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#!/usr/bin/perl
#
# Check to see if a track violates airspace
#
# Needs to be quick/pruned somehow?
# Only check if 'nearby' / every 30 seconds?
# 
# Geoff Wong 2008
#

require DBD::mysql;

use Math::Trig;
use Data::Dumper;
use POSIX qw(ceil floor);
use TrackLib qw(:all);

my $dbh;

#
# Read an abbreviated tracklog from the database 
#
sub read_short_track
{
    my ($traPk) = @_;
    my %track;
    my @coords;
    my %awards;
    my $ref;
    my $c1;

    $sth = $dbh->prepare("select *, floor(trlTime/60) as trlMinTime, max(trlAltitude) as maxAlt from tblTrackLog where traPk=$traPk group by floor(trlTime/60) order by trlTime");
    $sth->execute();
    while ($ref = $sth->fetchrow_hashref()) 
    {
        #print "Found a row: time = $ref->{'trlTime'}\n";
        my %coord;

        $coord{'dlat'} = $ref->{'trlLatDecimal'};
        $coord{'dlong'} = $ref->{'trlLongDecimal'};

        # radians
        $coord{'lat'} = $ref->{'trlLatDecimal'} * $pi / 180;
        $coord{'long'} = $ref->{'trlLongDecimal'} * $pi / 180;

        # alt / time  / pressure?
        $coord{'alt'} = $ref->{'maxAlt'};
        $coord{'time'} = $ref->{'trlTime'};

        # and cartesian ..
        $c1 = polar2cartesian(\%coord);
        $coord{'cart'} = $c1;

        push @coords, \%coord;
    }

    $track{'coords'} = \@coords;

    return \%track;
}

sub airspace_check
{
    my ($traPk, $airspaces) = @_;
    my $flight;
    my $violation;

    $violation = 0;
    $flight = read_short_track($traPk);
    $full = $flight->{'coords'};

    foreach $space (@$airspaces)
    {
        print "Checking airspace ", $space->{'name'}, " with base=", $space->{'base'}, "\n";
        #print Dumper($space);

        for my $coord ( @$full )
        {
            # add dist check on centre of space too ...distance($coord, $space->{'centre'}) < $space->{'radius'}
            #print "check ", $space->{'name'}, "\n";
            # stupid 10000ft check for oz pilots
            if ($coord->{'alt'} > 3048)
            {
                if ($coord->{'alt'} - $space->{'base'} > $violation)
                {
                    $violation = $coord->{'alt'} - 3048;
                }
            }
            if ($coord->{'alt'} > $space->{'base'})
            { 
                # potential violation ..
                if (in_polygon($coord, $space->{'points'}))
                {
                    if ($coord->{'alt'} - $space->{'base'} > $violation)
                    {
                        print "PV:  alt=", $coord->{'alt'}, " dlat=", $coord->{'dlat'}, " dlong=", $coord->{'dlong'}, "\n";
                        $violation = $coord->{'alt'} - $space->{'base'};
                    }
                }
            }
        }
    }
    return $violation;
}

#int nvert, float *vertx, float *verty, float testx, float testy)
#  for (i = 0, j = nvert-1; i < nvert; j = i++) 
#  {
#    if ( ((verty[i]>$wpt->{'y'}) != (verty[j]>$wpt->{'y'})) &&
#     (testx < (vertx[j]-vertx[i]) * (testy-verty[i]) / (verty[j]-verty[i]) + vertx[i]) )
#       c = !c;
#
#      for (i = 0, j = npol-1; i < npol; j = i++) {
#        if ((((yp[i] <= y) && (y < yp[j])) ||
#             ((yp[j] <= y) && (y < yp[i]))) &&
#            (x < (xp[j] - xp[i]) * (y - yp[i]) / (yp[j] - yp[i]) + xp[i]))
#          c = !c;
#      }

sub in_polygon
{
    my ($wpt, $poly) = @_;
    my ($i, $j);
    my $c = 0;
    my $nvert;

    $nvert = scalar @$poly;

