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 * Licensed to the Apache Software Foundation (ASF) under one   *
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 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF licenses this file   *
 * to you 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   *
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 * software distributed under the License is distributed on an  *
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
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package org.apache.james.modules.server;

import javax.inject.Provider;

import org.apache.commons.configuration2.HierarchicalConfiguration;
import org.apache.commons.configuration2.ex.ConfigurationException;
import org.apache.commons.configuration2.tree.ImmutableNode;
import org.apache.james.mailrepository.api.MailRepositoryStore;
import org.apache.james.mailrepository.memory.MailRepositoryLoader;
import org.apache.james.mailrepository.memory.MailRepositoryStoreConfiguration;
import org.apache.james.mailrepository.memory.MemoryMailRepositoryStore;
import org.apache.james.server.core.configuration.ConfigurationProvider;
import org.apache.james.utils.GuiceProbe;
import org.apache.james.utils.InitializationOperation;
import org.apache.james.utils.InitilizationOperationBuilder;
import org.apache.james.utils.MailRepositoryProbeImpl;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.inject.AbstractModule;
import com.google.inject.Provides;
import com.google.inject.Scopes;
import com.google.inject.Singleton;
import com.google.inject.multibindings.Multibinder;
import com.google.inject.multibindings.ProvidesIntoSet;

public class MailStoreRepositoryModule extends AbstractModule {
    public static final Logger LOGGER = LoggerFactory.getLogger(MailStoreRepositoryModule.class);

    @Override
    protected void configure() {
        bind(MemoryMailRepositoryStore.class).in(Scopes.SINGLETON);
        bind(MailRepositoryStore.class).to(MemoryMailRepositoryStore.class);

        bind(GuiceMailRepositoryLoader.class).in(Scopes.SINGLETON);
        bind(MailRepositoryLoader.class).to(GuiceMailRepositoryLoader.class);

        Multibinder.newSetBinder(binder(), GuiceProbe.class).addBinding().to(MailRepositoryProbeImpl.class);
    }

    @Provides
    @Singleton
    MailRepositoryStoreConfiguration provideConfiguration(ConfigurationProvider configurationProvider,
                                                          Provider<MailRepositoryStoreConfiguration.Item> defaultConfigurationItem)
        throws ConfigurationException {

        HierarchicalConfiguration<ImmutableNode> configuration = configurationProvider.getConfiguration("mailrepositorystore");
        MailRepositoryStoreConfiguration userConfiguration = MailRepositoryStoreConfiguration.parse(configuration);
        if (!userConfiguration.getItems().isEmpty()) {
            return userConfiguration;
        }
        LOGGER.warn("Empty MailRepository store configuration supplied. Defaulting to default configuration for this product");
        return MailRepositoryStoreConfiguration.forItems(defaultConfigurationItem.get());
    }

    @ProvidesIntoSet
    InitializationOperation startMailStore(MemoryMailRepositoryStore instance) {
        return InitilizationOperationBuilder
            .forClass(MemoryMailRepositoryStore.class)
            .init(instance::init);
    }
}
