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#include <windows.h>

#include "resource.h"

HINSTANCE hInst;
HWND hWnd;

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow);
BOOL CALLBACK myWindow(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
void OnBrowse(HWND hParent,BOOL bOpen, int idc_name);
BOOL GetLine(HWND hWnd);

void OnBrowse(HWND hParent,BOOL bOpen,int idc_name){
	OPENFILENAME sOpenFile;
	char szPath[MAX_PATH + 1];
	BOOL bRet;
	HWND hCtrl;

	szPath[0] = '\0';
	
	ZeroMemory(&sOpenFile,sizeof(OPENFILENAME));
	sOpenFile.lStructSize = sizeof(OPENFILENAME);
	sOpenFile.hwndOwner = hParent;
	sOpenFile.lpstrFilter = "Fichiers Text (*.txt)\0*.txt\0\0";
	sOpenFile.nFilterIndex = 1;
	sOpenFile.lpstrFile = szPath;
	sOpenFile.nMaxFile = MAX_PATH + 1;
	sOpenFile.Flags = OFN_EXPLORER | OFN_PATHMUSTEXIST | 
		((bOpen)? OFN_FILEMUSTEXIST : OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT);

	if(bOpen)
	{
		hCtrl = GetDlgItem(hParent,idc_name);
		bRet = GetOpenFileName(&sOpenFile);
		SetWindowText(hCtrl,szPath);
	}
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
	return (int)DialogBox(hInstance,MAKEINTRESOURCE(IDD_DIALOG1),NULL,myWindow);
}

BOOL CALLBACK myWindow(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){

	switch(message) {

	case WM_INITDIALOG:
			return TRUE;

	case WM_COMMAND:
		switch(wParam) {
	
			case IDC_BUTTON1:
				OnBrowse(hWnd,TRUE, IDC_EDIT1);
				return TRUE;

			case IDC_BUTTON2:
				DestroyWindow(hWnd);
				return TRUE;

			case IDC_EXECUTE:
				GetLine(hWnd);
				return TRUE;

			default:
				return FALSE;
		}
	default:
		return FALSE;

	}

	return TRUE;

}

BOOL GetLine(HWND hWnd){

	int i,nLen,iLine;
	HWND hCtrl;
	DWORD hSrcFile,dw,dwFileSize;
	char* szData = NULL;
	char* szSrc = NULL;
	char* d;

	hCtrl = GetDlgItem(hWnd,IDC_EDIT1);
	nLen = GetWindowTextLength(hCtrl) + 1;

	szSrc = (char*)malloc(nLen);

	if (GetWindowText(hCtrl,szSrc,nLen) == 0){ 
		free(szSrc); 
		MessageBox(hWnd,"Veuillez choisir un fichier","Fichier",MB_OK);
		return FALSE;}
	
	hSrcFile = CreateFile(szSrc,GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);

	if(hSrcFile == INVALID_HANDLE_VALUE)
	{
		free(szSrc);
		return FALSE;
	}
	free(szSrc);

	dwFileSize = GetFileSize(hSrcFile,NULL)+1;
	szData = (char*)malloc(dwFileSize);

	if(!ReadFile(hSrcFile,szData,dwFileSize,&dw,NULL))
	{
		free(szData);
		CloseHandle(hSrcFile);
		return FALSE;
	}
	CloseHandle(hSrcFile);

	*(szData + dwFileSize) = '\0';

	d = szData;
	i = (*d ? 1 : 0);

	while(*d){
		switch(*d){
		case '\n':
			*d='\0';
			d++;
			i++;
			break;
		default:
			d++;
			break;
		}
	}
	d=NULL;

	hCtrl = GetDlgItem(hWnd,IDC_EDIT2);
	nLen = GetWindowTextLength(hCtrl) + 1;
	szSrc = (char*)malloc(nLen);
	GetWindowText(hCtrl,szSrc,nLen);
	iLine = atoi(szSrc)-1;
	free(szSrc);

	if (iLine<0){
		MessageBox(NULL, "Veuillez choisir un nombre positif!", "Erreur", MB_ICONERROR); 
		return FALSE;}
	if (iLine >= i)	{
		MessageBox(NULL, "Ce fichier n'a pas autant de lignes!", "Erreur", MB_ICONERROR); 
		return FALSE;}

    while(iLine--) szData += strlen(szData) + 1;
	MessageBox(hWnd, szData,"la ligne demandée est...",NULL);
	
	return TRUE;
}