<?php
/**
 * Text Fine Tuner for Accessibility Audio TTS.
 *
 * @package Accessibility_Audio_TTS\Features\Text_Correction
 */

namespace Accessibility_Audio_TTS\API;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Text Fine Tuner - Coordinator for ChatGPT text optimization.
 *
 * Single Responsibility: Coordinating text optimization through specialized services.
 */
class Text_Fine_Tuner {

	/**
	 * Configuration manager instance.
	 *
	 * @var ChatGPT_Config_Manager
	 */
	private $config_manager;

	/**
	 * Prompt manager instance.
	 *
	 * @var ChatGPT_Prompt_Manager
	 */
	private $prompt_manager;

	/**
	 * API client instance.
	 *
	 * @var ChatGPT_API_Client|null
	 */
	private $api_client;

	/**
	 * Text processor instance.
	 *
	 * @var ChatGPT_Text_Processor|null
	 */
	private $text_processor;

	/**
	 * API tester instance.
	 *
	 * @var ChatGPT_API_Tester|null
	 */
	private $api_tester;

	/**
	 * Constructor with dependency injection.
	 *
	 * @param string|null $api_key       Optional API key override.
	 * @param string|null $custom_prompt Optional custom prompt override.
	 */
	public function __construct( $api_key = null, $custom_prompt = null ) {
		// Initialize specialized managers.
		$this->config_manager = new ChatGPT_Config_Manager( $api_key );
		$this->prompt_manager = new ChatGPT_Prompt_Manager( $custom_prompt );

		// Initialize API client if config is available.
		if ( $this->config_manager->is_available() ) {
			$this->api_client     = new ChatGPT_API_Client( $this->config_manager->get_api_key() );
			$this->text_processor = new ChatGPT_Text_Processor( $this->api_client, $this->prompt_manager );
			$this->api_tester     = new ChatGPT_API_Tester( $this->text_processor, $this->config_manager );
		}
	}

	/**
	 * Check if the fine tuner is available (has API key).
	 *
	 * @return bool True if available.
	 */
	public function is_available() {
		return $this->config_manager && $this->config_manager->is_available();
	}

	/**
	 * Fine-tune text for better audio generation.
	 *
	 * @param string $text Text to fine-tune.
	 * @return array Result with fine-tuned text and usage data.
	 */
	public function fine_tune_text( $text ) {
		if ( ! \Accessibility_Audio_TTS\Core\Privacy_Settings::openai_enabled() || ! $this->text_processor ) {
			accessibility_audio_tts_debug_log( 'ChatGPT text processor not available - skipping text optimization', true );
			return array(
				'success'   => true,
				'text'      => $text,
				'optimized' => false,
				'usage'     => null,
			);
		}

		return $this->text_processor->fine_tune_text( $text );
	}

	/**
	 * Test API connection.
	 *
	 * @return array Test result.
	 */
	public function test_api_connection() {
		if ( ! $this->api_tester ) {
			return array(
				'success' => false,
				'error'   => 'API tester not available',
			);
		}

		return $this->api_tester->test_api_connection();
	}

	/**
	 * Get default prompt for text optimization.
	 *
	 * @return string Default prompt.
	 */
	public function get_default_prompt() {
		return $this->prompt_manager ? $this->prompt_manager->get_default_prompt() : '';
	}

	/**
	 * Validate API key format.
	 *
	 * @param string $api_key API key to validate.
	 * @return bool True if valid.
	 */
	public static function validate_api_key( $api_key ) {
		$config_manager = new ChatGPT_Config_Manager();
		return $config_manager->validate_api_key( $api_key );
	}

	/**
	 * Update API settings.
	 *
	 * @param string $api_key       API key.
	 * @param string $custom_prompt Custom prompt.
	 * @return bool Success status.
	 */
	public function update_settings( $api_key, $custom_prompt = '' ) {
		$success = true;

		if ( $this->config_manager ) {
			$success = $this->config_manager->update_api_key( $api_key ) && $success;
		}

		if ( $this->prompt_manager ) {
			$success = $this->prompt_manager->update_prompt( $custom_prompt ) && $success;
		}

		// Reinitialize components if API key changed.
		if ( $success && $this->config_manager->is_available() ) {
			$this->api_client     = new ChatGPT_API_Client( $this->config_manager->get_api_key() );
			$this->text_processor = new ChatGPT_Text_Processor( $this->api_client, $this->prompt_manager );
			$this->api_tester     = new ChatGPT_API_Tester( $this->text_processor, $this->config_manager );
		}

		return $success;
	}

	/**
	 * Get current settings.
	 *
	 * @return array Current settings.
	 */
	public function get_settings() {
		$config_settings = $this->config_manager ? $this->config_manager->get_settings() : array();
		$prompt_settings = $this->prompt_manager ? $this->prompt_manager->get_prompt_settings() : array();

		return array_merge( $config_settings, $prompt_settings );
	}

	/**
	 * Clean and reset API key (fix for corrupted 164-character key).
	 *
	 * @param string $new_key New API key.
	 * @return bool Success status.
	 */
	public static function clean_and_reset_api_key( $new_key ) {
		$config_manager = new ChatGPT_Config_Manager();
		return $config_manager->clean_and_reset_api_key( $new_key );
	}
}