/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 * \brief CallerID (and other GR30) management and generation
 * Includes code and algorithms from the Zapata library.
 *
 * \ref CID
 *
 */

/*!
 * \page CID Caller ID names and numbers
 *
 * Caller ID names are currently 8 bit characters, propably
 * ISO8859-1, depending on what your channel drivers handle.
 *
 * IAX2 and SIP caller ID names are UTF8
 * On ISDN Caller ID names are 7 bit, Almost ASCII
 * (See http://www.zytrax.com/tech/ia5.html )
 *
 * \note Asterisk does not currently support SIP utf8 caller ID names or caller ID's.
 *
 * \par See also
 * 	\arg \ref callerid.c
 * 	\arg \ref callerid.h
 *	\arg \ref Def_CallerPres
 */

#ifndef _ASTERISK_CALLERID_H
#define _ASTERISK_CALLERID_H

#include "asterisk/format.h"

#define MAX_CALLERID_SIZE 32000

#define CID_PRIVATE_NAME 		(1 << 0)
#define CID_PRIVATE_NUMBER		(1 << 1)
#define CID_UNKNOWN_NAME		(1 << 2)
#define CID_UNKNOWN_NUMBER		(1 << 3)
#define CID_MSGWAITING			(1 << 4)
#define CID_NOMSGWAITING		(1 << 5)

#define CID_SIG_BELL	1
#define CID_SIG_V23	2
#define CID_SIG_DTMF	3
#define CID_SIG_V23_JP	4
#define CID_SIG_SMDI	5

#define CID_START_RING			1
#define CID_START_POLARITY 		2
#define CID_START_POLARITY_IN 	3
#define CID_START_DTMF_NOALERT	4

/* defines dealing with message waiting indication generation */
/*! MWI SDMF format */
#define CID_MWI_TYPE_SDMF		0x00
/*! MWI MDMF format -- generate only MWI field */
#define CID_MWI_TYPE_MDMF		0x01
/*! MWI MDMF format -- generate name, callerid, date and MWI fields */
#define CID_MWI_TYPE_MDMF_FULL	0x02

#define AST_LIN2X(a) ((ast_format_cmp(codec, ast_format_alaw) == AST_FORMAT_CMP_EQUAL) ? (AST_LIN2A(a)) : (AST_LIN2MU(a)))
#define AST_XLAW(a) ((ast_format_cmp(codec, ast_format_alaw) == AST_FORMAT_CMP_EQUAL) ? (AST_ALAW(a)) : (AST_MULAW(a)))


struct callerid_state;
typedef struct callerid_state CIDSTATE;

/*! \brief CallerID Initialization
 * \par
 * Initializes the callerid system.  Mostly stuff for inverse FFT
 */
void callerid_init(void);

/*! \brief Generates a CallerID FSK stream in ulaw format suitable for transmission.
 * \param buf Buffer to use. If "buf" is supplied, it will use that buffer instead of allocating its own.
 *   "buf" must be at least 32000 bytes in size of you want to be sure you don't have an overrun.
 * \param number Use NULL for no number or "P" for "private"
 * \param name name to be used
 * \param flags passed flags
 * \param callwaiting callwaiting flag
 * \param codec -- either AST_FORMAT_ULAW or AST_FORMAT_ALAW
 * \details
 * This function creates a stream of callerid (a callerid spill) data in ulaw format.
 * \return It returns the size
 * (in bytes) of the data (if it returns a size of 0, there is probably an error)
 */
int callerid_generate(unsigned char *buf, const char *number, const char *name, int flags, int callwaiting, struct ast_format *codec);

/*! \brief Create a callerID state machine
 * \param cid_signalling Type of signalling in use
 *
 * \details
 * This function returns a malloc'd instance of the callerid_state data structure.
 * \return Returns a pointer to a malloc'd callerid_state structure, or NULL on error.
 */
struct callerid_state *callerid_new(int cid_signalling);

