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package AI::Image;

use strict;
use warnings;

use strict;
use warnings;

use Carp;
use HTTP::Tiny;
use JSON::PP;

our $VERSION = '0.1';
$VERSION = eval $VERSION;

my $http = HTTP::Tiny->new;

# Create Image object
sub new {
    my $class = shift;
    my %attr  = @_;

    $attr{'error'}      = '';

    $attr{'api'}        = 'OpenAI' unless $attr{'api'};
    $attr{'error'}      = 'Invalid API' unless $attr{'api'} eq 'OpenAI';
    $attr{'error'}      = 'API Key missing' unless $attr{'key'};

    $attr{'model'}      = 'dall-e-2' unless $attr{'model'};
    $attr{'size'}       = '512x512'  unless $attr{'size'};

    return bless \%attr, $class;
}

# Define endpoints for APIs
my %url    = (
    'OpenAI' => 'https://api.openai.com/v1/images/generations',
);

# Define HTTP Headers for APIs
my %header = (
    'OpenAI' => &_get_header_openai,
);

# Returns true if last operation was success
sub success {
    my $self = shift;
    return !$self->{'error'};
}

# Returns error if last operation failed
sub error {
    my $self = shift;
    return $self->{'error'};
}

# Header for calling OpenAI
sub _get_header_openai {
    my $self = shift;
    $self->{'key'} = '' unless defined $self->{'key'};
    return {
         'Authorization' => 'Bearer ' . $self->{'key'},
         'Content-type'  => 'application/json'
     };
 }

# Get URL from image prompt
sub image {
    my ($self, $prompt) = @_;

    my $response = $http->post($url{$self->{'api'}}, {
         'headers' => {
             'Authorization' => 'Bearer ' . $self->{'key'},
             'Content-type'  => 'application/json'
         },
         content => encode_json {
             model          => $self->{'model'},
             size           => $self->{'size'},
             prompt         => $prompt,
         }
     });
     if ($response->{'content'} =~ 'invalid_api_key') {
         croak 'Incorrect API Key - check your API Key is correct';
     }
     
     if ($self->{'debug'} and !$response->{'success'}) {
         croak $response if $self->{'debug'} eq 'verbose';
         croak $response->{'content'};
     }

     my $reply = decode_json($response->{'content'});

     return $reply->{'data'}[0]->{'url'};
}

__END__

=head1 NAME

AI::Image - Generate images using OpenAI's DALL-E

=head1 VERSION

Version 0.1

=head1 SYNOPSIS

    use AI::Image;

    my $ai = AI::Image->new(
        'key'   => 'sk-......',
    );
    
    my $image_url = $ai->image("A photorealistic image of a cat wearing a top hat and monocle.");

    print $image_url;

=head1 DESCRIPTION

This module provides a simple interface to generate images using OpenAI's DALL-E API.

=head1 API KEYS

A free OpenAI API can be obtained from L<https://platform.openai.com/account/api-keys>

=head1 MODELS

Although the API Key is free, each use incurs a cost.  This is dependent on the