<?php
/**
 * Settings of the maintenance and coming-soon page.
 *
 * @package ForensixDigital
 */

declare(strict_types=1);

namespace ForensixDigital\Apps\Maintenance;

defined( 'ABSPATH' ) || exit;

/**
 * What visitors see while the site is closed. The mode is off until the owner switches it on.
 */
final class MaintenanceConfig {

	public const SCOPE = 'maintenance';

	public const MODE_MAINTENANCE = 'maintenance';
	public const MODE_COMING_SOON = 'coming_soon';

	public const IMAGE_NONE       = 'none';
	public const IMAGE_BACKGROUND = 'background';
	public const IMAGE_SIDE       = 'side';

	/**
	 * Colours of the built-in page.
	 *
	 * @var array<string, string>
	 */
	public const COLOURS = array(
		'color_background' => '#f4f6f9',
		'color_box'        => '#ffffff',
		'color_text'       => '#1d2733',
		'color_accent'     => '#2271b1',
	);

	/**
	 * Defaults.
	 *
	 * @return array<string, mixed>
	 */
	public static function defaults(): array {
		return array(
			'enabled'       => false,
			'mode'          => self::MODE_MAINTENANCE,
			'title'         => '',
			'message'       => '',
			'allowed_ips'   => array(),
			'page_id'       => 0,
			'logo_id'       => 0,
			'image_id'      => 0,
			'image_style'   => self::IMAGE_NONE,
			'legal_public'  => true,
			'allowed_pages' => array(),
		) + self::COLOURS;
	}

	/**
	 * Cleans values before they are saved.
	 *
	 * @param array<string, mixed> $values Values.
	 * @return array<string, mixed>
	 */
	public static function sanitize( array $values ): array {
		$values = array_merge( self::defaults(), $values );
		$ips    = is_array( $values['allowed_ips'] ) ? $values['allowed_ips'] : preg_split( '/\R/', (string) $values['allowed_ips'] );
		$clean  = array();
		foreach ( (array) $ips as $ip ) {
			$ip = trim( (string) $ip );
			if ( false !== filter_var( $ip, FILTER_VALIDATE_IP ) ) {
				$clean[] = $ip;
			}
		}
		$pages = array();
		foreach ( (array) $values['allowed_pages'] as $page ) {
			$page = self::id( $page );
			if ( $page > 0 ) {
				$pages[] = $page;
			}
		}
		$style  = in_array( $values['image_style'], array( self::IMAGE_BACKGROUND, self::IMAGE_SIDE ), true ) ? $values['image_style'] : self::IMAGE_NONE;
		$result = array(
			'enabled'       => (bool) $values['enabled'],
			'mode'          => self::MODE_COMING_SOON === $values['mode'] ? self::MODE_COMING_SOON : self::MODE_MAINTENANCE,
			'title'         => substr( sanitize_text_field( (string) $values['title'] ), 0, 120 ),
			'message'       => substr( sanitize_textarea_field( (string) $values['message'] ), 0, 1000 ),
			'allowed_ips'   => array_slice( array_values( array_unique( $clean ) ), 0, 20 ),
			'page_id'       => self::id( $values['page_id'] ),
			'logo_id'       => self::id( $values['logo_id'] ),
			'image_id'      => self::id( $values['image_id'] ),
			'image_style'   => $style,
			'legal_public'  => (bool) $values['legal_public'],
			'allowed_pages' => array_slice( array_values( array_unique( $pages ) ), 0, 50 ),
		);
		foreach ( self::COLOURS as $key => $fallback ) {
			$colour         = strtolower( trim( (string) $values[ $key ] ) );
			$result[ $key ] = 1 === preg_match( '/^#[0-9a-f]{6}$/', $colour ) ? $colour : $fallback;
		}
		return $result;
	}

	/**
	 * A positive post id, or 0.
	 *
	 * @param mixed $value Raw value.
	 */
	private static function id( $value ): int {
		return is_numeric( $value ) ? max( 0, (int) $value ) : 0;
	}

	/**
	 * Title shown to visitors, with a plain default.
	 *
	 * @param array<string, mixed> $values Saved values.
	 */
	public static function title( array $values ): string {
		if ( '' !== (string) $values['title'] ) {
			return (string) $values['title'];
		}
		return self::MODE_COMING_SOON === $values['mode'] ? __( 'Coming soon', 'forensix-digital' ) : __( 'We will be right back', 'forensix-digital' );
	}

	/**
	 * Message shown to visitors, with a plain default.
	 *
	 * @param array<string, mixed> $values Saved values.
	 */
	public static function message( array $values ): string {
		if ( '' !== (string) $values['message'] ) {
			return (string) $values['message'];
		}
		return self::MODE_COMING_SOON === $values['mode']
			? __( 'This website is being built. Please come back soon.', 'forensix-digital' )
			: __( 'The website is being updated. Please try again in a few minutes.', 'forensix-digital' );
	}
}