/*! \brief Read samples into the state machine.
 * \param cid Which state machine to act upon
 * \param ubuf containing your samples
 * \param samples number of samples contained within the buffer.
 * \param codec which codec (AST_FORMAT_ALAW or AST_FORMAT_ULAW)
 *
 * \details
 * Send received audio to the Caller*ID demodulator.
 * \retval -1 on error
 * \retval 0 for "needs more samples"
 * \retval 1 if the CallerID spill reception is complete.
 */
int callerid_feed(struct callerid_state *cid, unsigned char *ubuf, int samples, struct ast_format *codec);

/*! \brief Read samples into the state machine.
 * \param cid Which state machine to act upon
 * \param ubuf containing your samples
 * \param samples number of samples contained within the buffer.
 * \param codec which codec (AST_FORMAT_ALAW or AST_FORMAT_ULAW)
 *
 * \details
 * Send received audio to the Caller*ID demodulator (for japanese style lines).
 * \retval -1 on error
 * \retval 0 for "needs more samples"
 * \retval 1 if the CallerID spill reception is complete.
 */
int callerid_feed_jp(struct callerid_state *cid, unsigned char *ubuf, int samples, struct ast_format *codec);

/*! \brief Extract info out of callerID state machine.  Flags are listed above
 * \param cid Callerid state machine to act upon
 * \param number Pass the address of a pointer-to-char (will contain the phone number)
 * \param name Pass the address of a pointer-to-char (will contain the name)
 * \param flags Pass the address of an int variable(will contain the various callerid flags)
 *
 * \details
 * This function extracts a callerid string out of a callerid_state state machine.
 * If no number is found, *number will be set to NULL.  Likewise for the name.
 * Flags can contain any of the following:
 *
 * \return Returns nothing.
 */
void callerid_get(struct callerid_state *cid, char **number, char **name, int *flags);

/*!
 * \brief Get and parse DTMF-based callerid
 * \param cidstring The actual transmitted string.
 * \param number The cid number is returned here.
 * \param flags The cid flags are returned here.
 */
void callerid_get_dtmf(char *cidstring, char *number, int *flags);

/*! \brief This function frees callerid_state cid.
 * \param cid This is the callerid_state state machine to free
 */
void callerid_free(struct callerid_state *cid);

/*! \brief Generate Caller-ID spill from the "callerid" field of asterisk (in e-mail address like format)
 * \param buf buffer for output samples. See callerid_generate() for details regarding buffer.
 * \param name Caller-ID Name
 * \param number Caller-ID Number
 * \param codec Asterisk codec (either AST_FORMAT_ALAW or AST_FORMAT_ULAW)
 *
 * \details
 * Acts like callerid_generate except uses an asterisk format callerid string.
 */
int ast_callerid_generate(unsigned char *buf, const char *name, const char *number, struct ast_format *codec);

/*!
 * \brief Generate message waiting indicator
 * \param buf
 * \param active The message indicator state
 *  -- either 0 no messages in mailbox or 1 messages in mailbox
 * \param type Format of message (any of CID_MWI_TYPE_*)
 * \param codec
 * \param name
 * \param number
 * \param flags
 * \see callerid_generate() for more info as it uses the same encoding
 * \version 1.6.1 changed mdmf parameter to type, added name, number and flags for caller id message generation
 */
int ast_callerid_vmwi_generate(unsigned char *buf, int active, int type, struct ast_format *codec, const char *name,
	const char *number, int flags);

/*! \brief Generate Caller-ID spill but in a format suitable for Call Waiting(tm)'s Caller*ID(tm)
 * \see ast_callerid_generate() for other details
 */
int ast_callerid_callwaiting_generate(unsigned char *buf, const char *name, const char *number, struct ast_format *codec);

/*! \brief Destructively parse inbuf into name and location (or number)
 * \details
 * Parses callerid stream from inbuf and changes into useable form, outputed in name and location.
 * \param instr buffer of callerid stream (in audio form) to be parsed. Warning, data in buffer is changed.
 * \param name address of a pointer-to-char for the name value of the stream.
 * \param location address of a pointer-to-char for the phone number value of the stream.
 * \note XXX 'name' is not parsed consistently e.g. we have
 * input                   location        name
 * " foo bar " <123>       123             ' foo bar ' (with spaces around)
 * " foo bar "             NULL            'foo bar' (without spaces around)
 * The parsing of leading and trailing space/quotes should be more consistent.
 * \return Returns 0 on success, -1 on failure.
 */
int ast_callerid_parse(char *instr, char **name, char **location);

