/*
 * cmd/ifparse.c
 * Purpose: Redisplay /e/n/i in alternative formats.
 *
 * Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * This software is provided 'as is' and without any warranty, express or
 * implied.  In no event shall the authors be liable for any damages arising
 * from the use of this software.
 */

#define _GNU_SOURCE
#include <fnmatch.h>
#include <stdio.h>
#include <string.h>
#include <getopt.h>
#include "libifupdown/libifupdown.h"
#include "cmd/multicall.h"
#include "cmd/pretty-print-iface.h"

static bool show_all = false;
static bool allow_undefined = false;

static void
set_show_all(const char *arg)
{
	(void) arg;

	show_all = true;
}

static void
set_allow_undefined(const char *arg)
{
	(void) arg;

	allow_undefined = true;
}

static struct if_option local_options[] = {
	{'A', "all", NULL, "show all interfaces", false, set_show_all},
	{'U', "allow-undefined", NULL, "allow querying undefined (virtual) interfaces", false, set_allow_undefined},
};

static struct if_option_group local_option_group = {
	.desc = "Program-specific options",
	.group_size = ARRAY_SIZE(local_options),
	.group = local_options
};

int
ifparse_main(int argc, char *argv[])
{
	struct lif_dict state = {};
	struct lif_dict collection = {};
	struct lif_interface_file_parse_state parse_state = {
		.collection = &collection,
	};

	lif_interface_collection_init(&collection);

	if (!lif_state_read_path(&state, exec_opts.state_file))
	{
		fprintf(stderr, "%s: could not parse %s\n", argv0, exec_opts.state_file);
		return EXIT_FAILURE;
	}

	if (!lif_interface_file_parse(&parse_state, exec_opts.interfaces_file))
	{
		fprintf(stderr, "%s: could not parse %s\n", argv0, exec_opts.interfaces_file);
		return EXIT_FAILURE;
	}

	if (match_opts.property == NULL && lif_lifecycle_count_rdepends(&exec_opts, &collection) == -1)
	{
		fprintf(stderr, "%s: could not validate dependency tree\n", argv0);
		return EXIT_FAILURE;
	}

	if (!lif_compat_apply(&collection))
	{
		fprintf(stderr, "%s: failed to apply compatibility glue\n", argv0);
		return EXIT_FAILURE;
	}

	if (show_all)
	{
		struct lif_node *n;

		LIF_DICT_FOREACH(n, &collection)
		{
			struct lif_dict_entry *entry = n->data;

			prettyprint_interface_eni(entry->data);
		}

		return EXIT_SUCCESS;
	}

	if (optind >= argc)
		generic_usage(self_applet, EXIT_FAILURE);

	int idx = optind;
	for (; idx < argc; idx++)
	{
		struct lif_dict_entry *entry = lif_dict_find(&collection, argv[idx]);
		struct lif_interface *iface = NULL;

		if (entry != NULL)
			iface = entry->data;

		if (entry == NULL && allow_undefined)
			iface = lif_interface_collection_find(&collection, argv[idx]);

		if (iface == NULL)
		{
			fprintf(stderr, "%s: unknown interface %s\n", argv0, argv[idx]);
			return EXIT_FAILURE;
		}

		prettyprint_interface_eni(iface);
	}

	return EXIT_SUCCESS;
}

struct if_applet ifparse_applet = {
	.name = "ifparse",
	.desc = "redisplay interface configuration",
	.main = ifparse_main,
	.usage = "ifparse [options] <interfaces>\n  ifquery [options] --all",
	.manpage = "8 ifparse",
	.groups = { &global_option_group, &match_option_group, &exec_option_group, &local_option_group },
};