/*
 * Asterisk -- A telephony toolkit for Linux.
 *
 * Core PBX routines and definitions.
 * 
 * Copyright (C) 1999, Mark Spencer
 *
 * Mark Spencer <markster@linux-support.net>
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License
 */
#ifndef _ASTERISK_PBX_H
#define _ASTERISK_PBX_H

#include <asterisk/sched.h>
#include <asterisk/channel.h>

#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif

#define AST_PBX_KEEP    0
#define AST_PBX_REPLACE 1

//! Max length of an application
#define AST_MAX_APP	32

//! Special return values from applications to the PBX
#define AST_PBX_KEEPALIVE	10		/* Destroy the thread, but don't hang up the channel */

struct ast_context;
struct ast_exten;     
struct ast_include;
struct ast_ignorepat;
struct ast_sw;

//! Data structure associated with an asterisk switch
struct ast_switch {
	/*! NULL */
	struct ast_switch *next;	
	/*! Name of the switch */
	char *name;				
	/*! Description of the switch */
	char *description;		
	
	int (*exists)(struct ast_channel *chan, char *context, char *exten, int priority, char *callerid, char *data);
	
	int (*canmatch)(struct ast_channel *chan, char *context, char *exten, int priority, char *callerid, char *data);
	
	int (*exec)(struct ast_channel *chan, char *context, char *exten, int priority, char *callerid, int newstack, char *data);
};

//! Register an alternative switch
/*!
 * \param sw switch to register
 * This function registers a populated ast_switch structure with the
 * asterisk switching architecture.
 * It returns 0 on success, and other than 0 on failure
 */
extern int ast_register_switch(struct ast_switch *sw);

//! Unregister an alternative switch
/*!
 * \param sw switch to unregister
 * Unregisters a switch from asterisk.
 * Returns nothing
 */
extern void ast_unregister_switch(struct ast_switch *sw);

//! Look up an application
/*!
 * \param app name of the app
 * This function searches for the ast_app structure within
 * the apps that are registered for the one with the name
 * you passed in.
 * Returns the ast_app structure that matches on success, or NULL on failure
 */
extern struct ast_app *pbx_findapp(char *app);

//! executes an application
/*!
 * \param c channel to execute on
 * \param app which app to execute
 * \param data the data passed into the app
 * \param newstack stack pointer
 * This application executes an application on a given channel.  It
 * saves the stack and executes the given appliation passing in
 * the given data.
 * It returns 0 on success, and -1 on failure
 */
int pbx_exec(struct ast_channel *c, struct ast_app *app, void *data, int newstack);

//! Register a new context
/*!
 * \param name name of the new context
 * \param registrar registrar of the context
 * This will first search for a context with your name.  If it exists already, it will not
 * create a new one.  If it does not exist, it will create a new one with the given name
 * and registrar.
 * It returns NULL on failure, and an ast_context structure on success
 */
struct ast_context *ast_context_create(char *name, char *registrar);

//! Destroy a context (matches the specified context (or ANY context if NULL)
/*!
 * \param con context to destroy
 * \param registrar who registered it
 * You can optionally leave out either parameter.  It will find it
 * based on either the ast_context or the registrar name.
 * Returns nothing
 */
void ast_context_destroy(struct ast_context *con, char *registrar);

//! Find a context
/*!
 * \param name name of the context to find
 * Will search for the context with the given name.
 * Returns the ast_context on success, NULL on failure.
 */
struct ast_context *ast_context_find(char *name);

//! Create a new thread and start the PBX (or whatever)
/*!
 * \param c channel to start the pbx on
 * Starts a pbx thread on a given channel
 * It returns -1 on failure, and 0 on success
 */
int ast_pbx_start(struct ast_channel *c);

//! Execute the PBX in the current thread
/*!
 * \param c channel to run the pbx on
 * This executes the PBX on a given channel.  It allocates a new
 * PBX structure for the channel, and provides all PBX functionality.
 */
int ast_pbx_run(struct ast_channel *c);

/*! 
 * \param context context to add the extension to
 * \param replace
 * \param extension extension to add
 * \param priority priority level of extension addition
 * \param callerid callerid of extension
 * \param application application to run on the extension with that priority level
 * \param data data to pass to the application
 * \param datad
 * \param registrar who registered the extension
 * Add and extension to an extension context.  
 * Callerid is a pattern to match CallerID, or NULL to match any callerid
 * Returns 0 on success, -1 on failure
 */
int ast_add_extension(char *context, int replace, char *extension, int priority, char *callerid,
	char *application, void *data, void (*datad)(void *), char *registrar);

