#! /usr/bin/perl -w
# History: Theory and Culture
# nlindex.cgi: The newsletter index 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 => "nlindex",
        -dbi_lock   => {"nlindex"               => LOCK_EX,
                        "newslets"              => LOCK_SH,
                        "nlarts"                => LOCK_SH},
        -lastmod    => 0,
        -page_param => {"keywords"              => N_("newsletter indices")});

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 {
            $processor = new Selima::htc::Processor::NLIndex($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 $error;
            return {"msg"=>N_("This index item has [numerate,_1,a subitem,subitems].  It cannot be deleted.  To delete the index item, [numerate,_1,its subitem,all of its subitems] must first be deleted."),
                    "margs"=>[$CURRENT{"subitemcount"}],
                    "isform"=>0}
                if $CURRENT{"subitemcount"} > 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::htc::Checker::NLIndex(curform);
        $checker->redir(qw(selnewslet delnewslet selparent delparent selart delart));
        $error = $checker->check(qw(newslet parent ord art title));
        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::htc::Checker::NLIndex(curform);
        $checker->redir(qw(del selnewslet delnewslet selparent delparent selart delart));
        $error = $checker->check(qw(newslet parent ord art title));
        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::htc::Checker::NLIndex(curform);
        $checker->redir(qw(cancel));
        return {"msg"=>N_("This index item has [numerate,_1,a subitem,subitems].  It cannot be deleted.  To delete the index item, [numerate,_1,its subitem,all of its subitems] must first be deleted."),
                "margs"=>[$CURRENT{"subitemcount"}],
                "isform"=>0}
            if $CURRENT{"subitemcount"} > 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) {
        $FORM = new Selima::htc::Form::NLIndex($status);
        html_header $FORM->{"title"};
        html_errmsg $status;
        $FORM->html;
        html_footer;
    
    # List the available items
    } else {
        $LIST = new Selima::htc::List::NLIndex;
        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);
    
    # 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 index item."),
            "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 index item does not exist anymore.  Please select another one."),
            "isform"=>0}
        if scalar(keys %CURRENT) == 0;
    
    # Obtain the belonging subitems list
    @_ = qw();
    push @_, "nlindex.sn AS sn";
    push @_, "nlindex_fulltitle(parent, COALESCE(nlindex.title, nlarts.title)) AS title";
    $sql = "SELECT " . join(", ", @_) . " FROM nlindex"
        . " LEFT JOIN nlarts ON nlindex.art=nlarts.sn"
        . " WHERE nlindex_ischild($sn, nlindex.sn)"
        . " ORDER BY nlindex_fullord(nlindex.parent, nlindex.ord);\n";
    $sth = $DBH->prepare($sql);
    $sth->execute;
    $CURRENT{"subitemcount"} = $sth->rows;
    for ($_ = 0; $_ < $CURRENT{"subitemcount"}; $_++) {
        $row = $sth->fetchrow_hashref;
        $CURRENT{"subitem$_" . "sn"} = $$row{"sn"};
        $CURRENT{"subitem$_" . "title"} = $$row{"title"};
    }
    
    # OK
    return;
}

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

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