<?php
/**
 * TablePress WP Option Wrapper class for WordPress Options
 *
 * Wraps the WordPress Options API, so that (especially) arrays are stored as JSON, instead of being serialized by PHP
 *
 * @package TablePress
 * @subpackage Classes
 * @author Tobias Bäthge
 * @since 1.0.0
 */

// Prohibit direct script loading
defined( 'ABSPATH' ) || die( 'No direct script access allowed!' );

/**
 * TablePress WP Option Wrapper class
 * @package TablePress
 * @subpackage Classes
 * @author Tobias Bäthge
 * @since 1.0.0
 */
class TablePress_WP_Option {

	/**
	 * Name/Key of the Option (in its location in the database)
	 *
	 * @since 1.0.0
	 *
	 * @var string
	 */
	protected $option_name;

	/**
	 * Current value of the option
	 *
	 * @since 1.0.0
	 *
	 * @var array
	 */
	protected $option_value;

	/**
	 * Initialize with Option Name
	 *
	 * @since 1.0.0
	 *
	 * @param array $params Name of the Option in string $params['option_name'],
	 *						Default values for the Option in array $params['default_value']
	 */
	public function __construct( $params ) {
		$this->option_name = $params['option_name'];

		$option_value = $this->_get_option( $this->option_name, null );
		if ( ! is_null( $option_value ) )
			$this->option_value = json_decode( $option_value, true ); // decode JSON as associative array
		else
			$this->option_value = $params['default_value'];
	}

	/**
	 * Check if Option is set
	 *
	 * @since 1.0.0
	 *
	 * @param string $name Name of the option to check
	 * @return bool Whether the option is set
	 */
	public function is_set( $name ) {
		return isset( $this->option_value[ $name ] );
	}

	/**
	 * Get a single Option, or get all Options
	 *
	 * @since 1.0.0
	 *
	 * @param string $name (optional) Name of a single option to get, or false for all options
	 * @param mixed $default_value (optional) Default value to return, if a single option $name does not exist
	 * @return mixed|array Value of the retrieved option $name or $default_value if it does not exist, or all options
	 */
	public function get( $name = false, $default_value = null ) {
		if ( false === $name )
			return $this->option_value;

		// Single Option wanted
		if ( isset( $this->option_value[ $name ] ) )
			return $this->option_value[ $name ];
		else
			return $default_value;
	}

	/**
	 * Update Option
	 *
	 * @since 1.0.0
	 *
	 * @param array $new_options New options ( name => value )
	 * @return bool True on success, false on failure
	 */
	public function update( $new_options ) {
		$this->option_value = $new_options;
		return $this->_update_option( $this->option_name, json_encode( $this->option_value ) );
	}

	/**
	 * Delete Option
	 *
	 * @since 1.0.0
	 *
	 * @return bool True on success, false on failure
	 */
	public function delete() {
		return $this->_delete_option( $this->option_name );
	}

	/**
	 * Internal functions mapping - This needs to be re-defined by child classes
	 */

	/**
	 * Get the value of a WP Option with the WP API
	 *
	 * @since 1.0.0
	 * @uses get_option()
	 *
	 * @param string $option_name Name of the WP Option
	 * @param mixed $default_value Default value of the WP Option
	 * @return mixed Current value of the WP Option, or $default_value if it does not exist
	 */
	protected function _get_option( $option_name, $default_value ) {
		return get_option( $option_name, $default_value );
	}

	/**
	 * Update the value of a WP Option with the WP API
	 *
	 * @since 1.0.0
	 * @uses update_option()
	 *
	 * @param string $option_name Name of the WP Option
	 * @param string $new_value New value of the WP Option
	 * @return bool True on success, false on failure
	 */
	protected function _update_option( $option_name, $new_value ) {
		return update_option( $option_name, $new_value );
	}

	/**
	 * Delete a WP Option with the WP API
	 *
	 * @since 1.0.0
	 * @uses delete_option()
	 *
	 * @param string $option_name Name of the WP Option
	 * @return bool True on success, false on failure
	 */
	protected function _delete_option( $option_name ) {
		return delete_option( $option_name );
	}

} // class TablePress_WP_Option