//! Add an extension to an extension context, this time with an ast_context *.  CallerID is a pattern to match on callerid, or NULL to not care about callerid
/*! 
 * For details about the arguements, check ast_add_extension()
 */
int ast_add_extension2(struct ast_context *con,
				      int replace, char *extension, int priority, char *callerid, 
					  char *application, void *data, void (*datad)(void *),
					  char *registrar);

//! Add an application.  The function 'execute' should return non-zero if the line needs to be hung up. 
/*!
  \param app Short name of the application
  \param execute a function callback to execute the application
  \param synopsis a short description of the application
  \param description long description of the application
   Include a one-line synopsis (e.g. 'hangs up a channel') and a more lengthy, multiline
   description with more detail, including under what conditions the application
   will return 0 or -1.
   This registers an application with asterisks internal application list.  Please note:
   The individual applications themselves are responsible for registering and unregistering
   CLI commands.
   It returns 0 on success, -1 on failure.
*/
int ast_register_application(char *app, int (*execute)(struct ast_channel *, void *),
			     char *synopsis, char *description);

//! Remove an application
/*!
 * \param app name of the application (does not have to be the same string as the one that was registered)
 * This unregisters an application from asterisk's internal registration mechanisms.
 * It returns 0 on success, and -1 on failure.
 */
int ast_unregister_application(char *app);

//! If an extension exists, return non-zero
// work
/*!
 * \param c this is not important
 * \param context which context to look in
 * \param exten which extension to search for
 * \param priority priority of the action within the extension
 * \param callerid callerid to search for
 * If an extension within the given context(or callerid) with the given priority is found a non zero value will be returned.
 * Otherwise, 0 is returned.
 */
int ast_exists_extension(struct ast_channel *c, char *context, char *exten, int priority, char *callerid);

//! Looks for a valid matching extension
/*!
  \param c not really important
  \param context context to serach within
  \param exten extension to check
  \param priority priority of extension path
  \param callerid callerid of extension being searched for
   If "exten" *could be* a valid extension in this context with or without
   some more digits, return non-zero.  Basically, when this returns 0, no matter
   what you add to exten, it's not going to be a valid extension anymore
*/
int ast_canmatch_extension(struct ast_channel *c, char *context, char *exten, int priority, char *callerid);

//! Determine if a given extension matches a given pattern (in NXX format)
/*!
 * \param pattern pattern to match
 * \param extension extension to check against the pattern.
 * Checks whether or not the given extension matches the given pattern.
 * Returns 1 on match, 0 on failure
 */
int ast_extension_match(char *pattern, char *extension);

//! Launch a new extension (i.e. new stack)
/*!
 * \param c not important
 * \param context which context to generate the extension within
 * \param exten new extension to add
 * \param priority priority of new extension
 * \param callerid callerid of extension
 * This adds a new extension to the asterisk extension list.
 * It returns 0 on success, -1 on failure.
 */
int ast_spawn_extension(struct ast_channel *c, char *context, char *exten, int priority, char *callerid);

//! Execute an extension.
/*!
  \param c channel to execute upon
  \param context which context extension is in
  \param exten extension to execute
  \param priority priority to execute within the given extension
   If it's not available, do whatever you should do for
   default extensions and halt the thread if necessary.  This function does not
   return, except on error.
*/
int ast_exec_extension(struct ast_channel *c, char *context, char *exten, int priority, char *callerid);

//! Add an include
/*!
  \param context context to add include to
  \param include new include to add
  \param registrar who's registering it
   Adds an include taking a char * string as the context parameter
   Returns 0 on success, -1 on error
*/
int ast_context_add_include(char *context, char *include, char *registrar);

//! Add an include
/*!
  \param con context to add the include to
  \param include include to add
  \param registrar who registered the context
   Adds an include taking a struct ast_context as the first parameter
   Returns 0 on success, -1 on failure
*/
int ast_context_add_include2(struct ast_context *con, char *include, char *registrar);

//! Removes an include
/*!
 * See add_include
 */
int ast_context_remove_include(char *context, char *include, char *registrar);
//! Removes an include by an ast_context structure
/*!
 * See add_include2
 */
int ast_context_remove_include2(struct ast_context *con, char *include, char *registrar);

//! Add a switch
/*!
 * \param context context to which to add the switch
 * \param sw switch to add
 * \param data data to pass to switch
 * \param registrar whoever registered the switch
 * This function registers a switch with the asterisk switch architecture
 * It returns 0 on success, -1 on failure
 */
int ast_context_add_switch(char *context, char *sw, char *data, char *registrar);
//! Adds a switch (first param is a ast_context)
/*!
 * See ast_context_add_switch()
 */
int ast_context_add_switch2(struct ast_context *con, char *sw, char *data, char *registrar);

