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#include <windows.h>
#include <fstream>
#include "resource.h"

/*  Declare Windows procedure  */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

/*  Make the class name into a global variable  */
char szClassName[ ] = "pattern maker";

struct pattern
{
    int x;
    int y;
};

int WINAPI
WinMain (HINSTANCE hThisInstance,
         HINSTANCE hPrevInstance,
         LPSTR lpszArgument,
         int nFunsterStil)

{
    HWND hwnd;               /* This is the handle for our window */
    MSG messages;            /* Here messages to the application are saved */
    WNDCLASSEX wincl;        /* Data structure for the windowclass */

    /* The Window structure */
    wincl.hInstance = hThisInstance;
    wincl.lpszClassName = szClassName;
    wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
    wincl.style = CS_HREDRAW|CS_VREDRAW;                 /* Catch double-clicks */
    wincl.cbSize = sizeof (WNDCLASSEX);

    /* Use default icon and mouse-pointer */
    wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
    wincl.lpszMenuName=MAKEINTRESOURCE(UMENU);                /* No menu */
    wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
    wincl.cbWndExtra = 0;                      /* structure or the window instance */
    /* Use Windows''s default color as the background of the window */
    wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;

    /* Register the window class, and if it fails quit the program */
    if (!RegisterClassEx (&wincl))
        return 0;
    /* The class is registered, let''s create the program*/
    hwnd = CreateWindowEx (
           0,                   /* Extended possibilites for variation */
           szClassName,         /* Classname */
           "Windows App",       /* Title Text */
           WS_OVERLAPPEDWINDOW&~WS_THICKFRAME&~WS_MAXIMIZEBOX, /* default window */
           CW_USEDEFAULT,       /* Windows decides the position */
           CW_USEDEFAULT,       /* where the window ends up on the screen */
           30+32*4,                 /* The programs width */
           75+32*4,                 /* and height in pixels */
           NULL,        /* The window is a child-window to desktop */
           NULL,                /* No menu */
           hThisInstance,       /* Program Instance handler */
           NULL                 /* No Window Creation data */
           );

    /* Make the window visible on the screen */
    ShowWindow (hwnd, SW_SHOWNORMAL);

    /* Run the message loop. It will run until GetMessage() returns 0 */
    while (GetMessage (&messages, NULL, 0, 0))
    {
        /* Translate virtual-key messages into character messages */
        TranslateMessage(&messages);
        /* Send message to WindowProcedure */
        DispatchMessage(&messages);
    }

    /* The program return-value is 0 - The value that PostQuitMessage() gave */
    return messages.wParam;
}


/*  This function is called by the Windows function DispatchMessage()  */

LRESULT CALLBACK
WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    ofstream save;
    pattern p[4];
    static bool grid[4][4];
    static int num=0;
    static int pos=0;
    static HBRUSH brush=CreateSolidBrush(RGB(177,177,177));
    int x=0,y=0;
    int q=0;
    int i,j;
    int right,bottom;
    HDC hdc;
    char buffer[20];
    PAINTSTRUCT ps;
    switch (message)                  /* handle the messages */
    {
        case WM_DESTROY:
            DeleteObject(brush);
            PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
            return 0;
        case WM_RBUTTONDOWN:
            x=LOWORD(lParam);
            y=HIWORD(lParam);
            for(i=0;i<4;i++)
                for(j=0;j<4;j++)
                    if((x>i*32+10)&&(x<i*32+42)&&(y>j*32+10)&&(y<j*32+42))
                    {
                        if(num>0&&grid[i][j])
                            num--;
                        grid[i][j]=0;
                    }
            InvalidateRect(hwnd,NULL,1);
        return 0;
        case WM_LBUTTONDOWN:
            if(num==4)
                break;
            x=LOWORD(lParam);
            y=HIWORD(lParam);
            for(int i=0;i<4;i++)
                for(int j=0;j<4;j++)
                {
                    if((x>i*32+10)&&(x<i*32+42)&&(y>j*32+10)&&(y<j*32+42))
                    {
                        if(!grid[i][j])
                            num++;
                        grid[i][j]=1;
                    }
                }
            InvalidateRect(hwnd,NULL,1);
        return 0;
        case WM_PAINT:
            hdc=BeginPaint(hwnd,&ps);
            SelectObject(hdc,GetStockObject(BLACK_PEN));
            SelectObject(hdc,GetStockObject(WHITE_BRUSH));
            Rectangle(hdc,10,10,10+32*4+4,10+32*4+4);
            for(int i=0;i<4;i++)
            {
                MoveToEx(hdc,i*32+10+i,10,NULL);
                LineTo(hdc,i*32+10+i,10+32*4+4);
                MoveToEx(hdc,10,i*32+10+i,NULL);
                LineTo(hdc,10+32*4+4,i*32+10+i);
            }
            SelectObject(hdc,brush);
            for(int i=0;i<4;i++)
                for(int j=0;j<4;j++)
                {
                    if(grid[i][j])
                    {
                        bottom=j*32+44+j;
                        right=i*32+44+i;
                        if(i==3)
                            right--;
                        if(j==3)
                            bottom--;
                        Rectangle(hdc,i*32+10+i,j*32+10+j,right,bottom);
                    }
                }
            EndPaint(hwnd,&ps);
        return 0;

        case WM_COMMAND:
        MessageBox(hwnd,"you saved successfully",szClassName,MB_OK);
            switch(wParam)
            {
                case ID_FILE_SAVE:
                    if(num<4)
                    {
                        MessageBox(hwnd,"pattern has less than 4 blocks!","Error",MB_OK);
                        break;
                    }
                    save.open("../patterns.dat",ios::app|ios::binary);
                    if(!save)
                    {
                        MessageBox(hwnd,"could not open save file!","Error",MB_OK);
                        break;
                    }
                    for(int x=0;x<4;x++)
                        for(int y=0;y<4;y++)
                        {
                            if(grid[x][y])
                            {
                                p[q].x=x*25;
                                p[q].y=y*25;
                                q++;
                            }
                        }
                    save.write((char*)&p,sizeof(pattern)*4);
                    save.close();
                break;
                case ID_FILE_EXIT:
                    SendMessage(hwnd,WM_CLOSE,0,0);
                break;
            }

    }
            return DefWindowProc (hwnd, message, wParam, lParam);

    return 0;
}