#!/usr/bin/perl -w
use strict;
use warnings;
use Math::Trig;
use JSON;

my @path = split("/", $0);
pop @path;
my $p = join("/", @path);
my $config_file = -e '~/.location.json' ? '~/.location.json' : 'location_example.json';

# Load up config data
open (CONFIG, $config_file) or goto NOCONFIG;
my $raw_config = "";
while (<CONFIG>) { $raw_config .= $_; }
my %config = %{decode_json($raw_config)};
close(CONFIG);

NOCONFIG:
my $lat = $config{lat} or scalar(40.48967);
my $lon = $config{lon} or scalar(-111.93882);
my $WB_providerID = $config{WBproviderID} or scalar(23);
my $WB_stationID = $config{WBstationID} or scalar("C3430");
my $WU_stationID = $config{WUstationID} or scalar("KUTRIVER63");
my $city = $config{city} or scalar("bluffdale");

sub checksources {
	my $weather = (`$p/wttrin.sh $city` || `$p/weatherunder.sh $WU_stationID` || `$p/weatherbug.sh $lat $lon $WB_providerID $WB_stationID` || `$p/weathergov.sh $lat $lon`) or print "Not Available\n\n#FF0000" and exit 33;
	return $weather;
}

sub wavegen {
        my $x = shift;
        my $period = shift;
        my $phaseshift = shift;
        my $magnitude = shift;
        my $y_adjust = shift;
        return sin($x/($period/pi)+$phaseshift)*$magnitude+$y_adjust;
}

sub hexcolor {
        my ($temp,$cold,$hot,$rwave,$gwave,$bwave) = @_;
        my $temp_gauge = ($temp - $cold)/($hot - $cold)*100;

	my $r = (100 * sin($temp_gauge / 10)) + ($temp_gauge - 30) * 2;
	my $g = ($temp_gauge - 50) * ($temp_gauge - 75) * (0 - 1) / 10 + 100;
	my $b = ($temp_gauge - 25) * ($temp_gauge - 25) * (0 - 1) / 5 + 100;
	
	$r *= 2;
	$g *= 2;
	$b *= 2;

	#brightness
	my $brightness = 270; #out of a max of 768 (white)

        #sanitize
        $r = $r > 0 ? $r : 0;
        $g = $g > 0 ? $g : 0;
        $b = $b > 0 ? $b : 0;
	$r = $r < 255 ? $r : 255;
	$g = $g < 255 ? $g : 255;
	$b = $b < 255 ? $b : 255;

	if ($r+$g+$b < $brightness) {
		$brightness -= ($r+$g+$b);
		$r += ($brightness/3);
		$g += ($brightness/3);
		$b += ($brightness/3);
	}

        if ($rwave) { $r = $rwave }
        if ($gwave) { $g = $gwave }
        if ($bwave) { $b = $bwave }

        my $CR = unpack("H2",pack("I",$r));
        my $CG = unpack("H2",pack("I",$g));
        my $CB = unpack("H2",pack("I",$b));

        return "#".$CR.$CG.$CB;
}

sub getdir {
	my $degree = shift;
	if ($degree <= 22 ) { return "↑";}
	if ($degree <= 67 ) { return "↗";}
	if ($degree <= 112 ) { return "→";}
	if ($degree <= 157 ) { return "↘";}
	if ($degree <= 202 ) { return "↓";}
	if ($degree <= 247 ) { return "↙";}
	if ($degree <= 292 ) { return "←";}
	if ($degree <= 337 ) { return "↖";}
	return "↑";
}

my @weather = split(":",checksources) or print "Not Available\n\n#FF0000" and exit 33;

my $type = $weather[0];
my $temp = sprintf("%.0f", ($weather[1] - 32) * (5/9) ); #converts  from F to C
my $wind = $weather[2];
my $wdir = getdir($weather[3]);

my $color = hexcolor($temp,-17,42);

if($type =~ /Rain/) {$type = "";}
elsif ($type =~ /Overcast/) {$type = "";}
elsif ($type =~ /cloud/) {$type = "";}
elsif ($type =~ /Clear/) {$type = "";}
elsif ($type =~ /Sun/) {$type = "";}
elsif ($type eq "NA") {$type = "";}
elsif ($type =~ /Snow/) {$type = "";}
else {$type=$type."...";}

my $loc = substr(($weather[4] or "?????"), 0, 5);

my $format = '%5.5s - %5.5s   %03dC   %s %03dmph';
printf( $format, $loc, $type, $temp, $wdir, $wind);
print "\n";
printf( $format, $loc, $type, $temp, $wdir, $wind);
print "\n";
print $color."\n";