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/**
 * @file plugins.h Plugins API
 * @ingroup core
 * @see @ref plugin-signals
 * @see @ref plugin-ids
 * @see @ref plugin-i18n
 */

/* purple
 *
 * Purple is the legal property of its developers, whose names are too numerous
 * to list here.  Please refer to the COPYRIGHT file distributed with this
 * source distribution.
 *
 * 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
 */
#ifndef _PURPLE_PLUGINS_H_
#define _PURPLE_PLUGINS_H_

#include <gplugin.h>

/** Returns an ABI version to set in plugins using major and minor versions */
#define PURPLE_PLUGIN_ABI_VERSION(major,minor) ((major << 16) + minor)
/** Returns the major version from an ABI version */
#define PURPLE_PLUGIN_ABI_MAJOR_VERSION(abi)   (abi >> 16)
/** Returns the minor version from an ABI version */
#define PURPLE_PLUGIN_ABI_MINOR_VERSION(abi)   (abi & 0xFFFF)

#define PURPLE_TYPE_PLUGIN             GPLUGIN_TYPE_PLUGIN
#define PURPLE_PLUGIN(obj)             GPLUGIN_PLUGIN(obj)
#define PURPLE_PLUGIN_CLASS(klass)     GPLUGIN_PLUGIN_CLASS(klass)
#define PURPLE_IS_PLUGIN(obj)          GPLUGIN_IS_PLUGIN(obj)
#define PURPLE_IS_PLUGIN_CLASS(klass)  GPLUGIN_IS_PLUGIN_CLASS(klass)
#define PURPLE_PLUGIN_GET_CLASS(obj)   GPLUGIN_PLUGIN_GET_CLASS(obj)

/**
 * Represents a plugin handle.
 * This type is an alias for GPluginPlugin.
 */
typedef GPluginPlugin PurplePlugin;

/**
 * The base class for all #PurplePlugin's.
 * This type is an alias for GPluginPluginClass.
 */
typedef GPluginPluginClass PurplePluginClass;

#define PURPLE_TYPE_PLUGIN_INFO             (purple_plugin_info_get_type())
#define PURPLE_PLUGIN_INFO(obj)             (G_TYPE_CHECK_INSTANCE_CAST((obj), PURPLE_TYPE_PLUGIN_INFO, PurplePluginInfo))
#define PURPLE_PLUGIN_INFO_CLASS(klass)     (G_TYPE_CHECK_CLASS_CAST((klass), PURPLE_TYPE_PLUGIN_INFO, PurplePluginInfoClass))
#define PURPLE_IS_PLUGIN_INFO(obj)          (G_TYPE_CHECK_INSTANCE_TYPE((obj), PURPLE_TYPE_PLUGIN_INFO))
#define PURPLE_IS_PLUGIN_INFO_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE((klass), PURPLE_TYPE_PLUGIN_INFO))
#define PURPLE_PLUGIN_INFO_GET_CLASS(obj)   (G_TYPE_INSTANCE_GET_CLASS((obj), PURPLE_TYPE_PLUGIN_INFO, PurplePluginInfoClass))

/** @copydoc _PurplePluginInfo */
typedef struct _PurplePluginInfo PurplePluginInfo;
/** @copydoc _PurplePluginInfoClass */
typedef struct _PurplePluginInfoClass PurplePluginInfoClass;

#define PURPLE_TYPE_PLUGIN_ACTION  (purple_plugin_action_get_type())

/** @copydoc _PurplePluginAction */
typedef struct _PurplePluginAction PurplePluginAction;

#include "pluginpref.h"

typedef void (*PurplePluginActionCallback)(PurplePluginAction *);
typedef PurplePluginPrefFrame *(*PurplePluginPrefFrameCallback)(PurplePlugin *);

/**
 * Holds information about a plugin.
 */
struct _PurplePluginInfo {
	/*< private >*/
	GPluginPluginInfo parent;
};

/**
 * PurplePluginInfoClass:
 *
 * The base class for all #PurplePluginInfo's.
 */
struct _PurplePluginInfoClass {
	/*< private >*/
	GPluginPluginInfoClass parent_class;

	void (*_purple_reserved1)(void);
	void (*_purple_reserved2)(void);
	void (*_purple_reserved3)(void);
	void (*_purple_reserved4)(void);
};

/**
 * Represents an action that the plugin can perform. This shows up in the Tools
 * menu, under a submenu with the name of the plugin.
 */
struct _PurplePluginAction {
	char *label;
	PurplePluginActionCallback callback;
	PurplePlugin *plugin;
};

G_BEGIN_DECLS

/**************************************************************************/
/** @name Plugin API                                                      */
/**************************************************************************/
/*@{*/

