using System;
using System.Reflection;
using HarmonyLib;
using undead_universal_patch_il2cpp.Core;

namespace undead_universal_patch_il2cpp.Patches
{
    [HarmonyPatch]
    public class PhotonPatchEvent
    {
        static readonly string TargetTypeName = "PhotonNetwork";
        static readonly string TargetMethodName = "ConnectUsingSettings";
        static readonly string Description = "Photon ConnectUsingSettings patch event";
        static readonly Type targetType = AccessTools.TypeByName(TargetTypeName);

        static bool Prepare()
        {
            if (!PhotonConfig.PatchPhotonIds.Value) return false;
            if (targetType == null)
            {
                Plugin.Log.LogWarning($"'{Description}' disabled. The type for this patch was not found.");
                return false;
            }
            if (AccessTools.Method(targetType, TargetMethodName) == null)
            {
                Plugin.Log.LogWarning($"'{Description}' disabled. The method for this patch was not found.");
                return false;
            }

            Plugin.Log.LogInfo($"'{Description}' succeeded validation.");
            return true;
        }

        static MethodInfo TargetMethod() => AccessTools.Method(targetType, TargetMethodName);

        static void Prefix()
        {
            if (GenericConfig.PatchDebug.Value) Plugin.Log.LogDebug("Attempting Photon patch");
            PhotonPatch.Patch();
        }
    }

    [HarmonyPatch]
    public class ForceSelfHostedPhoton
    {
        class HarmonyState 
        {
            public object code;
        }

        static readonly string TargetTypeName = "PUNNetworkManager";
        static readonly string TargetMethodName = "OnConnectedToMaster";
        static readonly string Description = "Force JoinOrCreateRoom when connected to master";
        static readonly Type targetType = AccessTools.TypeByName(TargetTypeName);
        static readonly MethodInfo targetMethod = AccessTools.Method(targetType, TargetMethodName);

        static bool Prepare()
        {
            if (!(PhotonConfig.PatchPhotonIds.Value && PhotonConfig.SelfHosted.Value)) return false;
            if (targetType == null)
            {
                Plugin.Log.LogWarning($"'{Description}' disabled. The type for this patch was not found.");
                return false;
            }
            if (targetMethod == null)
            {
                Plugin.Log.LogWarning($"'{Description}' disabled. The method for this patch was not found.");
                return false;
            }

            Plugin.Log.LogInfo($"'{Description}' succeeded validation.");
            return true;
        }

        static MethodBase TargetMethod() => targetMethod;

        static void Prefix(ref PUNNetworkManager __instance, ref HarmonyState __state)
        {
            __state = new HarmonyState();
            PropertyInfo targetGameSessionProperty = __instance.GetType().GetRuntimeProperty("targetGameSession");
            if (targetGameSessionProperty == null)
            {
                Plugin.Log.LogFatal("Cannot force masterserver: targetGameSessionProperty was null.");
                return;
            }
            var targetGameSession = targetGameSessionProperty.GetValue(__instance);
            if (targetGameSession == null)
            {
                Plugin.Log.LogFatal("Cannot force masterserver: targetGameSession was null.");
                return;
            }
            PropertyInfo photonRegionIdProperty = targetGameSession.GetType().GetRuntimeProperty("PhotonRegionId");
            if (photonRegionIdProperty == null)
            {
                Plugin.Log.LogFatal("Cannot force masterserver: photonRegionIdProperty was null.");
                return;
            }

            __state.code = photonRegionIdProperty.GetValue(targetGameSession);
            photonRegionIdProperty.SetValue(targetGameSession, 4);
            if (GenericConfig.PatchDebug.Value) Plugin.Log.LogDebug("Forcing masterserver");
        }

        static void Postfix(ref PUNNetworkManager __instance, ref HarmonyState __state)
        {
            PropertyInfo targetGameSessionProperty = __instance.GetType().GetRuntimeProperty("targetGameSession");
            if (targetGameSessionProperty == null)
            {
                Plugin.Log.LogFatal("Cannot force masterserver postfix: targetGameSessionProperty was null.");
                return;
            }
            var targetGameSession = targetGameSessionProperty.GetValue(__instance);
            if (targetGameSession == null)
            {
                Plugin.Log.LogFatal("Cannot force masterserver postfix: targetGameSession was null.");
                return;
            }
            PropertyInfo photonRegionIdProperty = targetGameSession.GetType().GetRuntimeProperty("PhotonRegionId");
            if (photonRegionIdProperty == null)
            {
                Plugin.Log.LogFatal("Cannot force masterserver: photonRegionIdProperty was null.");
                return;
            }

