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/* Copyright (C) 2003 Timothy Ringenbach <omarvo@hotmail.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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
 *
 */

#if !defined(PURPLE_GLOBAL_HEADER_INSIDE) && !defined(PURPLE_COMPILATION)
# error "only <purple.h> may be included directly"
#endif

#ifndef PURPLE_CMDS_H
#define PURPLE_CMDS_H

#include <purpleconversation.h>

/******************************************************************************
 * Structures
 *****************************************************************************/

/**
 * PurpleCmdStatus:
 * @PURPLE_CMD_STATUS_OK: The command executed successfully.
 * @PURPLE_CMD_STATUS_FAILED: The command failed to execute.
 * @PURPLE_CMD_STATUS_NOT_FOUND: The command was not found.
 * @PURPLE_CMD_STATUS_WRONG_ARGS: The wrong number of arguments were passed.
 * @PURPLE_CMD_STATUS_WRONG_PROTOCOL: The command was run with the wrong
 *                                    protocol.
 * @PURPLE_CMD_STATUS_WRONG_TYPE: The Command was ran against the wrong type of
 *                                conversation.
 *
 * The possible results of running a command with purple_cmd_do_command().
 */
typedef enum {
	PURPLE_CMD_STATUS_OK,
	PURPLE_CMD_STATUS_FAILED,
	PURPLE_CMD_STATUS_NOT_FOUND,
	PURPLE_CMD_STATUS_WRONG_ARGS,
	PURPLE_CMD_STATUS_WRONG_PROTOCOL,
	PURPLE_CMD_STATUS_WRONG_TYPE
} PurpleCmdStatus;

/**
 * PurpleCmdRet:
 * @PURPLE_CMD_RET_OK: Everything's okay; Don't look for another command to
 *                     call.
 * @PURPLE_CMD_RET_FAILED: The command failed, but stop looking.
 * @PURPLE_CMD_RET_CONTINUE: Continue, looking for other commands with the same
 *                           name to call.
 *
 * Commands registered with the core return one of these values when run.
 * Normally, a command will want to return one of the first two; in some
 * unusual cases, you might want to have several functions called for a
 * particular command; in this case, they should return
 * #PURPLE_CMD_RET_CONTINUE to cause the core to fall through to other
 * commands with the same name.
 */
typedef enum {
	PURPLE_CMD_RET_OK,
	PURPLE_CMD_RET_FAILED,
	PURPLE_CMD_RET_CONTINUE
} PurpleCmdRet;

/**
 * PurpleCmdFunc:
 * @conversation: The #PurpleConversation where the command is being run.
 * @cmd: The name of the command.
 * @args: The arguments to the command.
 * @error: (out): A return address for a #GError.
 * @data: User data to pass to the function.
 *
 * A function implementing a command, as passed to purple_cmd_register().
 */
typedef PurpleCmdRet (*PurpleCmdFunc)(PurpleConversation *conversation, const gchar *cmd,
                                  gchar **args, gchar **error, void *data);
/**
 * PurpleCmdId:
 *
 * A unique integer representing a command registered with
 * purple_cmd_register(), which can subsequently be passed to
 * purple_cmd_unregister() to unregister that command.
 */
typedef guint PurpleCmdId;

/**
 * PurpleCmdPriority:
 * @PURPLE_CMD_P_VERY_LOW: Lowest priority.
 * @PURPLE_CMD_P_LOW: Low priority.
 * @PURPLE_CMD_P_DEFAULT: Default priority.
 * @PURPLE_CMD_P_PROTOCOL: Priority for protocol plugins.
 * @PURPLE_CMD_P_PLUGIN: Priority for plugins.
 * @PURPLE_CMD_P_ALIAS: Priority for aliasing commands.
 * @PURPLE_CMD_P_HIGH: High priority.
 * @PURPLE_CMD_P_VERY_HIGH: Highest priority.
 *
 * Commands are registered from multiple locations which leads to name
 * collisions.  PurpleCmdPriority is used to determine which command will be
 * run.
 */
typedef enum {
	PURPLE_CMD_P_VERY_LOW  = -1000,
	PURPLE_CMD_P_LOW       =     0,
	PURPLE_CMD_P_DEFAULT   =  1000,
	PURPLE_CMD_P_PROTOCOL  =  2000,
	PURPLE_CMD_P_PLUGIN    =  3000,
	PURPLE_CMD_P_ALIAS     =  4000,
	PURPLE_CMD_P_HIGH      =  5000,
	PURPLE_CMD_P_VERY_HIGH =  6000
} PurpleCmdPriority;