/**
 * Attempts to load a plugin.
 *
 * @param plugin The plugin to load.
 *
 * @return @c TRUE if successful, or @c FALSE otherwise.
 *
 * @see purple_plugin_unload()
 */
gboolean purple_plugin_load(PurplePlugin *plugin);

/**
 * Unloads the specified plugin.
 *
 * @param plugin The plugin handle.
 *
 * @return @c TRUE if successful, or @c FALSE otherwise.
 *
 * @see purple_plugin_load()
 */
gboolean purple_plugin_unload(PurplePlugin *plugin);

/**
 * Returns whether or not a plugin is currently loaded.
 *
 * @param plugin The plugin.
 *
 * @return @c TRUE if loaded, or @c FALSE otherwise.
 */
gboolean purple_plugin_is_loaded(const PurplePlugin *plugin);

/**
 * Returns a plugin's filename, along with the path.
 *
 * @param info The plugin.
 *
 * @return The plugin's filename.
 */
const gchar *purple_plugin_get_filename(const PurplePlugin *plugin);

/**
 * Returns a plugin's #PurplePluginInfo instance.
 *
 * @param info The plugin.
 *
 * @return The plugin's #PurplePluginInfo instance.
 */
PurplePluginInfo *purple_plugin_get_info(const PurplePlugin *plugin);

/**
 * Adds a new action to a plugin.
 *
 * @param plugin   The plugin to add the action to.
 * @param label    The description of the action to show to the user.
 * @param callback The callback to call when the user selects this action.
 */
void purple_plugin_add_action(PurplePlugin *plugin, const char* label,
                              PurplePluginActionCallback callback);

/**
 * Disable a plugin.
 *
 * This function adds the plugin to a list of plugins to "disable at the next
 * startup" by excluding said plugins from the list of plugins to save.  The
 * UI needs to call purple_plugins_save_loaded() after calling this for it
 * to have any effect.
 */
void purple_plugin_disable(PurplePlugin *plugin);

/*@}*/

/**************************************************************************/
/** @name PluginInfo API                                                  */
/**************************************************************************/
/*@{*/

/**
 * Returns the GType for the PurplePluginInfo object.
 */
GType purple_plugin_info_get_type(void);

/**
 * Returns a plugin's ID.
 *
 * @param info The plugin's info instance.
 *
 * @return The plugin's ID.
 */
const gchar *purple_plugin_info_get_id(const PurplePluginInfo *info);

/**
 * Returns a plugin's name.
 *
 * @param info The plugin's info instance.
 *
 * @return The name of the plugin, or @c NULL.
 */
const gchar *purple_plugin_info_get_name(const PurplePluginInfo *info);

/**
 * Returns a plugin's version.
 *
 * @param info The plugin's info instance.
 *
 * @return The version of the plugin, or @c NULL.
 */
const gchar *purple_plugin_info_get_version(const PurplePluginInfo *info);

/**
 * Returns a plugin's primary category.
 *
 * @param info The plugin's info instance.
 *
 * @return The primary category of the plugin, or @c NULL.
 */
const gchar *purple_plugin_info_get_category(const PurplePluginInfo *info);

/**
 * Returns a plugin's summary.
 *
 * @param info The plugin's info instance.
 *
 * @return The summary of the plugin, or @c NULL.
 */
const gchar *purple_plugin_info_get_summary(const PurplePluginInfo *info);

/**
 * Returns a plugin's description.
 *
 * @param info The plugin's info instance.
 *
 * @return The description of the plugin, or @c NULL.
 */
const gchar *purple_plugin_info_get_description(const PurplePluginInfo *info);

/**
 * Returns a plugin's author.
 *
 * @param info The plugin's info instance.
 *
 * @return The author of the plugin, or @c NULL.
 */
const gchar *purple_plugin_info_get_author(const PurplePluginInfo *info);

/**
 * Returns a plugin's website.
 *
 * @param info The plugin's info instance.
 *
 * @return The website of the plugin, or @c NULL.
 */
const gchar *purple_plugin_info_get_website(const PurplePluginInfo *info);

/**
 * Returns the path to a plugin's icon.
 *
 * @param info The plugin's info instance.
 *
 * @return The path to the plugin's icon, or @c NULL.
 */
const gchar *purple_plugin_info_get_icon(const PurplePluginInfo *info);

/**
 * Returns a plugin's license.
 *
 * @param info The plugin's info instance.
 *
 * @return The license of the plugin, or @c NULL.
 */
const gchar *purple_plugin_info_get_license(const PurplePluginInfo *info);

/**
 * Returns the required ABI version for a plugin.
 *
 * @param info The plugin's info instance.
 *
 * @return The required ABI version for the plugin, or @c NULL.
 */
guint32 purple_plugin_info_get_abi_version(const PurplePluginInfo *info);

