#! /usr/bin/perl -w
# History: Theory and Culture
# newslets.cgi: The newsletter administration.

#  Copyright (c) 2006-2021 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: 2006-04-28

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 fetch_index($$$);

use Date::Parse qw(str2time);

initenv(-restricted => 1,
        -this_table => "newslets",
        -dbi_lock   => {"newslets"              => LOCK_EX,
                        "nlindex"               => LOCK_EX,
                        "nlarts"                => LOCK_SH},
        -lastmod    => 1,
        -page_param => {"keywords"              => N_("newsletters")});

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 {
            $processor = new Selima::htc::Processor::Newslet($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") {
        
        # 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;
        
        # A form to preview a submitted item
        } elsif ($_ eq "preview") {
            my ($sql, $sth, $count, $row, @allno);
            # Check at fetch_preview()
            $error = fetch_preview;
            return $error if defined $error;
            $PREVIEW{"path"} = sprintf "/newsletters/%03d/", $PREVIEW{"no"};
            $PREVIEW{"date"} = str2time $PREVIEW{"date"};
            $PREVIEW{"title"} = newslet_textno($PREVIEW{"no"}) . " " . $PREVIEW{"title"};
            
            # Obtain all the pages
            @_ = qw();
            push @_, "sn!=" . $PREVIEW{"sn"} if exists $PREVIEW{"sn"};
            push @_, "NOT hid";
            $sql = "SELECT no FROM newslets"
                . " WHERE " . join(" AND ", @_)
                . " ORDER BY no;\n";
            $sth = $DBH->prepare($sql);
            $sth->execute;
            $count = $sth->rows;
            for (my $i = 0, @allno = qw(); $i < $count; $i++) {
                push @allno, ${$sth->fetch}[0];
            }
            undef $sth;
            # Insert this page
            for ($_ = 0; $_ < @allno; $_++) {
                last if $PREVIEW{"no"} < $allno[$_];
            }
            @allno = (
                @allno[0..$_-1],
                $PREVIEW{"no"},
                @allno[$_..$#allno]);
            $PREVIEW{"allno"} = [@allno];
        
        # 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::Newslet(curform);
        $checker->redir(qw(selndxart delndxart));
        $error = $checker->check(qw(no date title credits 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::htc::Checker::Newslet(curform);
        $checker->redir(qw(del selndxart delndxart));
        $error = $checker->check(qw(no date title credits 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::htc::Checker::Newslet(curform);
        $checker->redir(qw(cancel));
    
    # 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) {
        # A form to preview a submitted item
        if (form_type eq "preview") {
            html_preview;
        
        } else {
            $FORM = new Selima::htc::Form::Newslet($status);
            html_header $FORM->{"title"};
            html_errmsg $status;
            $FORM->html;
            html_footer;
        }
    
    # List the available items
    } else {
        $LIST = new Selima::htc::List::Newslets;
        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 newsletter."),
            "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 newsletter does not exist anymore.  Please select another one."),
            "isform"=>0}
        if scalar(keys %CURRENT) == 0;
    
    # Obtain the date
    $CURRENT{"date"} = fmtdate $CURRENT{"date"};
    
    # Obtain the belonging index items list
    @_ = qw();
    push @_, "sn AS sn";
    push @_, "art AS art";
    push @_, "title AS title";
    $sql = "SELECT " . join(", ", @_) . " FROM nlindex"
        . " WHERE newslet=$sn"
        . " AND parent IS NULL"
        . " ORDER BY ord;\n";
    $sth = $DBH->prepare($sql);
    $sth->execute;
    $CURRENT{"ndxcount"} = $sth->rows;
    for ($_ = 0; $_ < $CURRENT{"ndxcount"}; $_++) {
        $row = $sth->fetchrow_hashref;
        $CURRENT{"ndx$_"} = 1;
        $CURRENT{"ndx$_" . "sn"} = $$row{"sn"};
        $CURRENT{"ndx$_" . "art"} = $$row{"art"};
        $CURRENT{"ndx$_" . "title"} = $$row{"title"};
    }
    for ($_ = 0; $_ < $CURRENT{"ndxcount"}; $_++) {
        fetch_index $sn, $CURRENT{"ndx$_" . "sn"}, "ndx$_" . "sub";
    }
    
    # Obtain the belonging articles list
    @_ = qw();
    push @_, "sn AS sn";
    push @_, "title AS title";
    $sql = "SELECT " . join(", ", @_) . " FROM nlarts"
        . " WHERE newslet=$sn"
        . " ORDER BY ord;\n";
    $sth = $DBH->prepare($sql);
    $sth->execute;
    $CURRENT{"artcount"} = $sth->rows;
    for ($_ = 0; $_ < $CURRENT{"artcount"}; $_++) {
        $row = $sth->fetchrow_hashref;
        $CURRENT{"art$_" . "sn"} = $$row{"sn"};
        $CURRENT{"art$_" . "title"} = $$row{"title"};
    }
    
    # OK
    return;
}

# fetch_index: Fetch the index of the current item
sub fetch_index($$$) {
    local ($_, %_);
    my ($sn, $parent, $prefix, $sql, $sth, $count, $row);
    ($sn, $parent, $prefix) = @_;
    
    # Find the items
    @_ = qw();
    push @_, "sn AS sn";
    push @_, "art AS art";
    push @_, "title AS title";
    $sql = "SELECT " . join(", ", @_) . " FROM nlindex"
        . " WHERE newslet=$sn"
        . " AND parent=$parent"
        . " ORDER BY ord;\n";
    $sth = $DBH->prepare($sql);
    $sth->execute;
    $count = $sth->rows;
    return if $count == 0;
    $CURRENT{$prefix} = 1;
    $CURRENT{$prefix . "count"} = $count;
    for ($_ = 0; $_ < $CURRENT{$prefix . "count"}; $_++) {
        $row = $sth->fetchrow_hashref;
        $CURRENT{"$prefix$_"} = 1;
        $CURRENT{"$prefix$_" . "sn"} = $$row{"sn"};
        $CURRENT{"$prefix$_" . "art"} = $$row{"art"};
        $CURRENT{"$prefix$_" . "title"} = $$row{"title"};
    }
    undef $sth;
    
    # Find the subitems
    for ($_ = 0; $_ < $CURRENT{$prefix . "count"}; $_++) {
        fetch_index $sn, $CURRENT{"$prefix$_" . "sn"}, "$prefix$_" . "sub";
    }
    return;
}

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