#include <os.h>
#include <nGUI.h>
#include <nGEO.h>
#include <nMATHS.h>

int randnum(int s); //making my own temporary random function

int main()
{
    int x, y, xvel=-256, yvel=0, l, r, players=0, seed=0, die=0, lmov=0, rmov=0, lscore=0, rscore=0, ran;
    Color green = RGB(0, 255, 0);
    Color black = RGB(0, 0, 0);
    l = SCREEN_HEIGHT / 2 - 15;
    r = l;
    x = SCREEN_WIDTH * 128;
    y = SCREEN_HEIGHT * 128;
    clearScreen(black);
    drawStr(1, 0,
                                    "\n                  PONG\n\n"
                                    "Created by Epic7\n"
                                    "Using nRGBlib\n\n"
                                    "Multiplayer Controls:\n"
                                    "   - Player 1 up   : 9\n"
                                    "   - Player 1 down : 3\n"
                                    "   - Player 2 up   : 7\n"
                                    "   - Player 2 down : 1\n"
                                    "Singleplayer Controls:\n"
                                    "   - Player 1 Up   : 8\n"
                                    "   - Player 1 Down : 2\n\n"
                                    "Push Ctrl to Start Multiplayer\n"
                                    "Push Tab to Start Singleplayer", 1, 1, green);
    while (players  == 0)
    {
    seed++;
    if (isKeyPressed(KEY_NSPIRE_CTRL))
   {
       players = 2;
       }
       else if (isKeyPressed(KEY_NSPIRE_TAB))
       {
            players = 1;
            }
}
    while (lscore<10&&rscore<10&&!isKeyPressed(KEY_NSPIRE_ESC))
    {
    clearScreen(black);
    l = SCREEN_HEIGHT / 2 - 15;
    r = l;
    x = SCREEN_WIDTH * 128;
    y = SCREEN_HEIGHT * 128;
    die=0;
    yvel=0;
    xvel=-256;
    seed=randnum(seed); //my goal is to give yvel a random value -128 to 128
    yvel=seed%257-128;
    while (!isKeyPressed(KEY_NSPIRE_ESC)&&die==0)
    {
    lmov=0;
    rmov=0;
if (players == 2)
{
    if (isKeyPressed(KEY_NSPIRE_9)&&r>1)
    {
                                   drawBox_(SCREEN_WIDTH - 15, r, 5, 30, black);
                                   r--;
                                   rmov=-64;
                                   }
    else if (isKeyPressed(KEY_NSPIRE_3)&&r<SCREEN_HEIGHT-30)
    {
         drawBox_(SCREEN_WIDTH - 15, r, 5, 30, black);
         r++;
         rmov=64;
         }
        if (isKeyPressed(KEY_NSPIRE_7)&&l>1)
    {
                                       drawBox_(10, l, 5, 30, black);
                                   l--;
                                   lmov=-64;
                                   }
    else if (isKeyPressed(KEY_NSPIRE_1)&&l<SCREEN_HEIGHT-30)
    {
             drawBox_(10, l, 5, 30, black);
         l++;
         lmov=64;
         }
    }
if(players == 1)
{
               if (isKeyPressed(KEY_NSPIRE_8)&&r>1)
    {
                                   drawBox_(SCREEN_WIDTH - 15, r, 5, 30, black);
                                   r--;
                                   rmov=-64;
                                   }
    else if (isKeyPressed(KEY_NSPIRE_2)&&r<SCREEN_HEIGHT-30)
    {
         drawBox_(SCREEN_WIDTH - 15, r, 5, 30, black);
         r++;
         rmov=64;
         }
         if (x/256<SCREEN_WIDTH/2)
         {
            if (y/256-15<l&&l>1  )
    {
                             drawBox_(10, l, 5, 30, black);
                                   l--;
                                   lmov=-64;
                                   }
    else if (y/256-15>l&&l<SCREEN_HEIGHT-30)
    {
             drawBox_(10, l, 5, 30, black);
         l++;
         lmov=64;
         }
         }
           }
    if (x/256-4<15)
    {
                   if ((y/256+4>l)&&(y/256-4<l+30))
                   {
                   xvel=abs(xvel);
                   yvel+=lmov;
                   }
                   }
    if (x/256-4<10)
        {
                die=1;
                lscore++;
        }
        if (x/256+4>SCREEN_WIDTH-10)
        {
                die=1;
                rscore++;
        }


    if(x/256+4>SCREEN_WIDTH-15)
    {
                   if ((y/256+4>r)&&(y/256-4<r+30))
                   {
                   xvel=-abs(xvel);
                   yvel+=rmov;
                   }
                   }
    if (y/256-4<1)
    {
              yvel=-yvel;
              }
    if (y/256+4>SCREEN_HEIGHT)
    {
              yvel=-yvel;
              }
    drawBox_(10, l, 5, 30, green);
    drawBox_(SCREEN_WIDTH - 15, r, 5, 30, green);
    drawDisc_(x/256, y/256, 5, black);
    y+=yvel;
    x+=xvel;
    drawDisc_(x/256, y/256, 5, green);
    sleep(4);
}
}
return 0;
}

int randnum(int s)
{
 return s*46-78/s*57-s+87*s; //Why yes, this is my random number formula :P
}