package Brownie::Node::Mechanize;

use strict;
use warnings;
use parent 'Brownie::Node';
use Carp ();

sub _find_outer_link {
    my $self = shift;

    my @links = $self->native->look_up(sub {
        return lc($_[0]->tag) eq 'a' && $_[0]->attr('href');
    });

    return @links ? $links[0]->attr('href') : '';
}

sub _find_select_selector {
    my $self = shift;

    my ($select) = $self->native->look_up(sub {
        return lc($_[0]->tag) eq 'select' && ($_[0]->attr('id') || $_[0]->attr('name'));
    });

    return unless $select;

    if (my $id = $select->attr('id')) {
        return '#'.$id;
    }
    elsif (my $name = $select->attr('name')) {
        return '^'.$name;
    }
}

sub _is_text_field {
    my $self = shift;
    return 1 if $self->tag_name eq 'textarea';
    return 1 if $self->tag_name eq 'input' && ($self->type =~ /^(?:text|password|file|hidden)$/i || !$self->type);
    return 0;
}

sub _is_button {
    my $self = shift;
    return 1 if $self->tag_name eq 'input'  && $self->type =~ /^(?:submit|image)$/i;
    return 1 if $self->tag_name eq 'button' && (!$self->type || $self->type eq 'submit');
    return 0;
}

sub _is_checkbox {
    my $self = shift;
    return $self->tag_name eq 'input' && $self->type eq 'checkbox';
}

sub _is_radio {
    my $self = shift;
    return $self->tag_name eq 'input' && $self->type eq 'radio';
}

sub _is_option {
    my $self = shift;
    return $self->tag_name eq 'option';
}

sub _is_in_multiple_select {
    my $self = shift;

    return $self->native->look_up(sub {
        return lc($_[0]->tag) eq 'select' && $_[0]->attr('multiple');
    });
}

sub _is_form_control {
    my $self = shift;
    return $self->_is_text_field
        || $self->_is_button
        || $self->_is_checkbox
        || $self->_is_radio
        || $self->_is_option;
}

sub attr {
    my ($self, $name) = @_;
    return $self->native->attr($name) || '';
}

sub text {
    my $self = shift;
    return $self->native->as_text;
}

sub tag_name {
    my $self = shift;
    return lc $self->native->tag;
}

sub _mech { return shift->driver->browser }

sub _mech_selector {
    my $self = shift;

    my $selector = '';
    if (my $id = $self->id) {
        $selector = "#$id";
    }
    elsif (my $name = $self->name) {
        $selector = "^$name";
    }

    return $selector;
}

sub is_displayed { !shift->is_not_displayed }

sub is_not_displayed {
    my $self = shift;

    my @hidden = $self->native->look_up(sub {
        return 1 if lc($_[0]->attr('style') || '') =~ /display\s*:\s*none/;
        return 1 if lc($_[0]->tag) eq 'script' || lc($_[0]->tag) eq 'head';
        return 1 if lc($_[0]->tag) eq 'input' && lc($_[0]->attr('type') || '') eq 'hidden';
        return 0;
    });

    return scalar(@hidden) > 0;
}

sub is_selected {
    my $self = shift;
    return $self->attr('selected') || $self->attr('checked');
}

*is_checked = \&is_selected;

sub set {
    my ($self, $value) = @_;

    if ($self->_is_text_field) {
        $self->_mech->field($self->_mech_selector, $value);
    }
    elsif ($self->_is_checkbox || $self->_is_radio || $self->_is_option) {
        $self->select;
    }
    else {
        Carp::carp("This element is not a form control.");
    }
}

sub select {
    my $self = shift;

    if ($self->_is_checkbox) {
        $self->_mech->tick($self->_mech_selector, $self->value);
        $self->native->attr(checked => 'checked');
    }
    elsif ($self->_is_radio) {
        $self->_mech->set_visible([ radio => $self->value ]);
        $self->native->attr(selected => 'selected');
    }
    elsif ($self->_is_option) {
        # TODO: multiple
        my $selector = $self->_find_select_selector;
        if ($selector) {
            $self->_mech->select($selector, $self->value);
            $self->native->attr(selected => 'selected');
        }
    }
    else {
        Carp::carp("This element is not selectable.");
    }
}

sub unselect {
    my $self = shift;

    if ($self->_is_checkbox) {
        $self->_mech->untick($self->_mech_selector, $self->value);
        $self->native->attr(checked => '');
    }
    elsif ($self->_is_option && $self->_is_in_multiple_select) {
        my $selector = $self->_find_select_selector;
        if ($selector) {
            $self->_mech->field($selector, undef);
            $self->native->attr(selected => '');
        }
    }
    else {
        Carp::carp("This element is not selectable.");
    }
}

sub click {
    my $self = shift;

    if ($self->_is_form_control) {
        if ($self->_is_button) {
            my %args = $self->name ? (name => $self->name) : (value => $self->value);
            $self->_mech->click_button(%args);
        }
        elsif ($self->_is_checkbox || $self->_is_option) {
            $self->is_checked ? $self->unselect : $self->select;
        }
        elsif ($self->_is_radio) {
            $self->select;
        }
        else {
            Carp::carp("This element is not a clickable control.");
        }
    }
    elsif (my $link = $self->_find_outer_link) {
        $self->_mech->follow_link(url => $link);
    }
    else {
        Carp::carp("This element is not clickable.");
    }
}

1;

=head1 NAME

Brownie::Node::Mechanize - base class of Brownie::Node series

=head1 METHODS

=over 4

=item * C<new(%args)>

=item * C<driver>

=item * C<native>

=item * C<attr($name)>

=item * C<id>

=item * C<name>

=item * C<type>

=item * C<value>

=item * C<text>

=item * C<tag_name>

=item * C<is_displayed>

=item * C<is_checked>

=item * C<is_selected>

=item * C<is_not_displayed>

=item * C<is_not_checked>

=item * C<is_not_selected>

=item * C<set($value)>

=item * C<select>

=item * C<unselect>

=item * C<click>

=item * C<find($locator)>

=item * C<first($locator)>

=item * C<all($locator)>

=back

=head1 AUTHOR

NAKAGAWA Masaki E<lt>masaki@cpan.orgE<gt>

=head1 LICENSE

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

=head1 SEE ALSO

L<Brownie::Node>, L<Brownie::Driver>, L<Brownie::Driver::Mechanize>

L<HTML::Element>, L<WWW::Mechanize>

=cut