#! /usr/bin/perl -w
# History: Theory and Culture
# linkcat.cgi: The related-link category administration.

#  Copyright (c) 2004-2021 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: 2004-11-02

use 5.008;
use strict;
use warnings;
use lib $ENV{"DOCUMENT_ROOT"} . qw(/magicat/lib/perl5);
use Selima::htc;
local $SIG{"__DIE__"} = \&http_500;
my $d = new Selima::Destroy;
# Prototype declaration
sub main();
sub check_get();
sub check_post();
sub html_page($);
sub fetch_curitem();
sub import_selparent($);

initenv(-restricted => 1,
        -this_table => "linkcat",
        -dbi_lock   => {"linkcat"               => LOCK_EX,
                        "links"                 => LOCK_SH,
                        "linkcatz"              => LOCK_SH},
        -lastmod    => 0,
        -page_param => {"keywords"              => N_("link categories")});

main;
exit 0;

sub main() {
    local ($_, %_);
    my ($error, $success, $processor);
    
    # If the request is a GET query
    if ($ENV{"REQUEST_METHOD"} ne "POST") {
        $error = check_get;
        # If an error occurs
        if (defined $error) {
            html_page $error;
        
        # Display the page
        } else {
            html_page retrieve_status;
        }
    
    # If a form was POSTed from the client
    } else {
        $error = check_post;
        # If an error occurs
        if (defined $error) {
            error_redirect $error;
        
        # Else, save the data
        } else {
            $processor = new Selima::Processor::LinkCat($POST);
            $success = $processor->process;
            success_redirect $success;
        }
    }
    return;
}

# check_get: Check the GET arguments
sub check_get() {
    local ($_, %_);
    my $error;
    
    # A form is requested
    if (is_form) {
        $_ = form_type;
        # A form to create a new item
        if ($_ eq "new") {
            # Nothing to check on a new form
        
        # A form to edit a current item
        } elsif ($_ eq "cur") {
            # Check at fetch_curitem()
            $error = fetch_curitem;
            return $error if defined $error;
        
        # A form to delete a current item
        } elsif ($_ eq "del") {
            # Check at fetch_curitem()
            $error = fetch_curitem;
            return $error if defined $error;
            return {"msg"=>N_("This category has [numerate,_1,a subcategory,subcategories].  It cannot be deleted.  To delete the category, [numerate,_1,its subcategory,all of its subcategories] must first be deleted."),
                    "margs"=>[$CURRENT{"scatcount"}],
                    "isform"=>0}
                if $CURRENT{"scatcount"} > 0;
            return {"msg"=>N_("This category has [numerate,_1,a link,links].  It cannot be deleted.  To delete the category, [numerate,_1,its link,all of its links] must first be deleted."),
                    "margs"=>[$CURRENT{"linkcount"}],
                    "isform"=>0}
                if $CURRENT{"linkcount"} > 0;
        
        # Not a valid form
        } else {
            return {"msg"=>N_("Incorrect form: [_1]."),
                    "margs"=>[$_],
                    "isform"=>0};
        }
    }
    # List handler handles its own error
    # OK
    return;
}

# check_post: Check the POSTed form
sub check_post() {
    local ($_, %_);
    my ($checker, $error);
    $_ = form_type;
    # A form to create a new item
    if ($_ eq "new") {
        # Run the checker
        $checker = new Selima::Checker::LinkCat(curform);
        $checker->redir(qw(selparent delparent));
        $error = $checker->check(qw(parent id ord title kw));
        return $error if defined $error;
    
    # A form to edit a current item
    } elsif ($_ eq "cur") {
        # Check at fetch_curitem()
        $error = fetch_curitem;
        return $error if defined $error;
        # Run the checker
        $checker = new Selima::Checker::LinkCat(curform);
        $checker->redir(qw(del selparent delparent));
        $error = $checker->check(qw(parent id ord title kw));
        return $error if defined $error;
    
    # A form to delete a current item
    } elsif ($_ eq "del") {
        # Check at fetch_curitem()
        $error = fetch_curitem;
        return $error if defined $error;
        # Run the checker
        $checker = new Selima::Checker::LinkCat(curform);
        $checker->redir(qw(cancel));
        return {"msg"=>N_("This category has [numerate,_1,a subcategory,subcategories].  It cannot be deleted.  To delete the category, [numerate,_1,its subcategory,all of its subcategories] must first be deleted."),
                "margs"=>[$CURRENT{"scatcount"}],
                "isform"=>0}
            if $CURRENT{"scatcount"} > 0;
        return {"msg"=>N_("This category has [numerate,_1,a link,links].  It cannot be deleted.  To delete the category, [numerate,_1,its link,all of its links] must first be deleted."),
                "margs"=>[$CURRENT{"linkcount"}],
                "isform"=>0}
            if $CURRENT{"linkcount"} > 0;
    
