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<?php
/**
 * Revisions class with database interaction, data, and methods.
 *
 * @package CFF.
 * @since 1.0.232
 */

// phpcs:disable Squiz.Commenting.VariableComment.MissingVar

if ( ! class_exists( 'CPCFF_REVISIONS' ) ) {
	/**
	 * Handle the form revisions-history.
	 */
	class CPCFF_REVISIONS {

/**
		 * CPCFF_FORM instance
		 */
		private $_form_obj;

/**
		 * List of revisions rows corresponding to the form
		 */
		private $_revisions;

/**
		 * Instance of the $wpdb object
		 */
		private $_db;

/**
		 * Name of revisions table
		 */
		private $_table;

/**
		 * The number of revisions per form
		 */
		private $_max = 20;

/**
		 * Constructs a CPCFF_REVISIONS object.
		 *
		 * @param mixed $form_obj instance of CPCFF_FORM.
		 */
		public function __construct( $form_obj ) {
			global $wpdb;
			$this->_db       = $wpdb;
			$this->_table    = $wpdb->prefix . CP_CALCULATEDFIELDSF_FORMS_REVISIONS_TABLE;
			$this->_form_obj = $form_obj;
		} // End construct.

/**
		 * Returns the list of revisions rows in the database as array
		 */
		public function revisions_list() {
			if ( empty( $this->_revisions ) ) {
				$results              = $this->_db->get_results(
					$this->_db->prepare(
						'SELECT * FROM ' . $this->_table . ' WHERE formid=%d ORDER BY time DESC',
						$this->_form_obj->get_id()
					),
					ARRAY_A
				);
					$this->_revisions = array();
				foreach ( $results as $revision ) {
					$this->_revisions[ $revision['id'] ] = $revision;
				}
			}
			return $this->_revisions;
		} // End revisions_list.

/**
		 * Creates a new entry in the revisions table, if there are more than _max revisions remove the older.
		 *
		 * @return int returns the revision's id or false if fails.
		 */
		public function create_revision() {
			$form_data = $this->_form_obj->get_raw_data();

$data = array(
				'formid'   => $this->_form_obj->get_id(),
				'time'     => current_time( 'mysql' ),
				'revision' => serialize( $form_data ),
			);

if (
				$this->_db->insert(
					$this->_table,
					$data,
					array( '%d', '%s', '%s' )
				)
			) {
				$this->revisions_list();
				$data['id']                      = $this->_db->insert_id;
				$this->_revisions[ $data['id'] ] = $data;
				krsort( $this->_revisions );
				if ( $this->_max < count( $this->_revisions ) ) {
					array_splice( $this->_revisions, $this->_max );
					$this->_delete_older();
				}
				return $data['id'];
			}
			return false;
		} // End create_revision.

/**
		 * Returns the form data unserialized or an empty array
		 *
		 * @param integer $revision_id revision id.
		 */
		public function data( $revision_id ) {
			$this->revisions_list();
			if (
				! empty( $this->_revisions ) &&
				isset( $this->_revisions[ $revision_id ] )
			) {
				return unserialize( $this->_revisions[ $revision_id ]['revision'] );
			}
			return array();
		} // End data.

/**
		 * Deletes the list of revisions belonging to the form
		 */
		public function delete_form() {
			$this->_db->delete(
				$this->_table,
				array( 'formid' => $this->_form_obj->get_id() ),
				array( '%d' )
			);
			$this->_revisions = array();
		} // End delete_form.

/*********************************** PRIVATE METHODS  ********************************************/

/**
		 * Deletes the older revisions, leaving only the _max
		 */
		private function _delete_older() {
			$formid     = $this->_form_obj->get_id();
			$revisionid = $this->_db->get_var(
				$this->_db->prepare(
					'SELECT id FROM ' . $this->_table . ' WHERE formid=%d ORDER BY id DESC LIMIT %d,1',
					$formid,
					$this->_max
				)
			);

if ( ! empty( $revisionid ) ) {
				$this->_db->query(
					$this->_db->prepare(
						'DELETE FROM ' . $this->_table . ' WHERE formid=%d AND id < %d',
						$formid,
						$revisionid
					)
				);
			}
		} // End _delete_older.
	} // End CPCFF_REVISIONS.
}