<?php

/**
 * Options management class.
 *
 * @author     Time.ly Network, Inc.
 * @since      2.0
 * @package    Ai1EC
 * @subpackage Ai1EC.Model
 */
class Ai1ec_Option extends Ai1ec_App {

    /**
     * @var Ai1ec_Cache_Memory In-memory cache storage engine for fast access.
     */
    protected $_cache = null;

    /**
     * @var Ai1ec_Registry_Object instance of the registry object.
     */
    protected $_registry;

    /**
     * Add cache instance to object scope.
     *
     * @param Ai1ec_Registry_Object $registry Registry object.
     *
     * @return Ai1ec_Option
     */
    public function __construct( Ai1ec_Registry_Object $registry ) {
        $this->_registry = $registry;
        $this->_cache    = $registry->get( 'cache.memory' );
    }

    /**
     * Create an option if it does not exist.
     *
     * @param string $name     Key to put value under.
     * @param mixed  $value    Value to put to storage.
     * @param bool   $autoload Set to true to load on start.
     *
     * @return bool Success.
     */
    public function add( $name, $value, $autoload = false ) {
        $autoload = $this->_parse_autoload( $autoload );
        if ( ! add_option( $name, $value, '', $autoload ) ) {
            return false;
        }
        $this->_cache->set( $name, $value );
        return true;
    }

    /**
     * Create an option if it does not exist, or update existing.
     *
     * @param string $name     Key to put value under.
     * @param mixed  $value    Value to put to storage.
     * @param bool   $autoload Set to true to load on start.
     *
     * @return bool Success.
     */
    public function set( $name, $value, $autoload = false ) {
        $comparator = "\0t\0";
        if ( $this->get( $name, $comparator ) === $comparator ) {
            return $this->add( $name, $value, $autoload );
        }
        if ( ! update_option( $name, $value ) ) {
            return false;
        }
        $this->_cache->set( $name, $value );
        return true;
    }

    /**
     * Get a value from storage.
     *
     * @param string $name    Key to retrieve.
     * @param mixed  $default Value to return if key was not set previously.
     *
     * @return mixed Value from storage or {$default}.
     */
    public function get( $name, $default = null ) {
        $value = $this->_cache->get( $name, $default );
        if ( $default === $value ) {
            $value = get_option( $name, $default );
            $this->_cache->set( $name, $value );
        }
        return $value;
    }

    /**
     * Delete value from storage.
     *
     * @param string $name Key to delete.
     *
     * @wp_hook deleted_option Fire after deletion.
     *
     * @return bool Success.
     */
    public function delete( $name ) {
        $this->_cache->delete( $name );
        if ( 'deleted_option' === current_filter() ) {
            return true; // avoid loops
        }
        return delete_option( $name );
    }


    /**
     * Convert autoload flag input to value recognized by WordPress.
     *
     * @param bool $input Autoload flag value.
     *
     * @return string Autoload identifier.
     */
    protected function _parse_autoload( $input ) {
        return $input ? 'yes' : 'no';
    }

}