# mt-aws-glacier - Amazon Glacier sync client
# Copyright (C) 2012-2013  Victor Efimov
# http://mt-aws.com (also http://vs-dev.com) vs@vs-dev.com
# License: GPLv3
#
# This file is part of "mt-aws-glacier"
#
#    mt-aws-glacier is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    mt-aws-glacier is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

package App::MtAws::ChildWorker;

our $VERSION = '1.059';

use App::MtAws::LineProtocol;
use App::MtAws::GlacierRequest;
use App::MtAws::Utils;
use App::MtAws::Exceptions;
use strict;
use warnings;
use utf8;
use Carp;
use IO::Select;
use POSIX;

sub new
{
	my ($class, %args) = @_;
	my $self = \%args;
	$self->{fromchild}||die;
	$self->{tochild}||die;
	$self->{options}||die;
	bless $self, $class;
	return $self;
}

sub process
{
	my ($self) = @_;

	my $tochild = $self->{tochild};
	my $fromchild = $self->{fromchild};
	while (1) {
		my ($remote_pid, $action, $taskid, $data, $attachmentref) = get_data($tochild);
		$remote_pid or comm_error(); # we exit() if eof or socket error. we don't distinct
		my ($result, $result_attachmentref, $console_out) = $self->process_task($action, $data, $attachmentref);
		$result->{console_out}=$console_out;
		send_data($fromchild, 'response', $taskid, $result, $result_attachmentref) or comm_error();
	};
	# unreachable
}

sub process_task
{
	my ($self, $action, $data, $attachmentref) = @_;
	my ($result, $result_attachmentref) = (undef, undef);

	my $console_out = undef;
	if ($action eq 'create_upload') {
		 # TODO: partsize confusing, need use another name for option partsize. partsize Amazon Upload partsize vs Download 'Range' partsize
		my $req = App::MtAws::GlacierRequest->new($self->{options});
		my $uploadid = $req->create_multipart_upload($data->{partsize}, $data->{relfilename}, $data->{mtime});
		confess unless $uploadid;
		$result = { upload_id => $uploadid };
		$console_out = "Created an upload_id $uploadid";
	} elsif ($action eq "upload_part") {
		my $req = App::MtAws::GlacierRequest->new($self->{options});
		my $r = $req->upload_part($data->{upload_id}, $attachmentref, $data->{start}, $data->{part_final_hash});
		confess "upload_part failed" unless $r;
		$result = { uploaded => $data->{start} } ;
		$console_out = "Uploaded part for $data->{relfilename} at offset [$data->{start}]";
	} elsif ($action eq 'finish_upload') {
		# TODO: move vault to task, not to options!
		my $req = App::MtAws::GlacierRequest->new($self->{options});
		my $archive_id = $req->finish_multipart_upload($data->{upload_id}, $data->{filesize}, $data->{final_hash});
		confess "finish_upload failed" unless $archive_id;
		$result = {
			final_hash => $data->{final_hash},
			archive_id => $archive_id,
			journal_entry => {
				type=> 'CREATED',
				'time' => $req->{last_request_time},
				archive_id => $archive_id,
				size => $data->{filesize},
				mtime => $data->{mtime},
				treehash => $data->{final_hash},
				relfilename => $data->{relfilename}
			},
		};
		$console_out = "Finished $data->{relfilename} hash [$data->{final_hash}] archive_id [$archive_id]";
	} elsif ($action eq 'delete_archive') {
		my $req = App::MtAws::GlacierRequest->new($self->{options});
		my $r = $req->delete_archive($data->{archive_id});
		confess "delete_archive failed" unless $r;
		$result = {
			journal_entry => {
				type=> 'DELETED',
				'time' => $req->{last_request_time},
				archive_id => $data->{archive_id},
				relfilename => $data->{relfilename}
				}
		};
		$console_out = "Deleted $data->{relfilename} archive_id [$data->{archive_id}]";
	} elsif ($action eq 'retrieval_download_job') {
		my $req = App::MtAws::GlacierRequest->new($self->{options});

		my $i_tmp = App::MtAws::IntermediateFile->new(target_file => $data->{filename}, mtime => $data->{mtime});
		my $tempfile = $i_tmp->tempfilename;

		my $r = $req->retrieval_download_job($data->{jobid}, $data->{relfilename}, $tempfile, $data->{size}, $data->{treehash});

		confess "retrieval_download_job failed" unless $r;

