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/*
 * Copyright (c) 2012, 2020, 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.spi.convert;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.money.MonetaryException;
import javax.money.convert.ConversionQuery;
import javax.money.convert.ExchangeRateProvider;
import javax.money.spi.Bootstrap;
import javax.money.spi.MonetaryConversionsSingletonSpi;

import org.javamoney.moneta.spi.CompoundRateProvider;
import org.javamoney.moneta.spi.MonetaryConfig;

/**
 * This is the default implementation of the {@link javax.money.spi.MonetaryConversionsSingletonSpi} interface, backing
 * up the {@link javax.money.convert.MonetaryConversions} singleton.
 */
public class DefaultMonetaryConversionsSingletonSpi implements MonetaryConversionsSingletonSpi {
    /**
     * Logger used.
     */
    private static final Logger LOG = Logger.getLogger(DefaultMonetaryConversionsSingletonSpi.class.getName());

    /**
     * The providers loaded.
     */
    private Map conversionProviders = new ConcurrentHashMap<>();

    /**
     * Constructors, loads the providers from the {@link javax.money.spi.Bootstrap} component.
     */
    public DefaultMonetaryConversionsSingletonSpi() {
        reload();
    }

    /**
     * Reloads/reinitializes the providers found.
     */
    public void reload() {
        Map newProviders = new ConcurrentHashMap<>();
        for (ExchangeRateProvider prov : Bootstrap.getServices(ExchangeRateProvider.class)) {
            newProviders.put(prov.getContext().getProviderName(), prov);
        }
        this.conversionProviders = newProviders;
    }

    @Override
    public ExchangeRateProvider getExchangeRateProvider(ConversionQuery conversionQuery) {
        Collection providers = getProvidersToUse(conversionQuery);
        List provInstances = new ArrayList<>();
        for (String provName : providers) {
            ExchangeRateProvider prov = Optional.ofNullable(
                    this.conversionProviders.get(provName))
                    .orElseThrow(
                            () -> new MonetaryException(
                                    "Unsupported conversion/rate provider: "
                                            + provName));
            provInstances.add(prov);
        }
        if (provInstances.isEmpty()) {
            throw new MonetaryException("No such providers: " + conversionQuery);
        }
        if (provInstances.size() == 1) {
            return provInstances.get(0);
        }
        return new CompoundRateProvider(provInstances);
    }

    @Override
    public boolean isExchangeRateProviderAvailable(ConversionQuery conversionQuery) {
        Collection providers = getProvidersToUse(conversionQuery);
        return !providers.isEmpty();
    }

    @Override
    public boolean isConversionAvailable(ConversionQuery conversionQuery) {
        try {
            if (isExchangeRateProviderAvailable(conversionQuery)) {
                return getExchangeRateProvider(conversionQuery).getCurrencyConversion(conversionQuery) != null;
            }
        } catch (Exception e) {
            LOG.log(Level.FINEST, "Error during availability check for conversion: " + conversionQuery, e);
        }
        return false;
    }

    @Override
    public ExchangeRateProvider getExchangeRateProvider(String... providers) {
        List provInstances = new ArrayList<>();
        for (String provName : providers) {
            ExchangeRateProvider prov = Optional.ofNullable(
                    this.conversionProviders.get(provName))
                    .orElseThrow(
                            () -> new MonetaryException(
                                    "Unsupported conversion/rate provider: "
                                            + provName));
            provInstances.add(prov);
        }
        if (provInstances.size() == 1) {
            return provInstances.get(0);
        }
        return new CompoundRateProvider(provInstances);
    }

    private Collection getProvidersToUse(ConversionQuery query) {
        List providersToUse = new ArrayList<>();
        List providerNames = query.getProviderNames();
        if (providerNames.isEmpty()) {
            providerNames = getDefaultProviderChain();
            if (providerNames.isEmpty()) {
                throw new IllegalStateException("No default provider chain available.");
            }
        }
        for (String provider : providerNames) {
            ExchangeRateProvider prov = this.conversionProviders.get(provider);
            if (prov == null) {
                throw new MonetaryException("Invalid ExchangeRateProvider (not found): " + provider);
            }
            providersToUse.add(provider);
        }
        return providersToUse;
    }

    @Override
    public Set getProviderNames() {
        return this.conversionProviders.keySet();
    }

    @Override
    public List getDefaultProviderChain() {
        List provList = new ArrayList<>();
        String defaultChain = MonetaryConfig.getString("conversion.default-chain").orElse(null);
        if(defaultChain!=null) {
            String[] items = defaultChain.split(",");
            for (String item : items) {
                if (getProviderNames().contains(item.trim())) {
                    provList.add(item);
                } else {
                    LOG.warning("Ignoring non existing default provider: " + item);
                }
            }
        }
        else{
            Bootstrap.getServices(ExchangeRateProvider.class).forEach(
                    p -> provList.add(p.getContext().getProviderName())
            );
        }
        return provList;
    }


}