/**
 * Returns a list of actions that a plugin can perform.
 *
 * @param info The plugin info to get the actions from.
 *
 * @constreturn A list of #PurplePluginAction instances corresponding to the
 *              actions a plugin can perform.
 *
 * @see purple_plugin_add_action()
 */
GList *purple_plugin_info_get_actions(const PurplePluginInfo *info);

/**
 * Returns whether or not a plugin is loadable.
 *
 * If this returns @c FALSE, the plugin is guaranteed to not
 * be loadable. However, a return value of @c TRUE does not
 * guarantee the plugin is loadable.
 * An error is set if the plugin is not loadable.
 *
 * @param info The plugin info of the plugin.
 *
 * @return @c TRUE if the plugin may be loadable, @c FALSE if the plugin is not
 *         loadable.
 *
 * @see purple_plugin_info_get_error()
 */
gboolean purple_plugin_info_is_loadable(const PurplePluginInfo *info);

/**
 * If a plugin is not loadable, this returns the reason.
 *
 * @param info The plugin info of the plugin.
 *
 * @return The reason why the plugin is not loadable.
 */
gchar *purple_plugin_info_get_error(const PurplePluginInfo *info);

/**
 * Returns a list of plugins that a particular plugin depends on.
 *
 * @param info The plugin's info instance.
 *
 * @constreturn The list of dependencies of a plugin.
 */
GSList *purple_plugin_info_get_dependencies(const PurplePluginInfo *info);

/**
 * Returns a list of plugins that depend on a particular plugin.
 *
 * @param info The plugin info of the plugin whos dependent plugins are needed.
 *
 * @constreturn The list of a plugins that depend on the specified plugin.
 */
GSList *purple_plugin_info_get_dependent_plugins(const PurplePluginInfo *info);

/**
 * Sets a callback to be invoked to retrieve the preferences frame for a plugin.
 *
 * @param info The plugin info to set the callback for.
 * @param callback    The callback that returns the preferences frame.
 */
void purple_plugin_info_set_pref_frame_callback(PurplePluginInfo *info,
		PurplePluginPrefFrameCallback callback);

/**
 * Returns the callback that retrieves the preferences frame for a plugin.
 *
 * @param info The plugin info to get the callback from.
 *
 * @return The callback that returns the preferences frame.
 */
PurplePluginPrefFrameCallback
purple_plugin_info_get_pref_frame_callback(const PurplePluginInfo *info);

/*@}*/

/**************************************************************************/
/** @name PluginAction API                                                */
/**************************************************************************/
/*@{*/

/**
 * Returns the GType for the PurplePluginAction boxed structure.
 */
GType purple_plugin_action_get_type(void);

/*@}*/

/**************************************************************************/
/** @name Plugins API                                                     */
/**************************************************************************/
/*@{*/

/**
 * Returns a list of all plugins, whether loaded or not.
 *
 * @return A list of all plugins.
 */
GList *purple_plugins_find_all(void);

/**
 * Returns a list of all loaded plugins.
 *
 * @constreturn A list of all loaded plugins.
 */
GList *purple_plugins_get_loaded(void);

/**
 * Add a new directory to search for plugins
 *
 * @param path The new search path.
 */
void purple_plugins_add_search_path(const gchar *path);

/**
 * Forces a refresh of all plugins found in the search paths.
 *
 * @see purple_plugins_add_search_path()
 */
void purple_plugins_refresh(void);

/**
 * Finds a plugin with the specified plugin ID.
 *
 * @param id The plugin ID.
 *
 * @return The plugin if found, or @c NULL if not found.
 */
PurplePlugin *purple_plugins_find_plugin(const gchar *id);

/**
 * Finds a plugin with the specified filename (filename with a path).
 *
 * @param filename The plugin filename.
 *
 * @return The plugin if found, or @c NULL if not found.
 */
PurplePlugin *purple_plugins_find_by_filename(const char *filename);

/**
 * Saves the list of loaded plugins to the specified preference key
 *
 * @param key The preference key to save the list of plugins to.
 */
void purple_plugins_save_loaded(const char *key);

/**
 * Attempts to load all the plugins in the specified preference key
 * that were loaded when purple last quit.
 *
 * @param key The preference key containing the list of plugins.
 */
void purple_plugins_load_saved(const char *key);

/**
 * Unloads all loaded plugins.
 */
void purple_plugins_unload_all(void);

/*@}*/

/**************************************************************************/
/** @name Plugins Subsystem API                                           */
/**************************************************************************/
/*@{*/

/**
 * Returns the plugin subsystem handle.
 *
 * @return The plugin sybsystem handle.
 */
void *purple_plugins_get_handle(void);

/**
 * Initializes the plugin subsystem
 */
void purple_plugins_init(void);

/**
 * Uninitializes the plugin subsystem
 */
void purple_plugins_uninit(void);

/*@}*/

G_END_DECLS

#endif /* _PURPLE_PLUGINS_H_ */