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#!/usr/bin/perl

use strict;
use warnings;
use utf8;

use lib '/usr/local/lib/perl5';  # To be used together with the cpanm command given in the README.md file.

BEGIN {
  $ENV{DISPLAY} //= ':0';
}

use IPC::Run;
use Tkx;
use X11::Protocol;

$| = 1;  # auto-flush

my ($screen_x, $screen_y);
{
  my $X = X11::Protocol->new();
  $screen_x = $X->{screens}[0]{width_in_pixels} // 320;
  $screen_y = $X->{screens}[0]{height_in_pixels} // 240;
}

open my $pigpio, '>', '/dev/pigpio';

my $wnd = Tkx::widget->new('.');

# fullscreen removes the border of the window but does not actually make it
# fullscreen (maybe because we don’t have a real window manager... which also
# means that we don’t have a border anyway).
$wnd->g_wm_attribute(-fullscreen => 1, -topmost => 1);
$wnd->g_wm_resizable(0, 0);
$wnd->configure(-cursor => 'none');
$wnd->g_wm_geometry("${screen_x}x${screen_y}");

my $media_control_frame = $wnd->new_ttk__frame(-borderwidth => 5); # The border is here only to debug
$media_control_frame->g_grid(-column => 0, -row => 0, -sticky => 'nswe');
$wnd->g_grid_columnconfigure(0, -weight => 1);
$wnd->g_grid_rowconfigure(0, -weight => 1);

# The default font does not have the media control glyphs. So let’s create a
# style using Unifont that has almost all glyphs.
# Useful link: https://en.wikipedia.org/wiki/Media_control_symbols
Tkx::ttk__style_configure('Unicode.TButton', -font => 'Unifont 15');

$media_control_frame->g_grid_columnconfigure(0, -weight => 1);
$media_control_frame->g_grid_columnconfigure(1, -weight => 1);
$media_control_frame->g_grid_rowconfigure(0, -weight => 1);
$media_control_frame->g_grid_rowconfigure(1, -weight => 1);

my $vlc_in;
my $vlc_out;
# my $vlc = IPC::Run::start ['vlc', '--intf', 'rc', '--alsa-audio-device', 'dac'], $vlc_in;
my $vlc = IPC::Run::start ['vlc', '--intf', 'rc'], $vlc_in, \$vlc_out;

$vlc_in = '';
$vlc_out = '';

# It’s unclear what is the default volume and what is the real max level that can
# be set. So, for now, we do nothing.

my $cmd_sent = 0;
my $cmd_read = 0;
my %cmd_cb;

sub send_cmd {
  my ($cmd, $sub) = @_;
  if ($cmd_read < $cmd_sent) {
    # In theory we could send multiple command. Unfortunately, in practice, VLC
    # will sometime answer with multiple answers in a row, without the
    # separating carret. So let’s slow down.
    Tkx::after('idle', sub { send_cmd($cmd, $sub) });
    return;
  }
  $vlc_in .= $cmd."\n" if defined $cmd;
  $cmd_sent++;
  print "Sending command ${cmd_sent}\n";
  if (defined $sub) {
    $cmd_cb{$cmd_sent} = $sub;
  }
  pump_vlc_in();
}

sub pump_vlc_in {
  print "pumping: $vlc_in\n";
  IPC::Run::pump $vlc if length $vlc_in;
  print "pump! ($vlc_in)\n";
  if (length $vlc_in) {
    Tkx::after('idle', \&pump_vlc_in);
  } else {
    pump_vlc_out();
  }
}

sub pump_vlc_out {
  IPC::Run::pump_nb $vlc;
  print "pumping (read): -->${vlc_out}<--\n";
  if ($vlc_out =~ m/^> /m) {
    $cmd_read++;
    my $cmd_out = substr $vlc_out, 0, $-[0];
    substr $vlc_out, 0, $+[0], '';
    print "Read command output (${cmd_read})\n";
    if (my $cb = delete $cmd_cb{$cmd_read}) {
      $cb->($cmd_out);