<?php
/**
 * Settings store.
 *
 * Core settings live in one option. Each module gets its own option, so that
 * uninstalling can remove a module's settings without touching anything else.
 *
 * @package PageCore
 */

namespace PageCore;

defined( 'ABSPATH' ) || exit;

/**
 * Namespaced read and write access to plugin options.
 */
class Settings {

	/**
	 * Option holding settings that belong to the plugin rather than a module.
	 */
	const CORE_OPTION = 'pagecore_settings';

	/**
	 * Read a core setting.
	 *
	 * @param string $key     Setting key, or null for the whole array.
	 * @param mixed  $default Value returned when the key is absent.
	 * @return mixed
	 */
	public function get( $key = null, $default = null ) {
		$settings = get_option( self::CORE_OPTION, array() );
		$settings = is_array( $settings ) ? $settings : array();

		if ( null === $key ) {
			return $settings;
		}

		return array_key_exists( $key, $settings ) ? $settings[ $key ] : $default;
	}

	/**
	 * Write a core setting.
	 *
	 * @param string $key   Setting key.
	 * @param mixed  $value Value to store.
	 * @return bool
	 */
	public function set( $key, $value ) {
		$settings         = $this->get();
		$settings[ $key ] = $value;

		return update_option( self::CORE_OPTION, $settings, true );
	}

	/**
	 * Option name holding one module's settings.
	 *
	 * @param string $module_id Module id.
	 * @return string
	 */
	public function module_option_name( $module_id ) {
		return 'pagecore_' . str_replace( '-', '_', $module_id ) . '_settings';
	}

	/**
	 * Read a module setting.
	 *
	 * @param string $module_id Module id.
	 * @param string $key       Setting key, or null for the whole array.
	 * @param mixed  $default   Value returned when the key is absent.
	 * @return mixed
	 */
	public function get_module( $module_id, $key = null, $default = null ) {
		$settings = get_option( $this->module_option_name( $module_id ), array() );
		$settings = is_array( $settings ) ? $settings : array();

		if ( null === $key ) {
			return $settings;
		}

		return array_key_exists( $key, $settings ) ? $settings[ $key ] : $default;
	}

	/**
	 * Write a module setting.
	 *
	 * @param string $module_id Module id.
	 * @param string $key       Setting key.
	 * @param mixed  $value     Value to store.
	 * @return bool
	 */
	public function set_module( $module_id, $key, $value ) {
		$settings         = $this->get_module( $module_id );
		$settings[ $key ] = $value;

		return update_option( $this->module_option_name( $module_id ), $settings, true );
	}

	/**
	 * Whether the site owner has asked for all data to go on uninstall.
	 *
	 * Defaults to false, so an accidental delete never takes content with it.
	 *
	 * @return bool
	 */
	public function should_remove_all_data() {
		return (bool) $this->get( 'remove_all_data', false );
	}
}