using DunGen;
using HarmonyLib;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection.Emit;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Collections;
using DunGenPlus.Utils;
using DunGenPlus.Generation;
using DunGenPlus.Managers;
using DunGenPlus.Collections;
using DunGenPlus.DevTools;
using DunGen.Graph;
using UnityEngine;
using DunGenPlus.Components;

namespace DunGenPlus.Patches {
  internal class DungeonGeneratorPatch {

    [HarmonyPriority(Priority.First)]
    [HarmonyPatch(typeof(DungeonGenerator), "Generate")]
    [HarmonyPrefix]
    public static void GeneratePatch(ref DungeonGenerator __instance){
      DunGenPlusGenerator.Deactivate();

      var flow = __instance.DungeonFlow;
      var extender = API.GetDunGenExtender(flow);

      if (extender && extender.Active) {
        Plugin.logger.LogInfo($"Loading DunGenExtender for {flow.name}");
        DunGenPlusGenerator.Activate(__instance, extender);
        return;
      }

      Plugin.logger.LogInfo($"Did not load a DunGenExtenderer");
      DunGenPlusGenerator.Deactivate();
    }

    [HarmonyPostfix]
    [HarmonyPatch(typeof(DungeonGenerator), "InnerGenerate")]
    public static void InnerGeneratePatch(ref DungeonGenerator __instance, bool isRetry){
      if (API.IsDevDebugModeActive() && !isRetry) {
        DevDebugManager.Instance.RecordNewSeed(__instance.ChosenSeed);
      }

      if (DunGenPlusGenerator.Active && DunGenPlusGenerator.ActiveAlternative) {
        TileProxyPatch.ResetDictionary();
        DunGenPlusGenerator.SetCurrentMainPathExtender(0);
        MainRoomDoorwayGroups.ModifyGroupBasedOnBehaviourSimpleOnce = false;
      }
    }

    [HarmonyPostfix]
    [HarmonyPatch(typeof(DungeonGenerator), "GenerateMainPath")]
    public static void GenerateMainPathPatch(ref DungeonGenerator __instance){
      if (DunGenPlusGenerator.Active && DunGenPlusGenerator.ActiveAlternative) {
        DunGenPlusGenerator.RandomizeLineArchetypes(__instance, true);
      }
    }

    [HarmonyPostfix]
    [HarmonyPatch(typeof(DungeonGenerator), "GenerateBranchPaths")]
    public static void GenerateBranchPathsPatch(ref DungeonGenerator __instance, ref IEnumerator __result){
      if (DunGenPlusGenerator.Active && DunGenPlusGenerator.ActiveAlternative) {
        __result = DunGenPlusGenerator.GenerateAlternativeMainPaths(__instance); 
      }
    }

    [HarmonyTranspiler]
    [HarmonyPatch(typeof(DungeonGenerator), "GenerateMainPath", MethodType.Enumerator)]
    public static IEnumerable<CodeInstruction> GenerateMainPathPatch(IEnumerable<CodeInstruction> instructions){
      var setNodeFunction = typeof(TilePlacementParameters).GetMethod("set_Node", BindingFlags.Instance | BindingFlags.NonPublic);

      // tilePlacementParameters.Node = graphNode;
      var archSequence = new InstructionSequenceStandard("archetype node");
      archSequence.AddBasicLocal(OpCodes.Ldloc_S, 10);
      archSequence.AddBasicLocal(OpCodes.Ldloc_S, 8);
      archSequence.AddBasic(OpCodes.Callvirt, setNodeFunction);

      var attachToSequence = new InstructionSequenceStandard("attach to");
      attachToSequence.AddBasicLocal(OpCodes.Stloc_S, 14);

      foreach(var instruction in instructions){
        if (archSequence.VerifyStage(instruction)){
          //DunGenPlusGenerator.ModifyMainBranchNodeArchetype(tilePlacementParameters, graphNode, gen.RandomStream);
          var randomStreamMethod = typeof(DungeonGenerator).GetMethod("get_RandomStream", BindingFlags.Public | BindingFlags.Instance);
          var modifyMethod = typeof(DunGenPlusGenerator).GetMethod("ModifyMainBranchNodeArchetype", BindingFlags.Public | BindingFlags.Static);

          yield return instruction;

          yield return new CodeInstruction(OpCodes.Ldloc_S, 10);  // tilePlacementParameters
          yield return new CodeInstruction(OpCodes.Ldloc_S, 8);   // graphNode
          yield return new CodeInstruction(OpCodes.Ldloc_1);      // this
          yield return new CodeInstruction(OpCodes.Call, randomStreamMethod);
          yield return new CodeInstruction(OpCodes.Call, modifyMethod);
          
