#!/usr/bin/perl
# ------------------------------------------------------------------------------
# (C) Crown copyright Met Office. All rights reserved.
# For further details please refer to the file COPYRIGHT.txt
# which you should have received as part of this distribution.
# ------------------------------------------------------------------------------

use strict;
use warnings;

use FindBin;
use lib "$FindBin::Bin/../lib";
use File::Basename qw{basename};
use File::Spec;
use IO::File;
use Mail::Mailer;

use FCM::Admin::Config;
use FCM::Admin::Runner;
use FCM::Admin::System qw{
    backup_svn_repository
    backup_trac_environment
    backup_trac_ini_file
    backup_trac_passwd_file
    distribute_wc
    get_projects_from_svn_live
    get_projects_from_trac_live
    get_users
    manage_users_in_svn_passwd
    manage_users_in_trac_passwd
    manage_users_in_trac_db_of
};

my $THIS   = basename($0);
my $CONFIG = FCM::Admin::Config->instance();

my $OUT_FILE
    = File::Spec->catfile($CONFIG->get_fcm_home(), q{FCM}, qq{$THIS.out});

main();

sub main {
    # Redirects STDOUT and STDERR to the $OUT_FILE
    open(my $old_out, q{>&}, \*STDOUT)
        or die("$THIS: cannot duplicate STDOUT ($!)\n");
    open(my $old_err, q{>&}, \*STDERR)
        or die("$THIS: cannot duplicate STDERR ($!)\n");
    open(STDOUT, q{>}, $OUT_FILE)
        or die("$THIS: cannot redirect STDOUT ($!)\n");
    open(STDERR, q{>&}, \*STDOUT)
        or die("$THIS: cannot redirect STDERR ($!)\n");

    do_tasks();

    # Restores STDOUT and STDERR
    open(STDERR, q{>&}, $old_err)
        or die("$THIS: cannot reinstate STDERR ($!)\n");
    open(STDOUT, q{>&}, $old_out)
        or die("$THIS: cannot reinstate STDOUT ($!)\n");

    notify();
}

# ------------------------------------------------------------------------------
# Performs the daily update tasks.
sub do_tasks {
    # (no argument)
    my $RUNNER = FCM::Admin::Runner->instance();
    my @svn_projects = get_projects_from_svn_live();
    my @trac_projects = get_projects_from_trac_live();
    my $user_ref = undef;
    $RUNNER->run_continue(
        "retrieving user accounts",
        sub {$user_ref = get_users(); return 1;},
    );
    if (defined($user_ref)) {
        $RUNNER->run_continue(
            "updating SVN user accounts",
            sub {return manage_users_in_svn_passwd($user_ref)},
        );
        $RUNNER->run_continue(
            "updating Trac user accounts",
            sub {return manage_users_in_trac_passwd($user_ref)},
        );
        for my $project (@trac_projects) {
            $RUNNER->run_continue(
                "updating Trac accounts in $project",
                sub {
                    return manage_users_in_trac_db_of($project, $user_ref);
                },
            );
        }
    }
    for my $project (@svn_projects) {
        $RUNNER->run_continue(
            "backing up SVN repository for $project",
            sub {return backup_svn_repository($project, 1, 1)},
        );
    }
    for my $project (@trac_projects) {
        $RUNNER->run_continue(
            "backing up Trac environment for $project",
            sub {return backup_trac_environment($project, 1)},
        );
    }
    $RUNNER->run_continue(
        "backing up Trac (central) INI file",
        sub {return backup_trac_ini_file()},
    );
    $RUNNER->run_continue(
        "backing up Trac password file",
        sub {return backup_trac_passwd_file()},
    );
    $RUNNER->run_continue(
        "distributing FCM to standard locations",
        sub {return distribute_wc()},
    );
}

# ------------------------------------------------------------------------------
# Notifies on completion.
sub notify {
    # (no argument)
    # Reports number of arguments in subject.
    my @exceptions = FCM::Admin::Runner->instance()->get_exceptions();
    my $subject
        = sprintf(qq{$THIS finished with %d error(s)}, scalar(@exceptions));

    my $mailer = Mail::Mailer->new();
    $mailer->open({
        From    => $CONFIG->get_admin_email(),
        To      => $CONFIG->get_admin_email(),
        Subject => $subject,
    });

    # Summarises the exceptions at the beginning of the message
    $mailer->print(qq{$subject:\n});
    for my $exception (@exceptions) {
        $mailer->print(qq{    $exception});
    }
    $mailer->print(qq{\n});

    # Prints content of the output
    $mailer->print(q{#} x 72 . qq{\n});
    $mailer->print(qq{# Output and error output of $THIS:\n});
    $mailer->print(q{#} x 72 . qq{\n});
    my $out_file_handle = IO::File->new($OUT_FILE);
    if (defined($out_file_handle)) {
        while (my $line = $out_file_handle->getline()) {
            $mailer->print($line);
        }
        $out_file_handle->close();
    }
    $mailer->close();
}

__END__

=head1 NAME

fcm-daily-update

=head1 SYNOPSIS

    fcm-daily-update

=head1 DESCRIPTION

This program performs the daily update for the FCM system.

=head1 COPYRIGHT

E<169> Crown copyright Met Office. All rights reserved.

=cut