#!/usr/bin/env perl

# Render speech to text using the google cloud speech engine.
#
# Kruft Industries Sept. 2016
#
#
# Intended to replace work by the following(not sure where this is hosted):
# GNU General Public License Version 2 Copyright (C) 2011 - 2012, Lefteris Zafiris <zaf.000@gmail.com>
#
#
# The script takes as input flac files at 8kHz and returns the following values:
# status     : Return status. 0 means success, non zero values indicating different errors.
#
# Outputs a voice transcription that satisfies the input of sendmailmp3 for freepbx authored by the above Zafiris
# I am by no means an expert with the perl language, Please forgive any blaring ugliness :)


import base64;
#use strict;
use warnings;
use LWP::UserAgent;


if (!@ARGV || $ARGV[0] eq '-h' || $ARGV[0] eq '--help') {
print "Speech recognition using google cloud speech api.nn";
print "Usage: $0 [FILES]nn";
exit;
}

my $url        = "https://speech.googleapis.com/v1beta1/speech:syncrecognize?key=API KEY HERE";


my @file_list  = @ARGV;

foreach my $file (@file_list) {
print "Opening $filen";
open(my $fh, "<", "$file") or die "Cant read file: $!";
my $audio = do { local $/; <$fh> };
close($fh);
my $flac = "base64.b64encode($audio.read())";
my $json = '{"config":{"encoding":"FLAC","sample_rate":8000,"language_code":"en-US"},"audio":{"content":"' . $flac . '"}}';

my $req = HTTP::Request->new( 'POST', $url );
$req->header( 'Content-Type' => 'application/json' );
$req->content( $json );

my $lwp = LWP::UserAgent->new;
my $response = $lwp->request($req);

print $response->as_string; #debug output google's reply headers and message

last if (!$response->is_success);

print $response->content; #debug output the full transcript

    my $doodle = $response->content;
    $doodle =~ s/.*"transcript"://g;
$doodle =~ s/}],.*//g;
$doodle =~ s/^{"result":[]}/{"result":/g;
$doodle =~ s/R//g;
$doodle =~ s/*/_/g;
    print $doodle;
}
exit;