# Selima Website Content Management System
# ListPref.pm: The list preference data processor.

#  Copyright (c) 2006-2018 imacat.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

# Author: imacat <imacat@mail.imacat.idv.tw>
# First written: 2006-03-22

package Selima::Processor::ListPref;
use 5.008;
use strict;
use warnings;
use base qw(Selima::Processor);

use CGI;

use Selima::DataVars qw($DBH :dataman :input);
use Selima::Guest;
use Selima::LogIn;
use Selima::UserPref;

# Load these classes
use Selima::Processor::UserPref;

# new: Initialize the processor
sub new : method {
    local ($_, %_);
    my ($self, $class);
    ($class, @_) = @_;
    $self = $class->SUPER::new(@_);
    $self->{"is_sql"} = 0 if is_guest;
    $self->{"names"} = [qw(listsize listcols)];
    return $self;
}

# process: Process the form, fully
sub process : method {
    local ($_, %_);
    my ($self, $form);
    ($self, @_) = @_;
    # Use the parent processor for ordinary users
    return $self->SUPER::process(@_) unless is_guest;
    
    # Guest preferences are saved in $SESSION
    $form = $self->{"form"};
    $$SESSION{"userpref"} = {}
        if !exists $$SESSION{"userpref"};
    ${$$SESSION{"userpref"}}{$form->param("domain")} = {}
        if !exists ${$$SESSION{"userpref"}}{$form->param("domain")};
    $_ = ${$$SESSION{"userpref"}}{$form->param("domain")};
    
    foreach my $name (@{$self->{"names"}}) {
        $$_{$name} = $form->param($name);
    }
    return;
}

# _save_cols: Save the column deposit
sub _save_cols : method {
    local ($_, %_);
    my ($self, $form);
    $self = $_[0];
    $form = $self->{"form"};
    
    foreach my $name (@{$self->{"names"}}) {
        my ($val, $sql, $sth, $row, $sn, $cols, $subform);
        # Obtain the preference value
        $val = $self->_prefval($name);
        # Only update if value is different
        $_ = userpref $name, $form->param("domain");
        next if defined $_ && $_ eq $val;
        
        # Check if there is already an existing user preference
        $sql = "SELECT * FROM userpref"
            . " WHERE usr=" . get_login_sn
            . " AND domain=" . $DBH->quote($form->param("domain"))
            . " AND name=" . $DBH->quote($name) . ";\n";
        $sth = $DBH->prepare($sql);
        $sth->execute;
        # There is an existing user preference
        if ($sth->rows == 1) {
            my ($subform, $cols, %CURRENT_SUP);
            $row = $sth->fetchrow_hashref;
            %CURRENT_SUP = %CURRENT;
            %CURRENT = (
                "sn"        => $$row{"sn"},
                "usr"       => $$row{"usr"},
                "domain"    => $$row{"domain"},
                "name"      => $$row{"name"},
                "value"     => $$row{"value"},
            );
            $subform = new CGI("");
            $subform->param("form", "cur");
            $subform->param("sn", $$row{"sn"});
            $subform->param("usr", get_login_sn);
            $subform->param("domain", $form->param("domain"));
            $subform->param("name", $name);
            $subform->param("value", $val);
            $cols = new Selima::Processor::UserPref($subform);
            $cols->_save_cols;
            push @{$self->{"subs"}}, $cols;
            %CURRENT = %CURRENT_SUP;
        
        # There is no existing user preference
        } else {
            my ($subform, $cols);
            $subform = new CGI("");
            $subform->param("form", "new");
            $subform->param("usr", get_login_sn);
            $subform->param("domain", $form->param("domain"));
            $subform->param("name", $name);
            $subform->param("value", $val);
            $cols = new Selima::Processor::UserPref($subform);
            $cols->_save_cols;
            push @{$self->{"subs"}}, $cols;
        }
    }
    return;
}

# _actlog: Log the activity
sub _actlog : method {
    local ($_, %_);
    my $self;
    $self = $_[0];
    # Run the sub-processors
    foreach (@{$self->{"subs"}}) {
        $_->_actlog if $_->_modified;
    }
}

# _prefval: Obtain the preference value
sub _prefval : method {
    local ($_, %_);
    my ($self, $name);
    ($self, $name) = @_;
    # Specified
    return $_ if defined($_ = $self->{"form"}->param($name));
    # No need to check the validility.  Invalids are simply ignored.
    @_ = grep s/^${name}_//, $self->{"form"}->param;
    # Compose the preference value
    return join " ", @_;
}

return 1;