using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Threading;

using Saraff.Twain;
using HXX.Scanner.Common;

namespace HXX.Scanner.Biz
{
    /// <summary>
    /// 调用windows系统api，关闭驱动弹框
    /// </summary>
    public class biz_engine_side
    {
        private static Form main_window;

        const int WM_CLOSE = 0x10;
        const int WM_GETTEXT = 0x000D;
        const int WM_GETTEXTLENGTH = 0x000E;

        private const int WM_ACTIVATE = 0x006;
        private const int WM_ACTIVATEAPP = 0x01C;
        private const int WM_NCACTIVATE = 0x086;
        private const int WA_INACTIVE = 0;
        private const int WM_MOUSEACTIVATE = 0x21;
        private const int MA_NOACTIVATE = 3;
        private const int WA_ACTIVE = 1;

        private const int SW_HIDE = 0;
        private const int SW_NORMAL = 1;
        private const int SW_SHOWNORMAL = 1;
        private const int SW_MAXIMIZE = 3;
        private const int SW_SHOWNOACTIVATE = 4;
        private const int SW_SHOW = 5;
        private const int SW_MINIMIZE = 6;
        private const int SW_RESTORE = 9;
        private const int SW_SHOWDEFAULT = 10;

        // 查找窗口
        [DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
        // 遍历窗口的所有子窗口，通过CallBack回调
        [DllImport("user32.dll")]
        public static extern int EnumChildWindows(IntPtr hWndParent, CallBack lpfn, int lParam);
        public delegate bool CallBack(IntPtr hwnd, int lParam);
        // 获取窗口的类名
        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        static extern int GetClassName(IntPtr hWnd, StringBuilder lpClassName, int nMaxCount);
        // 判断窗口是否可见
        [DllImport("user32.dll")]
        public static extern bool IsWindowVisible(IntPtr hWnd);
        // 获取窗口文本长度
        [DllImport("user32.dll")]
        public static extern int GetWindowTextLength(IntPtr hWnd);
        // 获取窗口文本，文本会塞入StringBuilder中，需要指明字符串最大长度nMaxCount
        [DllImport("User32.dll", EntryPoint = "GetWindowText")]
        private static extern int GetWindowText(IntPtr hwnd, StringBuilder lpString, int nMaxCount);
        // 给窗口发送消息
        [DllImport("user32.dll", EntryPoint = "SendMessageA")]
        public static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
        // 给窗口发送消息，事件返回的数据通过Byte[]数组获得
        [DllImport("user32.dll", EntryPoint = "SendMessageA")]
        public static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, Byte[] lParam);
        [DllImport("user32.dll", EntryPoint = "GetDlgItemTextA")]
        private static extern int GetDlgItemText(IntPtr hDlg, int nIDDlgItem, [Out] StringBuilder lpString, int nMaxCount);

        delegate bool deleWindowsProc(IntPtr hWnd, string lParam);

        [DllImport("user32.dll")]
        static extern int EnumWindows(deleWindowsProc hWnd, string lParam);
        [DllImport("user32.dll")]
        public static extern IntPtr SetActiveWindow(IntPtr handle);
        [DllImport("user32.dll")]
        public static extern int ShowWindow(IntPtr hwnd, int nCmdShow);
        [DllImport("user32.dll")]
        private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndlnsertAfter, int X, int Y, int cx, int cy, uint Flags);

        /// <summary>
        /// 置顶弹框扫描，废弃
        /// </summary>
        /// <param name="hWnd"></param>
        /// <param name="lParam"></param>
        /// <returns></returns>
        private static bool PrintWindow(IntPtr hWnd, string lParam)
        {
            var sb = new StringBuilder(50);
            GetWindowText(hWnd, sb, sb.Capacity);

            var title = sb.ToString().ToUpper();

