#!/usr/bin/php -q
<?php
require('phpagi.php');
$agi = new AGI();

/*
   1) GET ARG
*/
if (!isset($argv[1]) || trim($argv[1]) == "") {
    $agi->verbose("No TTS text provided", 3);
    exit;
}

$text = trim($argv[1]);
$agi->verbose("Incoming TTS: $text", 3);

/*
   2) BUILD GOOGLE URL
*/
$encoded = urlencode($text);
$tts_url = "https://translate.google.com/translate_tts?ie=UTF-8&q={$encoded}&tl=en&client=tw-ob";

/*
   3) CACHE DIRECTORY
*/
$cache_dir = "/var/lib/asterisk/sounds/tts_cache";
if (!is_dir($cache_dir)) {
    mkdir($cache_dir, 0755, true);
}

/*
   4) BUILD HASHED CACHE FILENAME
*/
$hash = md5($text);
$mp3_file = "$cache_dir/$hash.mp3";

$agi->verbose("Cache filename: $mp3_file", 3);

/*
   5) CHECK CACHE FIRST
*/
if (file_exists($mp3_file) && filesize($mp3_file) > 200) {
    $agi->verbose("Cache hit! Playing existing file...", 3);
    $agi->exec("MP3Player", $mp3_file);
    exit;
}

/*
   6) NOT CACHED — DOWNLOAD FROM GOOGLE
*/
$agi->verbose("Cache miss — downloading from Google...", 3);

$cmd = "wget -q -U Mozilla -O '$mp3_file' '$tts_url'";
exec($cmd);

if (!file_exists($mp3_file) || filesize($mp3_file) < 200) {
    $agi->verbose("TTS download failed", 3);
    unlink($mp3_file);
    exit;
}

$agi->verbose("Download complete — playing MP3", 3);

/*
   7) PLAY NEW FILE
*/
$agi->exec("MP3Player", $mp3_file);

/*
   8) Done — file stays cached for future calls
*/
?>