/*
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "room_reader.h"

/*
 *	This is going to read the file character by character, growing the buffer to
 *  accomodate the data. Once the buffer is done reading (hits the delimiter) it
 *  flushes the buffer to our array for storage.
 */
int read_room_descriptions(char *rooms_filename, char **room_descriptions) {

	char *buffer_a,
		*buffer_b,
		character;
	int buffer_size = DEFAULT_BUFFER_SIZE,
		room_number = 0,
		buffer_strlen;
	FILE *rooms_file;

	//we've failed for some reason, return appropriately
	if ((rooms_file = fopen(rooms_filename,"r")) == NULL)
		return -1;	

	//start our buffer
	buffer_a = memset(malloc(buffer_size * sizeof(char)),'\0',1);

	do {
		//check to see if we have enough space, if we don't, grow the buffer
		if (strlen(buffer_a) >= (buffer_size - 1)) {
			buffer_b = buffer_a;
			buffer_size *= 2;
			buffer_a = memset(malloc(buffer_size * sizeof(char)),'\0',1);
			strcpy(buffer_a,buffer_b);
			free(buffer_b);
		}

		//get a character
		if (((character = fgetc(rooms_file)) != EOF) && (character != DELIMETER)) {
			//no error and no delimeter, add it to the buffer
			buffer_strlen = strlen(buffer_a);
			buffer_a[buffer_strlen] = character;
			buffer_a[buffer_strlen + 1] = '\0';
		} else {
			//we have an error or the delimeter, flush the buffer
			room_descriptions[room_number] = buffer_a;
			buffer_size = DEFAULT_BUFFER_SIZE;
			buffer_a = memset(malloc(buffer_size * sizeof(char)),'\0',1);
			//increment and leave if we've met our room limit
			room_number++;
			if (room_number >= MAX_ROOMS)
				return room_number;
		}			
		
	} while (!ferror(rooms_file));

	//here we met an EOF or error before reaching our room limit
	return room_number;
}

int main(int argc, char **argv) {

	//test case	
	char *filename = "rooms.txt";
	char **room_descriptions;
	int room_count,i;

	room_descriptions = malloc(MAX_ROOMS * sizeof(void));
	room_count = read_room_descriptions(filename,room_descriptions);

	for (i = 0;i < room_count;i++) {
		printf("%s\n",room_descriptions[i]);
	}
	
	return 0;
}