// Michael J. Fischer
// CPSC 223b, Spring 2008
// Problem set 4: Flex demo

// This program demonstrates how to use Flex and manage memory properly

#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include "util.h"
#include "flex.h"

int fill( Flex cart );
void process( Flex cart );

int main( void )
{
	// create a new Flex data structure called "cart"
	Flex cart = newFlex();
	
	// put some things into the cart
	while (fill( cart ) != EOF) process( cart );
	
	// done with cart, so clean up
	freeFlex( cart );
	
	// announce termination
	printf( "Goodbye!\n" );
}

// -----------------------------------------------------
int fill( Flex cart ){
	// put some things into the cart
	char buf[100];
	String newStr;
	printf( "Please type a sentence "
			"(single period or ^D ends session): " );
	for (;;) {
		if (scanf( "%99s", buf) == EOF ||
				(strcmp( buf, "." )==0 && lenFlex( cart )==0) ) {
			return EOF;
		}
		// copy contents of buf to new String
		newStr = safe_malloc( strlen( buf )+1 );
		strcpy( newStr, buf );
		insertFlex( cart, newStr );
		if ( buf[strlen(buf)-1] == '.' ) break;
	}
	return 0;
}

// -----------------------------------------------------
void process( Flex cart )
{
	// sort cart
	sortFlex( cart );
	
	// get its length and contents
	int len = lenFlex( cart );
	String* wordList = extractFlex( cart );
	// ExtractFlex passes ownership of wordList
	// and the strings to which its elements point.
	// We are responsible for freeing them when we're
	// done processing them.

	// print out our word list
	for (int k=0; k<len; k++) {
		printf( "word[%2i]=\"%s\"\n", k, wordList[k] );
	}
	
	// free each of the Strings on our word list
	for (int k=0; k<len; k++) {
		free( wordList[k] );
	}

	// free the word list itself
	free( wordList );
}