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package main;
my $fetcher = FlickrFetcher->new_with_options();
$fetcher->run();

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package FlickrFetcher;
use Moose;
use Moose::Util::TypeConstraints;
use Params::Coerce ();
use Digest::MD5 qw(md5_hex);
use Encode;
use LWP::UserAgent;
use Path::Class;
use POSIX qw(ceil);
use WebService::Simple;
use WebService::Simple::Parser::XML::Simple;
use XML::Simple;
use Perl6::Say;

our $VERSION = '0.01';
with 'MooseX::Getopt';

subtype 'Dir' => as 'Object' => where { $_->isa('Path::Class::Dir') };
coerce 'Dir'  => from 'Str'  => via   { Path::Class::Dir->new($_) };
MooseX::Getopt::OptionTypeMap->add_option_type_to_map('Dir' => '=s');

has 'keyword'  => (is => 'rw', isa => 'Str', required => 1);
has 'dir'      => (is => 'rw', isa => 'Dir', required => 1, coerce => 1);
has 'api_key'  => (is => 'rw', isa => 'Str');
has 'license'  => (is => 'rw', isa => 'Int');
has '_perpage' => (is => 'ro', isa => 'Int', default => 500);
has '_flickr'  => (is => 'rw', isa => 'WebService::Simple');
has '_ua'      => (
    is      => 'ro',
    isa     => 'LWP::UserAgent',
    default => sub { LWP::UserAgent->new(keep_alive => 1) }
);

sub BUILD {
    my ($self, $args) = @_;
    unless ($self->api_key) {
        if (my $api_key = $ENV{FLICKR_API_KEY}) {
            $self->api_key($api_key);
        } else {
            die "api_key is required\n";
        }
    }
    my $xs = XML::Simple->new(KeepRoot => 1, keyattr => []);
    my $parser = WebService::Simple::Parser::XML::Simple->new(xs => $xs);
    my $flickr = WebService::Simple->new(
        base_url        => "http://api.flickr.com/services/rest/",
        param           => { api_key => $self->api_key },
        response_parser => $parser,
    );
    $self->_flickr($flickr);
}

__PACKAGE__->meta->make_immutable;
no Moose;

sub run {
    my $self = shift;
    mkdir $self->dir->relative if !-d $self->dir->is_absolute;
    say "search keyword : " . $self->keyword;
    my $photo_total = $self->photo_total($self->keyword);
    say "total count : " . $photo_total;
    my $pages = ceil($photo_total / $self->_perpage);
    for my $current_page (1 .. $pages) {
        say "search page : $current_page";
        $self->search($self->keyword, $current_page, $self->_perpage);
    }
}

sub search {
    my ($self, $keyword, $page, $perpage) = @_;
    my $response = $self->_flickr->get(
        {
            method   => "flickr.photos.search",
            text     => $keyword,
            per_page => $perpage,
            sort     => 'date-posted-desc',
            extras   => 'date_upload',
            page     => $page,
            license  => $self->license || "",
        }
    );
    my $xml = $response->parse_response;
    $self->fetch($xml->{rsp}->{photos}->{photo});
}

sub fetch {
    my ($self, $photo_ref) = @_;
    $photo_ref = ref $photo_ref eq 'ARRAY' ? $photo_ref : [$photo_ref]; # 要素が一つのとき対策
    for my $photo (@$photo_ref) {
        my $url  = $self->photo_url($photo->{id});
        my $file = $self->dir->file(md5_hex($url) . ".jpg");
        my $res;
        eval { $res = $self->_ua->mirror($url, $file); }; # 「Transfer truncated」対策。ここから
        if ($@) {
            say $@;
        } else {
            say "try to fetch : " . $res->status_line . " : $url";
        } # ここまで
    }
}

sub photo_url {
    my ($self, $photo_id) = @_;
    my $response = $self->_flickr->get(
        {
            method   => "flickr.photos.getSizes",
            photo_id => $photo_id
        }
    );
    my $xml         = $response->parse_response;
    my $largest_ref = pop @{$xml->{rsp}->{sizes}->{size}};
    return $largest_ref->{source};
}

sub photo_total {
    my ($self, $keyword) = @_;
    my $response = $self->_flickr->get(
        {
            method   => "flickr.photos.search",
            text     => $keyword,
            per_page => 1,
            license  => $self->license || "",
        }
    );
    my $xml = $response->parse_response;
    return $xml->{rsp}->{photos}->{total};
}

1;

__END__

=head1 NAME
flickr_fetcher.pl - Fetch Flickr photos by keyword

=head1 SYNOPSIS
./flickr_fetcher.pl --keyword hoge --dir hoge --api_key yourflickrapikey

=head1 AUTHOR
Yusuke Wada E<lt>yusuke (at) kamawada.comE<gt>

=head1 LICENSE
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

=cut

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#!/usr/bin/perl
# utf8
use strict;
use warnings;
use FlickrFetcher;
fetch({
    keyword => '石原さとみ',
    dir     => 'satomi_ishihara',
});
sub fetch {
    my $rh_arg = shift;
    my $fetcher = FlickrFetcher->new_with_options(%{$rh_arg});
    $fetcher->run();
}