#!/usr/bin/perl

use warnings;
use strict;

use IO::All;
use WWW::Mechanize;

{
    my @addrs = @ARGV;
    if ( scalar @addrs < 2 ) {
        print "You have " . scalar @addrs . " addresses. " .
              "Need 2 or more.  Enter 'done<return>' to finish\n";
        while ( <> ) {
            last if $_ eq "done\n";
            push @addrs, $_;
        } 
        die help () if scalar @addrs < 2;
        chomp @addrs;
    }

    @addrs = process_addresses ( @addrs );

    foreach ( 0 .. scalar @addrs - 2 ) {
        my $trip_leg_page = get_trip_leg_page ( [ $addrs[$_], $addrs[$_+1] ] );
        io ( "trip_leg_" . ($_+1) . ".html" )->print ( $trip_leg_page );
    }
}

sub process_addresses {
    my @addrs = @_;
    foreach ( @addrs ) {
        # Count commas, split the line into an anonymous 
        #   array w/ $count elems
        my $count = $_ =~ tr/,/,/;
        $_ = [ split ( /\s*,\s*/, $_, $count ) ];
        # add a null if it's just city/state:
        unshift @$_, "" if 1 == $count; 
    }
    return @addrs;
}

sub get_trip_leg_page {
    my ( $addr_pair ) = @_;

    my $mech = WWW::Mechanize->new ();
    $mech->get ( 'http://maps.yahoo.com/dd' );
    my $resp = $mech->submit_form (
        form_name => 'dd',
        fields => {
            addr  => $addr_pair->[0][0],
            csz   => $addr_pair->[0][1],
            taddr => $addr_pair->[1][0],
            tcsz  => $addr_pair->[1][1],
        },
    );
    die "Form submission failure: $!" if not $mech->success ();
    return $resp->{_content}
}

sub help {
    print << "    EOF";
    usage: multimap "31 Kinnaird St, Cambridge, MA" \
                    "27 Hall St, Somerville, MA" \
                    "60 Garden St, Cambridge, MA"
    EOF
}