/**
 * PurpleCmdFlag:
 * @PURPLE_CMD_FLAG_IM: Command is usable in IMs.
 * @PURPLE_CMD_FLAG_CHAT: Command is usable in multi-user chats.
 * @PURPLE_CMD_FLAG_PROTOCOL_ONLY: Command is usable only for a particular
 *                                 protocol.
 * @PURPLE_CMD_FLAG_ALLOW_WRONG_ARGS: Incorrect arguments to this command
 *                                    should be accepted anyway.
 *
 * Flags used to set various properties of commands.  Every command should
 * have at least one of #PURPLE_CMD_FLAG_IM and #PURPLE_CMD_FLAG_CHAT set in
 * order to be even slightly useful.
 *
 * See purple_cmd_register().
 */
typedef enum {
	PURPLE_CMD_FLAG_IM               = 0x01,
	PURPLE_CMD_FLAG_CHAT             = 0x02,
	PURPLE_CMD_FLAG_PROTOCOL_ONLY    = 0x04,
	PURPLE_CMD_FLAG_ALLOW_WRONG_ARGS = 0x08
} PurpleCmdFlag;

/**
 * PurpleCommandsUiOps:
 * @register_command: If implemented, the UI is responsible for handling
 *		commands. See @purple_cmd_register for the argument values.
 * @unregister_command: Should be implemented if register_command is
 *		implemented. @name and @prpl_id will have the same value
 *		that were used for the register_command call.
 *
 * Command UI operations;  UIs should implement this if they want to handle
 * commands themselves, rather than relying on the core.
 *
 * See <link linkend="chapter-ui-ops">List of <literal>UiOps</literal>
 * Structures</link>
 *
 * Since: 2.11.0
 */
typedef struct {
	void (*register_command)(const gchar *name, PurpleCmdPriority priority,
				 PurpleCmdFlag flags, const gchar *prpl_id,
				 const gchar *help, PurpleCmdId id);

	void (*unregister_command)(const gchar *name, const gchar *prpl_id);

	/*< private >*/
	void (*_purple_reserved1)(void);
	void (*_purple_reserved2)(void);
	void (*_purple_reserved3)(void);
	void (*_purple_reserved4)(void);
} PurpleCommandsUiOps;

G_BEGIN_DECLS

/**************************************************************************/
/* Commands API                                                           */
/**************************************************************************/

/**
 * purple_cmd_register:
 * @cmd: The command. This should be a UTF-8 (or ASCII) string, with no spaces
 *            or other white space.
 * @args: A string of characters describing to libpurple how to parse this
 *        command's arguments.  If what the user types doesn't match this
 *        pattern, libpurple will keep looking for another command, unless
 *        the flag #PURPLE_CMD_FLAG_ALLOW_WRONG_ARGS is passed in @f.
 *        This string should contain no whitespace, and use a single
 *        character for each argument.  The recognized characters are:
 *        <itemizedlist>
 *          <listitem><literal>'w'</literal>: Matches a single word.</listitem>
 *          <listitem><literal>'W'</literal>: Matches a single word, with
 *                                            formatting.</listitem>
 *          <listitem><literal>'s'</literal>: Matches the rest of the
 *                                            arguments after this point,
 *                                            as a single string.</listitem>
 *          <listitem><literal>'S'</literal>: Same as <literal>'s'</literal>
 *                                            but with formatting.</listitem>
 *        </itemizedlist>
 *        If args is the empty string, then the command accepts no
 *        arguments. The args passed to the callback @func will be a %NULL
 *        terminated array of %NULL terminated strings, and will always
 *        match the number of arguments asked for, unless
 *        #PURPLE_CMD_FLAG_ALLOW_WRONG_ARGS is passed.
 * @p: This is the priority. Higher priority commands will be run first,
 *     and usually the first command will stop any others from being
 *     called.
 * @f: Flags specifying various options about this command, combined with
 *     <literal>|</literal> (bitwise OR). You need to at least pass one of
 *     #PURPLE_CMD_FLAG_IM or #PURPLE_CMD_FLAG_CHAT (you may pass both) in
 *     order for the command to ever actually be called.
 * @protocol_id: If the #PURPLE_CMD_FLAG_PROTOCOL_ONLY flag is set, this is the id
 *                of the protocol to which the command applies (such as
 *                <literal>"prpl-msn"</literal>). If the flag is not set, this
 *                parameter is ignored; pass %NULL (or a humourous string of
 *                your choice!).
 * @func: (scope call): This is the function to call when someone enters this
 *                      command.
 * @helpstr: a whitespace sensitive, UTF-8, HTML string describing how to
 *           use the command.  The preferred format of this string is the
 *           command's name, followed by a space and any arguments it
 *           accepts (if it takes any arguments, otherwise no space),
 *           followed by a colon, two spaces, and a description of the
 *           command in sentence form.  Do not include a slash before the
 *           command name.
 * @data: User defined data to pass to the #PurpleCmdFunc @f.
 *
 * Register a new command with the core.
 *
 * The command will only happen if commands are enabled,
 * which is a UI pref. UIs don't have to support commands at all.
 *
 * Returns: A #PurpleCmdId, which is only used for calling
 *         #purple_cmd_unregister, or 0 on failure.
 */
PurpleCmdId purple_cmd_register(const gchar *cmd, const gchar *args, PurpleCmdPriority p, PurpleCmdFlag f,
                             const gchar *protocol_id, PurpleCmdFunc func, const gchar *helpstr, void *data);