          continue;
        }

        if (attachToSequence.VerifyStage(instruction)){
          yield return instruction;

          var modifyMethod = typeof(MainRoomDoorwayGroups).GetMethod("ModifyGroupBasedOnBehaviourSimple", BindingFlags.Public | BindingFlags.Static);

          yield return new CodeInstruction(OpCodes.Ldloc_S, 14);
          yield return new CodeInstruction(OpCodes.Call, modifyMethod);

          continue;
        }

        yield return instruction;
      }

      archSequence.ReportComplete();
      attachToSequence.ReportComplete();
    }

    [HarmonyTranspiler]
    [HarmonyPatch(typeof(DungeonGenerator), "GenerateMainPath", MethodType.Enumerator)]
    public static IEnumerable<CodeInstruction> GenerateMainPathGetLineAtDepthPatch(IEnumerable<CodeInstruction> instructions){
      var getLineFunction = typeof(DungeonFlow).GetMethod("GetLineAtDepth", BindingFlags.Instance | BindingFlags.Public);
      var nodesField = typeof(DungeonFlow).GetField("Nodes", BindingFlags.Instance | BindingFlags.Public);

      var lineSequence = new InstructionSequenceStandard("GetLineAtDepth");
      lineSequence.AddBasic(OpCodes.Callvirt, getLineFunction);

      var nodesSequence = new InstructionSequenceStandard("Nodes", false);
      nodesSequence.AddBasic(OpCodes.Ldfld, nodesField);

      foreach(var instruction in instructions){
        if (lineSequence.VerifyStage(instruction)) {
          var specialFunction = typeof(DunGenPlusGenerator).GetMethod("GetLineAtDepth", BindingFlags.Static | BindingFlags.Public);

          yield return new CodeInstruction(OpCodes.Call, specialFunction);

          continue;
        }

        if (nodesSequence.VerifyStage(instruction)) {
          var specialFunction = typeof(DunGenPlusGenerator).GetMethod("GetNodes", BindingFlags.Static | BindingFlags.Public); 

          yield return new CodeInstruction(OpCodes.Call, specialFunction);

          continue;
        }
        yield return instruction;
      }

      lineSequence.ReportComplete();
      nodesSequence.ReportComplete();
    }


    [HarmonyTranspiler]
    [HarmonyPatch(typeof(DungeonGenerator), "InnerGenerate", MethodType.Enumerator)]
    public static IEnumerable<CodeInstruction> InnerGenerateLengthPatch(IEnumerable<CodeInstruction> instructions){

      var lengthField = typeof(DungeonFlow).GetField("Length", BindingFlags.Instance | BindingFlags.Public);
      var getIsEditor = typeof(Application).GetMethod("get_isEditor", BindingFlags.Static | BindingFlags.Public);

      var lengthSequence = new InstructionSequenceStandard("Length");
      lengthSequence.AddBasic(OpCodes.Ldfld, lengthField);

      var editorCheck = new InstructionSequenceStandard("Editor");
      editorCheck.AddBasic(OpCodes.Call, getIsEditor);

      foreach(var instruction in instructions){
        if (lengthSequence.VerifyStage(instruction)) {
          var specialFunction = typeof(DunGenPlusGenerator).GetMethod("GetLength", BindingFlags.Static | BindingFlags.Public);

          yield return new CodeInstruction(OpCodes.Call, specialFunction);

          continue;
        }

        if (editorCheck.VerifyStage(instruction)){
          var specialFunction = typeof(DunGenPlusGenerator).GetMethod("AllowRetryStop", BindingFlags.Static | BindingFlags.Public);
          
          yield return instruction;
          yield return new CodeInstruction(OpCodes.Call, specialFunction);

          continue;
        }

        yield return instruction;
      }

      lengthSequence.ReportComplete();
      editorCheck.ReportComplete();
    }

    [HarmonyPostfix]
    [HarmonyPatch(typeof(DungeonGenerator), "PostProcess")]
    public static void GenerateBranchPathsPatch(ref DungeonGenerator __instance){
      if (DunGenPlusGenerator.Active) {
        var value = __instance.RandomStream.Next(999);
        Components.Props.SpawnSyncedObjectCycle.UpdateCycle(value);
      }
    }

