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package SL::IMAPClient;

use strict;
use warnings;
use utf8;

use IO::Socket::INET;
use IO::Socket::SSL;
use Mail::IMAPClient;
use File::MimeInfo::Magic;
use Encode qw(encode decode);
use Encode::IMAPUTF7;

use SL::SessionFile;
use SL::Locale::String qw(t8);

my %TYPE_TO_FOLDER = (
sales_quotation => t8('Sales Quotations'),
sales_order => t8('Sales Orders'),
);

sub new {
my ($class, %params) = @_;
my $config = $::lx_office_conf{imap_client} || {};
my $self = bless {
enabled => $config->{enabled},
hostname => $config->{hostname},
port => $config->{port},
ssl => $config->{ssl},
username => $config->{username},
password => $config->{password},
base_folder => $config->{base_folder} || 'INBOX',
%params,
}, $class;
return unless $self->{enabled};
$self->_create_imap_client();
return $self;
}

sub DESTROY {
my ($self) = @_;
if ($self->{imap_client}) {
$self->{imap_client}->logout();
}
}

sub update_emails_for_record {
my ($self, $record) = @_;

my $folder_string = $self->_get_folder_string_for_record($record);
return unless $self->{imap_client}->exists($folder_string);
$self->{imap_client}->select($folder_string)
or die "Could not select IMAP folder '$folder_string': $@\n";

my $msg_uids = $self->{imap_client}->messages
or die "Could not messages via IMAP: $@\n";

my $dbh = $record->dbh;
my $query = <<SQL;
SELECT uid
FROM files
WHERE object_id = ?
AND object_type = ?
AND source = 'uploaded'
AND file_type = 'attachment'
SQL
my $existing_uids = $dbh->selectall_hashref($query, 'uid', undef,
$record->id, $record->type);
my @new_msg_uids = grep { !$existing_uids->{$_} } @$msg_uids;

foreach my $msg_uid (@new_msg_uids) {
my $sess_fname = "mail_download_" . $record->type . "_" . $record->id . "_" . $msg_uid;

my $file_name =
decode('MIME-Header', $self->{imap_client}->subject($msg_uid)) . '.eml';
my $sfile = SL::SessionFile->new($sess_fname, mode => 'w');
$self->{imap_client}->message_to_file($sfile->fh, $msg_uid)
or die "Could not fetch message $msg_uid from IMAP: $@\n";
$sfile->fh->close;

my $mime_type = File::MimeInfo::Magic::magic($sfile->file_name);
my $fileobj = SL::File->save(
object_id => $record->id,
object_type => $record->type,
mime_type => $mime_type,
source => 'uploaded',
uid => "$msg_uid",
file_type => 'attachment',
file_name => $file_name,
file_path => $sfile->file_name
);
unlink($sfile->file_name);
}

}

sub create_folder {
my ($self, $folder_name) = @_;
return if $self->{imap_client}->exists($folder_name);
$self->{imap_client}->create($folder_name)
or die "Could not create IMAP folder '$folder_name': $@\n";
return;
}

sub get_folder_string_from_path {
my ($self, $folder_path) = @_;
my $separator = $self->{imap_client}->separator();
my $replace_sep = $separator eq '_' ? '-' : '_';
$folder_path =~ s|\Q${separator}|$replace_sep|g; # \Q -> escape special chars
$folder_path =~ s|/|${separator}|g; # replace / with separator
my $folder_string = encode('IMAP-UTF-7', $folder_path);
return $folder_string;
}

sub create_folder_for_record {
my ($self, $record) = @_;
my $folder_string = $self->_get_folder_string_for_record($record);
$self->create_folder($folder_string);
return;
}

sub _get_folder_string_for_record {
my ($self, $record) = @_;

my $customer_vendor = $record->customervendor;
my $record_folder_path =
$self->{base_folder} . '/' .
$customer_vendor->number . ' ' . $customer_vendor->name . '/' .
$TYPE_TO_FOLDER{$record->type} . '/' .
$record->number;
my $folder_string = $self->get_folder_string_from_path($record_folder_path);
return $folder_string;
}

