<?php
/**
 * Plugin settings.
 *
 * @package SpaceBay
 */

namespace SpaceBay\Core;

use SpaceBay\Support\Slug;

defined( 'ABSPATH' ) || exit;

/**
 * Reads, validates and stores the SpaceBay settings option.
 */
final class Settings {

	/**
	 * Option name in wp_options.
	 *
	 * @var string
	 */
	const OPTION = 'spacebay_settings';

	/**
	 * Request-level cache of the stored settings.
	 *
	 * @var array|null
	 */
	private static $cache = null;

	/**
	 * Returns the schema of every setting: type, default and allowed values.
	 *
	 * @return array<string, array>
	 */
	public static function schema() {
		$schema = array(
			'community_name'           => array(
				'type'    => 'string',
				'default' => get_bloginfo( 'name' ),
			),
			'portal_slug'              => array(
				'type'    => 'slug',
				'default' => 'community',
			),
			'portal_layout'            => array(
				'type'    => 'enum',
				'default' => 'standalone',
				'options' => array( 'standalone', 'theme' ),
			),
			'color_mode'               => array(
				'type'    => 'enum',
				'default' => 'system',
				'options' => array( 'system', 'light', 'dark' ),
			),
			'brand_color'              => array(
				'type'    => 'color',
				'default' => '#3f22ff',
			),
			'space_icon_color'         => array(
				'type'    => 'enum',
				'default' => 'brand',
				'options' => array( 'brand', 'space' ),
			),
			'access'                   => array(
				'type'    => 'enum',
				'default' => 'public',
				'options' => array( 'public', 'members' ),
			),
			'member_directory'         => array(
				'type'    => 'enum',
				'default' => 'members',
				'options' => array( 'members', 'off' ),
			),
			'link_previews'            => array(
				'type'    => 'bool',
				'default' => true,
			),
			'max_upload_mb'            => array(
				'type'    => 'int',
				'default' => 5,
				'min'     => 1,
				'max'     => 50,
			),
			'emails_enabled'           => array(
				'type'    => 'bool',
				'default' => true,
			),
			'email_from_name'          => array(
				'type'    => 'string',
				'default' => '',
			),
			'email_from_address'       => array(
				'type'    => 'email',
				'default' => '',
			),
			'member_approval'          => array(
				'type'    => 'bool',
				'default' => false,
			),
			'post_review'              => array(
				'type'    => 'enum',
				'default' => 'off',
				'options' => array( 'off', 'first', 'all' ),
			),
			'blocked_words'            => array(
				'type'    => 'textarea',
				'default' => '',
			),
			'blocked_words_action'     => array(
				'type'    => 'enum',
				'default' => 'review',
				'options' => array( 'review', 'mask', 'block' ),
			),
			'report_threshold'         => array(
				'type'    => 'int',
				'default' => 3,
				'min'     => 0,
				'max'     => 20,
			),
			'messages_enabled'         => array(
				'type'    => 'bool',
				'default' => true,
			),
			'messages_who'             => array(
				'type'    => 'enum',
				'default' => 'shared',
				'options' => array( 'everyone', 'shared', 'staff' ),
			),
			'group_chats'              => array(
				'type'    => 'bool',
				'default' => true,
			),
			'group_chat_max'           => array(
				'type'    => 'int',
				'default' => 20,
				'min'     => 3,
				'max'     => 100,
			),
			'auth_pages'               => array(
				'type'    => 'bool',
				'default' => true,
			),
			'signup_enabled'           => array(
				'type'    => 'bool',
				'default' => (bool) get_option( 'users_can_register' ),
			),
			'signup_terms_url'         => array(
				'type'    => 'url',
				'default' => '',
			),
			'social_google'            => array(
				'type'    => 'bool',
				'default' => false,
			),
			'social_google_id'         => array(
				'type'    => 'string',
				'default' => '',
			),
			'social_google_secret'     => array(
				'type'    => 'string',
				'default' => '',
			),
			'social_facebook'          => array(
				'type'    => 'bool',
				'default' => false,
			),
			'social_facebook_id'       => array(
				'type'    => 'string',
				'default' => '',
			),
			'social_facebook_secret'   => array(
				'type'    => 'string',
				'default' => '',
			),
			'gamification'             => array(
				'type'    => 'bool',
				'default' => true,
			),
			'leaderboard'              => array(
				'type'    => 'bool',
				'default' => true,
			),
			'points_post'              => array(
				'type'    => 'int',
				'default' => 5,
				'min'     => 0,
				'max'     => 100,
			),
			'points_comment'           => array(
				'type'    => 'int',
				'default' => 2,
				'min'     => 0,
				'max'     => 100,
			),
			'points_like'              => array(
				'type'    => 'int',
				'default' => 1,
				'min'     => 0,
				'max'     => 100,
			),
			'points_daily'             => array(
				'type'    => 'int',
				'default' => 1,
				'min'     => 0,
				'max'     => 100,
			),
			'points_event'             => array(
				'type'    => 'int',
				'default' => 2,
				'min'     => 0,
				'max'     => 100,
			),
			'levels'                   => array(
				'type'    => 'levels',
				'default' => \SpaceBay\Gamification\Levels::defaults(),
			),
			'badges'                   => array(
				'type'    => 'badges',
				'default' => \SpaceBay\Gamification\Badges::defaults(),
			),
			'events_enabled'           => array(
				'type'    => 'bool',
				'default' => true,
			),
			'events_who'               => array(
				'type'    => 'enum',
				'default' => 'admins',
				'options' => array( 'admins', 'members' ),
			),
			'logo_id'                  => array(
				'type'    => 'image',
				'default' => 0,
			),
			'show_community_name'      => array(
				'type'    => 'bool',
				'default' => true,
			),
			'welcome_title'            => array(
				'type'    => 'string',
				'default' => __( 'Welcome to our community', 'spacebay' ),
			),
			'welcome_message'          => array(
				'type'    => 'textarea',
				'default' => __( 'Say hello, ask questions and share what you are working on.', 'spacebay' ),
			),
			'delete_data_on_uninstall' => array(
				'type'    => 'bool',
				'default' => false,
			),
		);

