#!/usr/bin/perl
use strict;
use warnings;

# Local modules
use Cwd qw(abs_path);
use File::Basename qw(dirname);
use lib dirname(abs_path($0));
use DMX;

# Config
my $TIMEOUT     = 900;
my $COUNTDOWN   = 119;
my $OFF_DELAY   = 15;
my $CMD_DELAY   = 20;
my $PAUSE_DELAY = 10;

# Available color modes, bright to dark:
#	DYNAMIC
#	NATURAL
#	THEATER
#	THEATER_BLACK_1
#
# Color modes by proportion of lamp life
my $LAMP_LIFE = 1625;
my %COLORS    = (
	'0.332' => {
		'high' => 'THEATER',
		'play' => 'THEATER_BLACK_1',
		'low'  => 'THEATER_BLACK_1',
	},
	'0.600' => {
		'high' => 'NATURAL',
		'play' => 'THEATER',
		'low'  => 'THEATER_BLACK_1',
	},
	'0.700' => {
		'high' => 'DYNAMIC',
		'play' => 'NATURAL',
		'low'  => 'THEATER_BLACK_1',
	},
	'0.800' => {
		'high' => 'DYNAMIC',
		'play' => 'DYNAMIC',
		'low'  => 'THEATER_BLACK_1',
	},
);

# App config
my $DATA_DIR     = DMX::dataDir();
my $STATE_SOCK   = 'PROJECTOR_POWER';
my $PROJ_SOCK    = 'PROJECTOR';
my $OUTPUT_FILE  = $DATA_DIR . $STATE_SOCK;
my $PUSH_TIMEOUT = 20;
my $PULL_TIMEOUT = $PUSH_TIMEOUT * 3;
my $DELAY        = $PULL_TIMEOUT / 2;

# Prototypes
sub sayShutdown($);

# Debug
my $DEBUG = 0;
if ($ENV{'DEBUG'}) {
	$DEBUG = 1;
}

# Sockets
DMX::stateSocket($STATE_SOCK);
DMX::stateSubscribe($STATE_SOCK);
my $proj = DMX::clientSock($PROJ_SOCK);

# State
my $state        = 'OFF';
my $stateLast    = $state;
my %exists       = ();
my %mtime        = ();
my $pushLast     = 0;
my $pullLast     = time();
my $update       = 0;
my $lastAnnounce = 0;
my $lastUser     = time();
my $shutdown     = 0;
my $life         = 0;
my @color_sets   = sort { $a <=> $b } keys(%COLORS);
my $color_set    = $color_sets[0];
my $color        = $COLORS{$color_set}{'low'};
my $lastPlay     = 0;

# Loop forever
while (1) {

	# State is calculated; use newState to gather data
	my $newState = $state;

	# Wait for state updates
	my $cmdState = DMX::readState($DELAY, \%exists, \%mtime, undef());

	# Avoid repeated calls to time()
	my $now = time();

	# Record only valid states
	if (defined($cmdState)) {
		$newState = $cmdState;
		$pullLast = $now;
	}

	# Die if we don't see regular updates
	if ($now - $pullLast > $PULL_TIMEOUT) {
		die('No update on state socket in past ' . $PULL_TIMEOUT . " seconds. Exiting...\n");
	}

	# Menu changes count as activity
	if ($mtime{'GUI'} && $lastUser < $mtime{'GUI'}) {
		$lastUser = $mtime{'GUI'};
	}

	# Projector starts count as activity
	if ($exists{'PROJECTOR'} && $lastUser < $mtime{'PROJECTOR'}) {
		$lastUser = $mtime{'PROJECTOR'};
	} elsif ($newState eq 'ON') {
		$lastUser = $now;
	}

	# Playing counts as activity
	if ($exists{'PLAYING'} && $lastUser < $now) {
		$lastUser = $now;
	}

	# Clear the shutdown timestamp if there is new user activity
	if ($shutdown && (!$exists{'PROJECTOR'} || $lastUser > $shutdown)) {
		$shutdown = 0;
	}

	# Record the shutdown timestamp, if the projector is on
	if ($newState eq 'SHUTDOWN' && $exists{'PROJECTOR'}) {
		if ($DEBUG) {
			print STDERR "Recorded shutdown timestamp\n";
		}
		$shutdown = $now;
		$lastUser = $now;
	}

	# Calculate the elapsed time
	my $elapsed = $now - $lastUser;
	if ($DEBUG) {
		print STDERR 'Time since last user action: ' . $elapsed . "\n";
	}

	# Calculate the new state
	$stateLast = $state;
	if ($exists{'PROJECTOR'}) {
		if ($shutdown) {
			$state = 'SHUTDOWN';
			if ($elapsed > $OFF_DELAY) {
				$state = 'OFF';
			}
		} else {
			if ($elapsed > $TIMEOUT) {
				$state = 'COUNTDOWN';
				if ($elapsed > $TIMEOUT + $COUNTDOWN) {
					$state = 'OFF';
				}
			} else {
				$state = 'ON';
			}
		}
	} else {
		if ($newState eq 'ON') {
			$state = 'ON';
		}
	}

	# Select a color set based on the lamp life
	if (exists($exists{'PROJECTOR_LAMP'})) {
		$life = $exists{'PROJECTOR_LAMP'} / $LAMP_LIFE;
		if ($DEBUG) {
			print STDERR 'Lamp life: ' . ($life * 100) . "%\n";
		}
		my $max_set_num = scalar(@color_sets) - 1;
		$color_set = $color_sets[$max_set_num];
		for (my $i = 0 ; $i < $max_set_num ; $i++) {
			if ($life < $color_sets[$i]) {
				$color_set = $color_sets[$i];
				last;
			}
		}
		if ($DEBUG) {
			print STDERR 'Color set: ' . $color_set . "\n";
		}
	}