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

my $socket;
if ($self->{ssl}) {
$socket = IO::Socket::SSL->new(
Proto => 'tcp',
PeerAddr => $self->{hostname},
PeerPort => $self->{port} || 993,
);
} else {
$socket = IO::Socket::INET->new(
Proto => 'tcp',
PeerAddr => $self->{hostname},
PeerPort => $self->{port} || 143,
);
}
if (!$socket) {
die "Failed to create socket for IMAP client: $@\n";
}

my $imap_client = Mail::IMAPClient->new(
Socket => $socket,
User => $self->{username},
Password => $self->{password},
Uid => 1,
peek => 1, # Don't change the \Seen flag
) or do {
die "Failed to create IMAP Client: $@\n"
};

$imap_client->IsAuthenticated() or do {
die "IMAP Client login failed: " . $imap_client->LastError() . "\n";
};

$self->{imap_client} = $imap_client;
return $imap_client;
}

1;


__END__

=pod

=encoding utf8

=head1 NAME

SL::IMAPClient - Base class for interacting with email server from kivitendo

=head1 SYNOPSIS

use SL::IMAPClient;

# uses the config in config/kivitendo.conf
my $imap_client = SL::IMAPClient->new();

# can also be used with a custom config, overriding the global config
my %config = (
enabled => 1,
hostname => 'imap.example.com',
username => 'test_user',
password => 'test_password',
ssl => 1,
base_folder => 'INBOX',
);
my $imap_client = SL::IMAPClient->new(%config);

# create email folder for record
# folder structure: base_folder/customer_vendor_number customer_vendor_name/type/record_number
# e.g. INBOX/1234 Testkunde/Angebot/123
# if the folder already exists, nothing happens
$imap_client->create_folder_for_record($record);

# update emails for record
# fetches all emails from the IMAP server and saves them as attachments
$imap_client->update_emails_for_record($record);

=head1 OVERVIEW

Mail can be sent from kivitendo via the sendmail command or the smtp protocol.


=head1 INTERNAL DATA TYPES

=over 2

=item C<%TYPE_TO_FOLDER>

Due to the lack of a single global mapping for $record->type,
type is mapped to the corresponding translation. All types which
use this module are currently mapped and should be mapped.

=back

=head1 FUNCTIONS

=over 4

=item C<new>

Creates a new SL::IMAPClient object. If no config is passed, the config
from config/kivitendo.conf is used. If a config is passed, the global
config is overridden.

=item C<DESTROY>

Destructor. Disconnects from the IMAP server.

=item C<update_emails_for_record>

Updates the emails for a record. Checks which emails are missing and
fetches these from the IMAP server.

=item C<create_folder>

Creates a folder on the IMAP server. If the folder already exists, nothing
happens.

=item C<get_folder_string_from_path>

Converts a folder path to a folder string. The folder path is like path
on unix filesystem. The folder string is the path on the IMAP server.
The folder string is encoded in IMAP-UTF-7.

=item C<create_folder_for_record>

Creates a folder for a record on the IMAP server. The folder structure
is like this: base_folder/customer_vendor_number customer_vendor_name/type/record_number
e.g. INBOX/1234 Testkunde/Angebot/123
If the folder already exists, nothing happens.

=item C<_get_folder_string_for_record>

Returns the folder string for a record. The folder structure is like this:
base_folder/customer_vendor_number customer_vendor_name/type/record_number
e.g. INBOX/1234 Testkunde/Angebot/123. This is passed through
C<get_folder_string_from_path>.

=item C<_create_imap_client>

Creates a new IMAP client and logs in. The IMAP client is stored in
$self->{imap_client}.

=back

=head1 BUGS

Nothing here yet.

=head1 AUTHOR

Tamino Steinert E<lt>tamino.steinert@tamino.stE<gt>

=cut
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