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

namespace Hookbird;

defined( 'ABSPATH' ) || exit;

/**
 * Settings accessor.
 */
class Settings {

	const OPTION = 'hookbird_settings';

	/**
	 * Default settings.
	 *
	 * @return array
	 */
	public static function defaults() {
		return array(
			'max_attempts'      => 6,
			'timeout'           => 10,
			'batch_size'        => 25,
			'retention_days'    => 30,
			'circuit_threshold' => 20,
			'alert_email'       => '',
			'allow_local_urls'  => 0,
		);
	}

	/**
	 * All settings merged with defaults.
	 *
	 * @return array
	 */
	public static function all() {
		return wp_parse_args( (array) get_option( self::OPTION, array() ), self::defaults() );
	}

	/**
	 * Get one setting.
	 *
	 * @param string $key Setting key.
	 * @return mixed
	 */
	public static function get( $key ) {
		$settings = self::all();
		return isset( $settings[ $key ] ) ? $settings[ $key ] : null;
	}

	/**
	 * Email address for circuit breaker alerts.
	 *
	 * @return string
	 */
	public static function alert_email() {
		$email = (string) self::get( 'alert_email' );
		return is_email( $email ) ? $email : (string) get_option( 'admin_email' );
	}

	/**
	 * Whether URLs on localhost, private networks or custom ports are allowed.
	 *
	 * @return bool
	 */
	public static function allow_local_urls() {
		/**
		 * Filter whether endpoints may point at local or private network addresses.
		 *
		 * @param bool $allow Current setting.
		 */
		return (bool) apply_filters( 'hookbird_allow_local_urls', (bool) self::get( 'allow_local_urls' ) );
	}

	/**
	 * Sanitize settings on save.
	 *
	 * @param mixed $input Raw input.
	 * @return array
	 */
	public static function sanitize( $input ) {
		$input = is_array( $input ) ? $input : array();
		$out   = self::defaults();

		$ranges = array(
			'max_attempts'      => array( 1, 10 ),
			'timeout'           => array( 2, 30 ),
			'batch_size'        => array( 1, 100 ),
			'retention_days'    => array( 1, 365 ),
			'circuit_threshold' => array( 0, 1000 ),
		);
		foreach ( $ranges as $key => $range ) {
			if ( isset( $input[ $key ] ) && '' !== $input[ $key ] ) {
				$out[ $key ] = min( $range[1], max( $range[0], absint( $input[ $key ] ) ) );
			}
		}

		$email              = isset( $input['alert_email'] ) ? sanitize_email( (string) $input['alert_email'] ) : '';
		$out['alert_email'] = is_email( $email ) ? $email : '';

		$out['allow_local_urls'] = empty( $input['allow_local_urls'] ) ? 0 : 1;

		return $out;
	}

	/**
	 * Retry delays in seconds, indexed by attempts already made minus one.
	 *
	 * @return int[]
	 */
	public static function backoff_schedule() {
		/**
		 * Filter the retry schedule in seconds.
		 *
		 * @param int[] $schedule Delay after the 1st, 2nd, 3rd failed attempt and so on.
		 */
		$schedule = (array) apply_filters( 'hookbird_backoff_schedule', array( 30, 120, 600, 1800, 7200, 21600, 43200, 86400, 86400 ) );
		return array_values( array_map( 'absint', $schedule ) );
	}
}