<?php
/**
 * Settings access and URL helpers shared by every part of the plugin.
 *
 * @package Medivot
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Core helpers.
 */
final class Medivot_Plugin {

	/**
	 * Option holding the plugin settings (API key, widget key, chat toggle, booking handle).
	 */
	const OPTION = 'medivot_settings';

	/**
	 * Option holding the result of the last API connection check.
	 */
	const CONNECTION_OPTION = 'medivot_connection';

	/**
	 * Transient caching the event types list shown in the block editor.
	 */
	const EVENT_TYPES_TRANSIENT = 'medivot_event_types';

	/**
	 * Where Medivot lives. Override with the MEDIVOT_APP_URL constant or the
	 * medivot_app_url filter (for a staging copy of Medivot, for example).
	 */
	const DEFAULT_APP_URL = 'https://medivot.com';

	/**
	 * Wire up every component.
	 */
	public static function boot() {
		Medivot_Admin::register();
		Medivot_Chat_Widget::register();
		Medivot_Embeds::register();
	}

	/**
	 * Default settings.
	 *
	 * @return array
	 */
	public static function defaults() {
		return array(
			'api_key'      => '',
			'widget_key'   => '',
			'chat_enabled' => false,
			'booking_slug' => '',
		);
	}

	/**
	 * Saved settings merged over the defaults (never missing a key).
	 *
	 * @return array
	 */
	public static function settings() {
		$saved = get_option( self::OPTION, array() );
		if ( ! is_array( $saved ) ) {
			$saved = array();
		}

		return array_merge( self::defaults(), array_intersect_key( $saved, self::defaults() ) );
	}

	/**
	 * One setting.
	 *
	 * @param string $key Setting name.
	 * @return mixed
	 */
	public static function get( $key ) {
		$settings = self::settings();

		return isset( $settings[ $key ] ) ? $settings[ $key ] : null;
	}

	/**
	 * Result of the last connection check, or an empty array.
	 *
	 * @return array
	 */
	public static function connection() {
		$connection = get_option( self::CONNECTION_OPTION, array() );

		return is_array( $connection ) ? $connection : array();
	}

	/**
	 * Base URL of the Medivot app, without a trailing slash.
	 *
	 * @return string
	 */
	public static function app_url() {
		$url = defined( 'MEDIVOT_APP_URL' ) ? (string) MEDIVOT_APP_URL : self::DEFAULT_APP_URL;

		/**
		 * Filters the base URL of the Medivot app the plugin talks to.
		 *
		 * @param string $url Base URL, for example https://medivot.com.
		 */
		$url = untrailingslashit( esc_url_raw( (string) apply_filters( 'medivot_app_url', $url ) ) );

		return '' !== $url ? $url : self::DEFAULT_APP_URL;
	}

	/**
	 * The workspace handle used in booking links (/book/{handle}). The saved
	 * setting wins; otherwise the handle detected by the API connection check.
	 *
	 * @return string
	 */
	public static function booking_handle() {
		$handle = (string) self::get( 'booking_slug' );
		if ( '' !== $handle ) {
			return $handle;
		}

		$connection = self::connection();
		if ( ! empty( $connection['ok'] ) && ! empty( $connection['slug'] ) ) {
			return self::clean_slug( $connection['slug'] );
		}

		return '';
	}

	/**
	 * Keep only the characters Medivot uses in slugs and IDs.
	 *
	 * @param mixed $value Raw value.
	 * @return string
	 */
	public static function clean_slug( $value ) {
		if ( ! is_scalar( $value ) ) {
			return '';
		}

		return substr( (string) preg_replace( '/[^A-Za-z0-9_-]/', '', (string) $value ), 0, 191 );
	}

	/**
	 * Read slugs from a bare value or a pasted Medivot link.
	 *
	 * "acme/intro-call" and "https://medivot.com/book/acme/intro-call" with the
	 * marker "book" both give array( 'acme', 'intro-call' ).
	 *
	 * @param mixed  $value  Bare slug, slug path or full link.
	 * @param string $marker Path segment that precedes the slugs in a full link.
	 * @return string[]
	 */
	public static function slugs_from( $value, $marker ) {
		if ( ! is_scalar( $value ) ) {
			return array();
		}

		$value = trim( (string) $value );
		if ( '' === $value ) {
			return array();
		}

		$path  = (string) wp_parse_url( $value, PHP_URL_PATH );
		$parts = array_values( array_filter( explode( '/', $path ), 'strlen' ) );

		$at = array_search( $marker, $parts, true );
		if ( false !== $at ) {
			$parts = array_slice( $parts, $at + 1 );
		}

		return array_values( array_filter( array_map( array( __CLASS__, 'clean_slug' ), $parts ), 'strlen' ) );
	}
}