/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2021
 *	Cameron Katri.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY CAMERON KATRI AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL CAMERON KATRI OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <ctype.h>
#include <libgen.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>

#include "common.h"

static const char *types[11] = { "di", "ln", "so", "pi", "ex", "bd", "cd", "su",
	"sg", "tw", "ow" };

void usage(const char *);
char *tols_colors(char *);
char *tolscolors(char *);

int
main(int argc, char **argv)
{
	if (argc != 2)
		usage(argv[0]);

	char *input = NULL;
	if (strcmp(argv[1], "-") == 0) {
		char *buf = NULL;
		size_t linecap = 0;
		getline(&buf, &linecap, stdin);
		if (buf[sizeof(buf) - 1] == '\n')
			buf[sizeof(buf) - 1] = '\0';
		input = strdup(buf);
		free(buf);
	} else
		input = argv[1];

	if (strchr(input, '='))
		fprintf(stdout, "%s\n", tolscolors(input));
	else
		fprintf(stdout, "%s\n", tols_colors(input));

	return (0);
}

char *
tols_colors(char *lscolors)
{
	char *ls_out = strdup("");

	for (int i = 0; i < 11; i++) {
		if (lscolors[2 * i] == 'x' && lscolors[2 * i + 1] == 'x')
			continue;
		sprintf(ls_out + strlen(ls_out), "%s=", types[i]);
		if (isupper(lscolors[2 * i]))
			sprintf(ls_out + strlen(ls_out), "01;");
		if (isupper(lscolors[2 * i + 1]))
			sprintf(ls_out + strlen(ls_out), "04;");
		if (tolower(lscolors[2 * i]) == 'x')
			sprintf(ls_out + strlen(ls_out), "00");
		else if (tolower(lscolors[2 * i] != 'x'))
			sprintf(ls_out + strlen(ls_out), "3%i", (int)tolower(lscolors[2 * i]) - 97);
		if (tolower(lscolors[2 * i + 1]) != 'x')
			sprintf(ls_out + strlen(ls_out), ";4%i", (int)tolower(lscolors[2 * i + 1]) - 97);
		sprintf(ls_out + strlen(ls_out), ":");
	}
	char *ret = strdup(ls_out);
	free(ls_out);
	return (ret);
}

char *
tolscolors(char *dircolor)
{
	char *ent;
	char key[2] = "", val[MAXKEYLEN] = "";
	char out[22] = "xxxxxxxxxxxxxxxxxxxx";
	struct color color;

	while ((ent = strsep(&dircolor, ":")) != NULL) {
		for (int i = 0; i < 11; i++) {
			if (strncmp(ent, types[i], strlen(types[i])) == 0) {
				sscanf(ent, "%c%c=%s", &key[0], &key[1], val);
				parseansi(val, &color);
				out[2 * i] = color.fg;
				out[2 * i + 1] = color.bg;
			}
		}
	}
	char *ret = strdup(out);
	return (ret);
}

void
usage(const char *progname)
{
	char *path;
	path = strdup(progname);

	(void)fprintf(
	    stderr, "usage: %s LSCOLORS | LS_COLORS\n", basename(path));
	exit(EX_USAGE);
}