/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include "alloc-util.h"

#include "install.h"

#include "install-printf.h"

#include "specifier.h"

#include "string-util.h"

#include "unit-name.h"

static int specifier_prefix_and_instance(char specifier, const void *data, const char *root, const void *userdata, char **ret) {

        const InstallInfo *i = ASSERT_PTR(userdata);

        _cleanup_free_ char *prefix = NULL;

        int r;

        r = unit_name_to_prefix_and_instance(i->name, &prefix);

        if (r < 0)

                return r;

        if (endswith(prefix, "@") && i->default_instance) {

                char *ans;

                ans = strjoin(prefix, i->default_instance);

                if (!ans)

                        return -ENOMEM;

                *ret = ans;

        } else

                *ret = TAKE_PTR(prefix);

        return 0;

}

static int specifier_name(char specifier, const void *data, const char *root, const void *userdata, char **ret) {

        const InstallInfo *i = ASSERT_PTR(userdata);

        if (unit_name_is_valid(i->name, UNIT_NAME_TEMPLATE) && i->default_instance)

                return unit_name_replace_instance(i->name, i->default_instance, ret);

        return strdup_to(ret, i->name);

}

static int specifier_prefix(char specifier, const void *data, const char *root, const void *userdata, char **ret) {

        const InstallInfo *i = ASSERT_PTR(userdata);

        return unit_name_to_prefix(i->name, ret);

}

static int specifier_instance(char specifier, const void *data, const char *root, const void *userdata, char **ret) {

        const InstallInfo *i = ASSERT_PTR(userdata);

        char *instance;

        int r;

        r = unit_name_to_instance(i->name, &instance);

        if (r < 0)

                return r;

        if (isempty(instance)) {

                r = free_and_strdup(&instance, strempty(i->default_instance));

                if (r < 0)

                        return r;

        }

        *ret = instance;

        return 0;

}

static int specifier_last_component(char specifier, const void *data, const char *root, const void *userdata, char **ret) {

        _cleanup_free_ char *prefix = NULL;

        char *dash;

        int r;

        assert(ret);

        r = specifier_prefix(specifier, data, root, userdata, &prefix);

        if (r < 0)

                return r;

        dash = strrchr(prefix, '-');

        if (dash)

                return strdup_to(ret, dash + 1);

        *ret = TAKE_PTR(prefix);

        return 0;

}

int install_name_printf(

                RuntimeScope scope,

                const InstallInfo *info,

                const char *format,

                char **ret) {

        /* This is similar to unit_name_printf() */

        const Specifier table[] = {

                { 'i', specifier_instance,            NULL },

                { 'j', specifier_last_component,      NULL },

                { 'n', specifier_name,                NULL },

                { 'N', specifier_prefix_and_instance, NULL },

                { 'p', specifier_prefix,              NULL },

                COMMON_SYSTEM_SPECIFIERS,

                COMMON_CREDS_SPECIFIERS(scope),

                {}

        };

        assert(info);

        assert(format);

        assert(ret);

        return specifier_printf(format, UNIT_NAME_MAX, table, info->root, info, ret);

}