#!/usr/bin/perl 

use v5.030;    # strictness implied
use warnings;
use feature qw[ signatures ];
no warnings qw[ experimental::signatures ];

use Data::Dumper;
use DateTime;
use DateTime::Format::ISO8601;
use DateTime::TimeZone;
use Log::Log4perl;
use Try::Tiny;

our $debug = 0;

my $logger     = init_log();
my $ref_events = init_event();
my @events     = @$ref_events;

my $pi = atan2( 1, 1 ) * 4;
$logger->info("pi is $pi ");
my $redrock = 5200;    #Willsey thumbnail for Bonneville Trail elevati
+on
$logger->info("Bonneville max altitude in feet: $redrock");

## event loop

# Initial previous event to something
my ( $prev_lat, $prev_long ) =
  ( 42, -112 );        #some point in the snake river plain

for my $event (@events) {
  my $epoch = parse_event($event);

## determine altitude

  die unless exists $event->{location};    # restriction
  my $return = get_elevation_from_coordinates( $event->{location}->{la
+t},
    $event->{location}->{lon}, $debug );
  $logger->info(
    " $event->{name} $event->{location}->{lat}  $event->{location}->{l
+on}");

  $logger->info("return from the google is $return meters");
  my $feet = 3.28084 * $return;
  $logger->info("Altitude in feet is $feet");
  my $diff = $redrock - $feet;
  $logger->info("Difference from max Bonneville elevation is $diff ft"
+);
  $logger->info("==============");

  my $d = distance(
    $prev_lat, $prev_long,
    $event->{location}->{lat},
    $event->{location}->{lon}, "M"
  );
  $logger->info("distance is $d miles");
  $logger->info("==============");

  # rotate values
  $prev_lat  = $event->{location}->{lat};
  $prev_long = $event->{location}->{lon};
}
## end event loop

sub init_log {
  {

    package Log::Log4perl;
    sub get_logger ($pkg) { return bless [], $pkg; }

    sub show  (@arg)             { warn @arg, "\n"; }
    sub debug ( $ignore, @rest ) { show( 'DEBUG: ',   @rest ); }
    sub info  ( $ignore, @rest ) { show( 'INFO: ',    @rest ); }
    sub warn  ( $ignore, @rest ) { show( 'WARNING: ', @rest ); }

    sub error ( $ignore, @rest ) { die 'ERROR: ', @rest, "\n"; }
  }

  my $logger2 = Log::Log4perl->get_logger();
  $logger2->info("$0");
  return $logger2;
}

sub init_event {
  my $date_str = "2021-10-14";
  my $time_str = "03:22:31";
  my @events   = (

    {
      "name"     => "Boise",
      "date"     => $date_str,
      "time"     => $time_str,
      "location" => { lon => -116.2, lat => 43.61 },
    },

    {
      "name"     => "near sublett",
      "date"     => $date_str,
      "time"     => $time_str,
      "location" => { lon => -113.2104084, lat => 42.3278114 }
    },
    {
      "name"     => "snowville",
      "date"     => $date_str,
      "time"     => $time_str,
      "location" => { lon => -112.7105234, lat => 41.9655701 },
      42.152429, -112.9842191
    },
    {
      "name"     => "juniper",
      "date"     => $date_str,
      "time"     => $time_str,
      "location" => { lon => -112.9842191, lat => 42.152429 }
    },
    {
      "name"     => "on the outcrop",
      "date"     => $date_str,
      "time"     => $time_str,
      "location" => { lon => -111.7849951, lat => 40.703684, },
    },
    {
      "name"     => "Cascade way",
      "date"     => $date_str,
      "time"     => $time_str,
      "location" => { lon => -111.7941259, lat => 40.7062734 },
    },

