using System;
using System.Threading;
using Dalamud.Plugin;
using Dalamud.Plugin.Services;
using LLib.Shop;
using Microsoft.Extensions.Logging;
using SmartNav;
using SmartNav.Data;

namespace Questionable.Data;

internal sealed class NpcPositionCacheWarmer : IDisposable
{
	private readonly CancellationTokenSource _cts = new CancellationTokenSource();

	private readonly Thread? _thread;

	public NpcPositionCacheWarmer(NpcPositionCache npcPositionCache, WarpDataService warpDataService, NavRouter navRouter, LgbWorkerSupervisor workerSupervisor, IDalamudPluginInterface pluginInterface, IDataManager dataManager, NpcPositionCacheOptions cacheOptions, ILogger<NpcPositionCacheWarmer> logger)
	{
		NpcPositionCacheWarmer npcPositionCacheWarmer = this;
		if (npcPositionCache.IsBuilt)
		{
			return;
		}
		_thread = new Thread((ThreadStart)delegate
		{
			try
			{
				bool flag = false;
				string fullName = dataManager.GameData.DataPath.FullName;
				string gameVersion = cacheOptions.GameVersion;
				string cacheDirectory = cacheOptions.CacheDirectory;
				string directoryName = pluginInterface.AssemblyLocation.DirectoryName;
				if (fullName != null && gameVersion != null && cacheDirectory != null && directoryName != null)
				{
					flag = workerSupervisor.RunWorker(fullName, gameVersion, cacheDirectory, directoryName, npcPositionCacheWarmer._cts.Token);
					if (flag)
					{
						npcPositionCache.TryLoadFromDisk();
					}
				}
				if (!flag)
				{
					logger.LogInformation("Falling back to in-process LGB scan");
					npcPositionCache.WarmUp(npcPositionCacheWarmer._cts.Token);
				}
				if (warpDataService.ApplyDerivedSources())
				{
					navRouter.InvalidateStaticGraph();
					logger.LogInformation("Applied derived warp sources after NPC position warm-up");
				}
			}
			catch (OperationCanceledException)
			{
			}
			catch (Exception exception)
			{
				logger.LogError(exception, "NPC position cache warm-up failed");
			}
		})
		{
			IsBackground = true,
			Priority = ThreadPriority.BelowNormal,
			Name = "Questionable.NpcPositionCacheWarmer"
		};
		_thread.Start();
	}

	public void Dispose()
	{
		_cts.Cancel();
		_thread?.Join(TimeSpan.FromSeconds(1L));
		_cts.Dispose();
	}
}