#include "git-compat-util.h"
#include "parse-options.h"
#include "cache.h"
#include "commit.h"
#include "color.h"
#include "string-list.h"
#include "argv-array.h"
#include "sha1-array.h"

/*----- some often used options -----*/

int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
{
        int v;

        if (!arg) {
                v = unset ? 0 : DEFAULT_ABBREV;
        } else {
                v = strtol(arg, (char **)&arg, 10);
                if (*arg)
                        return opterror(opt, "expects a numerical value", 0);
                if (v && v < MINIMUM_ABBREV)
                        v = MINIMUM_ABBREV;
                else if (v > 40)
                        v = 40;
        }
        *(int *)(opt->value) = v;
        return 0;
}

int parse_opt_approxidate_cb(const struct option *opt, const char *arg,
                             int unset)
{
        *(unsigned long *)(opt->value) = approxidate(arg);
        return 0;
}

int parse_opt_expiry_date_cb(const struct option *opt, const char *arg,
                             int unset)
{
        return parse_expiry_date(arg, (unsigned long *)opt->value);
}

int parse_opt_color_flag_cb(const struct option *opt, const char *arg,
                            int unset)
{
        int value;

        if (!arg)
                arg = unset ? "never" : (const char *)opt->defval;
        value = git_config_colorbool(NULL, arg);
        if (value < 0)
                return opterror(opt,
                        "expects \"always\", \"auto\", or \"never\"", 0);
        *(int *)opt->value = value;
        return 0;
}

int parse_opt_verbosity_cb(const struct option *opt, const char *arg,
                           int unset)
{
        int *target = opt->value;

        if (unset)
                /* --no-quiet, --no-verbose */
                *target = 0;
        else if (opt->short_name == 'v') {
                if (*target >= 0)
                        (*target)++;
                else
                        *target = 1;
        } else {
                if (*target <= 0)
                        (*target)--;
                else
                        *target = -1;
        }
        return 0;
}

int parse_opt_commits(const struct option *opt, const char *arg, int unset)
{
        unsigned char sha1[20];
        struct commit *commit;

        if (!arg)
                return -1;
        if (get_sha1(arg, sha1))
                return error("malformed object name %s", arg);
        commit = lookup_commit_reference(sha1);
        if (!commit)
                return error("no such commit %s", arg);
        commit_list_insert(commit, opt->value);
        return 0;
}

int parse_opt_object_name(const struct option *opt, const char *arg, int unset)
{
        struct object_id oid;

        if (unset) {
                oid_array_clear(opt->value);
                return 0;
        }
        if (!arg)
                return -1;
        if (get_oid(arg, &oid))
                return error(_("malformed object name '%s'"), arg);
        oid_array_append(opt->value, &oid);
        return 0;
}

int parse_opt_tertiary(const struct option *opt, const char *arg, int unset)
{
        int *target = opt->value;
        *target = unset ? 2 : 1;
        return 0;
}

struct option *parse_options_concat(struct option *a, struct option *b)
{
        struct option *ret;
        size_t i, a_len = 0, b_len = 0;

        for (i = 0; a[i].type != OPTION_END; i++)
                a_len++;
        for (i = 0; b[i].type != OPTION_END; i++)
                b_len++;

        ALLOC_ARRAY(ret, st_add3(a_len, b_len, 1));
        for (i = 0; i < a_len; i++)
                ret[i] = a[i];
        for (i = 0; i < b_len; i++)
                ret[a_len + i] = b[i];
        ret[a_len + b_len] = b[b_len]; /* final OPTION_END */

        return ret;
}

int parse_opt_string_list(const struct option *opt, const char *arg, int unset)
{
        struct string_list *v = opt->value;

        if (unset) {
                string_list_clear(v, 0);
                return 0;
        }

        if (!arg)
                return -1;

        string_list_append(v, arg);
        return 0;
}

int parse_opt_noop_cb(const struct option *opt, const char *arg, int unset)
{
        return 0;
}

/**
 * Report that the option is unknown, so that other code can handle
 * it. This can be used as a callback together with
 * OPTION_LOWLEVEL_CALLBACK to allow an option to be documented in the
 * "-h" output even if it's not being handled directly by
 * parse_options().
 */
int parse_opt_unknown_cb(const struct option *opt, const char *arg, int unset)
{
        return -2;
}

/**
 * Recreates the command-line option in the strbuf.
 */
static int recreate_opt(struct strbuf *sb, const struct option *opt,
                const char *arg, int unset)
{
        strbuf_reset(sb);

        if (opt->long_name) {
                strbuf_addstr(sb, unset ? "--no-" : "--");
                strbuf_addstr(sb, opt->long_name);
                if (arg) {
                        strbuf_addch(sb, '=');
                        strbuf_addstr(sb, arg);
                }
        } else if (opt->short_name && !unset) {
                strbuf_addch(sb, '-');
                strbuf_addch(sb, opt->short_name);
                if (arg)
                        strbuf_addstr(sb, arg);
        } else
                return -1;

        return 0;
}

/**
 * For an option opt, recreates the command-line option in opt->value which
 * must be an char* initialized to NULL. This is useful when we need to pass
 * the command-line option to another command. Since any previous value will be
 * overwritten, this callback should only be used for options where the last
 * one wins.
 */
int parse_opt_passthru(const struct option *opt, const char *arg, int unset)
{
        static struct strbuf sb = STRBUF_INIT;
        char **opt_value = opt->value;

        if (recreate_opt(&sb, opt, arg, unset) < 0)
                return -1;

        free(*opt_value);

        *opt_value = strbuf_detach(&sb, NULL);

        return 0;
}

/**
 * For an option opt, recreate the command-line option, appending it to
 * opt->value which must be a argv_array. This is useful when we need to pass
 * the command-line option, which can be specified multiple times, to another
 * command.
 */
int parse_opt_passthru_argv(const struct option *opt, const char *arg, int unset)
{
        static struct strbuf sb = STRBUF_INIT;
        struct argv_array *opt_value = opt->value;

        if (recreate_opt(&sb, opt, arg, unset) < 0)
                return -1;

        argv_array_push(opt_value, sb.buf);

        return 0;
}