/*
 * client.c
 * libpkgconf consumer lifecycle management
 *
 * Copyright (c) 2016 pkgconf authors (see AUTHORS).
 *
 * 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.
 */

#include <libpkgconf/libpkgconf.h>

/*
 * !doc
 *
 * libpkgconf `client` module
 * ==========================
 *
 * The libpkgconf `client` module implements the `pkgconf_client_t` "client" object.
 * Client objects store all necessary state for libpkgconf allowing for multiple instances to run
 * in parallel.
 *
 * Client objects are not thread safe, in other words, a client object should not be shared across
 * thread boundaries.
 */

/*
 * !doc
 *
 * .. c:function:: void pkgconf_client_init(pkgconf_client_t *client, pkgconf_error_handler_func_t error_handler)
 *
 *    Initialise a pkgconf client object.
 *
 *    :param pkgconf_client_t* client: The client to initialise.
 *    :param pkgconf_error_handler_func_t error_handler: An optional error handler to use for logging errors.
 *    :return: nothing
 */
void
pkgconf_client_init(pkgconf_client_t *client, pkgconf_error_handler_func_t error_handler)
{
	client->error_handler = error_handler;
	client->auditf = NULL;

	pkgconf_client_set_sysroot_dir(client, NULL);
	pkgconf_client_set_buildroot_dir(client, NULL);
}

/*
 * !doc
 *
 * .. c:function:: pkgconf_client_t* pkgconf_client_new(pkgconf_error_handler_func_t error_handler)
 *
 *    Allocate and initialise a pkgconf client object.
 *
 *    :param pkgconf_error_handler_func_t error_handler: An optional error handler to use for logging errors.
 *    :return: A pkgconf client object.
 *    :rtype: pkgconf_client_t*
 */
pkgconf_client_t *
pkgconf_client_new(pkgconf_error_handler_func_t error_handler)
{
	pkgconf_client_t *out = calloc(sizeof(pkgconf_client_t), 1);
	pkgconf_client_init(out, error_handler);
	return out;
}

/*
 * !doc
 *
 * .. c:function:: void pkgconf_client_deinit(pkgconf_client_t *client)
 *
 *    Release resources belonging to a pkgconf client object.
 *
 *    :param pkgconf_client_t* client: The client to deinitialise.
 *    :return: nothing
 */
void
pkgconf_client_deinit(pkgconf_client_t *client)
{
	if (client->sysroot_dir != NULL)
		free(client->sysroot_dir);

	if (client->buildroot_dir != NULL)
		free(client->buildroot_dir);

	pkgconf_tuple_free_global(client);
	pkgconf_path_free(&client->dir_list);
	pkgconf_cache_free(client);
}

/*
 * !doc
 *
 * .. c:function:: void pkgconf_client_free(pkgconf_client_t *client)
 *
 *    Release resources belonging to a pkgconf client object and then free the client object itself.
 *
 *    :param pkgconf_client_t* client: The client to deinitialise and free.
 *    :return: nothing
 */
void
pkgconf_client_free(pkgconf_client_t *client)
{
	pkgconf_client_deinit(client);
	free(client);
}

/*
 * !doc
 *
 * .. c:function:: const char *pkgconf_client_get_sysroot_dir(const pkgconf_client_t *client)
 *
 *    Retrieves the client's sysroot directory (if any).
 *
 *    :param pkgconf_client_t* client: The client object being accessed.
 *    :return: A string containing the sysroot directory or NULL.
 *    :rtype: const char *
 */
const char *
pkgconf_client_get_sysroot_dir(const pkgconf_client_t *client)
{
	return client->sysroot_dir;
}

/*
 * !doc
 *
 * .. c:function:: void pkgconf_client_set_sysroot_dir(pkgconf_client_t *client, const char *sysroot_dir)
 *
 *    Sets or clears the sysroot directory on a client object.  Any previous sysroot directory setting is
 *    automatically released if one was previously set.
 *
 *    Additionally, the global tuple ``$(pc_sysrootdir)`` is set as appropriate based on the new setting.
 *
 *    :param pkgconf_client_t* client: The client object being modified.
 *    :param char* sysroot_dir: The sysroot directory to set or NULL to unset.
 *    :return: nothing
 */
void
pkgconf_client_set_sysroot_dir(pkgconf_client_t *client, const char *sysroot_dir)
{
	if (client->sysroot_dir != NULL)
		free(client->sysroot_dir);

	client->sysroot_dir = sysroot_dir != NULL ? strdup(sysroot_dir) : NULL;

	pkgconf_tuple_add_global(client, "pc_sysrootdir", client->sysroot_dir != NULL ? client->sysroot_dir : "/");
}

/*
 * !doc
 *
 * .. c:function:: const char *pkgconf_client_get_buildroot_dir(const pkgconf_client_t *client)
 *
 *    Retrieves the client's buildroot directory (if any).
 *
 *    :param pkgconf_client_t* client: The client object being accessed.
 *    :return: A string containing the buildroot directory or NULL.
 *    :rtype: const char *
 */
const char *
pkgconf_client_get_buildroot_dir(const pkgconf_client_t *client)
{
	return client->buildroot_dir;
}

/*
 * !doc
 *
 * .. c:function:: void pkgconf_client_set_buildroot_dir(pkgconf_client_t *client, const char *buildroot_dir)
 *
 *    Sets or clears the buildroot directory on a client object.  Any previous buildroot directory setting is
 *    automatically released if one was previously set.
 *
 *    Additionally, the global tuple ``$(pc_top_builddir)`` is set as appropriate based on the new setting.
 *
 *    :param pkgconf_client_t* client: The client object being modified.
 *    :param char* buildroot_dir: The buildroot directory to set or NULL to unset.
 *    :return: nothing
 */
void
pkgconf_client_set_buildroot_dir(pkgconf_client_t *client, const char *buildroot_dir)
{
	if (client->buildroot_dir != NULL)
		free(client->buildroot_dir);

	client->buildroot_dir = buildroot_dir != NULL ? strdup(buildroot_dir) : NULL;

	pkgconf_tuple_add_global(client, "pc_top_builddir", client->buildroot_dir != NULL ? client->buildroot_dir : "$(top_builddir)");
}