<?php
/**
 * A short log of what went wrong: API errors and rejected notifications. Kept in one
 * option, newest last, capped, shown on the settings screen. There is no debug mode and
 * no request dump; keys are masked before anything is written.
 *
 * @package CryptowayButton
 */

namespace CryptowayButton;

defined( 'ABSPATH' ) || exit;

final class Log {

    public const OPTION = 'cryptoway_button_log';

    /** Lines kept. */
    private const MAX_LINES = 100;

    /** Longest line kept, in bytes. */
    private const MAX_LINE = 1000;

    private function __construct() {}

    /** Append a line. */
    public static function write( string $message ): void {
        $message = ApiClient::mask_secrets( $message );
        $message = (string) preg_replace( '/\s+/', ' ', trim( $message ) );

        if ( strlen( $message ) > self::MAX_LINE ) {
            $message = substr( $message, 0, self::MAX_LINE ) . '…';
        }

        $lines   = self::lines();
        $lines[] = [ 't' => time(), 'm' => $message ];
        $lines   = array_slice( $lines, -self::MAX_LINES );

        update_option( self::OPTION, $lines, false );
    }

    /**
     * Stored lines, oldest first.
     *
     * @return array<int, array{t: int, m: string}>
     */
    public static function lines(): array {
        $lines = get_option( self::OPTION, [] );

        return is_array( $lines ) ? array_values( array_filter( $lines, 'is_array' ) ) : [];
    }

    public static function clear(): void {
        delete_option( self::OPTION );
    }
}