/* 
 * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
 * Copyright (C) 2005-2014, Anthony Minessale II <anthm@freeswitch.org>
 *
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
 *
 * The Initial Developer of the Original Code is
 * Anthony Minessale II <anthm@freeswitch.org>
 * Portions created by the Initial Developer are Copyright (C)
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * 
 * Marc Olivier Chouinard <mochouinard@moctel.com>
 *
 *
 * ivr.c -- VoiceMail IVR Engone
 *
 */

#include <switch.h>

#include "ivr.h"

static int match_dtmf(switch_core_session_t *session, ivre_data_t *loc) {
	switch_bool_t is_invalid[128] = { SWITCH_FALSE };
	int i;
	loc->potentialMatch = NULL;
	loc->completeMatch = NULL;
	loc->potentialMatchCount = 0;

	for (i = 0; i < 16 && i < loc->dtmf_received; i++) {
		int j;
		loc->potentialMatchCount = 0;
		for (j = 0; j < 128 && !zstr(loc->dtmf_accepted[j]); j++) {
			switch_bool_t cMatch = SWITCH_FALSE;
			char test[2] = { 0 };

			if (is_invalid[j])
				continue;

			test[0] = loc->dtmf_stored[i];	
			if (loc->dtmf_accepted[j][i] == 'N' && atoi(test) >= 2 && atoi(test) <= 9)
				cMatch = SWITCH_TRUE;
			if (loc->dtmf_accepted[j][i] == 'X' && atoi(test) >= 0 && atoi(test) <= 9) {
				cMatch = SWITCH_TRUE;
			}
			if (i >= strlen(loc->dtmf_accepted[j]) - 1 && loc->dtmf_accepted[j][strlen(loc->dtmf_accepted[j])-1] == '.')
				cMatch = SWITCH_TRUE;
			if (loc->dtmf_accepted[j][i] == loc->dtmf_stored[i])
				cMatch = SWITCH_TRUE;

			if (cMatch == SWITCH_FALSE) {
				is_invalid[j] = SWITCH_TRUE;
				continue;
			}

			if (i == strlen(loc->dtmf_accepted[j]) - 1 && loc->dtmf_accepted[j][strlen(loc->dtmf_accepted[j])-1] == '.') {
				loc->completeMatch = loc->dtmf_accepted[j];
			} 
			if (i == loc->dtmf_received - 1 && loc->dtmf_received == strlen(loc->dtmf_accepted[j]) && loc->dtmf_accepted[j][strlen(loc->dtmf_accepted[j])-1] != '.') {
				loc->completeMatch = loc->dtmf_accepted[j];
				continue;
			}
			loc->potentialMatchCount++;
		}
	}

	return 1;
}

static switch_status_t cb_on_dtmf_ignore(switch_core_session_t *session, void *input, switch_input_type_t itype, void *buf, unsigned int buflen)
{
	switch (itype) {
		case SWITCH_INPUT_TYPE_DTMF:
			{
				switch_channel_t *channel = switch_core_session_get_channel(session);
				switch_dtmf_t *dtmf = (switch_dtmf_t *) input;
				switch_channel_queue_dtmf(channel, dtmf);
				return SWITCH_STATUS_BREAK;
			}
		default:
			break;
	}
	return SWITCH_STATUS_SUCCESS;
}

static switch_status_t cb_on_dtmf(switch_core_session_t *session, void *input, switch_input_type_t itype, void *buf, unsigned int buflen)
{
	ivre_data_t *loc = (ivre_data_t*) buf;

	switch (itype) {
		case SWITCH_INPUT_TYPE_DTMF:
			{
				switch_dtmf_t *dtmf = (switch_dtmf_t *) input;
				switch_bool_t audio_was_stopped = loc->audio_stopped;	
				loc->audio_stopped = SWITCH_TRUE;

				if (loc->dtmf_received >= sizeof(loc->dtmf_stored)) {
					loc->result = RES_BUFFER_OVERFLOW;
					break;
				}
				if (!loc->terminate_key || dtmf->digit != loc->terminate_key)
					loc->dtmf_stored[loc->dtmf_received++] = dtmf->digit;

				match_dtmf(session, loc);

