#!/usr/bin/perl
######################
#
# VARIABLES,
# PACKAGES, & DEFINES
#
######################
use strict;
use warnings;
use diagnostics;
use Term::ReadKey;
use Win32::Console::ANSI qw/ Title SetCloseButton Cursor :SW_ /;
use Win32::Console::ANSI;
use Win32::Console;
use Term::ANSIColor;
use Term::ANSIScreen qw/:cursor :screen/;


##########################
#
# SET TERMINAL ATTRIBUTES
#
##########################

$SIG{INT}= 'IGNORE';
SetCloseButton(0);
ShowConsoleWindow(SW_SHOWMAXIMIZED);

####################################
#
# LOGGING KEY STROKE TIME STAMP SUB
#
####################################

my $time = localtime(time); # ADD TIME STAMP TO LOGFILE

##################
#
# SET SERIAL PORT
#
##################

my $port = setup_serial_port("COM7") or die "Open Port Failed. $!\n";

##################
#
# MAIN SCREEN SUB
#
##################

no warnings 'numeric';

#Title "Simple Signals Driver";
print colored("CONNECTING TO SIGNAL SYSTEM...", 'bold green'), "\n";
sleep(15);
print "\n",
      colored("CONNECTED...",'bold green'), "\n",
      colored("STARTING RELAY SIGNAL PROGRAM", 'bold green'), "\n\n";

# Buffer used to build our command line
my $command_line = "";

# Buffer for our serial data
my $serial_input;           # Holds incomplete command(s)
my @serial_data = ();       # Commands ready to process

# Put console into raw mode
ReadMode 4;

setup_serial_interface();

my $are_we_done_yet = 0;
while (!$are_we_done_yet) {

    # Check for console activity
    my $con_key = ReadKey(-1);
    if (defined $con_key) {
        if ($con_key eq "\r" or $con_key eq "\n") {
            # user finished entering the command
            handle_command($command_line);
            $command_line = "";
        } else {
            # Not end of line, so add to command line.
            # NOTE: you'll want to handle backspace and/or
            # other line editing commands.  But that's too
            # much work for a quick demo...
            $command_line .= $con_key;
        }
    } elsif (is_serial_data_ready()) {
        # Serial device gave us something to do
        handle_serial_data();
    }
    else {
        # NOTE: I'd try to wait here so we don't kill a CPU, but without
        # Time::HiRes, we can only sleep for an entire second, and that
        # would make console I/O feel sluggish.  So until we resolve that,
        # we'll just kill a CPU
        #NEED SHORT DELAY HERE TO LET OTHER PROCESSES HAVE CPU
    }
}

close_serial_port();
ReadMode(0); # RESTORE CONSOLE MODE

#################
#
# HANDLE COMMAND
#
#################

sub handle_command {
    my $cmd = shift;
    if ($cmd =~ /^q/i) {
        print "\n", colored("QUIT PROGRAM!", 'bold yellow'), "\n";
        $are_we_done_yet = 1;
    } elsif ($cmd =~ /^\d+$/i) {
        print colored("\nSENDING COMMAND $cmd $time...", 'bold yellow'), "\n\n";
        $port->write("$cmd\r");
        $port->lookclear();
        print colored("DONE!", 'bold yellow'), "\n\n";
    } else {
        print colored("UNKNOWN COMMAND: $cmd", 'bold red'), "\n";
    }
}

#############################
#
# USB/SERIAL/INTERFACE WITH
# THE ARDUINO
#
#############################

sub setup_serial_interface {
    use Win32::SerialPort;
    my $COM = shift;
    $port = Win32::SerialPort->new($COM) or die "Open Port Failed. $!\n";
    $port->is_rs232;

    # SET UP THE SERIAL PORT
    # 9600 OR 19200, 81N ON THE USB FTDI DRIVER

    $port->initialize();
    $port->baudrate(9600);
    $port->databits(8);
    $port->parity("none");
    $port->stopbits(1);
    $port->write_settings || undef $port;

    return $port;
}

sub close_serial_port {
    $port->purge_all;
    $port->close or die "CLOSE FAILED: $!\n";
    undef $port;    # FREES PORT MEMORY
}

sub is_serial_data_ready {
    # Non-blocking read: otherwise, we'll hang up here!
    my $c = $port->input;

    # Process the incoming characters
    for my $char (split '', $c) {
        if ($char eq "\n" or $char eq "\r") {
            # End of line found, add current line to buffer
            # (unless it's empty)
            if ($serial_input ne '') {
                push @serial_data, $serial_input;
                # start a new blank line
                $serial_input = "";
            }
        }
        else {
            # Just a normal character, add to the input
            $serial_input .= $char;
        }
    }

    # Returns true if there are any completed lines to handle
    return scalar @serial_data;
}

sub handle_serial_data {
    while (my $cmd = shift @serial_data) {
        print colored("Incoming Data:", 'bold green'),
              colored($cmd, 'bold yellow'), "\n";
    }
}