use strict;
use warnings;

package Footprintless::App::Command::log;
$Footprintless::App::Command::log::VERSION = '1.03';
# ABSTRACT: Provides access to log files.
# PODNAME: Footprintless::App::Command::log

use Footprintless::App -command;
use Footprintless::App::UsageException;
use Footprintless::Util qw(exit_due_to);

my $logger = Log::Any->get_logger();

sub _configure_logging {
    my ( $self, $level ) = @_;
    require Log::Any::Adapter;
    Log::Any::Adapter->set( 'Stderr',
        log_level => Log::Any::Adapter::Util::numeric_level($level) );
}

sub execute {
    my ( $self, $opts, $args ) = @_;
    my ( $coordinate, $action ) = @$args;

    if ( $opts->{log} ) {
        $self->_configure_logging( $opts->{log} );
    }

    $action ||= 'follow';

    eval {
        if ( !$action || $action eq 'follow' ) {
            $self->{log}->follow(
                runner_options => { out_handle => \*STDOUT },
                ( $opts->{until} ? ( until => $opts->{until} ) : () )
            );
        }
        elsif ( $action eq 'tail' ) {
            $self->{log}->tail(
                runner_options => { out_handle => \*STDOUT },
                ( $opts->{arg} ? ( args => $opts->{arg} ) : () )
            );
        }
        elsif ( $action eq 'head' ) {
            $self->{log}->head(
                runner_options => { out_handle => \*STDOUT },
                ( $opts->{arg} ? ( args => $opts->{arg} ) : () )
            );
        }
        elsif ( $action eq 'cat' ) {
            $self->{log}->cat(
                runner_options => { out_handle => \*STDOUT },
                ( $opts->{arg} ? ( args => $opts->{arg} ) : () )
            );
        }
        elsif ( $action eq 'grep' ) {
            $self->{log}->grep(
                runner_options => { out_handle => \*STDOUT },
                ( $opts->{arg} ? ( args => $opts->{arg} ) : () )
            );
        }
        else {
            die( Footprintless::App::UsageException->new("invalid action [$action]") );
        }
    };
    if ($@) {
        if (ref($@)
            && (   $@->isa('Footprintless::InvalidEntityException')
                || $@->isa('Footprintless::App::UsageException') )
            )
        {
            $self->usage_error($@);
        }
        exit_due_to( $@, 1 );
    }
}

sub opt_spec {
    return (
        [ "log=s",   "will set the log level", ],
        [ "arg=s@",  "arguments to the action, multiple allowed", ],
        [ "until=s", "a perl regex pattern indicating the follow should stop", ],
    );
}

sub usage_desc {
    return "fpl log [COORDINATE] <ACTION> %o";
}

sub validate_args {
    my ( $self, $opts, $args ) = @_;
    my ( $coordinate, $action ) = @$args;

    $self->usage_error("coordinate is required") unless @$args;

    my $footprintless = $self->app()->footprintless();
    eval { $self->{log} = $footprintless->log( $args->[0] ); };
    if ($@) {
        if ( ref($@) && $@->isa('Footprintless::InvalidEntityException') ) {
            $self->usage_error($@);
        }
        $self->usage_error("invalid coordinate [$coordinate]: $@");
    }
}

1;

__END__

=pod

=head1 NAME

Footprintless::App::Command::log - Provides access to log files.

=head1 VERSION

version 1.03

=head1 SYNOPSIS

  fpl log foo.dev.tomcat.logs.catalina follow
  fpl log foo.prod.web.logs.access grep --arg "--color" --arg "'GET /foo/bar'"

=head1 DESCRIPTION

Provides various forms of read access to log files.  The available actions 
are:

    cat      read the entire file
    follow   essentially tail -f
    grep     search for specific content in the file
    head     read from the beginning of the file
    tail     read from the end of the file

If no action is specified, C<follow> is implied.  For detailed configuration 
see L<Footprintless::Log>. 

=head1 AUTHOR

Lucas Theisen <lucastheisen@pastdev.com>

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2016 by Lucas Theisen.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=head1 SEE ALSO

Please see those modules/websites for more information related to this module.

=over 4

=item *

L<Footprintless|Footprintless>

=back

=cut
