using System;
using System.Collections;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;
using UnityEngine;
#if UNITY_EDITOR
using UnityEditor;
#endif

namespace RR.Game2D.Core.Managers
{
    /// <summary>
    /// Выполняет проверку лицензии при запуске приложения и пропускает ее в dev-среде.
    /// </summary>
    public class StartupLicenseManager : MonoBehaviour
    {
        private const string LauncherName = "RRLauncher.exe";
        private const float CheckTimeoutSeconds = 30f;
        private const float QuitDelaySeconds = 3f;
        private const uint WaitTimeout = 0x00000102;

        private bool _isInitialized;

        public void Initialize()
        {
            if (_isInitialized) return;

            _isInitialized = true;
            StartCoroutine(CheckLicenseCoroutine());
        }

        private IEnumerator CheckLicenseCoroutine()
        {
            // Ждем один кадр, чтобы Unity завершил базовую инициализацию.
            yield return null;

            if (ShouldSkipLicenseCheck())
            {
                ApplyLicensedStartupState();
                yield break;
            }

            bool licenseValid = false;
            bool checkCompleted = false;
            Exception licenseCheckException = null;

            Thread thread = new Thread(() =>
            {
                try
                {
                    licenseValid = CheckLicense();
                }
                catch (Exception ex)
                {
                    licenseCheckException = ex;
                }
                finally
                {
                    checkCompleted = true;
                }
            })
            {
                IsBackground = true
            };

            thread.Start();

            float timeLeft = CheckTimeoutSeconds;
            while (!checkCompleted && timeLeft > 0f)
            {
                timeLeft -= Time.deltaTime;
                yield return null;
            }

            if (!checkCompleted)
            {
                Debug.LogError("[License] License check timed out.");
                licenseValid = false;
            }

            if (licenseCheckException != null)
            {
                Debug.LogError($"[License] License check failed: {licenseCheckException.Message}");
                Debug.LogError($"[License] Stack trace: {licenseCheckException.StackTrace}");
                licenseValid = false;
            }

            if (!licenseValid)
            {
                yield return new WaitForSeconds(QuitDelaySeconds);
                QuitApplication();
                yield break;
            }

            ApplyLicensedStartupState();
        }

        private bool ShouldSkipLicenseCheck()
        {
            if (Application.isEditor)
            {
                Debug.Log("[License] Unity Editor detected. License check skipped.");
                return true;
            }

            if (Debug.isDebugBuild)
            {
                Debug.Log("[License] Development build detected. License check skipped.");
                return true;
            }

            return false;
        }

        private void ApplyLicensedStartupState()
        {
            Screen.fullScreenMode = FullScreenMode.ExclusiveFullScreen;
            Screen.SetResolution(1920, 1080, true);
            ClickCenter();
        }

        private void QuitApplication()
        {
#if UNITY_EDITOR
            EditorApplication.isPlaying = false;
#else
            Application.Quit();
#endif
        }

        private bool CheckLicense()
        {
            try
            {
                string launcherPath = FindLauncherPath();
                if (string.IsNullOrEmpty(launcherPath))
                {
                    Debug.LogError("[License] RRLauncher.exe not found.");
                    return false;
                }

                STARTUPINFO startupInfo = new STARTUPINFO
                {
                    cb = Marshal.SizeOf<STARTUPINFO>()
                };

                bool success = CreateProcess(
                    launcherPath,
                    null,
                    IntPtr.Zero,
                    IntPtr.Zero,
                    false,
                    0,
                    IntPtr.Zero,
                    Path.GetDirectoryName(launcherPath),
                    ref startupInfo,
                    out PROCESS_INFORMATION processInfo);

                if (!success) return false;

                try
                {
                    uint waitResult = WaitForSingleObject(processInfo.hProcess, (uint)(CheckTimeoutSeconds * 1000f));
                    if (waitResult == WaitTimeout) return false;

                    if (!GetExitCodeProcess(processInfo.hProcess, out uint exitCode)) return false;

                    if (exitCode == 0)
                    {
                        ForceToFront();
                        return true;
                    }

