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

# define WORLD_WIDTH 64 // World width.
# define WORLD_HEIGHT 64 // World height.
# define SCREEN_WIDTH 128 // Screen width.
# define SCREEN_HEIGHT 64 // Screen height.

void mappartdisplaying(int x, int y, unsigned short int * terrain) {
	int firsttile_x = x>>3, firsttile_y = y>>3;
	int base_x = firsttile_x*8, base_y = firsttile_y*8;
	int sx = base_x - x, sy = base_y - y, tx = (SCREEN_WIDTH>>3) + 1, ty = (SCREEN_HEIGHT>>3) + 1;
	int cx, cy, px = sx, py = sy;
	unsigned short type;
	printf("values : %d, %d\n", tx, ty);
	for(cy = 0;cy != ty;cy++){
		for(cx = 0;cx != tx;cx++){
			type = terrain[(firsttile_y+cy)*WORLD_WIDTH+(firsttile_x+cx)];
			printf("type pos : %d, %d, %d, %d\n", cy, cx, tx, (cy*tx+cx));
			switch(type){
				case 1:
					printf("soil  : %d, %d, %d\n", px, py, type); break;
				case 2:
					printf("stone : %d, %d, %d\n", px, py, type); break;
				case 3:
					printf("coal  : %d, %d, %d\n", px, py, type); break;
				default:
					printf("other  : %d, %d, %d\n", px, py, type); break;
			}
			px += 8;
		}
		py += 8;
		px = sx;
	}
}
void generateworld(unsigned short terrain[], int w, int h, int genstart, int genmin, int genmax, int someof, int type) {
	int x = 0, y = genstart, n, i, a, t;
	for(x=0;x!=w;x++){
		srand(clock());
		a = (int)rand() % 2;
		if(a==0){
			for(i=y;i!=h;i++){
				srand(clock());
				t = (int)rand() % 11;
				if(t==0){
					terrain[i*w+x] = someof;
				}else{
					terrain[i*w+x] = type;
				}
			}
		}else if(a==1){
			for(i=y;i!=h;i++){
				terrain[i*w+x] = type;
			}
		}
		srand(clock());
		n = (int)rand() % 2;
		if(n==0 && y<genmax){
			y++;
		}else if(n==1 && y>genmin){
			y--;
		}
	}
}

int main() {
	unsigned short terrain[WORLD_WIDTH*WORLD_HEIGHT];
	int i, x = 403, y;
	for(i=0;i!=WORLD_WIDTH*WORLD_HEIGHT;i++){
		terrain[i] = 0;
	}
	srand(clock());
	generateworld(terrain, WORLD_WIDTH, WORLD_HEIGHT, (int)((rand() % ((WORLD_HEIGHT - 40) - (WORLD_HEIGHT - 60) + 1)) + WORLD_HEIGHT - 60), WORLD_HEIGHT - 60, WORLD_HEIGHT - 40, 0, 1);
	srand(clock());
	generateworld(terrain, WORLD_WIDTH, WORLD_HEIGHT, (int)((rand() % ((WORLD_HEIGHT - 25) - (WORLD_HEIGHT - 40) + 1)) + WORLD_HEIGHT - 40), WORLD_HEIGHT - 40, WORLD_HEIGHT - 25, 3, 2);
	for(i=0;i!=WORLD_HEIGHT;i++){
		if(terrain[i*WORLD_WIDTH+(x>>3)] != 0){
			y = i * 8;
			break;
		}
	}
	y+=200;
	mappartdisplaying(x, y, terrain);
	return 0;
}