package NGCP::BulkProcessor::RestConnectors::NGCPRestApi;
use strict;

## no critic

use threads qw();
use threads::shared qw(shared_clone);

use HTTP::Status qw(:constants :is status_message);

use Encode qw();

use JSON -support_by_pp, -no_export;
use IO::Uncompress::Unzip qw();

use NGCP::BulkProcessor::Globals qw(
    $LongReadLen_limit
    $working_path
);
use NGCP::BulkProcessor::Logging qw(
    getlogger
    restdebug
    restinfo
);
use NGCP::BulkProcessor::LogError qw(
    resterror
    restwarn
    restrequesterror
    restresponseerror
    fileerror
);

use NGCP::BulkProcessor::RestConnector qw(_add_headers convert_bools);

use NGCP::BulkProcessor::Calendar qw(get_fake_now_string);

use NGCP::BulkProcessor::Utils qw(makepath cleanupdir booltostring);

require Exporter;
our @ISA = qw(Exporter NGCP::BulkProcessor::RestConnector);
our @EXPORT_OK = qw(
    $ITEM_REL_PARAM
    cleanupcertfiles
);

my $defaulturi = 'https://127.0.0.1:443';
my $defaultusername = 'administrator';
my $defaultpassword = 'administrator';
my $defaultrealm = 'api_admin_http';
my $defaultcrtauth = 1;
my $API_CERT_DIR = 'apicerts/';
my $API_CERT_FILENAME_FORMAT = '%s%s.pem';

my $default_collection_page_size = 10;
my $first_collection_page_num = 1;
my $first_page_num = 1;

my $contenttype = 'application/json';
my $patchcontenttype = 'application/json-patch+json';

my $defaultfaketime = 0;
my $faketime_header = 'X-Fake-Clienttime';

our $ITEM_REL_PARAM = 'item_rel';
#my $logger = getlogger(__PACKAGE__);

my $request_charset = 'utf-8';
my $response_charset = 'utf-8';

my $timeout = 5*60;

sub _get_api_cert_dir {
    return $working_path . $API_CERT_DIR;
}

sub cleanupcertfiles {

    return cleanupdir(_get_api_cert_dir(),1,\&filewarn,getlogger(__PACKAGE__));

}

sub new {

    my $class = shift;

    my $self = NGCP::BulkProcessor::RestConnector->new(@_);

    bless($self,$class);

    my $lock :shared;
    $self->{lock_ref} = \$lock;

    $self->setup();

    restdebug($self,__PACKAGE__ . ' connector created',getlogger(__PACKAGE__));

    return $self;

}

sub setup {

    my $self = shift;
    my ($baseuri,$username,$password,$realm,$crtauth,$faketime) = @_;
    $self->baseuri($baseuri // $defaulturi);
    $self->{username} = $username // $defaultusername;
    $self->{password} = $password // $defaultpassword;
    $self->{realm} = $realm // $defaultrealm;
    $self->{faketime} = $faketime // $defaultfaketime;

    $self->{crtauth} = $crtauth // $defaultcrtauth;
    $self->{crt_path} = undef;

}

sub connectidentifier {

    my $self = shift;
    if ($self->{uri}) {
        return ($self->{username} ? $self->{username} . '@' : '') . $self->{uri};
    } else {
        return undef;
    }

}

sub _setup_ua {

    my $self = shift;
    my ($ua,$netloc) = @_;
    $ua->ssl_opts(
		verify_hostname => 0,
		SSL_verify_mode => 0,
	);
    $ua->timeout($timeout) if $timeout;
    if ($self->{username}) {
        $ua->credentials($netloc, $self->{realm}, $self->{username}, $self->{password});
    }
    $self->_init_ssl_cert($ua) if $self->{crtauth};
    restdebug($self,"ua configured",getlogger(__PACKAGE__));