/*!
 * \brief Generate a CAS (CPE Alert Signal) tone for 'n' samples
 * \param outbuf Allocated buffer for data.  Must be at least 2400 bytes unless no SAS is desired
 * \param sas Non-zero if CAS should be preceeded by SAS
 * \param len How many samples to generate.
 * \param codec Which codec (AST_FORMAT_ALAW or AST_FORMAT_ULAW)
 * \return Returns -1 on error (if len is less than 2400), 0 on success.
 */
int ast_gen_cas(unsigned char *outbuf, int sas, int len, struct ast_format *codec);

/*!
 * \brief Shrink a phone number in place to just digits (more accurately it just removes ()'s, .'s, and -'s...
 * \param n The number to be stripped/shrunk
 * \return Returns nothing important
 */
void ast_shrink_phone_number(char *n);

/*!
 * \brief Check if a string consists only of digits and + \#
 * \param n number to be checked.
 * \return Returns 0 if n is a number, 1 if it's not.
 */
int ast_isphonenumber(const char *n);

/*!
 * \brief Check if a string consists only of digits and + \# ( ) - .
 * (meaning it can be cleaned with ast_shrink_phone_number)
 * \param exten The extension (or URI) to be checked.
 * \retval 1 if string is valid AST shrinkable phone number
 * \retval 0 if not
 */
int ast_is_shrinkable_phonenumber(const char *exten);

int ast_callerid_split(const char *src, char *name, int namelen, char *num, int numlen);

char *ast_callerid_merge(char *buf, int bufsiz, const char *name, const char *num, const char *unknown);

/*
 * Caller*ID and other GR-30 compatible generation
 * routines (used by ADSI for example)
 */

extern float cid_dr[4];
extern float cid_di[4];
extern float clidsb;

static inline float callerid_getcarrier(float *cr, float *ci, int bit)
{
	/* Move along.  There's nothing to see here... */
	float t;
	t = *cr * cid_dr[bit] - *ci * cid_di[bit];
	*ci = *cr * cid_di[bit] + *ci * cid_dr[bit];
	*cr = t;

	t = 2.0 - (*cr * *cr + *ci * *ci);
	*cr *= t;
	*ci *= t;
	return *cr;
}

#define PUT_BYTE(a) do { \
	*(buf++) = (a); \
	bytes++; \
} while(0)

#define PUT_AUDIO_SAMPLE(y) do { \
	int __sample_idx = (short)(rint(8192.0 * (y))); \
	*(buf++) = AST_LIN2X(__sample_idx); \
	bytes++; \
} while(0)

#define PUT_CLID_MARKMS do { \
	int __clid_x; \
	for (__clid_x=0;__clid_x<8;__clid_x++) \
		PUT_AUDIO_SAMPLE(callerid_getcarrier(&cr, &ci, 1)); \
} while(0)

#define PUT_CLID_BAUD(bit) do { \
	while(scont < clidsb) { \
		PUT_AUDIO_SAMPLE(callerid_getcarrier(&cr, &ci, bit)); \
		scont += 1.0; \
	} \
	scont -= clidsb; \
} while(0)


#define PUT_CLID(byte) do { \
	int z; \
	unsigned char b = (byte); \
	PUT_CLID_BAUD(0); 	/* Start bit */ \
	for (z=0;z<8;z++) { \
		PUT_CLID_BAUD(b & 1); \
		b >>= 1; \
	} \
	PUT_CLID_BAUD(1);	/* Stop bit */ \
} while(0)

/* Various defines and bits for handling PRI- and SS7-type restriction */

#define AST_PRES_NUMBER_TYPE					0x03
#define AST_PRES_USER_NUMBER_UNSCREENED			0x00
#define AST_PRES_USER_NUMBER_PASSED_SCREEN		0x01
#define AST_PRES_USER_NUMBER_FAILED_SCREEN		0x02
#define AST_PRES_NETWORK_NUMBER					0x03

#define AST_PRES_RESTRICTION					0x60
#define AST_PRES_ALLOWED						0x00
#define AST_PRES_RESTRICTED						0x20
#define AST_PRES_UNAVAILABLE					0x40
#define AST_PRES_RESERVED						0x60