/**
 * purple_cmd_unregister:
 * @id: The #PurpleCmdId to unregister, as returned by #purple_cmd_register.
 *
 * Unregister a command with the core.
 *
 * All registered commands must be unregistered, if they're registered by a plugin
 * or something else that might go away. Normally this is called when the plugin
 * unloads itself.
 */
void purple_cmd_unregister(PurpleCmdId id);

/**
 * purple_cmd_do_command:
 * @conv: The conversation the command was typed in.
 * @cmdline: The command the user typed (including all arguments) as a single string.
 *            The caller doesn't have to do any parsing, except removing the command
 *            prefix, which the core has no knowledge of. cmd should not contain any
 *            formatting, and should be in plain text (no html entities).
 * @markup: This is the same as cmd, but is the formatted version. It should be in
 *               HTML, with < > and &, at least, escaped to html entities, and should
 *               include both the default formatting and any extra manual formatting.
 * @errormsg: If the command failed errormsg is filled in with the appropriate error
 *                 message. It must be freed by the caller with g_free().
 *
 * Do a command.
 *
 * Normally the UI calls this to perform a command. This might also be useful
 * if aliases are ever implemented.
 *
 * Returns: A #PurpleCmdStatus indicating if the command succeeded or failed.
 */
PurpleCmdStatus purple_cmd_do_command(PurpleConversation *conv, const gchar *cmdline,
                                  const gchar *markup, gchar **errormsg);

/**
 * purple_cmd_execute:
 * @id: The command to execute.
 * @conv: The conversation the command was typed in.
 * @cmdline: The command the user typed (only the arguments).
 *            The caller should remove the prefix and the command name.
 *            It should not contain any formatting, and should be
 *            in plain text (no HTML entities).
 *
 * Execute a specific command.
 *
 * The UI calls this to execute a command, after parsing the
 * command name.
 *
 * Returns: %TRUE if the command handled the @cmdline, %FALSE otherwise.
 */
gboolean purple_cmd_execute(PurpleCmdId id, PurpleConversation *conv,
			    const gchar *cmdline);

/**
 * purple_cmd_list:
 * @conv: The conversation, or %NULL.
 *
 * List registered commands.
 *
 * Returns: (element-type utf8) (transfer container): All commands
 * that are valid in the context of @conv, or all commands, if @conv is
 * %NULL.  Don't keep this list around past the main loop, or anything else that
 * might unregister a command, as the <type>const char *</type>'s used get freed
 * then.
 */
GList *purple_cmd_list(PurpleConversation *conv);

/**
 * purple_cmd_help:
 * @conv: The conversation, or %NULL for no context.
 * @cmd: The command. No wildcards accepted, but returns help for all
 *            commands if %NULL.
 *
 * Get the help string for a command.
 *
 * Returns: (element-type utf8) (transfer container): the help strings for a
 *          given command, one node for each matching command.
 */
GList *purple_cmd_help(PurpleConversation *conv, const gchar *cmd);

/**
 * purple_cmds_get_handle:
 *
 * Get the handle for the commands API
 *
 * Returns: The handle
 */
gpointer purple_cmds_get_handle(void);

/**
 * purple_cmds_set_ui_ops:
 * @ops: The UI operations structure.
 *
 * Sets the UI operations structure to be used when registering and
 * unregistering commands.  The UI operations need only be set if the
 * UI wants to handle the commands itself; otherwise, leave it as NULL.
 */
void purple_cmds_set_ui_ops(PurpleCommandsUiOps *ops);

/**
 * purple_cmds_get_ui_ops:
 *
 * Returns the UI operations structure to be used when registering and
 * unregistering commands.
 *
 * Returns: (transfer none): The UI operations structure.
 */
PurpleCommandsUiOps *purple_cmds_get_ui_ops(void);

/**
 * purple_cmds_init:
 *
 * Initialize the commands subsystem.
 */
void purple_cmds_init(void);

/**
 * purple_cmds_uninit:
 *
 * Uninitialize the commands subsystem.
 */
void purple_cmds_uninit(void);

G_END_DECLS

#endif /* PURPLE_CMDS_H */