/*
 * Copyright 2014-2016 James Geboski <jgeboski@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _FACEBOOK_UTIL_H_
#define _FACEBOOK_UTIL_H_

/**
 * SECTION:util
 * @section_id: facebook-util
 * @short_description: <filename>facebook-util.h</filename>
 * @title: General Utilities
 *
 * The general utilities.
 */

#include "facebook-glib.h"

/**
 * FB_UTIL_ERROR:
 *
 * The #GQuark of the domain of utility errors.
 */
#define FB_UTIL_ERROR  fb_util_error_quark()

/**
 * FB_UTIL_PTRBIT_GET:
 * @p: The pointer.
 * @b: The bit index.
 *
 * Gets a bit from the pointer.
 *
 * Returns: The bit value.
 */
#define FB_UTIL_PTRBIT_GET(p, b) \
    (GPOINTER_TO_INT(p) & (1 << (b)))

/**
 * FB_UTIL_PTRBIT_SET:
 * @p: The pointer.
 * @b: The bit index.
 * @v: The bit value.
 *
 * Sets a bit in the pointer.
 */
#define FB_UTIL_PTRBIT_SET(p, b, v) \
    G_STMT_START { \
        gint __tmp; \
        __tmp = GPOINTER_TO_INT(p); \
        __tmp &= ~(1 << (b)); \
        __tmp |= ((v) << (b)); \
        (p) = GINT_TO_POINTER(__tmp); \
    } G_STMT_END

/**
 * FbDebugLevel:
 * @FB_UTIL_DEBUG_LEVEL_MISC: Miscellaneous message.
 * @FB_UTIL_DEBUG_LEVEL_INFO: Information message.
 * @FB_UTIL_DEBUG_LEVEL_WARN: Warning message.
 * @FB_UTIL_DEBUG_LEVEL_ERROR: Error message.
 * @FB_UTIL_DEBUG_LEVEL_FATAL: Fatal message.
 *
 * The types of log messages.
 */
typedef enum
{
    FB_UTIL_DEBUG_LEVEL_MISC,
    FB_UTIL_DEBUG_LEVEL_INFO,
    FB_UTIL_DEBUG_LEVEL_WARN,
    FB_UTIL_DEBUG_LEVEL_ERROR,
    FB_UTIL_DEBUG_LEVEL_FATAL
} FbDebugLevel;

/**
 * FbUtilError:
 * @FB_UTIL_ERROR_GENERAL: General failure.
 *
 * The error codes for the #FB_UTIL_ERROR domain.
 */
typedef enum
{
    FB_UTIL_ERROR_GENERAL
} FbUtilError;

/**
 * fb_util_error_quark:
 *
 * Gets the #GQuark of the domain of utility errors.
 *
 * Returns: The #GQuark of the domain.
 */
GQuark
fb_util_error_quark(void);

/**
 * fb_util_debug:
 * @level: The #FbDebugLevel.
 * @format: The format string literal.
 * @...: The arguments for @format.
 *
 * Logs a debugging message.
 */
void
fb_util_debug(FbDebugLevel level, const gchar *format, ...)
              G_GNUC_PRINTF(2, 3);

/**
 * fb_util_vdebug:
 * @level: The #FbDebugLevel.
 * @format: The format string literal.
 * @ap: The #va_list.
 *
 * Logs a debugging message.
 */
void
fb_util_vdebug(FbDebugLevel level, const gchar *format, va_list ap);

/**
 * fb_util_debug_misc:
 * @format: The format string literal.
 * @...: The arguments for @format.
 *
 * Logs a debugging message with the level of
 * #FB_UTIL_DEBUG_LEVEL_MISC.
 */
void
fb_util_debug_misc(const gchar *format, ...)
                   G_GNUC_PRINTF(1, 2);

/**
 * fb_util_debug_info:
 * @format: The format string literal.
 * @...: The arguments for @format.
 *
 * Logs a debugging message with the level of
 * #FB_UTIL_DEBUG_LEVEL_INFO.
 */
void
fb_util_debug_info(const gchar *format, ...)
                   G_GNUC_PRINTF(1, 2);

/**
 * fb_util_debug_warn:
 * @format: The format string literal.
 * @...: The arguments for @format.
 *
 * Logs a debugging message with the level of
 * #FB_UTIL_DEBUG_LEVEL_WARN.
 */
void
fb_util_debug_warn(const gchar *format, ...)
                   G_GNUC_PRINTF(1, 2);

