using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.IO.Pipes;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;
using Dalamud.Plugin.Services;
using Lumina.Excel;
using Lumina.Excel.Sheets;
using Microsoft.Extensions.Logging;
using Questionable.LgbWorker;

namespace Questionable.Data;

internal sealed class LgbWorkerSupervisor
{
	private const string WorkerExeName = "Questionable.LgbWorker.exe";

	private const string WorkerSubDirectory = "lgb-worker";

	private const string ManifestFileName = "lgb-worker-manifest.json";

	private const string NpcCacheFileName = "npc-position-cache.bin";

	private const string BoundaryCacheFileName = "zone-boundary-cache.bin";

	private readonly IDataManager _dataManager;

	private readonly ILogger<LgbWorkerSupervisor> _logger;

	public LgbWorkerSupervisor(IDataManager dataManager, ILogger<LgbWorkerSupervisor> logger)
	{
		_dataManager = dataManager;
		_logger = logger;
	}

	public bool RunWorker(string sqpackPath, string gameVersion, string cacheDirectory, string pluginAssemblyDirectory, CancellationToken ct)
	{
		string text = Path.Combine(pluginAssemblyDirectory, "lgb-worker", "Questionable.LgbWorker.exe");
		if (!File.Exists(text))
		{
			_logger.LogWarning("LGB worker not found at {Path}, falling back to in-process scan", text);
			return false;
		}
		string npcCachePath = Path.Combine(cacheDirectory, "npc-position-cache.bin");
		string boundaryCachePath = Path.Combine(cacheDirectory, "zone-boundary-cache.bin");
		string text2 = Path.Combine(cacheDirectory, "lgb-worker-manifest.json");
		string text3 = $"Questionable.LgbWorker.{Guid.NewGuid():N}";
		Directory.CreateDirectory(cacheDirectory);
		_logger.LogDebug("Building LGB worker manifest from Excel sheets...");
		List<TerritoryEntry> list = BuildTerritoryList();
		List<LevelEntry> list2 = BuildLevelEntries();
		_logger.LogDebug("Manifest: {TerritoryCount} territories, {LevelCount} level entries", list.Count, list2.Count);
		LgbWorkerManifest value = new LgbWorkerManifest
		{
			SqpackPath = sqpackPath,
			GameVersion = gameVersion,
			NpcCachePath = npcCachePath,
			BoundaryCachePath = boundaryCachePath,
			Territories = list,
			LevelEntries = list2
		};
		File.WriteAllText(text2, JsonSerializer.Serialize(value));
		using NamedPipeServerStream namedPipeServerStream = new NamedPipeServerStream(text3, PipeDirection.In, 1, PipeTransmissionMode.Byte, PipeOptions.Asynchronous);
		int processId = Environment.ProcessId;
		ProcessStartInfo startInfo = new ProcessStartInfo
		{
			FileName = text,
			Arguments = $"--pipe {text3} --manifest \"{text2}\" --parent-pid {processId.ToString(CultureInfo.InvariantCulture)}",
			UseShellExecute = false,
			CreateNoWindow = true,
			RedirectStandardError = true
		};
		Process process = Process.Start(startInfo);
		try
		{
			if (process == null)
			{
				_logger.LogError("Failed to start LGB worker process");
				return false;
			}
			_logger.LogInformation("LGB worker started (PID {Pid})", process.Id);
			Task.Run(delegate
			{
				try
				{
					while (true)
					{
						string text4 = process.StandardError.ReadLine();
						if (text4 == null)
						{
							break;
						}
						_logger.LogDebug("[LgbWorker] {Line}", text4);
					}
				}
				catch
				{
				}
			}, ct);
			_logger.LogDebug("Waiting for LGB worker to connect...");
			try
			{
				namedPipeServerStream.WaitForConnection();
			}
			catch (IOException exception)
			{
				_logger.LogError(exception, "LGB worker pipe connection failed");
				process.Kill();
				return false;
			}
			_logger.LogDebug("LGB worker connected, reading messages...");
			try
			{
				while (true)
				{
					ct.ThrowIfCancellationRequested();
					LgbWorkerMessage lgbWorkerMessage = LgbWorkerFraming.Read(namedPipeServerStream);
					switch (lgbWorkerMessage.Type)
					{
					case LgbMessageType.Progress:
						if (lgbWorkerMessage.Total > 0 && lgbWorkerMessage.Done % (lgbWorkerMessage.Total / 10 + 1) == 0)
						{
							_logger.LogDebug("LGB worker progress: {Done}/{Total}", lgbWorkerMessage.Done, lgbWorkerMessage.Total);
						}
						break;
					case LgbMessageType.Final:
						if (lgbWorkerMessage.Success)
						{
							_logger.LogInformation("LGB worker completed in {Duration}ms", lgbWorkerMessage.DurationMs);
							process.WaitForExit(5000);
							CleanupManifest(text2);
							return true;
						}
						_logger.LogError("LGB worker reported failure: {Error}", lgbWorkerMessage.Error);
						process.WaitForExit(5000);
						CleanupManifest(text2);
						return false;
					}
				}
			}
			catch (EndOfStreamException)
			{
				process.WaitForExit(5000);
				_logger.LogError("LGB worker exited without a final message (exit code {Code})", process.ExitCode);
				CleanupManifest(text2);
				return false;
			}
			catch (OperationCanceledException)
			{
				process.Kill();
				CleanupManifest(text2);
				throw;
			}
		}
		finally
		{
			if (process != null)
			{
				((IDisposable)process).Dispose();
			}
		}
	}

