/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate 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
 *
 *     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.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.azure.plugin;

import io.crate.azure.AzureModule;
import io.crate.azure.discovery.AzureDiscovery;
import io.crate.azure.discovery.AzureUnicastHostsProvider;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.common.component.LifecycleComponent;
import org.elasticsearch.common.inject.Module;
import org.elasticsearch.common.logging.Loggers;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.discovery.DiscoveryModule;
import org.elasticsearch.plugins.Plugin;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;

import static io.crate.azure.management.AzureComputeService.Discovery.DISCOVERY_METHOD;
import static io.crate.azure.management.AzureComputeService.Discovery.HOST_TYPE;
import static io.crate.azure.management.AzureComputeService.Discovery.REFRESH;
import static io.crate.azure.management.AzureComputeService.Management.*;


public class AzureDiscoveryPlugin extends Plugin {

    private final Settings settings;
    protected final Logger logger = Loggers.getLogger(AzureDiscoveryPlugin.class);

    public AzureDiscoveryPlugin(Settings settings) {
        this.settings = settings;
    }

    public String name() {
        return "crate-azure-discovery";
    }

    public String description() {
        return "Azure Discovery Plugin";
    }

    @Override
    public List<Setting<?>> getSettings() {
        List<Setting<?>> settings = Arrays.asList(
            SUBSCRIPTION_ID,
            RESOURCE_GROUP_NAME,
            TENANT_ID,
            APP_ID,
            APP_SECRET,
            REFRESH,
            HOST_TYPE,
            DISCOVERY_METHOD
        );
        return settings;
    }

    @Override
    public Collection<Module> createGuiceModules() {
        List<Module> modules = new ArrayList<>();
        if (AzureModule.isDiscoveryReady(settings, logger)) {
            modules.add(new AzureModule());
        }
        return modules;
    }

    @Override
    public Collection<Class<? extends LifecycleComponent>> getGuiceServiceClasses() {
        Collection<Class<? extends LifecycleComponent>> services = new ArrayList<>();
        if (AzureModule.isDiscoveryReady(settings, logger)) {
            services.add(AzureModule.getComputeServiceImpl());
        }
        return services;
    }

    public void onModule(DiscoveryModule discoveryModule) {
        if (AzureModule.isDiscoveryReady(settings, logger)) {
            discoveryModule.addDiscoveryType("azure", AzureDiscovery.class);
            discoveryModule.addUnicastHostProvider("azure", AzureUnicastHostsProvider.class);
        }
    }

}