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package Business::Bitpay;

use strict;
use warnings;

use 5.008_001;
our $VERSION = '0.05';
eval $VERSION;

use HTTP::Request;
use URI;
use JSON qw(encode_json decode_json);
use LWP::UserAgent;
require Carp;

sub new {
    my ($class, $api_key, @args) = @_ or Carp::croak("api key missed");

    bless {
        key     => $api_key,
        gateway => 'https://bitpay.com/api/',
        ua      => LWP::UserAgent->new,
        @args
    }, $class;
}

sub prepare_request {
    my ($self, $api, $data) = @_;

    my $uri = URI->new($self->{gateway});
    $uri->userinfo($self->{key} . ':');
    $uri->path($uri->path . $api);

    my $method = 'GET';
    my @fields;
    if ($data) {
        $method = 'POST';
        $data   = encode_json $data;
        push @fields, 'Content-Type' => 'application/json';
    }

    my $request = HTTP::Request->new(
        $method => $uri, [
            'User-Agent'   => 'bitpay api',
            'X-BitPay-Plugin-Info' => 'perl' . $VERSION,
            @fields,
        ],
        $data
    );
    $request;
}

sub request {
    my $self = shift;

    my $http_response = $self->{ua}->request($self->prepare_request(@_));
    Carp::croak($http_response->status_line)
      unless $http_response->is_success;

    my $response = decode_json($http_response->decoded_content);

    if (my $error = $response->{error}) {
        my $messages = $error->{messages};
        Carp::croak("$error->{message}: ",
            join(', ', map {"$_ ($messages->{$_})"} keys %$messages));
    }

    $response;
}


sub create_invoice {
    my ($self, %args) = @_;

    Carp::croak('price missed')    unless exists $args{price};
    Carp::croak('currency missed') unless exists $args{currency};

    $self->request('invoice', \%args);
}

sub get_invoice {
    my ($self, $id) = @_;

    $self->request("invoice/$id");
}

1;
__END__

=head1 NAME

Business::Bitpay - Bitpay API

=head1 SYNOPSIS

    use Business::Bitpay;
    my $bitpay = Business::Bitpay->new($api_key);

    # create new invoice
    $invoice = $bitpay->create_invoice(price => 10, currency => 'USD');

    # get invoice data