<?php
/**
 * Draft Data Model
 *
 * @package Airy_Frontend_Forms
 */

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

/**
 * Draft data model
 *
 * @package Airy_Frontend_Forms
 */
class AFFCF_Draft_Model {

	/**
	 * Draft ID.
	 *
	 * @var int
	 */
	public $id;

	/**
	 * User ID who created the draft.
	 *
	 * @var int
	 */
	public $user_id;

	/**
	 * Form ID.
	 *
	 * @var int
	 */
	public $form_id;

	/**
	 * Post ID (null for new posts).
	 *
	 * @var int|null
	 */
	public $post_id;

	/**
	 * Draft data (JSON or array).
	 *
	 * @var string|array
	 */
	public $draft_data;

	/**
	 * Files data (JSON or array).
	 *
	 * @var string|array
	 */
	public $files_data;

	/**
	 * Last saved timestamp.
	 *
	 * @var string
	 */
	public $last_saved;

	/**
	 * Created timestamp.
	 *
	 * @var string
	 */
	public $created_at;

	/**
	 * Constructor
	 *
	 * @param array $data Draft data.
	 */
	public function __construct( $data = array() ) {
		foreach ( $data as $key => $value ) {
			if ( property_exists( $this, $key ) ) {
				$this->$key = $value;
			}
		}

		// Decode JSON fields.
		if ( is_string( $this->draft_data ) ) {
			$this->draft_data = json_decode( $this->draft_data, true );
		}

		if ( is_string( $this->files_data ) ) {
			$this->files_data = json_decode( $this->files_data, true );
		}
	}

	/**
	 * Convert to array for database
	 *
	 * @return array Database-ready data.
	 */
	public function to_array() {
		return array(
			'user_id'    => $this->user_id,
			'form_id'    => $this->form_id,
			'post_id'    => $this->post_id,
			'draft_data' => is_array( $this->draft_data ) ? wp_json_encode( $this->draft_data ) : $this->draft_data,
			'files_data' => is_array( $this->files_data ) ? wp_json_encode( $this->files_data ) : $this->files_data,
		);
	}

	/**
	 * Validate model data
	 *
	 * @return bool|array True if valid, array of errors otherwise.
	 */
	public function validate() {
		$errors = array();

		if ( empty( $this->user_id ) ) {
			$errors[] = __( 'User ID is required.', 'airy-frontend-forms' );
		}

		if ( empty( $this->form_id ) ) {
			$errors[] = __( 'Form ID is required.', 'airy-frontend-forms' );
		}

		if ( empty( $this->draft_data ) ) {
			$errors[] = __( 'Draft data is required.', 'airy-frontend-forms' );
		}

		return empty( $errors ) ? true : $errors;
	}
}