# TTYverse Text-to-Speech Extension
# By Storm Dragon: https://stormux.org/
# Support Storm Dragon's work: https://patreon.com/stormux
# Published under the Floodgap Free Software License: http://www.floodgap.com/software/ffsl/

# What is it?
# This extension uses text-to-speech to read incoming fediverse posts.
# Multiple synthesizer engines are supported for accessibility.

# Usage:
# Toggle TTS on/off: /tts
# Get help: /tts help
# Load extension when starting TTYverse or add to configuration

$addaction = sub {
    my $command = shift;
    my $speak = "";
    
    # Get current TTS state from config
    my $tts_config = "$ENV{'HOME'}/.config/ttyverse/tts_enabled";
    if (-e $tts_config) {
        open TTSSETTINGS, $tts_config;
        $speak = <TTSSETTINGS>;
        close TTSSETTINGS;
        chomp($speak) if defined($speak);
    } else {
        $speak = 0;
    }
    
    if ($command eq '/tts') {
        if ((!defined($speak)) || ($speak eq 1)) {
            $speak = 0;
            print $streamout "-- Text-to-speech disabled\n";
        } else {
            $speak = 1;
            print $streamout "-- Text-to-speech enabled\n";
        }
        
        # Save new state
        open TTSSETTINGS, ">$tts_config";
        print TTSSETTINGS "$speak";
        close TTSSETTINGS;
        return 1;
    }
    
    if ($command eq "/tts help") {
        my $ttsHelp = "TTYverse Text-to-Speech Extension\n\n" .
                     "Commands:\n" .
                     "  /tts       - Toggle speech on/off\n" .
                     "  /tts help  - Show this help\n\n" .
                     "Configuration (add to TTYverse config):\n\n" .
                     "extpref_tts_synthesizer=synthName\n" .
                     "  Available: espeak (default), festival, pico, cepstral, mac\n\n" .
                     "extpref_tts_language=languageCode\n" .
                     "  Default: en-US (supported by espeak and pico)\n\n" .
                     "extpref_tts_rate=number\n" .
                     "  Speech rate, default: 175 (espeak only)\n\n" .
                     "extpref_tts_variant=name\n" .
                     "  Voice variant/name (espeak variants, cepstral/mac voices)\n";
        print $streamout "$ttsHelp";
        return 1;
    }
    return 0;
};

$handle = sub {
    my $ref = shift;
    my $class = shift;
    
    # Skip TTS during initial timeline load
    if ($last_id eq 0) {
        &defaulthandle($ref);
        return 1;
    }
    
    my $speak = "";
    # Get TTS state from config
    my $tts_config = "$ENV{'HOME'}/.config/ttyverse/tts_enabled";
    if (-e $tts_config) {
        open TTSSETTINGS, $tts_config;
        $speak = <TTSSETTINGS>;
        close TTSSETTINGS;
        chomp($speak) if defined($speak);
    } else {
        $speak = 0;
    }
    
    # Initialize TTS configuration
    my $soundCommand = "paplay";  # Default for modern Linux/PulseAudio
    my $synthesizer = $extpref_tts_synthesizer || "espeak";
    my $language = $extpref_tts_language || "en-US";
    my $variant = $extpref_tts_variant || "";
    my $rate = $extpref_tts_rate || "";
    
    # Override sound command if configured
    if ($extpref_sound_command) {
        $soundCommand = $extpref_sound_command;
    }
    
    # Extract post content for TTS
    my $postText = &descape($ref->{'account'}->{'display_name'} || $ref->{'account'}->{'username'}) . 
                   " posted: " . &descape($ref->{'content'});
    
    # Make speech more accessible
    $postText =~ s/\"/ /g;                                    # Remove quotes
    $postText =~ s/ \#/ hashtag /g;                          # Make hashtags readable
    $postText =~ s/https?:\/\/\S+/ link /g;                  # Simplify links
    $postText =~ s/www\./ /g;                                # Remove www
    $postText =~ s/\// forward slash /g;                     # Make slashes readable
    $postText =~ s/\\/ back slash /g;                        # Make backslashes readable
    $postText =~ s/\blol\b/ laughs out loud /gi;             # Expand common abbreviations
    $postText =~ s/\brofl\b/ rolling on the floor laughing /gi;
    $postText =~ s/<[^>]*>//g;                               # Remove any remaining HTML
    
    my $speechCommand = "";
    
    # Configure synthesizer command
    if ($synthesizer eq "cepstral") {
        $speechCommand = "aoss swift ";
        if ($variant ne "") {
            $speechCommand .= "-n $variant ";
        }
        $speechCommand .= "\"$postText\"";
    } elsif ($synthesizer eq "espeak") {
        if ($rate eq "") {
            $rate = "175";
        }
        $speechCommand = "$synthesizer -v " . lc($language);
        if ($variant ne "") {
            $speechCommand .= "+$variant";
        }
        $speechCommand .= " -s $rate \"$postText\"";
    } elsif ($synthesizer eq "festival") {
        $speechCommand = "echo \"$postText\" | festival --tts";
    } elsif ($synthesizer eq "mac") {
        $speechCommand = "say ";
        if ($variant ne "") {
            $speechCommand .= "-v $variant ";
        }
        $speechCommand .= "\"$postText\"";
    } elsif ($synthesizer eq "pico") {
        $speechCommand = "pico2wave -l $language -w /tmp/ttyverse.wav \"$postText\" && $soundCommand /tmp/ttyverse.wav";
    }
    
    # Speak the post if TTS is enabled
    if ($speak eq 1) {
        system("$speechCommand");
    }
    
    # Allow TTYverse to display the post normally
    &defaulthandle($ref);
    return 1;
};