using PTMedicalInsurance.Common.WinAPI;
using PTMedicalInsurance.Variables;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace PTMedicalInsurance.Common.Hook
{
    class EventHookManger
    {
        private delegate void WinEventDelegate(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime);

        [DllImport("user32.dll")]
        private static extern IntPtr SetWinEventHook(uint eventMin, uint eventMax, IntPtr hmodWinEventProc, WinEventDelegate lpfnWinEventProc, uint idProcess, uint idThread, uint dwFlags);

        [DllImport("user32.dll")]
        private static extern bool UnhookWinEvent(IntPtr hWinEventHook);

        [DllImport("user32.dll", SetLastError = true)]
        private static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int count);

        private const uint EVENT_SYSTEM_FOREGROUND = 0x0003;
        private const uint WINEVENT_OUTOFCONTEXT = 0x0000;
        private const uint WINEVENT_SKIPOWNPROCESS = 0x0002;
        private const uint WINEVENT_SKIPOWNTHREAD = 0x0001;

        private IntPtr _winEventHookHandle;
        private string _targetWindowTitle;

        public EventHookManger(string targetWindowTitle)
        {
            _targetWindowTitle = targetWindowTitle;
        }

        public void StartMonitoring()
        {
            _winEventHookHandle = SetWinEventHook(EVENT_SYSTEM_FOREGROUND, EVENT_SYSTEM_FOREGROUND, IntPtr.Zero, new WinEventDelegate(WinEventProc), 0, 0, WINEVENT_OUTOFCONTEXT | WINEVENT_SKIPOWNPROCESS | WINEVENT_SKIPOWNTHREAD);

            if (_winEventHookHandle == IntPtr.Zero)
            {
                MessageBox.Show("Failed to install hook.");
                return;
            }
        }

        public void StopMonitoring()
        {
            if (_winEventHookHandle != IntPtr.Zero)
            {
                UnhookWinEvent(_winEventHookHandle);
                MessageBox.Show("Stopped monitoring.");
            }
        }

        private void WinEventProc(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
        {
            int threadId = WndHelper.GetWindowThreadProcessId(hwnd, out int processId);
            Global.writeLog($"hwnd:{hwnd},threadID:{threadId},processId:{processId}");
            StringBuilder windowTitle = new StringBuilder(256);
            GetWindowText(hwnd, windowTitle, windowTitle.Capacity);

            if (windowTitle.ToString() == _targetWindowTitle)
            {
                MessageBox.Show($"Window with title '{_targetWindowTitle}' was created or set to foreground.");
            }
        }
    }

}