/*
 * Copyright 2017 Lukáš Petrovický
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.github.triceo.robozonky.app.authentication;

import java.time.Duration;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalAmount;
import java.util.function.Function;

import com.github.triceo.robozonky.api.Refreshable;
import com.github.triceo.robozonky.api.remote.entities.ZonkyApiToken;
import com.github.triceo.robozonky.common.remote.ApiProvider;
import com.github.triceo.robozonky.common.remote.Zonky;
import com.github.triceo.robozonky.common.secrets.SecretProvider;
import com.github.triceo.robozonky.util.Scheduler;

class TokenBasedAccess implements Authenticated {

    private final Refreshable<ZonkyApiToken> refreshableToken;
    private final SecretProvider secrets;
    private final ApiProvider apis;

    TokenBasedAccess(final ApiProvider apis, final SecretProvider secrets, final TemporalAmount refreshAfter) {
        this.apis = apis;
        this.secrets = secrets;
        this.refreshableToken = new RefreshableZonkyApiToken(apis, secrets);
        final long refreshSeconds = Math.max(60, refreshAfter.get(ChronoUnit.SECONDS) - 60);
        final TemporalAmount refresh = Duration.ofSeconds(refreshSeconds);
        Scheduler.BACKGROUND_SCHEDULER.submit(refreshableToken, refresh);
    }

    @Override
    public <T> T call(final Function<Zonky, T> operation) {
        final ZonkyApiToken token = refreshableToken.getLatest()
                .orElseThrow(() -> new IllegalStateException("No API token available, authentication failed."));
        try (final Refreshable.Pause p = refreshableToken.pause()) { // pause token refresh during this request
            try (final Zonky zonky = apis.authenticated(token)) {
                return operation.apply(zonky);
            }
        }
    }

    @Override
    public SecretProvider getSecretProvider() {
        return secrets;
    }
}

@@ -789,24 +789,72 @@
 on.Function;
+%0Aimport javax.ws.rs.ServiceUnavailableException;
 %0A%0Aimport com
@@ -2072,19 +2072,25 @@
 new 
-IllegalStat
+ServiceUnavailabl
 eExc

Throw proper exception when login credentials are missing