference.Name, "DunGen", StringComparison.OrdinalIgnoreCase)));
				if (val3 == null)
				{
					val3 = new AssemblyNameReference("DunGen", new Version(0, 0, 0, 0));
					mainModule.AssemblyReferences.Add(val3);
					Log.LogInfo((object)"[LCOfficeV81Preloader] Added DunGen assembly reference.");
				}
				int num = 0;
				foreach (TypeReference typeReference in mainModule.GetTypeReferences())
				{
					if (typeReference != null && !string.IsNullOrEmpty(typeReference.Namespace) && typeReference.Namespace.StartsWith("DunGen", StringComparison.Ordinal))
					{
						IMetadataScope scope = typeReference.Scope;
						AssemblyNameReference val4 = (AssemblyNameReference)(object)((scope is AssemblyNameReference) ? scope : null);
						if (val4 != null && string.Equals(val4.Name, "Assembly-CSharp", StringComparison.OrdinalIgnoreCase))
						{
							Log.LogInfo((object)("[LCOfficeV81Preloader] Redirecting type reference: " + ((MemberReference)typeReference).FullName + " | Assembly-CSharp -> DunGen"));
							typeReference.Scope = (IMetadataScope)(object)val3;
							num++;
						}
					}
				}
				if (num == 0)
				{
					Log.LogWarning((object)"[LCOfficeV81Preloader] No old DunGen type references were found.");
					Log.LogWarning((object)"[LCOfficeV81Preloader] DLL may already be patched.");
					return;
				}
				if (File.Exists(text2))
				{
					File.Delete(text2);
				}
				val2.Write(text2);
				File.Copy(text2, assemblyPath, overwrite: true);
				File.Delete(text2);
				Log.LogInfo((object)("[LCOfficeV81Preloader] Successfully redirected " + num + " DunGen type reference(s)."));
				Log.LogInfo((object)"[LCOfficeV81Preloader] Local LCOffice.dll patch complete.");
			}
			finally
			{
				((IDisposable)val2)?.Dispose();
			}
		}
	}
}