#!/usr/bin/env perl
use warnings;

BEGIN 
{
    if (!defined $ENV{'GSDLHOME'}) {
	print STDERR "Environment variable GSDLHOME not set.\n";
	print STDERR "  Have you sourced Greenstone's 'setup.bash' file?\n";
	exit 1;
    }

    if (!defined $ENV{'JAVA_HOME'} && !defined $ENV{'JRE_HOME'}) {
	print STDERR "Neither JAVA_HOME nor JRE_HOME set.\n";
	print STDERR "Java needed by Fedora command line scripts.\n";
	exit 1;
    }

    $ENV{'FEDORA_HOSTNAME'} = "localhost" if (!defined $ENV{'FEDORA_HOSTNAME'});
    $ENV{'FEDORA_SERVER_PORT'} = "8080" if (!defined $ENV{'FEDORA_SERVER_PORT'});
    $ENV{'FEDORA_USER'}     = "fedoraAdmin" if (!defined $ENV{'FEDORA_USER'});
    $ENV{'FEDORA_PASS'}     = "fedoraAdmin" if (!defined $ENV{'FEDORA_PASS'});
    $ENV{'FEDORA_PROTOCOL'} = "http" if (!defined $ENV{'FEDORA_PROTOCOL'});
    $ENV{'FEDORA_PID_NAMESPACE'} = "greenstone" if (!defined $ENV{'FEDORA_PID_NAMESPACE'});
    $ENV{'FEDORA_PREFIX'} = "/fedora" if (!defined $ENV{'FEDORA_PREFIX'});

    unshift (@INC, "$ENV{'GSDLHOME'}/perllib/");

}


use strict;
no strict 'refs'; # allow filehandles to be variables and vice versa
no strict 'subs'; # allow barewords (e.g. STDERR) as function arguments

use util;
use gsprintf 'gsprintf';
use printusage;
use parse2;
use cfgread;
use colcfg;

use g2futil;

use dbutil;

my $arguments = 
    [ 
      { 'name' => "verbosity",
	'desc' => "Level of verbosity generated",
	'type' => "string",
	'deft' => '1',
	'reqd' => "no",
        'hiddengli' => "no" },
      { 'name' => "hostname",
	'desc' => "Domain hostname of Fedora server",
	'type' => "string",
	'deft' => $ENV{'FEDORA_HOSTNAME'},
	'reqd' => "no",
        'hiddengli' => "no" },
      { 'name' => "port",
	'desc' => "Port that the Fedora server is running on.",
	'type' => "string",
	'deft' => $ENV{'FEDORA_SERVER_PORT'},
	'reqd' => "no",
        'hiddengli' => "no" },
      { 'name' => "username",
	'desc' => "Fedora admin username",
	'type' => "string",
	'deft' => $ENV{'FEDORA_USER'},
	'reqd' => "no",
        'hiddengli' => "no" },
      { 'name' => "password",
	'desc' => "Fedora admin password",
	'type' => "string",
	'deft' => $ENV{'FEDORA_PASS'},
	'reqd' => "no",
        'hiddengli' => "no" },
      { 'name' => "protocol",
	'desc' => "Fedora protocol, e.g. 'http' or 'https'",
	'type' => "string",
	'deft' => $ENV{'FEDORA_PROTOCOL'},
	'reqd' => "no",
        'hiddengli' => "no" },
      { 'name' => "pidnamespace",
	'desc' => "Fedora prefix for PIDs",
	'type' => "string",
	'deft' => $ENV{'FEDORA_PID_NAMESPACE'},
	'reqd' => "no",
        'hiddengli' => "no" },
      { 'name' => "gli",
	'desc' => "",
	'type' => "flag",
	'reqd' => "no",
	'hiddengli' => "yes" },
      { 'name' => "xml",
	'desc' => "{scripts.xml}",
	'type' => "flag",
	'reqd' => "no",
	'hiddengli' => "yes" },
      { 'name' => "language",
	'desc' => "{scripts.language}",
	'type' => "string",
	'reqd' => "no",
	'modegli' => "3" },
      { 'name' => "collectdir",
	'desc' => "{import.collectdir}",
	'type' => "string",
	'deft' => "",
	'reqd' => "no",
	'hiddengli' => "yes" }
      ];

my $prog_options 
    = { 'name' => "g2f-deletecol.pl",
	'desc' => "Delete a collection and its FedoraMETS documents ingested into Fedora",
	'args' => $arguments };


sub main
{
    my (@ARGV) = @_;

    my $GSDLHOME = $ENV{'GSDLHOME'};


    my $options = {};
    # general options available to all plugins
    my $intArgLeftinAfterParsing = parse2::parse(\@ARGV,$arguments,$options,"allow_extra_options");

    # Something went wrong with parsing
    if ($intArgLeftinAfterParsing ==-1)
    {
	&PrintUsage::print_txt_usage($prog_options, "[options] greenstone-col");
	die "\n";
    }

    my $xml = $options->{'xml'};
    my $gli = $options->{'gli'};

    if ($intArgLeftinAfterParsing != 1)
    {
	if ($xml) {
	    &PrintUsage::print_xml_usage($prog_options);
	    print "\n";
	    return;
	}
	else {
	    &PrintUsage::print_txt_usage($prog_options, "[options] greenstone-col");
	    print "\n";
	    return;
	}
	    
