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

void setBool();
void notePoss();
void getPonse();
void printMaze();

/* Master maze.  Layout: maze[column][row][nsew passable] */
int maze[3][3][4]={ {{0,1,1,0}, {1,1,0,0}, {1,0,0,0}}, {{0,0,1,1}, {0,1,0,0,}, {1,0,1,0}}, {{0,1,0,1}, {1,1,0,0}, {1,0,0,1}} };
int north=0, south=0, east=0, west=0;	/*initializes booleans(well, faked ones) for use later*/
int again=1;
int col=0, row=2;	/* Player's starting point in maze. */


/* main() : intro; while loop->set nsew passability, let user know where they can go, parse response. */
void main(void) {
	printf("Moza 0.1: Parsing a Maze Game\tby Katie Rivard, July 2000\n\nWelcome to an exercise in game programming in C.  It's not a great attempt, but it does some limited text parsing and navigation.  Type '?' for instructions.  Enjoy.\n\n");
	while(again) {
	setBool();
	notePoss();
	getPonse();
	}
}


/* setBool() : Looks at the values in the master maze, and determines whether the player can go 
north, south, east or west, which are much easier to type than maze[col][row][{0,1,2,3}] */
void setBool() {
	north=0;
	south=0;
	east=0;
	west=0;
	if (maze[col][row][0]) north=1;
	if (maze[col][row][1]) south=1;
	if (maze[col][row][2]) east=1;
	if (maze[col][row][3]) west=1;
}


/* notePoss() : Prints the directions you can go from your current position, based on the values
set by setBool() */
void notePoss() {
	char cnorth[8], csouth[8], ceast[7], cwest[7];
	/* coordinate info for debugging:
	printf("You are at %d,%d.\n", col, row);
	printf("North=%d. South=%d. East=%d. West=%d.\n", north, south, east, west);
	*/
	
	/*1,1 is the location of the final point in the maze.*/
	if(col==1 && row==1) { printf("You've won!! (What an accomplishment...)\n"); again=0; }
	else {
		if(north) {strcpy(cnorth, "north\t"); }
			else { strcpy(cnorth, ""); }
		printf("You may go: \t%s", cnorth);
		if(south) {strcpy(csouth, "south\t");}
			else { strcpy(csouth, ""); }
		printf("%s",  csouth);
		if(east) {strcpy(ceast, "east\t"); }
			else { strcpy(ceast, ""); }
		printf("%s",  ceast);
		if(west) {strcpy(cwest, "west\t"); }
			else {strcpy(cwest, "");}
		printf("%s\n", cwest);
	}
}


/* getPonse() : Parses submitted text.  This particular game only supports single-character commands. */
void getPonse() {
	char ponse[2];
	printf(">");
	scanf("%c%c", &ponse[0], &ponse[1]);  /*scans 2 characters, the command and the \n. 
							getc() doesn't work on my machine, otherwise I'd have used that instead.*/
	switch(ponse[0]) {
		case 'n': if(north) {
				row+= -1;
				break; 
				}else{
				printf("You slam into a wall.  Wanna try again?\n");
				break;
				}
		case 's':if(south) {
				row+= 1;
				break; 
				}else{
				printf("You slam into a wall.  Wanna try again?\n");
				break;
				}
		case 'e':if(east) {
				col+= 1;
				break; 
				}else{
				printf("You slam into a wall.  Wanna try again?\n");
				break;
				}
		case 'w':if(west) {
				col+= -1;
				break; 
				}else{
				printf("You slam into a wall.  Wanna try again?\n");
				break;
				}
		case 'q': again=0;
				break;
		case '?': printf("HELP:\nn\tnorth\ns\tsouth\ne\teast\nw\twest\nq\tquit\n?\thelp");
				break;
		default: printf("'scuse me?\n");
				break;
	}
}


/* printMaze() : Prints out a copy of the maze, grid-style.  Each row of the grid is a column, each column of the grid is a row.
The four-digit number in each grid position is the passability of the four cardinal direcitons(n, s, e, w).
Confusing, yes, but operable, and only took 5 minutes to grind out. */
void printMaze() {
	int i, n, q;
	for(i=0; i<3; i++) {
		col=i;
		for(n=0; n<3; n++) {
			row=n;
			for(q=0; q<4; q++) {
				printf("%d",maze[col][row][q]);
			}
		printf("\t");
		}
	printf("\n");
	}
}