/*
 * audit.c
 * package audit log functions
 *
 * SPDX-License-Identifier: pkgconf
 *
 * 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>
#include <errno.h>

/*
 * !doc
 *
 * libpkgconf `audit` module
 * =========================
 *
 * The libpkgconf `audit` module contains the functions related to attaching an audit log file
 * to a ``pkgconf_client_t`` object.
 *
 * The audit log format is the same as the output generated by the ``PKG_CONFIG_LOG`` environment
 * variable.
 */

/*
 * !doc
 *
 * .. c:function:: void pkgconf_audit_set_log(pkgconf_client_t *client, FILE *auditf)
 *
 *    Sets the audit log file pointer on `client` to `auditf`.
 *    The callee is responsible for closing any previous log files.
 *
 *    :param pkgconf_client_t* client: The client object to modify.
 *    :param FILE* auditf: The file pointer for the already open log file.
 *    :return: nothing
 */
void
pkgconf_audit_set_log(pkgconf_client_t *client, FILE *auditf)
{
	client->auditf = auditf;
}

/*
 * !doc
 *
 * .. c:function:: void pkgconf_audit_log(pkgconf_client_t *client, const char *format, ...)
 *
 *    Logs a message to the opened audit log (if any).
 *
 *    :param pkgconf_client_t* client: The client object the log message is for.
 *    :param char* format: The format string to use for the log messages.
 *    :return: nothing
 */
void
pkgconf_audit_log(pkgconf_client_t *client, const char *format, ...)
{
	va_list va;

	if (client->auditf == NULL)
		return;

	va_start(va, format);
	if (!pkgconf_output_file_vfmt(client->auditf, format, va))
	{
		// TODO: should probably return here
		pkgconf_error(client, "Failed to output to file: %s", strerror(errno));
	}
	va_end(va);
}

/*
 * !doc
 *
 * .. c:function:: void pkgconf_audit_log_dependency(pkgconf_client_t *client, const pkgconf_pkg_t *dep, const pkgconf_dependency_t *depnode)
 *
 *    Convenience function which logs a dependency node to the opened audit log (if any).
 *
 *    :param pkgconf_client_t* client: The client object the log message is for.
 *    :param pkgconf_pkg_t* dep: The dependency package object being logged.
 *    :param pkgconf_dependency_t* depnode: The dependency object itself being logged.
 *    :return: nothing
 */
void
pkgconf_audit_log_dependency(pkgconf_client_t *client, const pkgconf_pkg_t *dep, const pkgconf_dependency_t *depnode)
{
	if (client->auditf == NULL)
		return;

	if (!pkgconf_output_file_fmt(client->auditf, "%s ", dep->id))
	{
		// TODO: should probably return here
		pkgconf_error(client, "Failed to output to file: %s", strerror(errno));
	}

	if (depnode->version != NULL && depnode->compare != PKGCONF_CMP_ANY)
	{
		if (!pkgconf_output_file_fmt(client->auditf, "%s %s ", pkgconf_pkg_get_comparator(depnode), depnode->version))
		{
			// TODO: should probably return here
			pkgconf_error(client, "Failed to output to file: %s", strerror(errno));
		}
	}

	if (!pkgconf_output_file_fmt(client->auditf, "[%s]\n", dep->version))
	{
		// TODO: should probably return here
		pkgconf_error(client, "Failed to output to file: %s", strerror(errno));
	}
}