    }

    my $gs_col = $ARGV[0];

    my $verbosity = $options->{'verbosity'};
    my $hostname  = $options->{'hostname'};
    my $port      = $options->{'port'};
    my $username  = $options->{'username'};
    my $password  = $options->{'password'};
    my $protocol  = $options->{'protocol'};
    my $pid_namespace = $options->{'pidnamespace'};


    my $collectdir = $options->{'collectdir'};

    if (!$collectdir) {
	if($ENV{'GSDL3HOME'}) {
	    $collectdir = &util::filename_cat($ENV{'GSDL3HOME'},"sites","localsite","collect");
	} else {
	    $collectdir = &util::filename_cat($ENV{'GSDLHOME'},"collect");
	}
    }

    my $full_gs_col = &util::filename_cat($collectdir,$gs_col);


    if (!-e $full_gs_col ) {
	print STDERR "Unable to find Greenstone collection $full_gs_col\n";
    }


    my $export_dir = &util::filename_cat($full_gs_col,"export");


    print "***\n";
    print "* Deleting files of Fedora collection namespace: $pid_namespace\n";
    print "***\n";

    # => Delete individually!

    # set up fedoragsearch for updating the index upon ingesting documents
    my $fedoragsearch_webapp = &g2futil::gsearch_webapp_folder();    

    # need the username and password preset in order to run fedoraGSearch's RESTClient script
    # this assumes that the fedoragsearch authentication details are the same as for fedora
    if (defined $fedoragsearch_webapp) {
	$ENV{'fgsUserName'} = $options->{'username'};
	$ENV{'fgsPassword'} = $options->{'password'};
    }

    if (opendir(DIR, $export_dir)) {	
	my @xml_files = grep { $_ =~ m/^greenstone-http.*\.xml$/ } readdir(DIR);
	closedir DIR;

	# 1. purge all the (URL,hashID) metadata files that we inserted
	# into fedora at the end of g2f-buildcol.pl
	# convert the filenames into fedora-pids
	# filename = greenstone-http=tmpcol-http-__test1-html.xml -> fpid = greenstone-http:tmpcol-http-__test1.html
	foreach my $file (@xml_files) {
	    my $fedora_pid = $file;
	    $fedora_pid =~ s/\.xml$//;
	    $fedora_pid =~ s/\=/:/;
	    $fedora_pid =~ s/(.*)-(.*)$/$1.$2/;
	    
	    print STDERR "#### fedora_pid: $fedora_pid\n";
	    &g2futil::run_purge($fedora_pid,$options); # displays error message if first time (nothing to purge)
	    # these weren't indexed into fedoragsearch, so don't need to remove their pids from gsearch
	}
	

	## my @hash_dirs = grep { /\.dir$/ } readdir(DIR);
	my @hash_dirs = &g2futil::get_all_hash_dirs($export_dir);


	# 2. for each hash dir, purge its respective PID (includes fedora collection file)
	foreach my $hd (@hash_dirs) {

	    my $hash_id = &g2futil::get_hash_id($hd);
	    
	    if (defined $hash_id) {

		my $pid = "$pid_namespace:$gs_col-$hash_id";		

		my $dsinfo_status = &g2futil::run_datastore_info($pid,$options);
		
		if ($dsinfo_status == 0) {
		    # first remove the doc from the gsearch index before removing it from the fedora repository
		    print "  deleting $pid from GSearch index\n";
		    &g2futil::run_delete_from_index($fedoragsearch_webapp,$pid,$options) if defined $fedoragsearch_webapp;

		    print "  $pid being deleted.\n";
		    &g2futil::run_purge($pid,$options);
		}
		else {
		    print "  $pid not present.\n";
		}
	    }	    
	}
    }
    else {
	print STDERR "*** Unable to open directory $export_dir: $!\n";    

	# 3. even when there's no documents ingested into the collection (no export dir), 
	# the collection file still exists, so purge just the collection file now

	my $pid = "$pid_namespace:$gs_col-collection";
	my $dsinfo_status = &g2futil::run_datastore_info($pid,$options);

	if ($dsinfo_status == 0) {
	    # first remove the doc from the gsearch index before removing it from the fedora repository
	    print "  deleting $pid from GSearch index\n";
	    &g2futil::run_delete_from_index($fedoragsearch_webapp,$pid,$options) if defined $fedoragsearch_webapp;
	    
	    print "  collection $pid being deleted.\n";
	    &g2futil::run_purge($pid,$options);
	}
	else {
	    print "  collection $pid not present.\n";
	}
    }

    # 4. need to specially delete the collection file when using FLI
    if($gli) {
	my $pid = "$pid_namespace:$gs_col-collection";
	my $dsinfo_status = &g2futil::run_datastore_info($pid,$options);
	
	if ($dsinfo_status == 0) {
	    # first remove the doc from the gsearch index before removing it from the fedora repository
	    print "  deleting $pid from GSearch index\n";
	    &g2futil::run_delete_from_index($fedoragsearch_webapp,$pid,$options) if defined $fedoragsearch_webapp;
	    
	    print "  collection $pid being deleted.\n";
	    &g2futil::run_purge($pid,$options);
	}
    }

    my $collection = &util::filename_cat($collectdir, $gs_col);

    if(&util::dir_exists($collection)) {
	print "\n**** If you wish the collection directory $collection to be removed, delete this manually.\n\n";
    }
}

&main(@ARGV);