                    return false;
                }
                finally
                {
                    CloseHandle(processInfo.hProcess);
                    CloseHandle(processInfo.hThread);
                }
            }
            catch (Exception outerEx)
            {
                Debug.LogError($"[License] Critical error in CheckLicense: {outerEx.Message}");
                Debug.LogError($"[License] Stack trace: {outerEx.StackTrace}");
                return false;
            }
        }

        private static string FindLauncherPath()
        {
            string baseDirectory = AppDomain.CurrentDomain.BaseDirectory;
            string pathInBase = Path.Combine(baseDirectory, LauncherName);
            if (File.Exists(pathInBase)) return pathInBase;

            string pathInStreamingAssets = Path.Combine(Application.streamingAssetsPath, LauncherName);
            if (File.Exists(pathInStreamingAssets)) return pathInStreamingAssets;

            return null;
        }

        private void ForceToFront()
        {
            IntPtr handle = GetActiveWindow();
            SetForegroundWindow(handle);
        }

        private static void ClickCenter()
        {
            int screenWidth = Screen.currentResolution.width;
            int screenHeight = Screen.currentResolution.height;
            if (screenWidth <= 0 || screenHeight <= 0) return;

            int absoluteX = (int)(screenWidth * 0.5f * 65535 / screenWidth);
            int absoluteY = (int)(screenHeight * 0.5f * 65535 / screenHeight);

            INPUT[] inputs =
            {
                new INPUT
                {
                    type = InputMouse,
                    mi = new MOUSEINPUT
                    {
                        dx = absoluteX,
                        dy = absoluteY,
                        dwFlags = MouseEventfMove | MouseEventfAbsolute
                    }
                },
                new INPUT
                {
                    type = InputMouse,
                    mi = new MOUSEINPUT
                    {
                        dwFlags = MouseEventfLeftDown
                    }
                },
                new INPUT
                {
                    type = InputMouse,
                    mi = new MOUSEINPUT
                    {
                        dwFlags = MouseEventfLeftUp
                    }
                }
            };

            SendInput((uint)inputs.Length, inputs, Marshal.SizeOf<INPUT>());
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct PROCESS_INFORMATION
        {
            public IntPtr hProcess;
            public IntPtr hThread;
            public int dwProcessId;
            public int dwThreadId;
        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        private struct STARTUPINFO
        {
            public int cb;
            public string lpReserved;
            public string lpDesktop;
            public string lpTitle;
            public int dwX;
            public int dwY;
            public int dwXSize;
            public int dwYSize;
            public int dwXCountChars;
            public int dwYCountChars;
            public int dwFillAttribute;
            public int dwFlags;
            public short wShowWindow;
            public short cbReserved2;
            public IntPtr lpReserved2;
            public IntPtr hStdInput;
            public IntPtr hStdOutput;
            public IntPtr hStdError;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct INPUT
        {
            public uint type;
            public MOUSEINPUT mi;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct MOUSEINPUT
        {
            public int dx;
            public int dy;
            public uint mouseData;
            public uint dwFlags;
            public uint time;
            public IntPtr dwExtraInfo;
        }

        private const uint InputMouse = 0;
        private const uint MouseEventfMove = 0x0001;
        private const uint MouseEventfAbsolute = 0x8000;
        private const uint MouseEventfLeftDown = 0x0002;
        private const uint MouseEventfLeftUp = 0x0004;

        [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        private static extern bool CreateProcess(
            string lpApplicationName,
            string lpCommandLine,
            IntPtr lpProcessAttributes,
            IntPtr lpThreadAttributes,
            bool bInheritHandles,
            uint dwCreationFlags,
            IntPtr lpEnvironment,
            string lpCurrentDirectory,
            ref STARTUPINFO lpStartupInfo,
            out PROCESS_INFORMATION lpProcessInformation);

        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern uint WaitForSingleObject(IntPtr hHandle, uint dwMilliseconds);

        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern bool GetExitCodeProcess(IntPtr hProcess, out uint lpExitCode);

        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern bool CloseHandle(IntPtr hObject);

        [DllImport("user32.dll")]
        private static extern bool SetForegroundWindow(IntPtr hwnd);

        [DllImport("user32.dll")]
        private static extern IntPtr GetActiveWindow();

        [DllImport("user32.dll")]
        private static extern uint SendInput(uint nInputs, INPUT[] pInputs, int cbSize);
    }
}