#include <stdio.h>

#include "corr.h"

#define LINE_CAPACITY 1024

int convert_cflags(const corr_t* corr);
void corr_search_file(corr_t* corr, FILE* input);

void corr_init(corr_t* corr)
{
	args_init(&corr->args);
}

int corr_run(corr_t* corr, int argc, char* argv[])
{
	int error = args_analyze(&corr->args, argc, argv);
	if ( error )
		return error;
	
	if ( corr->args.pattern == NULL )
		return args_print_help();

	int cflags = convert_cflags(corr);
	if ( regcomp(&corr->regex, corr->args.pattern, cflags) )
		return fprintf(stderr, "error: invalid regular expression: %s\n", corr->args.pattern), 3;

	corr_search_file(corr, stdin);

	regfree(&corr->regex);
	return 0;
}

void corr_destroy(corr_t* corr)
{
	args_destroy(&corr->args);
}

int convert_cflags(const corr_t* corr)
{
	int cflags = REG_NOSUB;

	if ( corr->args.extended )
		cflags |= REG_EXTENDED;
	if ( corr->args.ignore_case )
		cflags |= REG_ICASE;
	if ( corr->args.new_line )
		cflags |= REG_NEWLINE;

	return cflags;
}

void corr_search_file(corr_t* corr, FILE* input)
{
	int eflags = 0; // REG_NOTBOL | REG_NOTEOL
	//regmatch_t matches[32];
	char line[LINE_CAPACITY];

	while ( fgets(line, LINE_CAPACITY, input) )
		if ( regexec(&corr->regex, line, /*nmatch*/ 0, /*matches*/ NULL, eflags) == 0 )
			printf("%s", line);
}