}

sub _init_ssl_cert {
    my ($self, $ua) = @_;
    lock ${$self->{lock_ref}};
    if (not defined $self->{crt_path}) { #($crtauth // $defaultcrtauth) && $self->{username}) {
        makepath(_get_api_cert_dir(),\&fileerror,getlogger(__PACKAGE__));
        $self->{crt_path} = sprintf($API_CERT_FILENAME_FORMAT,_get_api_cert_dir(),$self->{username}=~s/[^a-z0-9 _]/_/gir);
    }
    unless(-f $self->{crt_path}) {
        my $res = $ua->post(
            $self->_get_request_uri('/api/admincerts/'),
            Content_Type => $contenttype,
            Content => '{}'
        );
        if ($res->is_success) {
            my $zip = $res->decoded_content;
            my $z = IO::Uncompress::Unzip->new(\$zip, MultiStream => 0, Append => 1);
            my $data;
            while(!$z->eof() && (my $hdr = $z->getHeaderInfo())) {
                unless($hdr->{Name} =~ /\.pem$/) {
                    # wrong file, just read stream, clear buffer and try next
                    while($z->read($data) > 0) {}
                    $data = undef;
                    $z->nextStream();
                    next;
                }
                while($z->read($data) > 0) {}
                last;
            }
            $z->close();
            if ($data) {
                if (open(my $fh,">:raw",$self->{crt_path})) {
                    print $fh $data;
                    close $fh;
                    restdebug($self,"$self->{crt_path} saved",getlogger(__PACKAGE__));
                } else {
                    fileerror("failed to open $self->{crt_path}: $!",getlogger(__PACKAGE__));
                }
            } else {
                resterror($self,'failed to find PEM file in client certificate zip file',getlogger(__PACKAGE__));
            }
        } else {
            resterror($self,'failed to fetch client certificate: '. $res->code . ' ' . $res->message,getlogger(__PACKAGE__));
        }
    } else {
        restdebug($self,"$self->{crt_path} found",getlogger(__PACKAGE__));
    }
    $ua->ssl_opts(
        SSL_cert_file => $self->{crt_path},
        SSL_key_file => $self->{crt_path},
    );
}

sub _encode_request_content {
    my $self = shift;
    my ($data) = @_;
    return Encode::encode($request_charset,JSON::to_json($data,{ allow_nonref => 1, allow_blessed => 1, convert_blessed => 1, pretty => 0, }));
}

sub _decode_response_content {
    my $self = shift;
    my ($data) = @_;
    my $decoded;
    $decoded = JSON::from_json(Encode::decode($response_charset,$data),{ allow_nonref => 1, }) if $data;
    convert_bools($decoded);
    return $decoded // $data;
}

sub _add_post_headers {
    my $self = shift;
    my ($req,$headers) = @_;
    _add_headers($req,{
       'Content-Type' => $contenttype,
       ($self->{faketime} ? ($faketime_header => get_fake_now_string()) : ()),
    });
    # allow providing custom headers to post(),
    # e.g { 'X-Fake-Clienttime' => ... }
    $self->SUPER::_add_post_headers($req,$headers);
}

sub _add_get_headers {
    my $self = shift;
    my ($req,$headers) = @_;
    _add_headers($req,{
       ($self->{faketime} ? ($faketime_header => get_fake_now_string()) : ()),
    });
    $self->SUPER::_add_get_headers($req,$headers);
}

sub _add_patch_headers {
    my $self = shift;
    my ($req,$headers) = @_;
    _add_headers($req,{
       'Prefer' => 'return=representation',
       'Content-Type' => $patchcontenttype,
       ($self->{faketime} ? ($faketime_header => get_fake_now_string()) : ()),
    });
	$self->SUPER::_add_patch_headers($req,$headers);
}

sub _encode_patch_content {
    my $self = shift;
    my ($data) = @_;
    return JSON::to_json(
		[ map { local $_ = $_; { op => 'replace', path => '/'.$_ , value => $data->{$_} }; } keys %$data ]
	);
}

sub _add_put_headers {
    my $self = shift;
    my ($req,$headers) = @_;
    _add_headers($req,{
       'Prefer' => 'return=representation',
       'Content-Type' => $contenttype,
       ($self->{faketime} ? ($faketime_header => get_fake_now_string()) : ()),
    });
	$self->SUPER::_add_put_headers($req,$headers);
}

sub _add_delete_headers {
    my $self = shift;
    my ($req,$headers) = @_;
    _add_headers($req,{
       ($self->{faketime} ? ($faketime_header => get_fake_now_string()) : ()),
    });
    $self->SUPER::_add_delete_headers($req,$headers);
}