//! Remove a switch
/*!
 * Removes a switch with the given parameters
 * Returns 0 on success, -1 on failure
 */
int ast_context_remove_switch(char *context, char *sw, char *data, char *registrar);
int ast_context_remove_switch2(struct ast_context *con, char *sw, char *data, char *registrar);

//! Simply remove extension from context
/*!
 * \param context context to remove extension from
 * \param extension which extension to remove
 * \param priority priority of extension to remove
 * \param registrar registrar of the extension
 * This function removes an extension from a given context.
 * Returns 0 on success, -1 on failure
 */
int ast_context_remove_extension(char *context, char *extension, int priority,
	char *registrar);
int ast_context_remove_extension2(struct ast_context *con, char *extension,
	int priority, char *registrar);

//! Add an ignorepat
/*!
 * \param context which context to add the ignorpattern to
 * \param ignorpat ignorepattern to set up for the extension
 * \param registrar registrar of the ignore pattern
 * Adds an ignore pattern to a particular context.
 * Returns 0 on success, -1 on failure
 */
int ast_context_add_ignorepat(char *context, char *ignorepat, char *registrar);
int ast_context_add_ignorepat2(struct ast_context *con, char *ignorepat, char *registrar);

/* Remove an ignorepat */
/*!
 * \param context context from which to remove the pattern
 * \param ignorepat the pattern to remove
 * \param registrar the registrar of the ignore pattern
 * This removes the given ignorepattern
 * Returns 0 on success, -1 on failure
 */
int ast_context_remove_ignorepat(char *context, char *ignorepat, char *registrar);
int ast_context_remove_ignorepat2(struct ast_context *con, char *ignorepat, char *registrar);

//! Checks to see if a number should be ignored
/*!
 * \param context context to search within
 * \param extension to check whether it should be ignored or not
 * Check if a number should be ignored with respect to dialtone cancellation.  
 * Returns 0 if the pattern should not be ignored, or non-zero if the pattern should be ignored 
 */
int ast_ignore_pattern(char *context, char *pattern);

/* Locking functions for outer modules, especially for completion functions */
//! Locks the contexts
/*! Locks the context list
 * Returns 0 on success, -1 on error
 */
int ast_lock_contexts(void);

//! Unlocks contexts
/*!
 * Returns 0 on success, -1 on failure
 */
int ast_unlock_contexts(void);

//! Locks a given context
/*!
 * \param con context to lock
 * Locks the context.
 * Returns 0 on success, -1 on failure
 */
int ast_lock_context(struct ast_context *con);
//! Unlocks the given context
/*!
 * \param con context to unlock
 * Unlocks the given context
 * Returns 0 on success, -1 on failure
 */
int ast_unlock_context(struct ast_context *con);

/* Functions for returning values from structures */
char *ast_get_context_name(struct ast_context *con);
char *ast_get_extension_name(struct ast_exten *exten);
char *ast_get_include_name(struct ast_include *include);
char *ast_get_ignorepat_name(struct ast_ignorepat *ip);
char *ast_get_switch_name(struct ast_sw *sw);
char *ast_get_switch_data(struct ast_sw *sw);

/* Other extension stuff */
int ast_get_extension_priority(struct ast_exten *exten);
char *ast_get_extension_app(struct ast_exten *e);
void *ast_get_extension_app_data(struct ast_exten *e);

/* Registrar info functions ... */
char *ast_get_context_registrar(struct ast_context *c);
char *ast_get_extension_registrar(struct ast_exten *e);
char *ast_get_include_registrar(struct ast_include *i);
char *ast_get_ignorepat_registrar(struct ast_ignorepat *ip);
char *ast_get_switch_registrar(struct ast_sw *sw);

/* Walking functions ... */
struct ast_context *ast_walk_contexts(struct ast_context *con);
struct ast_exten *ast_walk_context_extensions(struct ast_context *con,
	struct ast_exten *priority);
struct ast_exten *ast_walk_extension_priorities(struct ast_exten *exten,
	struct ast_exten *priority);
struct ast_include *ast_walk_context_includes(struct ast_context *con,
	struct ast_include *inc);
struct ast_ignorepat *ast_walk_context_ignorepats(struct ast_context *con,
	struct ast_ignorepat *ip);
struct ast_sw *ast_walk_context_switches(struct ast_context *con, struct ast_sw *sw);
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif


#endif