#!/usr/bin/php -q
<?php
//	License for all code of this FreePBX module can be found in the license file inside the module directory
//	Copyright 2013 Schmooze Com Inc.
//  Xavier Ourciere xourciere[at]propolys[dot]com
//

$config = parse_amportal_conf( "/etc/amportal.conf" );

require_once "phpagi.php";
require_once "phpagi-asmanager.php";

$AGI = new AGI();
debug("TTS AGI Started", 1);

$text = $argv[1];
$hash = md5($text);
$engine = $argv[2];
$enginebin = $argv[3];

$f = $AGI->get_full_variable('${CHANNEL(audionativeformat)}');
$nformat = $f['data'];
$format = array(
	"ext" => "sln",
	"rate" => "8000"
);

//amazing work my friend: https://github.com/stevenmirabito/asterisk-picotts/blob/master/picotts.agi#L251
switch(true) {
	case preg_match('/(silk|sln)12/',$nformat):
		$format = array(
			"ext" => "sln12",
			"rate" => "12000"
		);
	break;
	case preg_match('/(speex|slin|silk)16|g722|siren7/',$nformat):
		$format = array(
			"ext" => "sln16",
			"rate" => "16000"
		);
	break;
	case preg_match('/(speex|slin|celt)32|siren14/',$nformat):
		$format = array(
			"ext" => "sln32",
			"rate" => "32000"
		);
	break;
	case preg_match('/(celt|slin)44/',$nformat):
		$format = array(
			"ext" => "sln44",
			"rate" => "44000"
		);
	break;
	case preg_match('/(celt|slin)48/',$nformat):
		$format = array(
			"ext" => "sln48",
			"rate" => "48000"
		);
	break;
	default;
		$format = array(
			"ext" => "sln",
			"rate" => "8000"
		);
	break;
}

if (!isset($text))
{
	return 0;
}

if ( $retval != 0 ) {
	debug("ERROR: TTS engine binary not found.", 1);
	return $retval;
}

$soundsdir = $config["ASTVARLIBDIR"]."/sounds/tts";
if( !is_dir($soundsdir) ) mkdir($soundsdir, 0775);

$wavefile = $soundsdir."/$engine-tts-$hash.".$format['ext'];
$tmpwavefile = $soundsdir."/$engine-tts-temp-$hash.wav";
debug("Generated WAV file: $wavefile", 3);
$textfile = $soundsdir."/$engine-tts-$hash.txt";
debug("TXT file: $textfile", 3);

if ( !file_exists($wavefile) ) {
	debug("Text to speech wave file doesnt exist, lets create it.", 1);
	if ( false === ($fh = fopen($textfile, "w")) ) {
		debug("ERROR: Cannot open the file: $textfile", 1);
		return 1;
	}
	if ( false === fwrite($fh, $text) ) {
		debug("ERROR: Cannot write to file: $textfile", 1);
		return 1;
	}
	fclose($fh);
	debug("Executing $engine", 1);
	switch ($engine) {
		case 'text2wave':
			exec($enginebin." -f ".$format['rate']." -o $tmpwavefile $textfile");
			break;
		case 'flite':
			exec($enginebin." -f $textfile -o $tmpwavefile");
			break;
		case 'swift':
			exec($enginebin." -p audio/channels=1,audio/sampling-rate=".$format['rate']." -o $tmpwavefile -f $textfile");
			break;
		case 'pico':
			exec($enginebin." -o $tmpwavefile ".escapeshellarg(file_get_contents($textfile)));
			break;
		case 'polly':
			exec($enginebin." /opt/aws-nodejs/polly.js --mp3=/var/lib/asterisk/sounds/tts/$engine-tts-$hash.mp3 --text='$text' --wav=/var/lib/asterisk/sounds/tts/$engine-tts-temp-$hash");
			break;
		default:
			debug("$engine is not a valid engine!", 1);
		break;
	}
}
if(file_exists($tmpwavefile)) {
	exec("sox $tmpwavefile -q -r ".$format['rate']." -t raw $wavefile");
	unlink($tmpwavefile);
}

if(file_exists($wavefile)) {
	// Adding a wait because the first time the wave file is generated, it was not played
	$AGI->wait_for_digit(1000);
	debug("Streaming the generated wave.", 1);
	$AGI->stream_file("tts/".basename($wavefile,".".$format['ext']),'#');
} else {
	debug("File was not created!", 1);
}
debug("TTS AGI end", 1);

function parse_amportal_conf($filename) {
	$file = file($filename);
	$matches = array();
	$matchpattern = '/^\s*([a-zA-Z0-9]+)\s*=\s*(.*)\s*([;#].*)?/';
	foreach ($file as $line) {
		if (preg_match($matchpattern, $line, $matches)) {
			$conf[ $matches[1] ] = $matches[2];
		}
	}
	return $conf;
}

function debug($string, $level=3) {
	global $AGI;
	$AGI->verbose($string, $level);
}