            //if (sb.ToString() != String.Empty && sb.ToString().Contains(lParam))
            if (!string.IsNullOrEmpty(title) && (
                title.Contains("KV-") ||
                title.Contains("CANON") ||
                title.Contains("KODAK")
                ))
            {
                //ShowWindow(hWnd, SW_SHOW);
                //SendMessage(hWnd, WM_ACTIVATE, WA_ACTIVE, 0);
                //SendMessage(hWnd, WM_NCACTIVATE, WA_ACTIVE, 0);
                //ShowWindow(hWnd, SW_SHOWNORMAL);
                //SendMessage(hWnd, WM_NCACTIVATE, 1, 0);
                //SetWindowPos(hWnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE or SWP_NOSIZE);
                //SendMessage(hWnd, WM_ACTIVATE, WA_ACTIVE, 0);

                //main_window.WindowState = FormWindowState.Normal;
                main_window.TopMost = true;
                main_window.TopMost = false;

                //main_window.WindowState = FormWindowState.Minimized;
                main_window.Activate();

                if (title.Contains("KODAK"))
                {
                    ShowWindow(hWnd, SW_MINIMIZE);
                    ShowWindow(hWnd, SW_SHOWNORMAL);
                }

                SendMessage(hWnd, WM_ACTIVATE, WA_ACTIVE, 0);
                SetWindowPos(hWnd, main_window.Handle, 0, 0, 0, 0, 3);
               
                //SetActiveWindow(hWnd);

                return false;
            }

            return true;
        }

        /// <summary>
        /// 置顶弹框扫描，废弃
        /// </summary>
        /// <param name="_main"></param>
        public static void active_3rd_form(Form _main)
        {
            main_window = _main;

            var r = EnumWindows(PrintWindow, "KV-");
            //var r = EnumWindows(PrintWindow, "微信图片");
        }

        /// <summary>
        /// 关闭驱动弹框
        /// </summary>
        public static void check()
        {
            check_cannon();
            check_panasonic();
        }

        /// <summary>
        /// 关闭驱动弹框
        /// </summary>
        public static void check_all()
        {
            check_cannon_all();
            check_panasonic();
        }

        /// <summary>
        /// 佳能除卡纸外，弹框全杀
        /// </summary>
        private static void check_cannon()
        {
            IntPtr msgHandle = FindWindow(null, "扫描仪错误");

            if (msgHandle != IntPtr.Zero)
            {
                var text = check_cannon_text(msgHandle);

                if (!text.Contains("卡纸"))
                {
                    SendMessage(msgHandle, WM_CLOSE, 0, 0);
                }
            }
        }

        /// <summary>
        /// 检查佳能弹框文本
        /// </summary>
        /// <param name="mainHandle"></param>
        /// <returns></returns>
        private static string check_cannon_text(IntPtr mainHandle)
        {
            string result = "";

            if (mainHandle != IntPtr.Zero)
            {
                int i = EnumChildWindows(mainHandle, (h, l) =>
                {
                    StringBuilder sb = new StringBuilder();
                    GetClassName(h, sb, 255);
                    string classname = sb.ToString();

                    if ("Static" == classname)
                    {
                        // 是否可见
                        if (IsWindowVisible(h))
                        {
                            // 取出窗口文本
                            int textLen;
                            textLen = SendMessage(h, WM_GETTEXTLENGTH, 0, 0);
                            Byte[] byt = new Byte[textLen];
                            SendMessage(h, WM_GETTEXT, textLen + 1, byt);

                            result = Encoding.Default.GetString(byt);
                        }
                    }

                    return true;
                }, 0);
            }

            return result;
        }

        /// <summary>
        /// 松下弹框全杀
        /// </summary>
        private static void check_panasonic()
        {
            IntPtr msgHandle = FindWindow(null, "Source信息");

            if (msgHandle != IntPtr.Zero)
            {
                SendMessage(msgHandle, WM_CLOSE, 0, 0);
            }
        }

        /// <summary>
        /// 佳能弹框全杀
        /// </summary>
        private static void check_cannon_all()
        {
            IntPtr msgHandle = FindWindow(null, "扫描仪错误");

            if (msgHandle != IntPtr.Zero)
            {
                SendMessage(msgHandle, WM_CLOSE, 0, 0);
            }
        }        
    }
}