    [HarmonyTranspiler]
    [HarmonyPatch(typeof(DungeonGenerator), "AddTile")]
    public static IEnumerable<CodeInstruction> AddTileDebugPatch(IEnumerable<CodeInstruction> instructions){
      var addTileSequence = new InstructionSequenceStandard("Add Tile Placement");
      addTileSequence.AddBasic(OpCodes.Callvirt);
      addTileSequence.AddBasic(OpCodes.Ldc_I4_0);
      addTileSequence.AddBasic(OpCodes.Bgt);
      addTileSequence.AddBasicLocal(OpCodes.Ldloc_S, 8);

      foreach(var instruction in instructions){
        if (addTileSequence.VerifyStage(instruction)) {
          //DunGenPlusGenerator.RecordLastTilePlacementResult
          var specialFunction = typeof(DunGenPlusGenerator).GetMethod("RecordLastTilePlacementResult", BindingFlags.Static | BindingFlags.Public);

          yield return new CodeInstruction(OpCodes.Ldarg_0);          // generator
          yield return new CodeInstruction(OpCodes.Ldloc_S, 8);       // TilePlacementResult
          yield return new CodeInstruction(OpCodes.Ldarg_1);          // attachTo
          yield return new CodeInstruction(OpCodes.Call, specialFunction);

          yield return instruction;

          continue;
        }
        yield return instruction;
      }

      addTileSequence.ReportComplete();
    }
    
    [HarmonyPrefix]
    [HarmonyPatch(typeof(DungeonGenerator), "ProcessGlobalProps")]
    public static bool ProcessGlobalPropsPatch(ref DungeonGenerator __instance){
      if (DunGenPlusGenerator.Active){
        var anyGlobalSettings = DunGenPlusGenerator.Properties.MainPathProperties.DetailedGlobalPropSettings.Count > 0;
        var anyLocalSettings = DunGenPlusGenerator.Properties.MainPathProperties.MainPathDetails.Any(d => d.LocalGroupProps.Count > 0);
        if (anyGlobalSettings || anyLocalSettings){
          Plugin.logger.LogDebug("Performing Local Global Props algorithm");
          DunGenPlusGenerator.ProcessGlobalPropsPerMainPath(__instance);
          return false;
        }  
      }
      return true;
    }
    

    [HarmonyTranspiler]
    [HarmonyPatch(typeof(DungeonGenerator), "GenerateMainPath", MethodType.Enumerator)]
    public static IEnumerable<CodeInstruction> GenerateMainPathDebugPatch(IEnumerable<CodeInstruction> instructions){
      var tileProxyNullSequence = new InstructionSequenceStandard("TileProxyNull");
      tileProxyNullSequence.AddBasic(OpCodes.Br);
      tileProxyNullSequence.AddBasicLocal(OpCodes.Ldloc_S, 15);
      tileProxyNullSequence.AddBasic(OpCodes.Brtrue);

      FieldInfo indexField = null;

      foreach(var instruction in instructions){
        if (instruction.operand is FieldInfo field && field.Name.StartsWith("<j>"))
          indexField = field;

        if (tileProxyNullSequence.VerifyStage(instruction)) {

          yield return instruction;

          if (indexField != null) {
            //DunGenPlusGenerator.PrintAddTileErrorQuick
            var specialFunction = typeof(DunGenPlusGenerator).GetMethod("PrintAddTileErrorQuick", BindingFlags.Static | BindingFlags.Public);
            
            yield return new CodeInstruction(OpCodes.Ldloc_1);  // generator
            yield return new CodeInstruction(OpCodes.Ldarg_0);  // gets coroutine data
            yield return new CodeInstruction(OpCodes.Ldfld, indexField);  // gets index variable

            yield return new CodeInstruction(OpCodes.Call, specialFunction);
          }
          else {
            Plugin.logger.LogWarning("Failed to find current tile index field in the main path enumerator");
          }

          continue;
        }

        yield return instruction;
      }

      tileProxyNullSequence.ReportComplete();
    }


    public static TileProxy lastAttachTo;
    public static IEnumerable<TileSet> lastUseableTileSets;
    public static float lastNormalizedDepth;
    public static TilePlacementParameters lastPlacementParms;

    [HarmonyPrefix]
    [HarmonyPatch(typeof(DungeonGenerator), "AddTile")]
    public static void AddTileDebugPatch(TileProxy attachTo, IEnumerable<TileSet> useableTileSets, float normalizedDepth, TilePlacementParameters placementParams){
      lastAttachTo = attachTo;
      lastUseableTileSets = useableTileSets;
      lastNormalizedDepth = normalizedDepth;
      lastPlacementParms = placementParams;
    }

  }
}