# Selima Website Content Management System
# LinkCatz.pm: The related-link category membership 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: 2006-03-17

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

use Selima::DataVars qw($DBH :addcol :scptconf);
use Selima::Guest;
use Selima::Links;

# new: Initialize the processor
sub new : method {
    local ($_, %_);
    my ($self, $class);
    ($class, @_) = @_;
    $_[1] = "linkcatz" if @_ < 2;
    $self = $class->SUPER::new(@_);
    return $self;
}

# _save_cols: Save the column deposit
sub _save_cols : method {
    local ($_, %_);
    my ($self, $form, $cur);
    $self = $_[0];
    ($form, $cur) = ($self->{"form"}, $self->{"cur"});
    # A form to create a new item
    if ($self->{"type"} eq "new") {
        $self->{"sn"} = $self->_new_sn;
        $self->{"cols"} = new Selima::AddCol($self->{"table"}, ADDCOL_INSERT);
        $self->{"cols"}->addnum("sn", $self->{"sn"});
        $self->{"cols"}->addnum("cat", $self->_form("cat"));
        $self->{"cols"}->addnum("link", $self->_form("link"));
    
    # A form to edit a current item
    } elsif ($self->{"type"} eq "cur") {
        $self->{"cols"} = new Selima::AddCol($self->{"table"}, ADDCOL_UPDATE);
        $self->{"cols"}->addnum("cat", $self->_form("cat"), scalar $cur->param("cat"));
        $self->{"cols"}->addnum("link", $self->_form("link"), scalar $cur->param("link"));
    }
    return;
}

# _actlog: Log the activity
sub _actlog : method {
    local ($_, %_);
    my ($self, $form, $cur);
    $self = $_[0];
    ($form, $cur) = ($self->{"form"}, $self->{"cur"});
    # A form to create a new item
    return gactlog "Create a link categorization record " . link_url($form->param("link"))
            . " in category " . linkcat_title($form->param("cat"))
            . " with s/n " . $self->{"sn"} . "."
        if $self->{"type"} eq "new";
    # A form to edit a current item
    return gactlog "Update the link categorization record " . link_url($form->param("link"))
            . " in category " . linkcat_title($form->param("cat"))
            . " with s/n " . $self->{"sn"} . "."
        if $self->{"type"} eq "cur";
    # A form to delete a current item
    return gactlog "Delete the link categorization record " . link_url($cur->param("link"))
            . " in category " . linkcat_title($cur->param("cat"))
            . " with s/n " . $self->{"sn"} . "."
        if $self->{"type"} eq "del";
}

# _rebuild_partial_pages: Rebuild a limited part of pages
sub _rebuild_partial_pages : method {
    local ($_, %_);
    my ($self, $form, $cur);
    my ($sql, @parents, @cats, $cond);
    $self = $_[0];
    ($form, $cur) = ($self->{"form"}, $self->{"cur"});
    $self->{"newshown"} = $self->_shown_parts;
    # Remove the unwanted pages
    $self->_remove_curfile;
    
    # Find the affected parents
    @parents = qw();
    @_ = qw();
    %_ = map { $_ => 1 } @{${$self->{"curshown"}}{"cats"}};
    push @_, grep !exists $_{$_}, @{${$self->{"newshown"}}{"cats"}};
    %_ = map { $_ => 1 } @{${$self->{"newshown"}}{"cats"}};
    push @_, grep !exists $_{$_}, @{${$self->{"curshown"}}{"cats"}};
    if (@_ > 0) {
        my ($sql, $sth, $count, $row);
        $sql = "SELECT parent FROM linkcat"
            . " WHERE " . join(" OR ", map "sn=$_", @_)
            . " GROUP BY parent;\n";
        $sth = $DBH->prepare($sql);
        $sth->execute;
        $count = $sth->rows;
        for ($_ = 0; $_ < $count; $_++) {
            push @parents, ${$sth->fetch}[0];
        }
    }
    
    # Find the affected parts
    # Only the shown parts are added
    %_ = qw();
    # A form to create a new item
    if ($self->{"type"} eq "new") {
        $_{$form->param("cat")} = 1;
    # A form to edit a current item
    } elsif ($self->{"type"} eq "cur") {
        $_{$form->param("cat")} = 1;
        $_{$cur->param("cat")} = 1;
    # A form to delete a current item
    } elsif ($self->{"type"} eq "del") {
        $_{$cur->param("cat")} = 1;
    }
    @cats = keys %_;
    # The statistics pages on their parents are affected
    unless ($self->{"type"} eq "cur"
            && $form->param("cat") == $cur->param("cat")) {
        my ($sql, $sth, $count);
        $_ = join(" OR ", map "sn=$_", @cats);
        $_ = "($_)" if @_ > 1;
        $sql = "SELECT parent FROM linkcat"
            . " WHERE $_"
            . " AND parent IS NOT NULL"
            . " AND linkcat_isshown(sn, hid, parent)"
            . " GROUP BY parent;\n";
        $sth = $DBH->prepare($sql);
        $sth->execute;
        $count = $sth->rows;
        for ($_ = 0; $_ < $count; $_++) {
            push @cats, ${$sth->fetch}[0];
        }
    }
    %_ = map { $_ => 1 } @cats;
    @cats = keys %_;
    
    # Compose the SQL statement
    @_ = qw();
    push @_, "sn=" . $_ foreach @cats;
    foreach (@parents) {
        # The parent page and those share the same parent
        if (defined $_) {
            push @_, "sn=" . $_;
            push @_, "parent=" . $_;
        # The topmost pages
        } else {
            push @_, "parent IS NULL";
        }
    }
    $cond = join " OR ", @_;
    $cond = "($cond)" if @_ > 1;
    @_ = $DBH->cols("linkcat");
    push @_, $DBH->strcat("'/links'", "linkcat_path(sn, id, parent)")
      . " AS path";
    $sql = "SELECT " . join(", ", @_) . " FROM linkcat"
        . " WHERE $cond"
        . " AND linkcat_isshown(sn, hid, parent);\n";
    # Rebuild the pages
    $_ = $MAIN->can("rebuild_links");
    &$_($sql);
    return;
}

# _remove_curfile: Remove the unwanted page
sub _remove_curfile : method {
    local ($_, %_);
    my $self;
    $self = $_[0];
    # Remove the unwanted category files
    %_ = map { $_ => 1 } @{${$self->{"newshown"}}{"catspath"}};
    grmoldpage $_
        foreach grep !exists $_{$_}, @{${$self->{"curshown"}}{"catspath"}};
    return;
}

# _shown_parts: Obtain the shown parts
sub _shown_parts : method {
    return links_shown_parts;
}

return 1;