sub _get_page_num_query_param {
    my $self = shift;
    my ($page_num) = @_;
    if (defined $page_num and length($page_num) > 0) {
        return 'page=' . $page_num;
    }
    return undef;
    #if (defined $page_num) {
    #    $page_num += $first_page_num;
    #} else {
    #    $page_num = $first_page_num;
    #}
    #return (defined $page_num ? 'p=' . $page_num : undef);
}

sub _get_page_size_query_param {
    my $self = shift;
    my ($page_size) = @_;
    $page_size //= $default_collection_page_size;
    return 'size=' . $page_size;
}

sub _get_total_count_expected_query_param {
    my $self = shift;
    my ($total_count_expected) = @_;
    return ($total_count_expected ? '' : 'no_count=' . booltostring(1));
}

sub extract_collection_items {
    my $self = shift;
    my ($data,$page_size,$page_num,$params) = @_;
    my $result = undef;
    if (defined $data and 'HASH' eq ref $data
        and defined $data->{'_embedded'} and 'HASH' eq ref $data->{'_embedded'}) {
        $result = $data->{'_embedded'}->{$params->{$ITEM_REL_PARAM}};
        if ('ARRAY' eq ref $result) {

        } elsif ('HASH' eq ref $result) {
            $result = [ $result ];
        } else {
            undef $result;
        }
    }
    $result //= [];
    return shared_clone($result);
}

sub get_defaultcollectionpagesize {
    my $self = shift;
    return $default_collection_page_size;
}

sub get_firstcollectionpagenum {
    my $self = shift;
    return $first_collection_page_num;
}

sub _request_error {
    my $self = shift;
    my $msg = undef;
    if (defined $self->responsedata()
        and 'HASH' eq ref $self->responsedata()) {
        $msg = $self->responsedata()->{'message'};
    }
    resterror($self,$self->response->code . ' ' . $self->response->message .
              (defined $msg && length($msg) > 0 ? ': ' . $msg : ''),getlogger(__PACKAGE__));
}

sub _extract_ids_from_response_location {

    my $self = shift;
    my $location = $self->response()->header('Location');
    my @ids = ();
    foreach my $segment (split('/',$location)) {
        push(@ids,$segment) if $segment =~ /^\d+$/;
    }
    return @ids;

}

sub get {
    my $self = shift;
    if ($self->_get(@_)->code() != HTTP_OK) {
        $self->_request_error();
        return undef;
    } else {
        return $self->responsedata();
    }
}

sub post {
    my $self = shift;
    if ($self->_post(@_)->code() != HTTP_CREATED) {
        $self->_request_error();
        return ();
    } else {
        return $self->_extract_ids_from_response_location();
    }
}

sub post_get {
    my $self = shift;
    my ($path_query,$post_headers,$get_headers) = @_;
    if ($self->_post($path_query,$post_headers)->code() != HTTP_CREATED) {
        $self->_request_error();
        return undef;
    } else {
        my @ids = $self->_extract_ids_from_response_location();
        my $item = $self->get($self->response()->header('Location'),$get_headers);
        $item->{id} = $ids[0] if (scalar @ids) > 0;
        return $item;
    }
}

sub put {
    my $self = shift;
    if ($self->_put(@_)->code() != HTTP_OK) {
        $self->_request_error();
        return undef;
    } else {
        return $self->responsedata();
    }
}

sub patch {
    my $self = shift;
    if ($self->_patch(@_)->code() != HTTP_OK) {
        $self->_request_error();
        return undef;
    } else {
        return $self->responsedata();
    }
}

sub delete {
    my $self = shift;
    if ($self->_delete(@_)->code() != HTTP_NO_CONTENT) {
        $self->_request_error();
        return 0;
    } else {
        return 1;
    }
}

sub faketime {
    my $self = shift;
    if (@_) {
        $self->{faketime} = shift;
        restdebug($self,"fake time " . ($self->{faketime} ? 'enabled' : 'disabled'),getlogger(__PACKAGE__));
    }
    return $self->{faketime};
}

1;