<?php


 /**
 * transcribe_openai class
 *
 * @method null download
 */
if (!class_exists('transcribe_openai')) {
	class transcribe_openai implements transcribe_interface {

		/**
		 * declare private variables
		 */
		private $api_key;
		private $api_url;
		public  $api_model;
		private $path;
		private $filename;
		private $audio_string;
		private $audio_mime_type;
		private $format;
		private $voice;
		private $message;
		private $model;
		private $language;

		/**
		 * called when the object is created
		 */
		public function __construct($settings) {

			//build the setting object and get the recording path
			$this->api_key = $settings->get('transcribe', 'api_key', '');
			$this->api_url = $settings->get('transcribe', 'api_url', '');
			$this->api_model = $settings->get('transcribe', 'api_model', 'whisper-1');

		}

		public function set_path(string $audio_path) {
			$this->path = $audio_path;
		}

		public function set_filename(string $audio_filename) {
			$this->filename = $audio_filename;
		}

		public function set_audio_string(string $audio_string) {
			$this->audio_string = $audio_string;
		}

		public function set_audio_mime_type(string $audio_mime_type) {
			$this->audio_mime_type = $audio_mime_type;
		}

		public function set_format(string $audio_format) {
			$this->format = $audio_format;
		}

		public function set_voice(string $audio_voice) {
			$this->voice = $audio_voice;
		}

		public function set_language(string $audio_language) {
			$this->language = $audio_language;
		}

		public function set_translate(string $audio_translate) {
			$this->translate = $audio_translate;
		}

		public function set_message(string $audio_message) {
			$this->message = $audio_message;
		}

		public function is_language_enabled() : bool {
			//return the whether engine is handles languages
			return false;
		}

		public function is_translate_enabled() : bool {
			//return the whether engine is able to translate
			return false;
		}

		public function get_voices() : array {
			$voices = array(
				"alloy" => "alloy",
				"echo" => "echo",
				"fable" => "fable",
				"nova" => "nova",
				"onyx" => "onyx",
				"shimmer" => "shimmer"
			);

			//return the languages array
			return $voices;
		}

		public function get_languages() : array {
			//create the languages array
			$languages = array(
				"af" => "Afrikaans",
				"ar" => "Arabic",
				"hy" => "Armenian",
				"az" => "Azerbaijani",
				"be" => "Belarusian",
				"bs" => "Bosnian",
				"bg" => "Bulgarian",
				"ca" => "Catalan",
				"zh" => "Chinese",
				"hr" => "Croatian",
				"cs" => "Czech",
				"da" => "Danish",
				"nl" => "Dutch",
				"en" => "English",
				"et" => "Estonian",
				"fi" => "Finnish",
				"fr" => "French",
				"gl" => "Galician",
				"de" => "German",
				"el" => "Greek",
				"he" => "Hebrew",
				"hi" => "Hindi",
				"hu" => "Hungarian",
				"is" => "Icelandic",
				"id" => "Indonesian",
				"it" => "Italian",
				"ja" => "Japanese",
				"kn" => "Kannada",
				"kk" => "Kazakh",
				"ko" => "Korean",
				"lv" => "Latvian",
				"lt" => "Lithuanian",
				"mk" => "Macedonian",
				"ms" => "Malay",
				"mr" => "Marathi",
				"mi" => "Maori",
				"ne" => "Nepali",
				"no" => "Norwegian",
				"fa" => "Persian",
				"pl" => "Polish",
				"pt" => "Portuguese",
				"ro" => "Romanian",
				"ru" => "Russian",
				"sr" => "Serbian",
				"sk" => "Slovak",
				"sl" => "Slovenian",
				"es" => "Spanish",
				"sw" => "Swahili",
				"sv" => "Swedish",
				"tl" => "Tagalog",
				"ta" => "Tamil",
				"th" => "Thai",
				"tr" => "Turkish",
				"uk" => "Ukrainian",
				"ur" => "Urdu",
				"vi" => "Vietnamese",
				"cy" => "Welsh"
			);

			//return the languages array
			return $languages;
		}

		/**
		 * transcribe - speech to text
		 */
		public function transcribe() : string {

			// Use the curl command line for debuging
			//echo "/usr/bin/curl --request POST ";
			//echo " --url 'https://api.openai.com/v1/audio/transcriptions' ";
			//echo " --header 'Authorization: Bearer ".$this->api_key."' ";
			//echo " --header 'Content-Type: multipart/form-data' ";
			//echo " --form 'file=@".$this->path.'/'.$this->filename."' ";
			//echo " --form 'model=whisper-1' ";
			//echo " --form 'response_format=text' ";
			//echo "\n";

			//start output buffer
			ob_start();
			$out = fopen('php://output', 'w');

			// initialize a curl handle
			$ch = curl_init();

			// set the api_url if not already set
			if (empty($this->api_url)) {
				$this->api_url = 'https://api.openai.com/v1/audio/transcriptions';
			}

			// set the URL for the request
			curl_setopt($ch, CURLOPT_URL, $this->api_url);

			// set the request method to POST
			curl_setopt($ch, CURLOPT_POST, true);

			// set the request headers
			curl_setopt($ch, CURLOPT_HTTPHEADER, array(
				'Authorization: Bearer '.$this->api_key,
				'Content-Type: multipart/form-data'
			));

			// prepare the HTTP POST data
			if (file_exists($this->path.'/'.$this->filename)) {
				//send the audio from the file system
				$post_data['file'] = new CURLFile($this->path.'/'.$this->filename);
			}
			elseif (!empty($this->audio_string)) {
				//send the audio from as a string
				$post_data['file'] = new CURLStringFile($this->audio_string, $this->filename, $this->audio_mime_type);
			}
			else {
				//audio file or string not found
				return false;
			}

			$post_data['model'] = $this->api_model;
			$post_data['response_format'] = 'text';
			curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);

			// return the response as a string instead of outputting it directly
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

			// set the connection timeout and the overall maximum curl run time
			curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
			curl_setopt($ch, CURLOPT_TIMEOUT, 300);

			// follow any "Location: " header the server sends as part of the HTTP header.
			curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);

			// automatically set the Referer: field in requests where it follows a Location: redirect.
			curl_setopt($ch, CURLOPT_AUTOREFERER, TRUE);

			// set whether to verify SSL peer
			curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, TRUE);

			// add verbose for debugging
			curl_setopt($ch, CURLOPT_VERBOSE, true);
			curl_setopt($ch, CURLOPT_STDERR, $out);

			// run the curl request and transcription message
			$this->message = curl_exec($ch);

			// show the debug information
			fclose($out);

			// check for errors
			if (curl_errno($ch)) {
				echo 'Error: ' . curl_error($ch);
				exit;
			}

			// close the handle
			curl_close($ch);

			// return the transcription
			if (empty($this->message)) {
				return '';
			}
			else {
				return trim($this->message);
			}
		}

		public function set_model(string $model): void {
			if (array_key_exists($model, $this->get_models())) {
				$this->api_model = $model;
			}
		}

		public function get_models(): array {
			return [
				'tts-1-hd' => 'tts-1-hd'
			];
		}

	}
}

?>