				if (loc->terminate_key && dtmf->digit == loc->terminate_key && loc->result == RES_WAITFORMORE) {
					if (loc->potentialMatchCount == 1 && loc->completeMatch != NULL) {
						loc->result = RES_FOUND;
					} else {
						loc->result = RES_INVALID;
					}
					return SWITCH_STATUS_BREAK;
				} else {
					if (loc->potentialMatchCount == 0 && loc->completeMatch != NULL) {
						loc->result = RES_FOUND;
						return SWITCH_STATUS_BREAK;
					} else if (loc->potentialMatchCount > 0) {
						loc->result = RES_WAITFORMORE;
						if (!audio_was_stopped)
							return SWITCH_STATUS_BREAK;
					} else {
						loc->result = RES_INVALID;
						return SWITCH_STATUS_BREAK;
					}
				}
			}
			break;
		default:
			break;
	}

	return SWITCH_STATUS_SUCCESS;
}

switch_status_t ivre_init(ivre_data_t *loc, char **dtmf_accepted) {
	int i;

	memset(loc, 0, sizeof(*loc));

	for (i = 0; dtmf_accepted[i] && i < 128; i++) {
		strncpy(loc->dtmf_accepted[i], dtmf_accepted[i], 16);
	}
	loc->record_tone = "%(1000, 0, 640)";

	return SWITCH_STATUS_SUCCESS;
}

switch_status_t ivre_playback_dtmf_buffered(switch_core_session_t *session, const char *macro_name,  const char *data, switch_event_t *event, const char *lang, int timeout) {
	switch_status_t status = SWITCH_STATUS_SUCCESS;
	switch_channel_t *channel = switch_core_session_get_channel(session);

	if (switch_channel_ready(channel)) {
		switch_input_args_t args = { 0 };

		args.input_callback = cb_on_dtmf_ignore;

		if (macro_name) {
			status = switch_ivr_phrase_macro_event(session, macro_name, data, event, lang, &args);
		}
	} else {
		status = SWITCH_STATUS_BREAK;
	}

	return status;
}


switch_status_t ivre_playback(switch_core_session_t *session, ivre_data_t *loc, const char *macro_name,  const char *data, switch_event_t *event, const char *lang, int timeout) {
	switch_status_t status = SWITCH_STATUS_SUCCESS;
	switch_channel_t *channel = switch_core_session_get_channel(session);

	if (switch_channel_ready(channel)) {
		switch_input_args_t args = { 0 };

		args.input_callback = cb_on_dtmf;
		args.buf = loc;

		if (macro_name && loc->audio_stopped == SWITCH_FALSE && loc->result == RES_WAITFORMORE) {
			status = switch_ivr_phrase_macro_event(session, macro_name, data, event, lang, &args);
		}

		if (switch_channel_ready(channel) && (status == SWITCH_STATUS_SUCCESS || status == SWITCH_STATUS_BREAK) && timeout && loc->result == RES_WAITFORMORE) {
			loc->audio_stopped = SWITCH_TRUE;
			switch_ivr_collect_digits_callback(session, &args, timeout, 0);
			if (loc->result == RES_WAITFORMORE) {
				if (loc->potentialMatchCount == 1 && loc->completeMatch != NULL) {
					loc->result = RES_FOUND;
				} else {
					loc->result = RES_TIMEOUT;
				}
			}
		}
	} else {
		status = SWITCH_STATUS_BREAK;
	}

	return status;
}

switch_status_t ivre_record(switch_core_session_t *session, ivre_data_t *loc, switch_event_t *event, const char *file_path, switch_file_handle_t *fh, int max_record_len, switch_size_t *record_len) {
	switch_status_t status = SWITCH_STATUS_SUCCESS;
	switch_channel_t *channel = switch_core_session_get_channel(session);

	if (switch_channel_ready(channel)) {
		switch_input_args_t args = { 0 };

		args.input_callback = cb_on_dtmf;
		args.buf = loc;

		if (loc->audio_stopped == SWITCH_FALSE && loc->result == RES_WAITFORMORE) {
			loc->recorded_audio = SWITCH_TRUE;
			switch_ivr_gentones(session, loc->record_tone, 0, NULL);
			status = switch_ivr_record_file(session, fh, file_path, &args, max_record_len);

			if (record_len) {
				*record_len = fh->samples_out / (fh->samplerate ? fh->samplerate : 8000);
			}

		}
		if (loc->result == RES_WAITFORMORE) {
			loc->result = RES_TIMEOUT;
		}

	} else {
		status = SWITCH_STATUS_BREAK;
	}

	return status;
}


/* For Emacs:
 * Local Variables:
 * mode:c
 * indent-tabs-mode:t
 * tab-width:4
 * c-basic-offset:4
 * End:
 * For VIM:
 * vim:set softtabstop=4 shiftwidth=4 tabstop=4 noet
 */
