#!/usr/bin/perl -w
use strict;
use warnings;
use XML::FeedPP;
use HTML::TreeBuilder::XPath;

# input
my $source = 'http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/4.5_day.atom'; 

# output
my $outfile = "quake.txt";
open my $fh,">",$outfile or die "$!";

# process
report_header();

my $feed = XML::FeedPP->new( $source );
foreach my $quake( $feed->get_item() ) {   
  
  my $title     = $quake->get('title');
  my $magnitude = substr($title,2,3); 
  my $place     = substr($title,8);
  my $updated = $quake->get('updated');  
  my $locn    = $quake->get('georss:point');
  my $summary = $quake->get('summary');
  my $id      = $quake->get('id');
  
   # extract time from summary using XPath  
  my $tree = HTML::TreeBuilder::XPath->new_from_content($summary);
  my @dd = $tree->findvalues('//dd');
  
  # extract time using regex
  my $t1;
  my $t2;
  if ($summary =~ m!<dt>Time</dt>
  <dd>(.*)\ UTC</dd>
  <dd>(.*)\ at\ epicenter</dd>!x){
    $t1 = $1;
    $t2 = $2;
  }
  
  print $fh <<EOF
  ID        : $id
  Title     : $title
  Place     : $place
  Magnitude : $magnitude
  Updated   : $updated
  Location  : $locn
  Summary   : $summary
  
  Time Xpath: $dd[0]
              $dd[1]  
  Time regex: $t1 
            : $t2  

EOF
}
close $fh;

sub report_header {
  my $cur_time = localtime;
  print $fh <<EOF
  # This Quake file created by quake_parsing_9
  # Matt Coblentz; Perl version unknown
  # For more information, see the USGS website
  # Last Updated: $cur_time
  
EOF
}