#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "common.h"
#include "scaffold.h"
#include "macros.h"
#include "repository.h"
#include "dir.h"
#include "commands.h"

#define NEED_REPO_DIR (1 << 0)

const char ani_usage_string[] =
	"usage: ani <command>\n"
	"\n"
	"Commands\n"
	" init     Initialize empty repository\n"
	" change   Show information about a particular change\n"
	" pristine Show information about the repository database\n";

/* List of builtin commands, by name and the function to invoke */
struct cmd {
	const char *name;
	int (*fn)(int, const char **, struct repository *);
	unsigned int flags;
};

static struct cmd commands[] = {
	{ "init", cmd_init, 0 },
	{ "change", cmd_change, NEED_REPO_DIR },
	{ "pristine", cmd_pristine, NEED_REPO_DIR },
};

/**
 * Print usage string and exit.
 */
static void
usage()
{
	printf("%s", ani_usage_string);
	exit(0);
}

static struct cmd *
find_cmd(const char *s)
{
	long unsigned int i;
	struct cmd *p;
	for (i = 0; i < ARRAY_SIZE(commands); i++) {
		p = commands + i;
		if (!strcmp(s, p->name))
			return p;
	}
	return NULL;
}

static int
cmd_main(int argc, const char *argv[])
{
	const char *cmd_name;
	char *pijul_dir = NULL;
	struct repository repo = { 0 };
	struct cmd *command;
	int ret;

	cmd_name = *++argv;
	--argc;
	command = find_cmd(cmd_name);

	if (command == NULL) {
		fprintf(stderr,
			"ani: '%s' is not an ani command. See 'ani -h'\n",
			cmd_name);
		return -1;
	}

	if (command->flags & NEED_REPO_DIR) {
		pijul_dir = find_dotpijul();
		if (!pijul_dir)
			die("no Pijul repository found");
		repo.path = pijul_dir;
	}
	ret = (command->fn)(argc, argv, &repo);
	if (pijul_dir)
		free(pijul_dir);
	return ret;
}

int
main(int argc, const char *argv[])
{
	if (argc == 1)
		usage();

	return cmd_main(argc, argv);
}