<?php
/**
 * Authenticated Ajax endpoints.
 *
 * @package FlipWebP
 */

namespace FlipWebP;

defined( 'ABSPATH' ) || exit;

/**
 * Ajax handlers for conversion, restore, and the image list.
 */
class Ajax {

	/**
	 * Register logged-in handlers. There are no public handlers.
	 *
	 * @return void
	 */
	public function register() {
		add_action( 'wp_ajax_flipwebp_convert', array( $this, 'convert' ) );
		add_action( 'wp_ajax_flipwebp_restore', array( $this, 'restore' ) );
		add_action( 'wp_ajax_flipwebp_list', array( $this, 'list_items' ) );
		add_action( 'wp_ajax_flipwebp_pending_ids', array( $this, 'pending_ids' ) );
	}

	/**
	 * Convert one attachment.
	 *
	 * @return void
	 */
	public function convert() {
		$this->guard();
		$id = isset( $_POST['attachment_id'] ) ? absint( wp_unslash( $_POST['attachment_id'] ) ) : 0;
		$this->assert_attachment( $id );

		$result = ( new Converter() )->convert( $id );
		$this->send_result( $id, $result );
	}

	/**
	 * Restore one attachment.
	 *
	 * @return void
	 */
	public function restore() {
		$this->guard();
		$id = isset( $_POST['attachment_id'] ) ? absint( wp_unslash( $_POST['attachment_id'] ) ) : 0;
		$this->assert_attachment( $id );

		$result = ( new Converter() )->restore( $id );
		$this->send_result( $id, $result );
	}

	/**
	 * Return the library markup and fresh statistics.
	 *
	 * @return void
	 */
	public function list_items() {
		$this->guard();

		$status = isset( $_POST['status'] ) ? sanitize_key( wp_unslash( $_POST['status'] ) ) : 'all';
		$search = isset( $_POST['s'] ) ? sanitize_text_field( wp_unslash( $_POST['s'] ) ) : '';
		$paged  = isset( $_POST['paged'] ) ? absint( wp_unslash( $_POST['paged'] ) ) : 1;
		$list   = Library::query( Library::sanitize_filters( $status, $search, $paged ) );

		wp_send_json_success(
			array(
				'html'  => Admin::library_html( $list ),
				'stats' => Stats::get(),
			)
		);
	}

	/**
	 * Return the next pending IDs after a cursor.
	 *
	 * @return void
	 */
	public function pending_ids() {
		$this->guard();

		$after = isset( $_POST['after_id'] ) ? absint( wp_unslash( $_POST['after_id'] ) ) : 0;
		$ids   = Library::pending_ids( $after, 30 );

		wp_send_json_success(
			array(
				'ids' => $ids,
			)
		);
	}

	/**
	 * Require a valid nonce and the media capability.
	 *
	 * @return void
	 */
	private function guard() {
		$nonce = isset( $_POST['nonce'] ) ? sanitize_text_field( wp_unslash( $_POST['nonce'] ) ) : '';
		if ( ! wp_verify_nonce( $nonce, 'flipwebp_admin' ) ) {
			wp_send_json_error(
				array(
					'message' => __( 'The link you followed has expired. Reload the page and try again.', 'flipwebp' ),
				),
				403
			);
		}

		if ( ! current_user_can( 'upload_files' ) ) {
			wp_send_json_error(
				array(
					'message' => __( 'You do not have permission to convert images.', 'flipwebp' ),
				),
				403
			);
		}
	}

	/**
	 * Stop the request when the attachment cannot be edited.
	 *
	 * @param int $attachment_id Attachment ID.
	 * @return void
	 */
	private function assert_attachment( $attachment_id ) {
		if ( ! Capabilities::can_convert( $attachment_id ) ) {
			wp_send_json_error(
				array(
					'message' => __( 'You do not have permission to convert this image.', 'flipwebp' ),
				),
				403
			);
		}
	}

	/**
	 * Send a conversion result and the refreshed row.
	 *
	 * @param int                          $attachment_id Attachment ID.
	 * @param array<string, mixed>|\WP_Error $result      Result.
	 * @return void
	 */
	private function send_result( $attachment_id, $result ) {
		if ( is_wp_error( $result ) ) {
			wp_send_json_error(
				array(
					'message' => wp_strip_all_tags( $result->get_error_message() ),
					'status'  => 'error',
				)
			);
		}

		$item = Library::item( $attachment_id );
		wp_send_json_success(
			array(
				'result' => array(
					'status'  => isset( $result['status'] ) ? sanitize_key( (string) $result['status'] ) : '',
					'message' => isset( $result['message'] ) ? wp_strip_all_tags( (string) $result['message'] ) : '',
				),
				'item'   => $this->public_item( $item ),
				'stats'  => Stats::get(),
			)
		);
	}

	/**
	 * Remove anything the browser does not need from a library row.
	 *
	 * @param array<string, mixed>|null $item Row.
	 * @return array<string, mixed>|null
	 */
	private function public_item( $item ) {
		if ( ! is_array( $item ) ) {
			return null;
		}

		$thumb = isset( $item['thumb'] ) ? (string) $item['thumb'] : '';
		$thumb = wp_http_validate_url( $thumb ) ? $thumb : '';

		return array(
			'id'          => isset( $item['id'] ) ? (int) $item['id'] : 0,
			'filename'    => isset( $item['filename'] ) ? (string) $item['filename'] : '',
			'mimeLabel'   => isset( $item['mimeLabel'] ) ? (string) $item['mimeLabel'] : '',
			'dimensions'  => isset( $item['dimensions'] ) ? (string) $item['dimensions'] : '',
			'sizeLabel'   => isset( $item['sizeLabel'] ) ? (string) $item['sizeLabel'] : '',
			'savedLabel'  => isset( $item['savedLabel'] ) ? (string) $item['savedLabel'] : '',
			'status'      => isset( $item['status'] ) ? sanitize_key( (string) $item['status'] ) : '',
			'statusLabel' => isset( $item['statusLabel'] ) ? (string) $item['statusLabel'] : '',
			'actionLabel' => isset( $item['actionLabel'] ) ? (string) $item['actionLabel'] : '',
			'restoreUrl'  => ( isset( $item['restoreUrl'] ) && is_string( $item['restoreUrl'] ) ) ? $item['restoreUrl'] : '',
			'thumb'       => $thumb,
		);
	}
}