/*
 * 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.analyze.repositories;

import com.google.common.base.Joiner;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import io.crate.analyze.GenericPropertiesConverter;
import io.crate.analyze.ParameterContext;
import io.crate.metadata.settings.SettingsApplier;
import io.crate.metadata.settings.SettingsAppliers;
import io.crate.metadata.settings.StringSetting;
import io.crate.sql.tree.GenericProperties;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.inject.Singleton;
import org.elasticsearch.common.settings.Settings;

import java.util.Locale;
import java.util.Map;
import java.util.Optional;
import java.util.Set;

@Singleton
public class RepositoryParamValidator {
    private final Map<String, TypeSettings> typeSettings;

    @Inject
    public RepositoryParamValidator(Map<String, TypeSettings> repositoryTypeSettings) {
        typeSettings = repositoryTypeSettings;
    }

    public Settings convertAndValidate(String type, Optional<GenericProperties> genericProperties, ParameterContext parameterContext) {
        TypeSettings typeSettings = this.typeSettings.get(type);
        if (typeSettings == null) {
            throw new IllegalArgumentException(String.format(Locale.ENGLISH, "Invalid repository type \"%s\"", type));
        }

        Map<String, SettingsApplier> allSettings = typeSettings.all();

        // create string settings applier for all dynamic settings
        Optional<GenericProperties> dynamicProperties = typeSettings.dynamicProperties(genericProperties);
        if (dynamicProperties.isPresent()) {
            // allSettings are immutable by default, copy map
            allSettings = Maps.newHashMap(allSettings);
            for (String key : dynamicProperties.get().properties().keySet()) {
                allSettings.put(key, new SettingsAppliers.StringSettingsApplier(new StringSetting(key)));
            }
        }

        // convert and validate all settings
        Settings settings = GenericPropertiesConverter.settingsFromProperties(
            genericProperties, parameterContext, allSettings).build();

        Set<String> names = settings.getAsMap().keySet();
        Sets.SetView<String> missingRequiredSettings = Sets.difference(typeSettings.required().keySet(), names);
        if (!missingRequiredSettings.isEmpty()) {
            throw new IllegalArgumentException(String.format(Locale.ENGLISH,
                "The following required parameters are missing to create a repository of type \"%s\": [%s]",
                type, Joiner.on(", ").join(missingRequiredSettings)));
        }

        return settings;
    }
}