#define AST_PRES_ALLOWED_USER_NUMBER_NOT_SCREENED \
	(AST_PRES_ALLOWED | AST_PRES_USER_NUMBER_UNSCREENED)

#define AST_PRES_ALLOWED_USER_NUMBER_PASSED_SCREEN \
	(AST_PRES_ALLOWED | AST_PRES_USER_NUMBER_PASSED_SCREEN)

#define AST_PRES_ALLOWED_USER_NUMBER_FAILED_SCREEN \
	(AST_PRES_ALLOWED | AST_PRES_USER_NUMBER_FAILED_SCREEN)

#define AST_PRES_ALLOWED_NETWORK_NUMBER	\
	(AST_PRES_ALLOWED | AST_PRES_NETWORK_NUMBER)

#define AST_PRES_PROHIB_USER_NUMBER_NOT_SCREENED \
	(AST_PRES_RESTRICTED | AST_PRES_USER_NUMBER_UNSCREENED)

#define AST_PRES_PROHIB_USER_NUMBER_PASSED_SCREEN \
	(AST_PRES_RESTRICTED | AST_PRES_USER_NUMBER_PASSED_SCREEN)

#define AST_PRES_PROHIB_USER_NUMBER_FAILED_SCREEN \
	(AST_PRES_RESTRICTED | AST_PRES_USER_NUMBER_FAILED_SCREEN)

#define AST_PRES_PROHIB_NETWORK_NUMBER \
	(AST_PRES_RESTRICTED | AST_PRES_NETWORK_NUMBER)

#define AST_PRES_NUMBER_NOT_AVAILABLE \
	(AST_PRES_UNAVAILABLE | AST_PRES_NETWORK_NUMBER)

int ast_parse_caller_presentation(const char *data);
const char *ast_describe_caller_presentation(int data);
const char *ast_named_caller_presentation(int data);

/*!
 * \page Def_CallerPres Caller ID Presentation
 *
 * Caller ID presentation values are used to set properties to a
 * caller ID in PSTN networks, and as RPID value in SIP transactions.
 *
 * The following values are available to use:
 * \arg \b Defined value, text string in config file, explanation
 *
 * \arg \b AST_PRES_ALLOWED_USER_NUMBER_NOT_SCREENED, "allowed_not_screened", Presentation Allowed, Not Screened,
 * \arg \b AST_PRES_ALLOWED_USER_NUMBER_PASSED_SCREEN, "allowed_passed_screen", Presentation Allowed, Passed Screen,
 * \arg \b AST_PRES_ALLOWED_USER_NUMBER_FAILED_SCREEN, "allowed_failed_screen", Presentation Allowed, Failed Screen,
 * \arg \b AST_PRES_ALLOWED_NETWORK_NUMBER, "allowed", Presentation Allowed, Network Number,
 * \arg \b AST_PRES_PROHIB_USER_NUMBER_NOT_SCREENED, "prohib_not_screened", Presentation Prohibited, Not Screened,
 * \arg \b AST_PRES_PROHIB_USER_NUMBER_PASSED_SCREEN, "prohib_passed_screen", Presentation Prohibited, Passed Screen,
 * \arg \b AST_PRES_PROHIB_USER_NUMBER_FAILED_SCREEN, "prohib_failed_screen", Presentation Prohibited, Failed Screen,
 * \arg \b AST_PRES_PROHIB_NETWORK_NUMBER, "prohib", Presentation Prohibited, Network Number,
 *
 * \par References
 * \arg \ref callerid.h Definitions
 * \arg \ref callerid.c Functions
 * \arg \ref CID Caller ID names and numbers
 */

