using System;
using System.IO;
using System.Runtime.InteropServices;
using FFXIVClientStructs.FFXIV.Client.Graphics.Kernel;
using LLib.ImGui;
using Microsoft.Extensions.Logging;

namespace LLib.Notifications;

public sealed class OutOfGameNotifier : IDisposable
{
	[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
	private struct NOTIFYICONDATA
	{
		public uint cbSize;

		public nint hWnd;

		public uint uID;

		public uint uFlags;

		public uint uCallbackMessage;

		public nint hIcon;

		[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
		public string szTip;

		public uint dwState;

		public uint dwStateMask;

		[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
		public string szInfo;

		public uint uTimeoutOrVersion;

		[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 64)]
		public string szInfoTitle;

		public uint dwInfoFlags;

		public Guid guidItem;

		public nint hBalloonIcon;
	}

	private static class NativeMethods
	{
		[DllImport("user32.dll")]
		[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
		public static extern nint GetForegroundWindow();

		[DllImport("user32.dll")]
		[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
		[return: MarshalAs(UnmanagedType.Bool)]
		public static extern bool MessageBeep(uint uType);

		[DllImport("winmm.dll", CharSet = CharSet.Unicode, EntryPoint = "PlaySoundW")]
		[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
		[return: MarshalAs(UnmanagedType.Bool)]
		public static extern bool PlaySound(string? pszSound, nint hmod, uint fdwSound);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
		public static extern nint SendMessage(nint hWnd, uint msg, nint wParam, nint lParam);

		[DllImport("user32.dll", EntryPoint = "GetClassLongPtrW")]
		[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
		public static extern nint GetClassLongPtr(nint hWnd, int nIndex);

		[DllImport("user32.dll", EntryPoint = "LoadIconW")]
		[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
		public static extern nint LoadIcon(nint hInstance, nint lpIconName);

		[DllImport("shell32.dll", CharSet = CharSet.Unicode)]
		[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
		[return: MarshalAs(UnmanagedType.Bool)]
		public static extern bool Shell_NotifyIcon(uint dwMessage, ref NOTIFYICONDATA lpData);
	}

	private const uint NIM_ADD = 0u;

	private const uint NIM_MODIFY = 1u;

	private const uint NIM_DELETE = 2u;

	private const uint NIM_SETVERSION = 4u;

	private const uint NIF_ICON = 2u;

	private const uint NIF_TIP = 4u;

	private const uint NIF_INFO = 16u;

	private const uint NIIF_INFO = 1u;

	private const uint NOTIFYICON_VERSION_4 = 4u;

	private const uint MB_ICONASTERISK = 64u;

	private const uint SND_ASYNC = 1u;

	private const uint SND_NODEFAULT = 2u;

	private const uint SND_FILENAME = 131072u;

	private const uint WM_GETICON = 127u;

	private const nint ICON_SMALL = 0;

	private const nint ICON_BIG = 1;

	private const int GCLP_HICON = -14;

	private const int GCLP_HICONSM = -34;

	private const nint IDI_APPLICATION = 32512;

	private const uint TrayIconId = 176u;

	private readonly ILogger<OutOfGameNotifier> _logger;

	private bool _trayIconRegistered;

	private nint _trayHWnd;

	private bool _disposed;

	private unsafe static nint GameWindowHandle
	{
		get
		{
			Device* ptr = Device.Instance();
			if (ptr == null)
			{
				return 0;
			}
			return (nint)ptr->hWnd;
		}
	}

	public bool IsGameForeground
	{
		get
		{
			nint gameWindowHandle = GameWindowHandle;
			if (gameWindowHandle != 0)
			{
				return NativeMethods.GetForegroundWindow() == gameWindowHandle;
			}
			return false;
		}
	}

	public OutOfGameNotifier(ILogger<OutOfGameNotifier> logger)
	{
		_logger = logger;
	}

