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/*
  Copyright (c) 2012, 2015, Credit Suisse (Anatole Tresch), Werner Keil and others by the @author tag.

  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 org.javamoney.moneta.convert.imf;

import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.YearMonth;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import javax.money.CurrencyUnit;
import javax.money.convert.ConversionQuery;
import javax.money.convert.ExchangeRate;
import javax.money.convert.ProviderContext;
import javax.money.convert.ProviderContextBuilder;
import javax.money.convert.RateType;
import javax.money.spi.Bootstrap;

import org.javamoney.moneta.convert.imf.IMFRateReadingHandler.RateIMFResult;
import org.javamoney.moneta.spi.loader.LoaderService;

/**
 * Find by historic from IMF
 * @author otaviojava
 * @since 1.0.1
 */
public class IMFHistoricRateProvider extends IMFAbstractRateProvider {

    private static final Logger LOG = Logger.getLogger(IMFHistoricRateProvider.class.getName());

    private static final String DATA_ID = IMFHistoricRateProvider.class.getSimpleName();

	private static final ProviderContext CONTEXT = ProviderContextBuilder.of("IMF-HIST", RateType.HISTORIC)
			.set("providerDescription", "Historic International Monetary Fund")
			.set("days", 0)
			//.set("User-Agent", "Chrome/51.0.2704.103") This was a URLConnection hack, OkHttp works without the User-Agent
			.build();

	private final List cachedHistoric = new ArrayList<>();
	public IMFHistoricRateProvider() {
		super(CONTEXT);
		 LoaderService loader = Bootstrap.getService(LoaderService.class);
	        loader.addLoaderListener(this, DATA_ID);
	        try {
	            loader.loadData(DATA_ID);
	        } catch (IOException e) {
	        	LOG.log(Level.WARNING, "Error loading initial data from IMF provider...", e);
	        }
	}

	@Override
	public ExchangeRate getExchangeRate(ConversionQuery conversionQuery) {
		LocalDate[] times = getQueryDates(conversionQuery);
		if(Objects.isNull(times)) {
			return super.getExchangeRate(conversionQuery);
		}

		for (YearMonth yearMonth : Stream.of(times).map(YearMonth::from)
				.collect(Collectors.toSet())) {

			if(!cachedHistoric.contains(yearMonth)){
				Map resources = IMFRemoteSearch.INSTANCE.getResources(yearMonth,
						getContext().get("User-Agent", String.class));
				loadFromRemote(resources);
				cachedHistoric.add(yearMonth);
			}
		}
		return super.getExchangeRate(conversionQuery);
	}

	private void loadFromRemote(Map resources) {
		try {
			for(IMFHistoricalType type: resources.keySet()) {
				RateIMFResult result = handler.read(resources.get(type));
				combine(result.getSdrToCurrency(), this.sdrToCurrency);
				combine(result.getCurrencyToSdr(), this.currencyToSdr);
			}
	    } catch (Exception e) {
	    	LOG.log(Level.SEVERE, "Error", e);
	    }
	}

	private Map> combine(Map> source, Map> destination) {
		for(CurrencyUnit currency: source.keySet()) {
			destination.putIfAbsent(currency, new ArrayList<>());
			List rates = source.get(currency);
			destination.merge(currency, rates, IMFHistoricRateProvider::merge);
		}
		return destination;
	}
	private static List merge(List ratesA, List ratesB) {
		ratesA.addAll(ratesB);
		ratesA.sort(COMPARATOR_EXCHANGE_BY_LOCAL_DATE.reversed());
		return ratesA;
	}
}