/**
 * fb_util_debug_error:
 * @format: The format string literal.
 * @...: The arguments for @format.
 *
 * Logs a debugging message with the level of
 * #FB_UTIL_DEBUG_LEVEL_ERROR.
 */
void
fb_util_debug_error(const gchar *format, ...)
                    G_GNUC_PRINTF(1, 2);

/**
 * fb_util_debug_fatal:
 * @format: The format string literal.
 * @...: The arguments for @format.
 *
 * Logs a debugging message with the level of
 * #FB_UTIL_DEBUG_LEVEL_FATAL.
 */
void
fb_util_debug_fatal(const gchar *format, ...)
                    G_GNUC_PRINTF(1, 2);

/**
 * fb_util_debug_hexdump:
 * @level: The #FbDebugLevel.
 * @bytes: The #GByteArray.
 * @format: The format string literal.
 * @...: The arguments for @format.
 *
 * Logs a hexdump of a #GByteArray.
 */
void
fb_util_debug_hexdump(FbDebugLevel level, const GByteArray *bytes,
                      const gchar *format, ...)
                      G_GNUC_PRINTF(3, 4);

/**
 * fb_util_get_locale:
 *
 * Gets the locale string (ex: en_US) from the system. The returned
 * string should be freed with #g_free() when no longer needed.
 *
 * Returns: The locale string.
 */
gchar *
fb_util_get_locale(void);

/**
 * fb_util_rand_alnum:
 * @len: The length of the string.
 *
 * Gets a random alphanumeric (A-Za-z0-9) string. This function should
 * *not* be relied on for cryptographic operations. The returned string
 * should be freed with #g_free() when no longer needed.
 *
 * Returns: The alphanumeric string.
 */
gchar *
fb_util_rand_alnum(guint len);

/**
 * fb_util_rand_uuid:
 *
 * Gets a random UUID string. The returned string should be freed with
 * #g_free() when no longer needed.
 *
 * Returns: The UUID string.
 */
gchar *
fb_util_rand_uuid(void);

/**
 * fb_util_strtest:
 * @str: The string.
 * @type: The #GAsciiType.
 *
 * Tests if the string only contains characters allowed by the
 * #GAsciiType. More than one type can be specified by ORing the types
 * together.
 *
 * Returns: #TRUE if the string only contains characters allowed by the
 *          #GAsciiType, otherwise #FALSE.
 */
gboolean
fb_util_strtest(const gchar *str, GAsciiType type);

/**
 * fb_util_zlib_test:
 * @bytes: The #GByteArray.
 *
 * Tests if the #GByteArray is zlib compressed.
 *
 * Returns: #TRUE if the #GByteArray is compressed, otherwise #FALSE.
 */
gboolean
fb_util_zlib_test(const GByteArray *bytes);

/**
 * fb_util_zlib_deflate:
 * @bytes: The #GByteArray.
 * @error: The return location for the #GError or #NULL.
 *
 * Deflates a #GByteArray with zlib. The returned #GByteArray should be
 * freed with #g_byte_array_free() when no longer needed.
 *
 * Returns: The deflated #GByteArray or #NULL on error.
 */
GByteArray *
fb_util_zlib_deflate(const GByteArray *bytes, GError **error);

/**
 * fb_util_zlib_inflate:
 * @bytes: The #GByteArray.
 * @error: The return location for the #GError or #NULL.
 *
 * Inflates a #GByteArray with zlib. The returned #GByteArray should be
 * freed with #g_byte_array_free() when no longer needed.
 *
 * Returns: The inflated #GByteArray or #NULL on error.
 */
GByteArray *
fb_util_zlib_inflate(const GByteArray *bytes, GError **error);

/**
 * fb_util_urlsafe_base64_encode:
 * @data: the binary data to encode.
 * @len: the length of data
 *
 * Wrapper around g_base64_encode() which substitutes '-' instead of '+'
 * and '_' instead of '/' and removes the padding
 *
 * Returns: A newly allocated string.
 */

gchar *
fb_util_urlsafe_base64_encode(const guchar *data, gsize len);

/**
 * fb_util_gen_sso_verifier:
 * @challenge: base64 of sha256 of verifier
 * @verifier: base64 of random data
 * @req_id: base64 of random data
 *
 * Generates the challenge/response parameters used for the workchat SSO auth.
 * All parameters are output parameters.
 */
void
fb_util_gen_sso_verifier(gchar **challenge, gchar **verifier, gchar **req_id);

#endif /* _FACEBOOK_UTIL_H_ */