    {
      "name"     => "Mantua",
      "date"     => $date_str,
      "time"     => $time_str,
      "location" => { lon => -111.944728, lat => 41.5073303 },
    },
        {
      "name"     => "dry creek",
      "date"     => $date_str,
      "time"     => $time_str,
      "location" => { lon => -111.9537977, lat => 41.5501001 },
    },
    {
      "name"     => "wellsville",
      "date"     => $date_str,
      "time"     => $time_str,
      "location" => { lon => -111.9288947, lat => 41.6365147 },
    },

  );
  return \@events;

}

sub event2str {
  my $event = shift;

  if ( !exists $event->{_is_parsed} ) {
    warn "event has not been parsed, just dumping it...";
    print Dump($event);
  }
  my $str =
      $event->{name} . " on "
    . $event->{datetime} . " ("
    . $event->{datetime}->epoch
    . " seconds unix-epoch)"
    . " timezone: "
    . $event->{datetime}->time_zone->name;
  if ( exists $event->{location} ) {
    if ( ref( $event->{location} ) eq 'HASH' ) {
      $str .=
          " (lat: "
        . $event->{location}->{lat}
        . ", lon: "
        . $event->{location}->{lon} . ")";
    }
    else { $str .= "(" . $event->{location} . ")" }
  }
  return $str;
}

sub parse_event {
  my $event = shift;

  $debug //= 0;
  if ( !exists $event->{date} ) { die "date field is missing from even
+t." }

  my $datestr = $event->{date};

  die "event does not have a 'name' field, please specify one, anythin
+g really."
    unless exists $event->{name};

  my $timestr = "00:00:01";
  if ( exists $event->{time} ) {
    $timestr = $event->{time};
    print "event2epoch(): setting time to '$timestr' ...\n"
      if $debug > 0;
    die "time '$timestr' is not valid, it must be in the form 'hh:mm:s
+s'."
      unless $timestr =~ /^\d{2}:\d{2}:\d{2}$/;
  }
  else { $event->{time} = $timestr }

  my $isostr = $datestr . 'T' . $timestr;
  my $dt     = DateTime::Format::ISO8601->parse_datetime($isostr);
  die "failed to parse date '$isostr', check date and time fields."
    unless defined $dt;
  $event->{datetime} = $dt;

  my $tzstr = 'UTC';
  if ( exists $event->{timezone} ) {
    $tzstr = $event->{timezone};
    print
"event2epoch(): found a timezone via 'timezone' field as '$tzstr' (tha
+t does not mean it is valid) ...\n"
      if $debug > 0;
  }
  elsif ( exists $event->{location} ) {
    my $loc = $event->{location};
    if ( ( ref($loc) eq '' ) && ( $loc =~ /^[a-zA-Z]$/ ) ) {

      # we have a location string
      my @alltzs = DateTime::TimeZone->all_names;
      my $tzstr;
      for (@alltzs) {
        if ( $_ =~ /$loc/i ) { $tzstr = $_; last }
      }
      die
"event's location can not be converted to a timezone, consider specify
+ing the 'timezone' directly or setting 'location' coordinates with: \
+[lat,lon\]."
        unless $tzstr;
      print
"event2epoch(): setting timezone via 'location' name to '$timestr' ...
+\n"
        if $debug > 0;
    }
    elsif ( ( ref($loc) eq 'HASH' )
      && ( exists $loc->{lat} )
      && ( exists $loc->{lon} ) )
    {
      # we have a [lat,lon] array for location
      require Geo::Location::TimeZone;
      my $gltzobj = Geo::Location::TimeZone->new();
      $tzstr = $gltzobj->lookup( lat => $loc->{lat}, lon => $loc->{lon
+} );
      if ( !$tzstr ) {
        die "timezone lookup from location coordinates lat:"
          . $loc->{lat}
          . ", lon:"
          . $loc->{lon}
          . " has failed.";
      }
      print "event2epoch(): setting timezone via 'location' coordinate
+s lat:"
        . $loc->{lat}
        . ", lon:"
        . $loc->{lon}
        . " ...\n"
        if $debug > 0;
    }
  }
  if ($tzstr) {
    print "event2epoch(): deduced timezone to '$tzstr' and setting it 
+...\n"
      if $debug > 0;
    try {
      $dt->set_time_zone($tzstr)
    }
    catch {
      die "$_\n failed to set the timezone '$tzstr', is it valid?"
    }
  }