    # Not a valid form
    } else {
        return {"msg"=>N_("Incorrect form: [_1]."),
                "margs"=>[$_],
                "isform"=>0};
    }
    # OK
    return;
}

# html_page: Display the page
sub html_page($) {
    local ($_, %_);
    my ($status, $LIST, $FORM);
    $status = $_[0];
    # A form is requested
    if (is_form $status) {
        $FORM = new Selima::Form::LinkCat($status);
        html_header $FORM->{"title"};
        html_errmsg $status;
        $FORM->html;
        html_footer;
    
    # List the available items
    } else {
        $LIST = new Selima::List::LinkCat;
        html_header $LIST->{"title"}, $LIST->page_param;
        html_errmsg $status;
        $LIST->html;
        html_footer;
    }
    return;
}


##################################
# Subroutines to manage the data #
##################################
# fetch_curitem: Fetch the current item
sub fetch_curitem() {
    local ($_, %_);
    my ($sn, $FORM, $sth, $sql, $row);
    my ($lang, $lndb, $lndbdef, $langfile, $title);
    
    # Return if fetched before
    return if scalar(keys %CURRENT) > 0;
    
    # Obtain the current form
    $FORM = curform;
    # No item specified
    return {"msg"=>N_("Please select the category."),
            "isform"=>0}
        if !defined $FORM->param("sn");
    $sn = $FORM->param("sn");
    
    # Find the record
    %CURRENT = fetchrec $sn, $THIS_TABLE;
    # If this record exist
    return {"msg"=>N_("This category does not exist anymore.  Please select another one."),
            "isform"=>0}
        if scalar(keys %CURRENT) == 0;
    
    $lang = getlang;
    $lndb = getlang LN_DATABASE;
    $lndbdef = ln $DEFAULT_LANG, LN_DATABASE;
    $langfile = getlang LN_FILENAME;
    
    # Obtain the belonging subcategories list
    @_ = qw();
    push @_, "sn AS sn";
    if (@ALL_LINGUAS > 1) {
        $title = $lang eq $DEFAULT_LANG? "title_$lndb":
            "COALESCE(title_$lndb, title_$lndbdef)";
        push @_, "linkcat_fulltitle('$lang', parent, $title) AS title";
    } else {
        push @_, "linkcat_fulltitle(parent, title) AS title";
    }
    push @_, $DBH->strcat("'/links'", "linkcat_path(sn, id, parent)")
        . " AS url";
    $sql = "SELECT " . join(", ", @_) . " FROM linkcat"
        . " WHERE linkcat_ischild($sn, sn)"
        . " ORDER BY linkcat_fullord(parent, ord);\n";
    $sth = $DBH->prepare($sql);
    $sth->execute;
    $CURRENT{"scatcount"} = $sth->rows;
    for ($_ = 0; $_ < $CURRENT{"scatcount"}; $_++) {
        $row = $sth->fetchrow_hashref;
        $CURRENT{"scat$_" . "sn"} = $$row{"sn"};
        $CURRENT{"scat$_" . "title"} = $$row{"title"};
        $CURRENT{"scat$_" . "url"} = $$row{"url"};
    }
    
    # Obtain the belonging links list
    @_ = qw();
    push @_, "links.sn AS sn";
    push @_, "links.title AS title";
    push @_, "url AS url";
    $sql = "SELECT " . join(", ", @_) . " FROM links"
        . " INNER JOIN linkcatz ON linkcatz.link=links.sn"
        . " WHERE linkcatz.cat=$sn"
        . " ORDER BY title;\n";
    $sth = $DBH->prepare($sql);
    $sth->execute;
    $CURRENT{"linkcount"} = $sth->rows;
    for ($_ = 0; $_ < $CURRENT{"linkcount"}; $_++) {
        $row = $sth->fetchrow_hashref;
        $CURRENT{"link$_" . "sn"} = $$row{"sn"};
        $CURRENT{"link$_" . "title"} = $$row{"title"};
        $CURRENT{"link$_" . "url"} = $$row{"url"};
    }
    
    # OK
    return;
}

# import_selparent: Import the selected parent into the retrieved form
sub import_selparent($) {
    local ($_, %_);
    my $FORM;
    $FORM = $_[0];
    if (    defined $GET->param("selsn")
            && check_sn_in ${$GET->param_fetch("selsn")}[0], "linkcat") {
        $FORM->param("parent", $GET->param("selsn"));
        $FORM->param("topmost", "false");
    }
    return;
}