#include <Windows.h>
#include "resource.h"
#include <math.h>
#include <Windowsx.h>
#include <string>
#include <iostream>
#include <fstream>

using namespace std;

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int
	nCmdShow)
{
	HWND hMainWnd;
	MSG msg;

	//Создаём основное окно приложения
	hMainWnd = CreateDialog(hInstance, MAKEINTRESOURCE(IDD_DIALOG1), 0, (DLGPROC)WndProc);

	if (!hMainWnd) {
		MessageBox(NULL, "Cannot create main window", "Error", MB_OK);
		return 0;
	}

	//Показываем наше окно
	ShowWindow(hMainWnd, nCmdShow);
	UpdateWindow(hMainWnd); //См. примечание в разделе "Отображение окна..."

	//Выполняем цикл обработки сообщений до закрытия приложения
	while (GetMessage(&msg, NULL, 0, 0)) {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	HWND ComboBox = GetDlgItem(hWnd, IDC_COMBO1);
	switch (uMsg)
	{
	case WM_INITDIALOG: {
		ComboBox_AddString(ComboBox, "Sphere");
		ComboBox_AddString(ComboBox, "Cube");
		ComboBox_AddString(ComboBox, "Circle");
		ComboBox_AddString(ComboBox, "Square");

		Button_Enable(GetDlgItem(hWnd, ID_SAVE), 0);
		break;
	}

	case WM_CLOSE:
		DestroyWindow(hWnd);
		break;
	case WM_COMMAND: {
		if (LOWORD(wParam) == ID_SAVE) {
			char val[500];
			string figure;
			Edit_GetText(GetDlgItem(hWnd, IDC_EDIT2), val, sizeof(val));

			double value = atof(val), calc = 0;

			int boxValue = ComboBox_GetCurSel(ComboBox);

			if (boxValue == 0) {
				figure = "Sphere: ";
				calc = 4 * 3.14*pow(value, 2);
			}
			else if (boxValue == 1) {
				figure = "Cube: ";
				calc = pow(value, 3);
			}
			else if (boxValue == 2) {
				figure = "Circle: ";
				calc = 3.14 * pow(value, 2);
			}
			else if (boxValue == 3) {
				figure = "Square: ";
				calc = pow(value, 2);
			}

			figure = figure + to_string(calc);

			ofstream file("datalist.txt", ios_base::app);

			file << figure.c_str() << endl;
			file.close();

		} else {
			Button_Enable(GetDlgItem(hWnd, ID_SAVE), 0);
			//Check val's
			if (ComboBox_GetCurSel(ComboBox) < 0) break;
			if (Edit_GetTextLength(GetDlgItem(hWnd, IDC_EDIT2)) < 1) break;

			Button_Enable(GetDlgItem(hWnd, ID_SAVE), 1);
		}
		break;
	}
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	}

	return 0;
}