            photonRegionIdProperty.SetValue(targetGameSession, __state.code);
            if (GenericConfig.PatchDebug.Value) Plugin.Log.LogDebug("Masterserver regionId roundtrip");
        }

    }

    public class PhotonPatch
    {
        public static void Patch()
        {
            // It's fine to reference enums after we're pretty sure the relevant types exist
            // i think
            Type photonNetworkType = AccessTools.TypeByName("PhotonNetwork");
            Type serverSettingsType = AccessTools.TypeByName("ServerSettings");

            if (photonNetworkType == null || serverSettingsType == null)
            {
                Plugin.Log.LogError("Cannot patch Photon: PhotonNetwork or ServerSettings types were not found. Is this build supported?");
                return;
            }

            PropertyInfo photonServerSettingsProperty = photonNetworkType.GetRuntimeProperty("PhotonServerSettings");
            object serverSettings = photonServerSettingsProperty.GetValue(serverSettingsType);

            if (PhotonConfig.PunLogging.Value)
            {
                PropertyInfo loggingProperty = serverSettingsType.GetRuntimeProperty("PunLogging");
                loggingProperty.SetValue(serverSettings, PhotonLogLevel.Full);
                PropertyInfo networkLoggingProperty = serverSettingsType.GetRuntimeProperty("NetworkLogging");
                networkLoggingProperty.SetValue(serverSettings, ExitGames.Client.Photon.DebugLevel.ALL);
            }

            PropertyInfo appIdProperty = serverSettingsType.GetRuntimeProperty("AppID");
            PropertyInfo voiceAppIdProperty = serverSettingsType.GetRuntimeProperty("VoiceAppID");

            if (GenericConfig.PatchDebug.Value) Plugin.Log.LogDebug($"New Photon AppID: '{PhotonConfig.AppID.Value}'");
            if (GenericConfig.PatchDebug.Value) Plugin.Log.LogDebug($"New Photon AppID: '{PhotonConfig.VoiceAppID.Value}'");
            appIdProperty.SetValue(serverSettings, PhotonConfig.AppID.Value);
            voiceAppIdProperty.SetValue(serverSettings, PhotonConfig.VoiceAppID.Value);

            if (PhotonConfig.SelfHosted.Value)
            {
                MethodInfo useMyServerMethod = serverSettingsType.GetMethod("UseMyServer");
                useMyServerMethod.Invoke(serverSettings, [
                    PhotonConfig.ServerAddress.Value,
                    PhotonConfig.ServerPort.Value,
                    PhotonConfig.AppID.Value,
                ]);
            }

            Type authValuesType = AccessTools.TypeByName("AuthenticationValues");
            if (authValuesType != null)
            {
                PropertyInfo networkingPeerProperty = photonNetworkType.GetRuntimeProperty("networkingPeer");
                if (networkingPeerProperty == null)
                {
                    Plugin.Log.LogError("Cannot patch Photon: networkingPeerProperty was null. Is this build supported?");
                    return;
                }

                if (networkingPeerProperty.GetValue(null) == null)
                {
                    Plugin.Log.LogError("Cannot patch Photon: networkingPeerInstance was null. Is this build supported?");
                    return;
                }

                string id = Util.LocalInstanceGuid;
                if (GenericConfig.PatchDebug.Value) Plugin.Log.LogDebug($"Instance GUID is {id}");

                PhotonNetwork.AuthValues = new AuthenticationValues
                {
                    UserId = id
                };

                if (GenericConfig.PatchDebug.Value) Plugin.Log.LogDebug($"Set the authValues userId to {id}");
            }

            Plugin.Log.LogInfo($"Photon patch ({(PhotonConfig.SelfHosted.Value ? "self-hosted" : "cloud")}) succeeded.");
        }
    }
}