#include "builtin.h"
#include "cache.h"
#include "config.h"
#include "parse-options.h"
#include "midx.h"
#include "trace2.h"
#include "object-store.h"

#define BUILTIN_MIDX_WRITE_USAGE \
	N_("git multi-pack-index [<options>] write [--preferred-pack=<pack>]" \
	   "[--refs-snapshot=<path>]")

#define BUILTIN_MIDX_VERIFY_USAGE \
	N_("git multi-pack-index [<options>] verify")

#define BUILTIN_MIDX_EXPIRE_USAGE \
	N_("git multi-pack-index [<options>] expire")

#define BUILTIN_MIDX_REPACK_USAGE \
	N_("git multi-pack-index [<options>] repack [--batch-size=<size>]")

static char const * const builtin_multi_pack_index_write_usage[] = {
	BUILTIN_MIDX_WRITE_USAGE,
	NULL
};
static char const * const builtin_multi_pack_index_verify_usage[] = {
	BUILTIN_MIDX_VERIFY_USAGE,
	NULL
};
static char const * const builtin_multi_pack_index_expire_usage[] = {
	BUILTIN_MIDX_EXPIRE_USAGE,
	NULL
};
static char const * const builtin_multi_pack_index_repack_usage[] = {
	BUILTIN_MIDX_REPACK_USAGE,
	NULL
};
static char const * const builtin_multi_pack_index_usage[] = {
	BUILTIN_MIDX_WRITE_USAGE,
	BUILTIN_MIDX_VERIFY_USAGE,
	BUILTIN_MIDX_EXPIRE_USAGE,
	BUILTIN_MIDX_REPACK_USAGE,
	NULL
};

static struct opts_multi_pack_index {
	char *object_dir;
	const char *preferred_pack;
	const char *refs_snapshot;
	unsigned long batch_size;
	unsigned flags;
	int stdin_packs;
} opts;


static int parse_object_dir(const struct option *opt, const char *arg,
			    int unset)
{
	free(opts.object_dir);
	if (unset)
		opts.object_dir = xstrdup(get_object_directory());
	else
		opts.object_dir = real_pathdup(arg, 1);
	return 0;
}

static struct option common_opts[] = {
	OPT_CALLBACK(0, "object-dir", &opts.object_dir,
	  N_("directory"),
	  N_("object directory containing set of packfile and pack-index pairs"),
	  parse_object_dir),
	OPT_END(),
};

static struct option *add_common_options(struct option *prev)
{
	return parse_options_concat(common_opts, prev);
}

static int git_multi_pack_index_write_config(const char *var, const char *value,
					     void *cb)
{
	if (!strcmp(var, "pack.writebitmaphashcache")) {
		if (git_config_bool(var, value))
			opts.flags |= MIDX_WRITE_BITMAP_HASH_CACHE;
		else
			opts.flags &= ~MIDX_WRITE_BITMAP_HASH_CACHE;
	}

	/*
	 * We should never make a fall-back call to 'git_default_config', since
	 * this was already called in 'cmd_multi_pack_index()'.
	 */
	return 0;
}

static void read_packs_from_stdin(struct string_list *to)
{
	struct strbuf buf = STRBUF_INIT;
	while (strbuf_getline(&buf, stdin) != EOF)
		string_list_append(to, buf.buf);
	string_list_sort(to);

	strbuf_release(&buf);
}

static int cmd_multi_pack_index_write(int argc, const char **argv)
{
	struct option *options;
	static struct option builtin_multi_pack_index_write_options[] = {
		OPT_STRING(0, "preferred-pack", &opts.preferred_pack,
			   N_("preferred-pack"),
			   N_("pack for reuse when computing a multi-pack bitmap")),
		OPT_BIT(0, "bitmap", &opts.flags, N_("write multi-pack bitmap"),
			MIDX_WRITE_BITMAP | MIDX_WRITE_REV_INDEX),
		OPT_BIT(0, "progress", &opts.flags,
			N_("force progress reporting"), MIDX_PROGRESS),
		OPT_BOOL(0, "stdin-packs", &opts.stdin_packs,
			 N_("write multi-pack index containing only given indexes")),
		OPT_FILENAME(0, "refs-snapshot", &opts.refs_snapshot,
			     N_("refs snapshot for selecting bitmap commits")),
		OPT_END(),
	};

	opts.flags |= MIDX_WRITE_BITMAP_HASH_CACHE;

	git_config(git_multi_pack_index_write_config, NULL);

	options = add_common_options(builtin_multi_pack_index_write_options);

	trace2_cmd_mode(argv[0]);

	if (isatty(2))
		opts.flags |= MIDX_PROGRESS;
	argc = parse_options(argc, argv, NULL,
			     options, builtin_multi_pack_index_write_usage,
			     PARSE_OPT_KEEP_UNKNOWN);
	if (argc)
		usage_with_options(builtin_multi_pack_index_write_usage,
				   options);