		/**
		 * Filters the settings schema so extensions can add their own settings.
		 *
		 * @since 1.0.0
		 *
		 * @param array $schema Settings schema keyed by setting name.
		 */
		return apply_filters( 'spacebay_settings_schema', $schema );
	}

	/**
	 * Returns default values for every setting.
	 *
	 * @return array
	 */
	public static function defaults() {
		return wp_list_pluck( self::schema(), 'default' );
	}

	/**
	 * Returns every setting merged with defaults.
	 *
	 * @return array
	 */
	public static function all() {
		if ( null === self::$cache ) {
			$stored      = get_option( self::OPTION, array() );
			self::$cache = wp_parse_args( is_array( $stored ) ? $stored : array(), self::defaults() );
		}

		return self::$cache;
	}

	/**
	 * Returns one setting.
	 *
	 * @param string $key      Setting name.
	 * @param mixed  $fallback Value returned when the setting does not exist.
	 * @return mixed
	 */
	public static function get( $key, $fallback = null ) {
		$all = self::all();

		return array_key_exists( $key, $all ) ? $all[ $key ] : $fallback;
	}

	/**
	 * Validates and saves a partial set of settings.
	 *
	 * Unknown keys are ignored. Invalid values keep their previous value.
	 *
	 * @param array $input Raw values keyed by setting name.
	 * @return array The saved settings.
	 */
	public static function update( array $input ) {
		$current = self::all();
		$schema  = self::schema();
		$old     = $current;

		foreach ( $input as $key => $value ) {
			if ( ! isset( $schema[ $key ] ) ) {
				continue;
			}

			$clean = self::sanitize( $value, $schema[ $key ] );

			if ( null !== $clean ) {
				$current[ $key ] = $clean;
			}
		}

		update_option( self::OPTION, $current );
		self::$cache = null;

		if ( $old['portal_slug'] !== $current['portal_slug'] ) {
			update_option( 'spacebay_flush_rewrite', 1 );
		}

		/**
		 * Fires after SpaceBay settings are saved.
		 *
		 * @since 1.0.0
		 *
		 * @param array $current New settings.
		 * @param array $old     Previous settings.
		 */
		do_action( 'spacebay_settings_updated', $current, $old );

		return self::all();
	}

	/**
	 * Sanitizes one value according to its schema entry.
	 *
	 * @param mixed $value  Raw value.
	 * @param array $field  Schema entry.
	 * @return mixed|null Clean value, or null when the value is not valid.
	 */
	private static function sanitize( $value, array $field ) {
		// Settings added through the spacebay_settings_schema filter can bring their own cleaning.
		if ( isset( $field['sanitize'] ) && is_callable( $field['sanitize'] ) ) {
			return call_user_func( $field['sanitize'], $value );
		}

		switch ( $field['type'] ) {
			case 'bool':
				return rest_sanitize_boolean( $value );

			case 'int':
				$value = (int) $value;
				return max( (int) $field['min'], min( (int) $field['max'], $value ) );

			case 'enum':
				$value = sanitize_key( (string) $value );
				return in_array( $value, $field['options'], true ) ? $value : null;

			case 'slug':
				$value = Slug::make( (string) $value );
				return '' !== $value ? $value : null;

			case 'color':
				$value = sanitize_hex_color( (string) $value );
				return $value ? strtolower( $value ) : null;

			case 'email':
				$value = sanitize_email( (string) $value );
				return '' === $value || is_email( $value ) ? $value : null;

			case 'textarea':
				return sanitize_textarea_field( (string) $value );

			case 'url':
				return esc_url_raw( trim( (string) $value ), array( 'http', 'https' ) );

			case 'levels':
				return is_array( $value ) ? \SpaceBay\Gamification\Levels::sanitize( $value ) : null;

			case 'badges':
				return is_array( $value ) ? \SpaceBay\Gamification\Badges::sanitize( $value ) : null;

			case 'image':
				$value = absint( $value );
				return 0 === $value || wp_attachment_is_image( $value ) ? $value : null;

			case 'string':
			default:
				return sanitize_text_field( (string) $value );
		}
	}

	/**
	 * Clears the request cache. Used by tests and after switching sites.
	 *
	 * @return void
	 */
	public static function flush_cache() {
		self::$cache = null;
	}
}