/*!
 * \brief redirecting reason codes.
 *
 * This list attempts to encompass redirecting reasons
 * as defined by several channel technologies.
 */
enum AST_REDIRECTING_REASON {
	AST_REDIRECTING_REASON_UNKNOWN,
	AST_REDIRECTING_REASON_USER_BUSY,
	AST_REDIRECTING_REASON_NO_ANSWER,
	AST_REDIRECTING_REASON_UNAVAILABLE,
	AST_REDIRECTING_REASON_UNCONDITIONAL,
	AST_REDIRECTING_REASON_TIME_OF_DAY,
	AST_REDIRECTING_REASON_DO_NOT_DISTURB,
	AST_REDIRECTING_REASON_DEFLECTION,
	AST_REDIRECTING_REASON_FOLLOW_ME,
	AST_REDIRECTING_REASON_OUT_OF_ORDER,
	AST_REDIRECTING_REASON_AWAY,
	AST_REDIRECTING_REASON_CALL_FWD_DTE,           /* This is something defined in Q.931, and no I don't know what it means */
	AST_REDIRECTING_REASON_SEND_TO_VM,
};

/*!
 * \since 1.8
 * \brief Convert redirecting reason text code to value (used in config file parsing)
 *
 * \param data text string from config file
 *
 * \retval Q931_REDIRECTING_REASON from callerid.h
 * \retval -1 if not in table
 */
int ast_redirecting_reason_parse(const char *data);

/*!
 * \since 1.8
 * \brief Convert redirecting reason value to explanatory string
 *
 * \param data Q931_REDIRECTING_REASON from callerid.h
 *
 * \return string for human presentation
 */
const char *ast_redirecting_reason_describe(int data);

struct ast_party_redirecting_reason;

/*!
 * \since 1.8
 * \brief Convert redirecting reason value to text code
 *
 * \param data ast_party_redirecting_reason structure from channel.h
 *
 * \return string for config file
 */
const char *ast_redirecting_reason_name(const struct ast_party_redirecting_reason *data);

/*!
 * \brief Connected line update source code
 */
enum AST_CONNECTED_LINE_UPDATE_SOURCE {
	/*! Update for unknown reason (May be interpreted to mean from answer) */
	AST_CONNECTED_LINE_UPDATE_SOURCE_UNKNOWN,
	/*! Update from normal call answering */
	AST_CONNECTED_LINE_UPDATE_SOURCE_ANSWER,
	/*! Update from call diversion (Deprecated, use REDIRECTING updates instead.) */
	AST_CONNECTED_LINE_UPDATE_SOURCE_DIVERSION,
	/*! Update from call transfer(active) (Party has already answered) */
	AST_CONNECTED_LINE_UPDATE_SOURCE_TRANSFER,
	/*! Update from call transfer(alerting) (Party has not answered yet) */
	AST_CONNECTED_LINE_UPDATE_SOURCE_TRANSFER_ALERTING
};

/*!
 * \since 1.8
 * \brief Convert connected line update source text code to value (used in config file parsing)
 *
 * \param data text string from config file
 *
 * \retval AST_CONNECTED_LINE_UPDATE_SOURCE from callerid.h
 * \retval -1 if not in table
 */
int ast_connected_line_source_parse(const char *data);

/*!
 * \since 1.8
 * \brief Convert connected line update source value to explanatory string
 *
 * \param data AST_CONNECTED_LINE_UPDATE_SOURCE from callerid.h
 *
 * \return string for human presentation
 */
const char *ast_connected_line_source_describe(int data);

/*!
 * \since 1.8
 * \brief Convert connected line update source value to text code
 *
 * \param data AST_CONNECTED_LINE_UPDATE_SOURCE from callerid.h
 *
 * \return string for config file
 */
const char *ast_connected_line_source_name(int data);

/*!
 * \since 1.8
 * \brief Convert ast_party_name.char_set text code to value (used in config file parsing)
 *
 * \param data text string from config file
 *
 * \retval AST_PARTY_CHAR_SET from channel.h
 * \retval -1 if not in table
 */
int ast_party_name_charset_parse(const char *data);

/*!
 * \since 1.8
 * \brief Convert ast_party_name.char_set value to explanatory string
 *
 * \param data AST_PARTY_CHAR_SET from channel.h
 *
 * \return string for human presentation
 */
const char *ast_party_name_charset_describe(int data);

/*!
 * \since 1.8
 * \brief Convert ast_party_name.char_set value to text code
 *
 * \param data AST_PARTY_CHAR_SET from channel.h
 *
 * \return string for config file
 */
const char *ast_party_name_charset_str(int data);


#endif /* _ASTERISK_CALLERID_H */