	# Calculate the color mode
	# PLAY for normal playback
	# HIGH when playing and LIGHTS || BRIGHT
	# LOW for audio, and when we're half way to the timeout (to save the bulb)
	# HIGH when the GUI is up
	# PLAY if we haven't figured out what else to do
	my $playLights = 0;
	if ($newState eq 'PLAY') {
		$lastPlay   = $now;
		$playLights = 1;
	} elsif ($newState eq 'PAUSE' && $lastPlay + $PAUSE_DELAY > $now) {
		$playLights = 1;
	} elsif ($exists{'PLAYING_TYPE'} eq 'audio') {
		$color = $COLORS{$color_set}{'low'};
	} elsif ($elapsed > $TIMEOUT / 2) {
		$color = $COLORS{$color_set}{'low'};
	} elsif ($exists{'GUI'}) {
		$color = $COLORS{$color_set}{'high'};
	} else {
		$playLights = 1;
	}

	# If playLights was set, choose the color mode based on the LIGHTS setting
	if ($playLights) {
		$color = $COLORS{$color_set}{'play'};
		if ($exists{'LIGHTS'} || $exists{'BRIGHT'}) {
			$color = $COLORS{$color_set}{'high'};
		}
	}
	if ($DEBUG) {
		print STDERR 'Selected color: ' . $color . "\n";
	}

	# Force updates on a periodic basis
	if (!$update && $now - $pushLast > $PUSH_TIMEOUT) {

		# Not for the projector
		#if ($DEBUG) {
		#	print STDERR "Forcing periodic update\n";
		#}
		#$update = 1;
	}

	# Force updates on any state change
	if (!$update && $stateLast ne $state) {
		if ($DEBUG) {
			print STDERR 'State change: ' . $stateLast . ' => ' . $state . "\n";
		}
		$update = 1;
	}

	# Force updates when there is a physical state mistmatch
	if (!$update && $state eq 'OFF' && $exists{'PROJECTOR'}) {
		if ($DEBUG) {
			print STDERR 'Physical state mismatch: ' . $state . ':' . $exists{'PROJECTOR'} . "\n";
		}
		$update = 1;
	}

	# Set the color mode as needed
	if ($exists{'PROJECTOR'} && $exists{'PROJECTOR_COLOR'} ne $color) {
		if ($DEBUG) {
			print STDERR 'Setting color to: ' . $color . "\n";
		}
		$proj->send($color)
		  or die('Unable to write command to projector socket: ' . $color . ": ${!}\n");
	}

	# Announce a pending shutdown
	if ($state eq 'COUNTDOWN' || $state eq 'SHUTDOWN') {
		my $timeLeft = 0;
		if ($state eq 'SHUTDOWN') {
			$timeLeft = $OFF_DELAY - $elapsed;
		} else {
			$timeLeft = ($TIMEOUT + $COUNTDOWN) - $elapsed;
		}
		sayShutdown($timeLeft / 60);
	}

	# Only allow updates to "ON" or "OFF" -- the projector knows no other states
	if ($update && ($state ne 'ON' && $state ne 'OFF')) {
		if ($DEBUG) {
			print STDERR 'Ignoring update state other than ON/OFF: ' . $state . "\n";
		}
		$update = 0;
	}

	# Only allow updates every few seconds -- the projector goes dumb during power state changes
	if ($update && $now < $pushLast + $CMD_DELAY) {
		if ($DEBUG) {
			print STDERR 'Ignoring overrate update: ' . $state . "\n";
		}
		$update = 0;
	}

	# Update the projector
	if ($update) {

		# Extra debugging to record pushes
		if ($DEBUG) {
			print STDERR 'State: ' . $state . "\n";
		}

		# Send master power state
		$proj->send($state)
		  or die('Unable to write command to proj socket: ' . $state . ": ${!}\n");

		# Annouce the state change, after the fact
		DMX::say('Projector ' . $state);

		# Announce lamp life status, if near/past $LAMP_LIFE
		if (exists($exists{'PROJECTOR_LAMP'})) {
			if ($life > 0.9) {
				my $chance = ($life - 0.9) * 10;
				if (rand(1) <= $chance) {
					DMX::say('Projector lamp has run for ' . int($life * 100) . '% of its estimated life.');
				}
			}
		}

		# No output file

		# Update the push time
		$pushLast = $now;

		# Clear the lastAnnounce timer
		$lastAnnounce = 0;

		# Clear the update flag
		$update = 0;
	}
}

sub sayShutdown($) {
	my ($minutesLeft) = @_;

	# Only allow annoucements once per minute
	my $now = time();
	if ($now < $lastAnnounce + 60) {
		return;
	}
	$lastAnnounce = $now;

	# Determine the unit
	my $unit     = 'minute';
	my $timeLeft = $minutesLeft;
	if ($minutesLeft < 1) {
		$timeLeft = $minutesLeft * 60;
		$unit     = 'second';
	}

	# Avoid saying "0" unless we *really* mean it
	$timeLeft = ceil($timeLeft);

	# Add an "s" as needed
	my $plural = 's';
	if ($timeLeft == 1) {
		$plural = '';
	}
	$unit .= $plural;

	# Speak
	DMX::say('Projector shutdown in about ' . $timeLeft . ' ' . $unit);
}