<?php
/**
 * AJAX request handlers.
 *
 * @package AIIL
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * AJAX handler class.
 */
class AIIL_Ajax {

	/**
	 * Initialize AJAX handlers.
	 */
	public static function init() {
		add_action( 'wp_ajax_aiil_generate_links', array( __CLASS__, 'generate_links' ) );
		add_action( 'wp_ajax_aiil_test_credentials', array( __CLASS__, 'test_credentials' ) );
	}

	/**
	 * Generate internal links via AJAX.
	 */
	public static function generate_links() {
		// Verify nonce.
		check_ajax_referer( 'aiil_generate_links', 'nonce' );

		// Check permissions.
		if ( ! current_user_can( 'edit_posts' ) ) {
			wp_send_json_error( array(
				'message' => __( 'You do not have permission to perform this action.', 'ai-internal-links' ),
			) );
		}

		// Get and validate input.
		$content = isset( $_POST['content'] ) ? wp_kses_post( wp_unslash( $_POST['content'] ) ) : '';
		$post_id = isset( $_POST['post_id'] ) ? intval( $_POST['post_id'] ) : 0;

		if ( empty( $content ) ) {
			wp_send_json_error( array(
				'message' => __( 'Content is required.', 'ai-internal-links' ),
			) );
		}

		// Get link generator instance.
		$generator = new AIIL_Link_Generator();

		// Generate suggestions.
		$result = $generator->generate( $content, $post_id );

		if ( is_wp_error( $result ) ) {
			wp_send_json_error( array(
				'message' => $result->get_error_message(),
			) );
		}

		wp_send_json_success( array(
			'suggestions' => $result,
			'count'       => count( $result ),
		) );
	}

	/**
	 * Test API credentials.
	 */
	public static function test_credentials() {
		check_ajax_referer( 'aiil_settings', 'nonce' );

		if ( ! current_user_can( 'manage_options' ) ) {
			wp_send_json_error( array(
				'message' => __( 'You do not have permission to perform this action.', 'ai-internal-links' ),
			) );
		}

		$provider_name = isset( $_POST['provider'] ) ? sanitize_text_field( wp_unslash( $_POST['provider'] ) ) : '';
		$credentials   = isset( $_POST['credentials'] ) ? array_map( 'sanitize_text_field', wp_unslash( $_POST['credentials'] ) ) : array();

		if ( empty( $provider_name ) ) {
			wp_send_json_error( array(
				'message' => __( 'Provider is required.', 'ai-internal-links' ),
			) );
		}

		$provider = AIIL_LLM_Factory::get_provider( $provider_name );

		if ( is_wp_error( $provider ) ) {
			wp_send_json_error( array(
				'message' => $provider->get_error_message(),
			) );
		}

		$result = $provider->validate_credentials( $credentials );

		if ( is_wp_error( $result ) ) {
			wp_send_json_error( array(
				'message' => $result->get_error_message(),
			) );
		}

		wp_send_json_success( array(
			'message' => __( 'Credentials validated successfully!', 'ai-internal-links' ),
		) );
	}
}