/*
** Copyright (C) 2011-2020 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
**
** 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 3, 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, write to the Free Software Foundation,
** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**
*/

#ifndef MU_FLAGS_HH__
#define MU_FLAGS_HH__

#include <glib.h>
#include <utils/mu-utils.hh>

namespace Mu {

enum MuFlags {
	MU_FLAG_NONE = 0,

	/* next 6 are seen in the file-info part of maildir message
	 * file names, ie., in a name like "1234345346:2,<fileinfo>",
	 * <fileinfo> consists of zero or more of the following
	 * characters (in ascii order) */
	MU_FLAG_DRAFT   = 1 << 0,
	MU_FLAG_FLAGGED = 1 << 1,
	MU_FLAG_PASSED  = 1 << 2,
	MU_FLAG_REPLIED = 1 << 3,
	MU_FLAG_SEEN    = 1 << 4,
	MU_FLAG_TRASHED = 1 << 5,

	/* decides on cur/ or new/ in the maildir */
	MU_FLAG_NEW = 1 << 6,

	/* content flags -- not visible in the filename, but used for
	 * searching */
	MU_FLAG_SIGNED     = 1 << 7,
	MU_FLAG_ENCRYPTED  = 1 << 8,
	MU_FLAG_HAS_ATTACH = 1 << 9,

	/* pseudo-flag, only for queries, so we can search for
	 * flag:unread, which is equivalent to 'flag:new OR NOT
	 * flag:seen' */
	MU_FLAG_UNREAD = 1 << 10,

	/* other content flags */
	MU_FLAG_LIST = 1 << 11
};
MU_ENABLE_BITOPS(MuFlags);

#define MU_FLAG_INVALID ((MuFlags)-1)

enum MuFlagType {
	MU_FLAG_TYPE_MAILFILE = 1 << 0,
	MU_FLAG_TYPE_MAILDIR  = 1 << 1,
	MU_FLAG_TYPE_CONTENT  = 1 << 2,
	MU_FLAG_TYPE_PSEUDO   = 1 << 3
};
MU_ENABLE_BITOPS(MuFlagType);

#define MU_FLAG_TYPE_ANY     ((MuFlagType)-1)
#define MU_FLAG_TYPE_INVALID ((MuFlagType)-1)

/**
 * Get the type of flag (mailfile, maildir, pseudo or content)
 *
 * @param flag a MuFlag
 *
 * @return the flag type or MU_FLAG_TYPE_INVALID in case of error
 */
MuFlagType mu_flag_type(MuFlags flag) G_GNUC_CONST;

/**
 * Get the flag character
 *
 * @param flag a MuFlag (single)
 *
 * @return the character, or 0 if it's not a valid flag
 */
char mu_flag_char(MuFlags flag) G_GNUC_CONST;

/**
 * Get the flag name
 *
 * @param flag a single MuFlag
 *
 * @return the name (don't free) as string or NULL in case of error
 */
const char* mu_flag_name(MuFlags flag) G_GNUC_CONST;

/**
 * Get the string representation of an OR'ed set of flags
 *
 * @param flags MuFlag (OR'ed)
 * @param types allowable types (OR'ed) for the result; the rest is ignored
 *
 * @return The string representation (static, don't free), or NULL in
 * case of error
 */
const char* mu_flags_to_str_s(MuFlags flags, MuFlagType types);

/**
 * Get the (OR'ed) flags corresponding to a string representation
 *
 * @param str the file info string
 * @param types the flag types to accept (other will be ignored)
 * @param ignore invalid if TRUE, ignore invalid flags, otherwise return
 * MU_FLAG_INVALID if an invalid flag is encountered
 *
 * @return the (OR'ed) flags
 */
MuFlags mu_flags_from_str(const char* str, MuFlagType types, gboolean ignore_invalid);

/**
 * Get the MuFlag char for some flag name
 *
 * @param str a flag name
 *
 * @return a flag character, or 0
 */
MuFlags mu_flag_char_from_name(const char* str);

/**
 * return the concatenation of all non-standard file flags in str
 * (ie., characters other than DFPRST) as a newly allocated string.
 *
 * @param str the file info string
 *
 * @return concatenation of all non-standard flags, as a string; free
 * with g_free when done. If there are no such flags, return NULL.
 */
char* mu_flags_custom_from_str(const char* str) G_GNUC_WARN_UNUSED_RESULT;

/**
 * Update #oldflags with the flags in #str, where #str consists of the
 * the normal flag characters, but prefixed with either '+' or '-',
 * which means resp. "add this flag" or "remove this flag" from
 * oldflags.  So, e.g. "-N+S" would unset the NEW flag and set the
 * SEEN flag, without affecting other flags.
 *
 * @param str the string representation
 * @param old flags to update
 * @param types the flag types to accept (other will be ignored)
 *
 * @return
 */
MuFlags mu_flags_from_str_delta(const char* str, MuFlags oldflags, MuFlagType types);

typedef void (*MuFlagsForeachFunc)(MuFlags flag, gpointer user_data);

/**
 * call a function for each available flag
 *
 * @param func a function to call
 * @param user_data a user pointer to pass to the function
 */
void mu_flags_foreach(MuFlagsForeachFunc func, gpointer user_data);

} // namespace Mu

#endif /*__MU_FLAGS_H__*/