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/*
 * Copyright 2017 The RoboZonky Project
 *
 * 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.common.extensions;

import java.util.Optional;
import java.util.ServiceLoader;
import java.util.stream.Stream;

import com.github.triceo.robozonky.api.confirmations.ConfirmationProvider;
import com.github.triceo.robozonky.api.confirmations.ConfirmationProviderService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public final class ConfirmationProviderLoader {

    private static final Logger LOGGER = LoggerFactory.getLogger(ConfirmationProviderLoader.class);
    private static final ServiceLoader LOADER =
            ExtensionsManager.INSTANCE.getServiceLoader(ConfirmationProviderService.class);

    static Optional load(final String providerId,
                                               final Iterable loader) {
        ConfirmationProviderLoader.LOGGER.trace("Looking up confirmation provider '{}'.", providerId);
        return Util.toStream(loader)
                .peek(cp ->
                              ConfirmationProviderLoader.LOGGER.debug(
                                      "Evaluating confirmation provider '{}' with '{}'.",
                                      providerId, cp.getClass()))
                .map(cp -> cp.find(providerId))
                .flatMap(o -> o.map(Stream::of).orElse(Stream.empty()))
                .findFirst();
    }

    public static Optional load(final String providerId) {
        return ConfirmationProviderLoader.load(providerId, ConfirmationProviderLoader.LOADER);
    }
}