		$i_tmp->make_permanent;

		$result = { response => $r };
		$console_out = "Downloaded archive $data->{filename}";
	} elsif ($action eq 'segment_download_job') {
		my $req = App::MtAws::GlacierRequest->new($self->{options});
		my $r = $req->segment_download_job($data->{jobid}, $data->{tempfile}, $data->{filename}, $data->{position}, $data->{download_size});
		confess "segment_download_job failed" unless $r;
		$result = { response => $r };
		$console_out = "Downloaded part of archive $data->{filename} at offset $data->{position}, size $data->{download_size}";
	} elsif ($action eq 'inventory_download_job') {
		my $req = App::MtAws::GlacierRequest->new($self->{options});
		my $r = $req->retrieval_download_to_memory($data->{job_id});
		confess "inventory_download_job failed" unless $r;
		$result = { response => !! $r };
		$result_attachmentref = \$r;
		$console_out = "Downloaded inventory in JSON format";
	} elsif ($action eq 'retrieve_archive') {
		my $req = App::MtAws::GlacierRequest->new($self->{options});
		my $r = $req->retrieve_archive( $data->{archive_id});
		return "retrieve_archive failed" unless $r;
		$result = {
			journal_entry => {
				type=> 'RETRIEVE_JOB',
				'time' => $req->{last_request_time},
				archive_id => $data->{archive_id},
				job_id => $r,
				}
		};
		$console_out = "Retrieved Archive $data->{archive_id}";
	} elsif ($action eq 'retrieval_fetch_job') {
		my $req = App::MtAws::GlacierRequest->new($self->{options});
		my $r = $req->retrieval_fetch_job($data->{marker});
		confess unless $r;
		$result = { response => $r };
		$console_out = "Retrieved Job List";
	} elsif ($action eq 'inventory_fetch_job') {
		my $req = App::MtAws::GlacierRequest->new($self->{options});
		my $r = $req->retrieval_fetch_job($data->{marker});
		confess unless $r;
		$result = { response => $r };
		$console_out = "Fetched job list for inventory retrieval";
	} elsif ($action eq 'retrieve_inventory_job') {
		my $req = App::MtAws::GlacierRequest->new($self->{options});
		my $r = $req->retrieve_inventory();
		confess unless $r;
		$result = { job_id => $r };
		$console_out = "Retrieved Inventory, job id $r";
	} elsif ($action eq 'create_vault_job') {
		my $req = App::MtAws::GlacierRequest->new($self->{options});
		my $r = $req->create_vault($data->{name});
		confess unless $r;
		$result = { };
		$console_out = "Created vault $data->{name}";
	} elsif ($action eq 'delete_vault_job') {
		my $req = App::MtAws::GlacierRequest->new($self->{options});
		my $r = $req->delete_vault($data->{name});
		confess unless $r;
		$result = { };
		$console_out = "Deleted vault $data->{name}";
	} elsif ($action eq 'verify_file') {
		my $th = App::MtAws::TreeHash->new();
		my $binaryfilename = binaryfilename $data->{filename};
		die exception file_is_zero => "File size is zero (and it was not when we read directory listing). Filename: %string filename%",
			filename => $data->{filename}
				unless -s $binaryfilename;

		open_file(my $F, $data->{filename}, mode => '<', binary => 1) or
			die exception upload_file_open_error => "Unable to open task file %string filename% for reading, errno=%errno%",
				filename => $data->{filename}, 'ERRNO'; # TODO: test

		$th->eat_file($F);
		close $F or confess;
		$th->calc_tree();
		my $treehash = $th->get_final_hash();

		if ($treehash eq $data->{treehash}) {
			$result = { match => 1 };
			$console_out = "Checked treehash for $data->{filename} - MATCH";
		} else {
			$result = { match => 0 };
			$console_out = "Checked treehash for $data->{filename} - DOES NOT MATCH";
		}
	} else {
		die $action;
	}
	return ($result, $result_attachmentref, $console_out);
}

sub comm_error
{
	# error message useless here
	exit(1);
}

1;