package com.yablochkov.ocppstub;

import eu.chargetime.ocpp.model.core.*;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import java.nio.charset.StandardCharsets;
import java.time.ZonedDateTime;
import java.util.Base64;
import java.util.UUID;

@Slf4j
@Service
@RequiredArgsConstructor
public class BootService {
    private final static int PASSWD = 1;
    public final static int INTERVAL_SEC = 10;

    private final SessionService sessionService;
    private final TriggerService triggerService;

    public BootNotificationConfirmation handle(UUID sessionIndex, BootNotificationRequest request) {
        String auth = sessionService.getAuthBySessionId(sessionIndex);
        String passwd = getPasswd(auth);

        if (passwd != null) {
            log.info("Accept boot request {}", sessionIndex);
            triggerService.bootCompleted(sessionIndex);
            return createResponse(RegistrationStatus.Accepted);
        }

        log.info("Pending boot request {}", sessionIndex);
        return createResponse(RegistrationStatus.Pending);
    }

    private String getPasswd(String basic) {
        if (basic != null && !basic.isEmpty()) {
            byte[] credDecoded = Base64.getDecoder().decode(basic.substring("Basic ".length()));
            String credentials = new String(credDecoded, StandardCharsets.UTF_8);
            if (credentials.contains(":")) {
                String[] parsedCredential = credentials.split(":", 2);
                return parsedCredential[PASSWD];
            }
        }
        return null;
    }

    private BootNotificationConfirmation createResponse(RegistrationStatus status) {
        return new BootNotificationConfirmation(ZonedDateTime.now(), INTERVAL_SEC, status);
    }
}