#    print "wpt=", Dumper($wpt);
#    print "poly=", Dumper($poly);

    for ($i = 0, $j = $nvert-1; $i < $nvert; $j = $i++) 
    {
#        if ( (($poly->[$i]->{'cart'}->{'y'} > $wpt->{'cart'}->{'y'}) 
#                != ($poly->[$j]->{'cart'}->{'y'} > $wpt->{'cart'}->{'y'})) &&
#            ($wpt->{'cart'}->{'x'} < ($poly->[$j]->{'cart'}->{'x'}-$poly->[$i]->{'cart'}->{'x'}) * ($wpt->{'cart'}->{'y'} - $poly->[$i]->{'cart'}->{'y'}) / 
#            ($poly->[$j]->{'cart'}->{'y'} - $poly->[$i]->{'cart'}->{'y'}) + $poly->[$i]->{'cart'}->{'x'}) )
        if (( (($poly->[$i]->{'cart'}->{'y'} <= $wpt->{'cart'}->{'y'}) &&
               ($wpt->{'cart'}->{'y'} < $poly->[$j]->{'cart'}->{'y'})) ||
              (($poly->[$j]->{'cart'}->{'y'} <= $wpt->{'cart'}->{'y'}) &&
               ($wpt->{'cart'}->{'y'} < $poly->[$i]->{'cart'}->{'y'}))) &&
               ($wpt->{'cart'}->{'x'} < ($poly->[$j]->{'cart'}->{'x'} -
                    $poly->[$i]->{'cart'}->{'x'}) * ($wpt->{'cart'}->{'y'} -
                $poly->[$i]->{'cart'}->{'y'}) / 
                ($poly->[$j]->{'cart'}->{'y'} - $poly->[$i]->{'cart'}->{'y'}) + $poly->[$i]->{'cart'}->{'x'}) )
        {
            #print "cross\n";
            $c++;
        }
    }

    return ($c % 2);
}

#
# Returns a list of airspace that is centred 'near' the track  
# within traDistance+XXX)
#
sub find_nearby_airspace
{
    my ($regPk, $dist) = @_;
    my @allair;
    my ($sth,$ref);
    my %nearair;
    my $airPk;
    my @points;

    # Get regPk centre ...
    #$sth = $dbh->prepare("select * from tblAirspace A, tblAirspaceWaypoint AW where A.airCentreWP = AW.awpPk and AW.awpLatDecimal between (X,Y) and AW.awpLonDecimal between (X,Y)");

    # Get it all for now ...
    $sth = $dbh->prepare("select * from tblAirspace A, tblAirspaceWaypoint AW where A.airPk=AW.airPk order by A.airPk,AW.airOrder");

    $sth->execute();
    $airPk = 0;
    while ($ref = $sth->fetchrow_hashref())
    {
        my %coord;

        if ($ref->{'airPk'} != $airPk)
        {
            if ($airPk == 0)
            {
                $airPk = $ref->{'airPk'};
            }
            else
            {
                my @pts;
                my %na;
                @pts = @points;
                $nearair{'points'} = \@pts;
                %na = %nearair;
                push @allair, \%na;
                @points = ();
                %nearair = ();
                $airPk = $ref->{'airPk'};

            }
        }

        $nearair{'name'} = $ref->{'airName'};
        $nearair{'class'} = $ref->{'airClass'};
        $nearair{'base'} = $ref->{'airBase'};
        $nearair{'tops'} = $ref->{'airTops'};

        $coord{'dlat'} = $ref->{'awpLatDecimal'};
        $coord{'dlong'} = $ref->{'awpLongDecimal'};
        $coord{'lat'} = $ref->{'awpLatDecimal'} * $pi / 180;
        $coord{'long'} = $ref->{'awpLongDecimal'} * $pi / 180;
        $coord{'cart'} = polar2cartesian(\%coord);
        #print "coord=",Dumper($coord), "\n";

        push @points, \%coord;
    }

    $nearair{'points'} = \@points;
    push @allair, \%nearair;

    return \@allair;
}

sub get_all_tracks
{
    my ($tasPk) = @_;
    my ($sth,$ref);
    my %ret;

    $sth = $dbh->prepare("select CTT.traPk, P.* from tblComTaskTrack CTT, tblTrack T, tblPilot P where CTT.traPk=T.traPk and P.pilPk=T.pilPk and CTT.tasPk=$tasPk");
    $sth->execute();
    while ($ref = $sth->fetchrow_hashref())
    {
        $ret{$ref->{'traPk'}} = $ref;
    }

    return \%ret;
}

#
# Verify an entire task ...
#

my $tasPk = 0 + $ARGV[0];
my $tracks;
my $airspace;
my $dist;
my $name;

$dbh = db_connect();
$tracks = get_all_tracks($tasPk);
#$tracks = [ 821, 823, 865 ];
$airspace = find_nearby_airspace($regPk, 100000.0);
#print Dumper($airspace);

# Go through all the tracks ..
# might be more useful to print the names :-)
for my $track (keys %$tracks)
{
    print "Airspace check for track: $track\n";
    $dist = 0;
    $name = $tracks->{$track}->{'pilFirstName'} . " " . $tracks->{$track}->{'pilLastName'};
    if (($dist = airspace_check($track,$airspace)) > 0)
    {
        print "   Maximum violation of $dist metres ($name).\n";
    }
    else
    {
        print "   No violation ($name).\n";
    }
}