#include <stdio.h>
#include <windows.h>
#include <time.h>
#include <stdlib.h>

#define frame 20
//the size of the gameframe (x * x)

#define gamespeed 250
//the amount of time the game will wait (in milliseconds) before drawing the next frame
//if we change this we should probably make the gameclock reflect the change
//but for now it just runs at double time

char screen[frame][frame]; //global variables because fuck you
int gameTime = 100;
int score = 0;

int main(void);
void drawframe(void);
void newline(void);
void clearScreen(void);
void waitFor(int millisecs);
void checkForRow(void);
void gravity(void);
void generateObject(void);
int gameOver(void);

/*
THIS CODE SUCKS MAJOR ASS

Known Issues:
gameOver() doesn't actually work
no user input
game clock is directly affected by the game speed (like a nes game lol)
frameDraw is directly affected by the game speed
*/

int main(void)
{
	srand(time(NULL));
	//initialze the screen
	for (int x = 0; x < frame; x++)
		for (int y = 0; y < frame; y++)
			screen[x][y] = ' ';
	for (int i = 0; i < frame; ++i) {
		screen[0][i] = 'x';
		screen[frame - 1][i] = 'x';
		screen[i][0] = 'x';
		screen[i][frame - 1] = 'x';
	}



	printf("TimeLeft: %d Score: %d\n", gameTime--, score);
	generateObject();
	drawframe();
	while (gameTime > 0 && !gameOver())
	{
		waitFor(gamespeed);
		gravity();
		if(gameTime % 9 == 0)
			generateObject();
		checkForRow();
		clearScreen();
		printf("TimeLeft: %d Score: %d\n", gameTime--, score);
		printf("Game over? %d\n", gameOver());
		drawframe();
	}
	clearScreen();
	printf("Game over!\nYou lose idiot!\n");
	return 0;
}

void drawframe(void)
{
	for (int x = 0; x < frame; x++)
	{
		newline();
		for (int y = 0; y < frame; y++)
			printf("%c", screen[x][y]);
	}
}

void newline(void)
{
	printf("\n");
}

void clearScreen()
{
	system("cls");
}

void waitFor(int millisecs)
{
	Sleep(millisecs);
}

void checkForRow(void)
{
	for (int x = 1; x < frame - 1; x++)
	{
		int count = 0;
		for (int y = 0; y < frame; y++)
		{
			if (screen[x][y] != 'x')
				break;
			count++;
			if (count == frame - 1)
			{
				for (int z = 0; z < frame; z++)
					screen[x][z] = ' ';
				screen[x][0] = 'x';
				screen[x][frame - 1] = 'x';
				score += 1000;
			}
		}
	}
}

void gravity(void)
{
	for (int x = frame - 1 ; x > 0; x--)
	{
		for (int y = frame - 1; y > 1; y--)
		{
			if (screen[x][y] == 'x')
			{
				if (screen[x + 1][y] == ' ')
				{
					screen[x][y] = ' ';
					screen[x + 1][y] = 'x';
				}
			}
		}
	}
}

void generateObject(void)
{
	int r = rand() % 6;
	switch (r)
	{
		//creates a box
		case 1:
		{
			screen[1][frame / 2] = 'x';
			screen[1][frame / 2 + 1] = 'x';
			screen[2][frame / 2] = 'x';
			screen[2][frame / 2 + 1] = 'x';
			break;
		}
		//creates an L
		case 2:
		{
			screen[1][frame / 2] = 'x';
			screen[1][frame / 2 + 1] = 'x';
			screen[2][frame / 2] = 'x';
			screen[3][frame / 2] = 'x';
			break;
		}
		//creates a line
		case 3:
		{
			screen[1][frame / 2] = 'x';
			screen[2][frame / 2] = 'x';
			screen[3][frame / 2] = 'x';
			screen[4][frame / 2] = 'x';
			break;
		}
		//creates a z
		case 4:
		{
			screen[1][frame / 2] = 'x';
			screen[2][frame / 2] = 'x';
			screen[2][frame / 2 - 1] = 'x';
			screen[3][frame / 2 - 1] = 'x';
			break;
		}
		//creates a T
		case 5:
		{
			screen[1][frame / 2] = 'x';
			screen[2][frame / 2] = 'x';
			screen[2][frame / 2 + 1] = 'x';
			screen[2][frame / 2 - 1] = 'x';
			break;
		}
	}
}

int gameOver(void)
{
	int xfoundcount = 0;
	for (int x = 1; x < frame - 1; x++)
	{
		for (int y = 1; y < frame - 1; y++)
		{
			if (screen[x][y] == 'x')
			{
				xfoundcount++;
				break;
			}
		}
	}
	if (xfoundcount == frame - 1)
		return 1;
	return 0;
}