	private List<TerritoryEntry> BuildTerritoryList()
	{
		HashSet<uint> hashSet = new HashSet<uint>();
		foreach (Aetheryte item in _dataManager.GetExcelSheet<Aetheryte>())
		{
			hashSet.Add(item.Territory.RowId);
		}
		List<TerritoryEntry> list = new List<TerritoryEntry>();
		List<TerritoryEntry> list2 = new List<TerritoryEntry>();
		foreach (TerritoryType item2 in _dataManager.GetExcelSheet<TerritoryType>())
		{
			if (item2.RowId == 0)
			{
				continue;
			}
			string text = item2.Bg.ExtractText();
			if (!string.IsNullOrEmpty(text) && text.Contains("/level/", StringComparison.Ordinal))
			{
				TerritoryEntry territoryEntry = new TerritoryEntry
				{
					RowId = item2.RowId,
					BgPath = text,
					IntendedUse = (byte)item2.TerritoryIntendedUse.RowId,
					HasAetheryte = hashSet.Contains(item2.RowId)
				};
				if (territoryEntry.HasAetheryte)
				{
					list.Add(territoryEntry);
				}
				else
				{
					list2.Add(territoryEntry);
				}
			}
		}
		list.AddRange(list2);
		return list;
	}

	private List<LevelEntry> BuildLevelEntries()
	{
		ExcelSheet<ENpcBase> excelSheet = _dataManager.GetExcelSheet<ENpcBase>();
		ExcelSheet<EObj> excelSheet2 = _dataManager.GetExcelSheet<EObj>();
		List<LevelEntry> list = new List<LevelEntry>();
		foreach (Level item in _dataManager.GetExcelSheet<Level>())
		{
			if (item.RowId != 0 && item.Object.RowId != 0 && item.Territory.IsValid && (excelSheet.HasRow(item.Object.RowId) || excelSheet2.HasRow(item.Object.RowId)))
			{
				list.Add(new LevelEntry
				{
					ObjectId = item.Object.RowId,
					TerritoryId = (ushort)item.Territory.RowId,
					X = item.X,
					Y = item.Y,
					Z = item.Z
				});
			}
		}
		return list;
	}

	private static void CleanupManifest(string path)
	{
		try
		{
			File.Delete(path);
		}
		catch
		{
		}
	}
}