package PUC::Collector;

use strict;
use warnings;

use 5.10.1;

# Uses core modules only.

use Carp;
use Data::Dumper;
use Safe;
use Sys::Hostname;

use PUC::Collector::DataStore;

use Log::Log4perl;
Log::Log4perl->init_once('/opt/PUC/log4perl.conf');
my $log = Log::Log4perl->get_logger();

my $COLLECTOR_CONFIG_FILE = 'collector_config.conf';
my $USERDATADOMAINS       = 'etc/userdatadomains';

sub run {
    my %args = @_;

    my $config  = startup(%args);
    my $domains = get_domain_list($config);
    my @modules = map {
        "PUC::Module::$_"->new( app_config => $config )
    } @{ $config->{primary_modules} };

    my @secondary_modules = map {
        "PUC::Module::$_"->new( app_config => $config )
    } @{ $config->{secondary_modules} };

    for my $domain ( @{$domains} ) {
        for my $module (@modules) {
            if ( $args{single_domain} ) {
                if ( $domain->{name} eq $args{single_domain} ) {
                    $module->process_domain($domain);
                }
            }
            elsif ( $args{single_user} ) {
                if ( $domain->{username} eq $args{single_user} ) {
                    $module->process_domain($domain);
                }
            }
            else {
                $module->process_domain($domain);
            }
        }
    }
    return;
}

################################################################################

sub startup {
    my %args = @_;

    my $config = parse_config(%args);
    load_modules($config);
    $config->{datastore} =
      PUC::Collector::DataStore->new( %{ $config->{datastore_config} } );

    return $config;
}

################################################################################

sub parse_config {
    my %args = @_;

    my $libdir = $args{bindir} . '/lib';
    my %primary_modules;
    my %secondary_modules;
    my $config_data = {};
    my $config_file = $args{bindir} . '/' . $COLLECTOR_CONFIG_FILE;

    if ( -f $config_file ) {
        open my $fh, '<', $config_file or croak "Unable to read config file: $!";

        my $contents;
        {
            ## no critic [Variables::RequireInitializationForLocalVars]
            local $/;
            ##
            $contents = <$fh>;
        }
        close $fh;

        my $compartment = Safe->new();
        $config_data = $compartment->reval($contents);
        if ( ref($config_data) ne 'HASH' ) {
            croak "Error in collector config file: $@";
        }

        for my $module_entry ( @{ $config_data->{modules} } ) {
            if ( scalar( @{ $module_entry->{requires} } ) ) {
                $secondary_modules{ $module_entry->{name} } = 1;
                for my $secondary_name ( @{ $module_entry->{requires} } ) {
                    $secondary_modules{$secondary_name} = 1;
                }
            }
            else {
                $primary_modules{ $module_entry->{name} } = 1;
            }
        }
    }

    my @pri    = keys %primary_modules;
    my @sec    = keys %secondary_modules;
    my $config = {
        hostname          => hostname(),
        debug             => $args{debug},
        dryrun            => $args{dryrun},
        dataroot          => $args{dataroot},
        bindir            => $args{bindir},
        libdir            => $libdir,
        primary_modules   => \@pri,
        secondary_modules => \@sec,
        datastore_config  => $config_data->{datastore_config},
    };
    if ( $args{datastore_base_url} ) {
        $config->{datastore_config}->{base_url} = $args{datastore_base_url};
    }
    if ( $args{datastore_key_file} ) {
        $config->{datastore_config}->{key_file} = $args{datastore_key_file};
    }
    if ( $config->{dryrun} ) {
        $config->{datastore_config}->{base_url} = 'dryrun://localhost';
    }

    $log->info("config " . Dumper($config));

    if ( $config->{debug} ) {
        print STDERR "config " . Dumper($config);
    }

    return $config;
}

################################################################################

sub load_modules {
    my $config = shift;

    push @INC, $config->{libdir};

    ## no critic [Modules::RequireBarewordIncludes]
    for my $primary_module ( @{ $config->{primary_modules} } ) {
        $log->info("Loading Primary Module: ".$primary_module);

        print STDERR "Loading Primary Module: $primary_module\n"
          if $config->{debug};

        my $package = "PUC::Module::$primary_module";
        ( my $file = $package ) =~ s|::|/|g;
        require "$file.pm";
    }
    for my $secondary_module ( @{ $config->{secondary_modules} } ) {
        $log->info("Loading Secondary Module: ".$secondary_module);

        print STDERR "Loading Secondary Module: $secondary_module\n"
          if $config->{debug};

        my $package = "PUC::Module::$secondary_module";
        ( my $file = $package ) =~ s|::|/|g;
        require "$file.pm";
    }
    ##

    return;
}

################################################################################
sub get_domain_list {
    my $config = shift;

    my @docroot_list;
    my $file_name = $config->{dataroot} . $USERDATADOMAINS;
    open my $fh, '<', $file_name or croak "can't open < $file_name: $!";
    while (<$fh>) {
        my ( $domain, $data ) = split ': ', $_, 2;
        my ( $username, undef, $type, undef, $docroot ) = split '==', $data;
        push @docroot_list,
          {
            name     => $domain,
            docroot  => $docroot,
            username => $username,
            type     => $type,
          };
    }
    close $fh;

    $log->info("domains " . Dumper( \@docroot_list ));

    if ( $config->{debug} ) {
        print STDERR "domains " . Dumper( \@docroot_list );
    }

    return \@docroot_list;
}

################################################################################

1;