#!/usr/bin/perl

use Modern::Perl;

# Клиент для Дарсана, версия 2
# Ю. Жиловец, 17.02.2015
# Версия 3
# Ю. Жиловец, 1.05.2023

package darsan_client;

use Mojo::UserAgent;
use URI::Query;
use Mojo::JSON qw/j/;
use Data::Dumper;
use utf8;

sub new
{
  my $class = shift;
  my $auth = shift;
  my $tpl = shift;

  return bless {auth=>$auth,tpl=>$tpl,error=>undef, ua => new Mojo::UserAgent}, $class;
}

sub source_ip
{
  my $self = shift;
  my $ip = shift;
  $self->{ua}->local_address($ip);
}

sub error
{
  return $_[0]->{error};
}

sub _query
{
  my $self = shift;
  my $is_promise = shift;
  my $method = shift;
  my @args = @_;

  undef $self->{error};

  my $is_raw = 0;
  if ($method eq "GET_RAW")
  {
    $method = "GET";
    $is_raw = 1;
  }

  my $tx = $self->{ua}->build_tx($method, @args);
  
  if ($is_promise)
  {
    return $self->_promise_query($tx, $is_raw);
  }
  else
  {
    return $self->_sync_query($tx, $is_raw);
  }
}

sub _sync_query
{
  my $self = shift;
  my $tx = shift;
  my $is_raw = shift;
  
  my $token = $self->{auth}->token;
  if ($self->{auth}->error)
  {
    $self->{error} = $self->{auth}->error;
    return undef;
  }

  $tx->req->headers->authorization("Darsan2 $token");
  $tx = $self->{ua}->start($tx);
  my ($error, $body) = $self->_parse_reply($tx);
  
  if ($error)
  {
    $self->{error} = $error;
    return undef;
  }

  return $is_raw ? $tx->result : $body;
}

sub _promise_query
{
  my $self = shift;
  my $tx = shift;
  my $is_raw = shift;

  return $self->{auth}->token_p->then(sub
  {
    my $token = shift;
    $tx->req->headers->authorization("Darsan2 $token");
    $self->{ua}->start_p($tx)
  })->catch(sub
  {  
    my $err = shift;
    die $err if ref $err;
    die {code=>500, body=>"", url=>$tx->req->url."", message=>$err};
  })
  ->then(sub
  { 
    my $tx = shift;
    my ($error, $body) = $self->_parse_reply($tx);

    die $error if $error;
    return $is_raw ? $tx->result : $body;
  });
}

sub _parse_reply
{
  my $self = shift;
  my $tx = shift;

  my $body = $tx->res->body;
  my $cont = $tx->res->headers->content_type;
  $body = j($body) if $cont  && ($cont =~ m|^application/json| || $cont =~ m|^application/error\+json|);

  if (my $e = $tx->error)
  {
    $e->{code} ||= 500;
    my $err = {url=>$tx->req->url."", code=>$e->{code}, message=>$e->{message}, body=>$body};
    return ($err);
  }

  return (undef, $body);
}


sub get
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};
  
  my $q = URI::Query->new($params);
  $q = "?$q" if $q;
  my $url = $self->_make_server($topic).$path.$q;
  return $self->_query(0, GET => $url);
}

sub get_p
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};

  my $q = URI::Query->new($params);
  $q = "?$q" if $q;
  my $url = $self->_make_server($topic).$path.$q;
  return $self->_query(1, GET => $url);
}

sub get_raw
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};
            
  my $q = URI::Query->new($params);
  $q = "?$q" if $q;
  my $url = $self->_make_server($topic).$path.$q;
  return $self->_query(0, GET_RAW => $url);
}

sub get_raw_p
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};
            
  my $q = URI::Query->new($params);
  $q = "?$q" if $q;
  my $url = $self->_make_server($topic).$path.$q;
  return $self->_query(1, GET_RAW => $url);
}

sub post
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};
  
  my $url = $self->_make_server($topic).$path;
  return $self->_query(0, POST => $url => form => $params);
}

sub post_p
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};

  my $url = $self->_make_server($topic).$path;
  return $self->_query(1, POST => $url => form => $params);
}

sub post_json
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};
  
  my $url = $self->_make_server($topic).$path;
  return $self->_query(0, POST => $url => { "Content-Type"=>"application/json" } => j($params));
}

sub post_json_p
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};
  
  my $url = $self->_make_server($topic).$path;
  return $self->_query(1, POST => $url => { "Content-Type"=>"application/json" } => j($params));
}

sub delete
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};

  my $url = $self->_make_server($topic).$path;
  return $self->_query(0, DELETE => $url => form => $params);
}

sub delete_p
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};

  my $url = $self->_make_server($topic).$path;
  return $self->_query(1, DELETE => $url => form => $params);
}

sub put
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};
  
  my $url = $self->_make_server($topic).$path;
  return $self->_query(0, PUT => $url => form => $params);
}

sub put_p
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};

  my $url = $self->_make_server($topic).$path;
  return $self->_query(1, PUT => $url => form => $params);
}

sub put_json
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};
  
  my $url = $self->_make_server($topic).$path;
  return $self->_query(0, PUT => $url => { "Content-Type"=>"application/json" } => j($params));
}

sub put_json_p
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};

  my $url = $self->_make_server($topic).$path;
  return $self->_query(1, PUT => $url => { "Content-Type"=>"application/json" } => j($params));
}

sub patch
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};

  my $url = $self->_make_server($topic).$path;
  return $self->_query(0, PATCH => $url => form => $params);
}

sub patch_json
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};

  my $url = $self->_make_server($topic).$path;
  return $self->_query(0, PATCH => $url => { "Content-Type"=>"application/json" } => j($params));
}

sub patch_p
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};

  my $url = $self->_make_server($topic).$path;
  return $self->_query(1, PATCH => $url => form => $params);
}

sub patch_json_p
{
  my $self = shift;
  my $topic = shift;
  my $path = shift;
  my $params = shift || {};

  my $url = $self->_make_server($topic).$path;
  return $self->_query(1, PATCH => $url => { "Content-Type"=>"application/json" } => j($params));
}

sub map
{
  my $self = shift;
  my $map = shift;
  $self->{map} = $map;
}

sub _make_server
{
  my $self = shift;
  my $topic = shift;

  return $self->{map}->{$topic} if $self->{map} && exists $self->{map}->{$topic};

  my $server = $self->{tpl};
  $server =~ s/\{entity\}/$topic/;
  $server =~ s/darsan-darsan/darsan/;

  return $server;
}

sub clone
{
  my $self = shift;
  return bless { %$self }, "darsan_client";
}

sub auth
{
  my $self = shift;
  my $auth = shift;
  $self->{auth} = $auth;
  return $self;
}

1;