	public void FlashTaskbar()
	{
		WindowFlash.Flash(GameWindowHandle, 0u);
	}

	public void PlayAlertSound(string? wavPath)
	{
		if (!string.IsNullOrEmpty(wavPath) && File.Exists(wavPath))
		{
			if (NativeMethods.PlaySound(wavPath, 0, 131075u))
			{
				return;
			}
			_logger.LogTrace("PlaySound failed for {Path}, falling back to beep", wavPath);
		}
		if (!NativeMethods.MessageBeep(64u))
		{
			_logger.LogTrace("MessageBeep returned false");
		}
	}

	public void ShowTrayNotification(string title, string message)
	{
		nint gameWindowHandle = GameWindowHandle;
		if (gameWindowHandle == 0)
		{
			_logger.LogWarning("Cannot show tray notification - game window handle not available");
			return;
		}
		try
		{
			if (!_trayIconRegistered)
			{
				nint num = GetGameIcon(gameWindowHandle);
				if (num == 0)
				{
					num = NativeMethods.LoadIcon(0, 32512);
				}
				NOTIFYICONDATA lpData = new NOTIFYICONDATA
				{
					cbSize = (uint)Marshal.SizeOf<NOTIFYICONDATA>(),
					hWnd = gameWindowHandle,
					uID = 176u,
					uFlags = 6u,
					hIcon = num,
					szTip = Truncate(title, 127)
				};
				if (!NativeMethods.Shell_NotifyIcon(0u, ref lpData))
				{
					_logger.LogWarning("Shell_NotifyIcon(NIM_ADD) failed");
					return;
				}
				NOTIFYICONDATA lpData2 = new NOTIFYICONDATA
				{
					cbSize = (uint)Marshal.SizeOf<NOTIFYICONDATA>(),
					hWnd = gameWindowHandle,
					uID = 176u,
					uTimeoutOrVersion = 4u
				};
				NativeMethods.Shell_NotifyIcon(4u, ref lpData2);
				_trayHWnd = gameWindowHandle;
				_trayIconRegistered = true;
			}
			NOTIFYICONDATA lpData3 = new NOTIFYICONDATA
			{
				cbSize = (uint)Marshal.SizeOf<NOTIFYICONDATA>(),
				hWnd = _trayHWnd,
				uID = 176u,
				uFlags = 16u,
				szInfoTitle = Truncate(title, 63),
				szInfo = Truncate(message, 255),
				dwInfoFlags = 1u
			};
			if (!NativeMethods.Shell_NotifyIcon(1u, ref lpData3))
			{
				_logger.LogWarning("Shell_NotifyIcon(NIM_MODIFY) failed");
			}
		}
		catch (Exception exception)
		{
			_logger.LogError(exception, "Failed to show tray notification");
		}
	}

	private static nint GetGameIcon(nint hWnd)
	{
		nint num = NativeMethods.SendMessage(hWnd, 127u, 1, 0);
		if (num == 0)
		{
			num = NativeMethods.SendMessage(hWnd, 127u, 0, 0);
		}
		if (num == 0)
		{
			num = NativeMethods.GetClassLongPtr(hWnd, -14);
		}
		if (num == 0)
		{
			num = NativeMethods.GetClassLongPtr(hWnd, -34);
		}
		return num;
	}

	private static string Truncate(string value, int maxChars)
	{
		if (value.Length > maxChars)
		{
			return value.Substring(0, maxChars);
		}
		return value;
	}

	public void Dispose()
	{
		if (!_disposed)
		{
			_disposed = true;
			if (_trayIconRegistered)
			{
				NOTIFYICONDATA lpData = new NOTIFYICONDATA
				{
					cbSize = (uint)Marshal.SizeOf<NOTIFYICONDATA>(),
					hWnd = _trayHWnd,
					uID = 176u
				};
				NativeMethods.Shell_NotifyIcon(2u, ref lpData);
				_trayIconRegistered = false;
			}
		}
	}
}