  $event->{_is_parsed} = 1;
  $event->{epoch}      = $dt->epoch;
  return $event->{epoch};
}

sub get_elevation_from_coordinates {
  my ( $lat, $lon, $debug ) = @_;

  use LWP::UserAgent;
  use HTTP::Request;
  use Data::Roundtrip;

  $debug //= 0;

  my $ua = LWP::UserAgent->new( agent =>
      'Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox
+/78.0', );

  my $response;
  my $payload =
      'latitude='
    . $lat
    . '&longitude='
    . $lon
    . '&application_max_assets_mtime=1559625591';
  my $payloadlen = length($payload);

  # this request was translated from Curl command-line
  # by [Corion]'s https://corion.net/curl2lwp.psgi
  my $req = HTTP::Request->new(
    'POST' =>
'https://www.mapcoordinates.net/admin/component/edit/Vpc_MapCoordinate
+s_Advanced_GoogleMapCoords_Component/Component/json-get-elevation',
    [
      'Connection'      => 'keep-alive',
      'Accept'          => '*/*',
      'Accept-Encoding' => 'gzip, x-gzip, deflate, x-bzip2, bzip2',
      'Accept-Language' => 'en-US,en;q=0.5',

      #        'Host'            => 'www.mapcoordinates.net:443',
      'Referer'    => 'https://www.mapcoordinates.net/en',
      'User-Agent' =>
        'Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firef
+ox/78.0',
      'Content-Length'   => $payloadlen,
      'Content-Type'     => 'application/x-www-form-urlencoded; charse
+t=UTF-8',
      'DNT'              => '1',
      'Origin'           => 'https://www.mapcoordinates.net',
      'X-Requested-With' => 'XMLHttpRequest'
    ],
    $payload
  );
  die "call to HTTP::Request has failed" unless $req;

  if ( $debug > 0 ) {

    $logger->debug(
      "$0 : $payload\n$0 : sending above payload, of $payloadlen bytes
+...");
  }

  $response = $ua->request($req);
  die "Error fetching: " . $response->status_line
    unless $response->is_success;

  my $content = $response->decoded_content;
  my $data    = Data::Roundtrip::json2perl($content);
  die "failed to parse received data:\n$content\n"
    unless exists $data->{'elevation'};

  return $data->{'elevation'};
}

sub distance {
  my ( $lat1, $lon1, $lat2, $lon2, $unit ) = @_;
  if ( ( $lat1 == $lat2 ) && ( $lon1 == $lon2 ) ) {
    return 0;
  }
  else {
    my $theta = $lon1 - $lon2;
    my $dist  = sin( deg2rad($lat1) ) * sin( deg2rad($lat2) ) +
      cos( deg2rad($lat1) ) * cos( deg2rad($lat2) ) * cos( deg2rad($th
+eta) );
    $dist = acos($dist);
    $dist = rad2deg($dist);
    $dist = $dist * 60 * 1.1515;
    if ( $unit eq "K" ) {
      $dist = $dist * 1.609344;
    }
    elsif ( $unit eq "N" ) {
      $dist = $dist * 0.8684;
    }
    return ($dist);
  }
}

#:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+:
#:::  This function get the arccos function using arctan function   ::
+:
#:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+:
sub acos {
  my ($rad) = @_;
  my $ret = atan2( sqrt( 1 - $rad**2 ), $rad );
  return $ret;
}

#:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+:
#:::  This function converts decimal degrees to radians             ::
+:
#:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+:
sub deg2rad {
  my ($deg) = @_;
  return ( $deg * $pi / 180 );
}

#:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+:
#:::  This function converts radians to decimal degrees             ::
+:
#:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+:
sub rad2deg {
  my ($rad) = @_;
  return ( $rad * 180 / $pi );
}

__END__
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