<?php
/**
 * API Key validation helper for AI Story Maker.
 *
 * @package AI_Story_Maker
 * @author  Hayan Mamoun
 * @license GPLv2 or later
 * @link    https://github.com/hmamoun/ai-story-maker/wiki
 * @since   0.1.0
 */

// phpcs:disable WordPress.Files.FileName.NotClassName
// phpcs:disable WordPress.Files.FileName.NotClass

namespace exedotcom\aistorymaker;

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

/**
 * Class AISTMA_API_Keys
 *
 * Provides static methods to validate external API keys (OpenAI, Unsplash).
 *
 * @since 0.1.0
 */
class AISTMA_API_Keys {


	/**
	 * Validates the Unsplash API key.
	 *
	 * @since 0.1.0
	 *
	 * @param  string $api_key The Unsplash API key.
	 * @return bool True if the key is valid, false otherwise.
	 */
	public static function aistma_validate_aistma_unsplash_api_key( $api_key ) {
		$api_key = sanitize_text_field( wp_unslash( $api_key ) );

		// Check format (32-char alphanumeric).
		if ( ! preg_match( '/^[a-zA-Z0-9]{32}$/', $api_key ) ) {
			return false;
		}

		$url      = 'https://api.unsplash.com/photos/random?client_id=' . rawurlencode( $api_key );
		$response = wp_remote_get( $url, array( 'timeout' => 5 ) );

		return ! is_wp_error( $response ) && wp_remote_retrieve_response_code( $response ) === 200;
	}

	/**
	 * Validates the OpenAI API key and optionally stores available model IDs in session.
	 *
	 * @since 0.1.0
	 *
	 * @param  string $api_key The OpenAI API key.
	 * @return bool True if the key is valid or empty (gracefully), false on failure.
	 */
	public static function aistma_validate_aistma_openai_api_key( $api_key ) {
		$api_key = sanitize_text_field( wp_unslash( $api_key ) );

		if ( '' === $api_key ) {
			return true; // Optional field accepted.
		}

		$response = wp_remote_get(
			'https://api.openai.com/v1/models',
			array(
				'timeout' => 5,
				'headers' => array(
					'Authorization' => 'Bearer ' . $api_key,
					'Content-Type'  => 'application/json',
				),
			)
		);

		if ( is_wp_error( $response ) ) {
			return false;
		}

		$body   = wp_remote_retrieve_body( $response );
		$data   = json_decode( $body, true );
		$models = array();

		if ( isset( $data['data'] ) && is_array( $data['data'] ) ) {
			foreach ( $data['data'] as $model ) {
				if ( isset( $model['id'] ) ) {
					$models[] = $model['id'];
				}
			}

			return true;
		}

		return false;
	}
}