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

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

/**
 * Form data model
 *
 * @package Airy_Frontend_Forms
 */
class AFFCF_Form_Model {

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

	/**
	 * Form name.
	 *
	 * @var string
	 */
	public $form_name;

	/**
	 * Form slug.
	 *
	 * @var string
	 */
	public $form_slug;

	/**
	 * Shortcode.
	 *
	 * @var string
	 */
	public $shortcode;

	/**
	 * Post type.
	 *
	 * @var string
	 */
	public $post_type;

	/**
	 * Form status.
	 *
	 * @var string
	 */
	public $status;

	/**
	 * Field groups configuration.
	 *
	 * @var string|array
	 */
	public $field_groups;

	/**
	 * Default WordPress fields configuration.
	 *
	 * @var string|array
	 */
	public $default_fields;

	/**
	 * Taxonomies configuration.
	 *
	 * @var string|array
	 */
	public $taxonomies;

	/**
	 * Form settings.
	 *
	 * @var string|array
	 */
	public $settings;

	/**
	 * User ID who created the form.
	 *
	 * @var int
	 */
	public $created_by;

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

	/**
	 * Updated timestamp.
	 *
	 * @var string
	 */
	public $updated_at;

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

		// Decode JSON fields.
		$this->decode_json_fields();
	}

	/**
	 * Decode JSON fields
	 */
	private function decode_json_fields() {
		$json_fields = array( 'field_groups', 'default_fields', 'taxonomies', 'settings' );

		foreach ( $json_fields as $field ) {
			if ( is_string( $this->$field ) && ! empty( $this->$field ) ) {
				// Decode JSON string.
				$decoded      = json_decode( $this->$field, true );
				$this->$field = $decoded ?? array();
			} elseif ( null === $this->$field || '' === $this->$field ) {
				// Initialize NULL or empty string to empty array.
				$this->$field = array();
			}
			// If already an array, leave it as is.
		}
	}

	/**
	 * Convert to array for database
	 *
	 * @return array Database-ready data.
	 */
	public function to_array() {
		$data = array(
			'form_name'  => $this->form_name,
			'form_slug'  => $this->form_slug,
			'shortcode'  => $this->shortcode,
			'post_type'  => $this->post_type,
			'status'     => $this->status,
			'created_by' => $this->created_by,
		);

		// Encode JSON fields.
		$json_fields = array( 'field_groups', 'default_fields', 'taxonomies', 'settings' );
		foreach ( $json_fields as $field ) {
			$data[ $field ] = is_array( $this->$field )
				? wp_json_encode( $this->$field )
				: $this->$field;
		}

		return $data;
	}

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

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

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

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

		if ( ! in_array( $this->status, array( 'active', 'inactive' ), true ) ) {
			$this->status = 'active';
		}

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

	/**
	 * Get enabled field groups
	 *
	 * @return array Enabled field groups.
	 */
	public function get_enabled_field_groups() {
		if ( empty( $this->field_groups ) ) {
			return array();
		}

		return array_filter(
			$this->field_groups,
			function ( $group ) {
				return ! empty( $group['enabled'] );
			}
		);
	}

	/**
	 * Get enabled default fields
	 *
	 * @return array Enabled default fields.
	 */
	public function get_enabled_default_fields() {
		if ( empty( $this->default_fields ) ) {
			return array();
		}

		return array_filter(
			$this->default_fields,
			function ( $field ) {
				return ! empty( $field['enabled'] );
			}
		);
	}

	/**
	 * Get enabled taxonomies
	 *
	 * @return array Enabled taxonomies.
	 */
	public function get_enabled_taxonomies() {
		if ( empty( $this->taxonomies ) ) {
			return array();
		}

		return array_filter(
			$this->taxonomies,
			function ( $tax ) {
				return ! empty( $tax['enabled'] );
			}
		);
	}

	/**
	 * Check if form is active
	 *
	 * @return bool.
	 */
	public function is_active() {
		return 'active' === $this->status;
	}
}