	FREE_AND_NULL(options);

	if (opts.stdin_packs) {
		struct string_list packs = STRING_LIST_INIT_DUP;
		int ret;

		read_packs_from_stdin(&packs);

		ret = write_midx_file_only(opts.object_dir, &packs,
					   opts.preferred_pack,
					   opts.refs_snapshot, opts.flags);

		string_list_clear(&packs, 0);

		return ret;

	}
	return write_midx_file(opts.object_dir, opts.preferred_pack,
			       opts.refs_snapshot, opts.flags);
}

static int cmd_multi_pack_index_verify(int argc, const char **argv)
{
	struct option *options;
	static struct option builtin_multi_pack_index_verify_options[] = {
		OPT_BIT(0, "progress", &opts.flags,
			N_("force progress reporting"), MIDX_PROGRESS),
		OPT_END(),
	};
	options = add_common_options(builtin_multi_pack_index_verify_options);

	trace2_cmd_mode(argv[0]);

	if (isatty(2))
		opts.flags |= MIDX_PROGRESS;
	argc = parse_options(argc, argv, NULL,
			     options, builtin_multi_pack_index_verify_usage,
			     PARSE_OPT_KEEP_UNKNOWN);
	if (argc)
		usage_with_options(builtin_multi_pack_index_verify_usage,
				   options);

	FREE_AND_NULL(options);

	return verify_midx_file(the_repository, opts.object_dir, opts.flags);
}

static int cmd_multi_pack_index_expire(int argc, const char **argv)
{
	struct option *options;
	static struct option builtin_multi_pack_index_expire_options[] = {
		OPT_BIT(0, "progress", &opts.flags,
			N_("force progress reporting"), MIDX_PROGRESS),
		OPT_END(),
	};
	options = add_common_options(builtin_multi_pack_index_expire_options);

	trace2_cmd_mode(argv[0]);

	if (isatty(2))
		opts.flags |= MIDX_PROGRESS;
	argc = parse_options(argc, argv, NULL,
			     options, builtin_multi_pack_index_expire_usage,
			     PARSE_OPT_KEEP_UNKNOWN);
	if (argc)
		usage_with_options(builtin_multi_pack_index_expire_usage,
				   options);

	FREE_AND_NULL(options);

	return expire_midx_packs(the_repository, opts.object_dir, opts.flags);
}

static int cmd_multi_pack_index_repack(int argc, const char **argv)
{
	struct option *options;
	static struct option builtin_multi_pack_index_repack_options[] = {
		OPT_MAGNITUDE(0, "batch-size", &opts.batch_size,
		  N_("during repack, collect pack-files of smaller size into a batch that is larger than this size")),
		OPT_BIT(0, "progress", &opts.flags,
		  N_("force progress reporting"), MIDX_PROGRESS),
		OPT_END(),
	};

	options = add_common_options(builtin_multi_pack_index_repack_options);

	trace2_cmd_mode(argv[0]);

	if (isatty(2))
		opts.flags |= MIDX_PROGRESS;
	argc = parse_options(argc, argv, NULL,
			     options,
			     builtin_multi_pack_index_repack_usage,
			     PARSE_OPT_KEEP_UNKNOWN);
	if (argc)
		usage_with_options(builtin_multi_pack_index_repack_usage,
				   options);

	FREE_AND_NULL(options);

	return midx_repack(the_repository, opts.object_dir,
			   (size_t)opts.batch_size, opts.flags);
}

int cmd_multi_pack_index(int argc, const char **argv,
			 const char *prefix)
{
	int res;
	struct option *builtin_multi_pack_index_options = common_opts;

	git_config(git_default_config, NULL);

	if (the_repository &&
	    the_repository->objects &&
	    the_repository->objects->odb)
		opts.object_dir = xstrdup(the_repository->objects->odb->path);

	argc = parse_options(argc, argv, prefix,
			     builtin_multi_pack_index_options,
			     builtin_multi_pack_index_usage,
			     PARSE_OPT_STOP_AT_NON_OPTION);

	if (!argc)
		goto usage;

	if (!strcmp(argv[0], "repack"))
		res = cmd_multi_pack_index_repack(argc, argv);
	else if (!strcmp(argv[0], "write"))
		res =  cmd_multi_pack_index_write(argc, argv);
	else if (!strcmp(argv[0], "verify"))
		res =  cmd_multi_pack_index_verify(argc, argv);
	else if (!strcmp(argv[0], "expire"))
		res =  cmd_multi_pack_index_expire(argc, argv);
	else {
		error(_("unrecognized subcommand: %s"), argv[0]);
		goto usage;
	}

	free(opts.object_dir);
	return res;

usage:
	usage_with_options(builtin_multi_pack_index_usage,
			   builtin_multi_pack_index_options);
}