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/*
 *  Copyright 2022 Red Hat
 *
 *  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
 *
 *      https://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.jboss.hal.meta;

import java.util.Map;
import java.util.Set;

import org.jboss.hal.db.PouchDB;
import org.jboss.hal.dmr.ResourceAddress;

import elemental2.promise.Promise;

import static java.util.function.Function.identity;
import static java.util.stream.Collectors.toMap;
import static java.util.stream.Collectors.toSet;

/** Abstract database which uses the specified statement context to resolve address templates. */
public abstract class AbstractDatabase implements Database {

    private final StatementContext statementContext;
    private final String type;

    protected AbstractDatabase(StatementContext statementContext, String type) {
        this.statementContext = statementContext;
        this.type = type;
    }

    @Override
    public ResourceAddress resolveTemplate(AddressTemplate template) {
        return template.resolve(statementContext);
    }

    @Override
    public Map resolveTemplates(Set templates) {
        return templates.stream().collect(toMap(template -> template.resolve(statementContext), identity()));
    }

    @Override
    public Promise> getAll(Set templates) {
        Set ids = templates.stream()
                .map(template -> template.resolve(statementContext).toString())
                .collect(toSet());
        return database().getAll(ids)
                .then(documents -> {
                    Map metadata = documents.stream().collect(toMap(
                            document -> ResourceAddress.from(document.getId()),
                            this::asMetadata));
                    return Promise.resolve(metadata);
                });
    }

    @Override
    public Promise> getRecursive(AddressTemplate template) {
        String id = template.resolve(statementContext).toString();
        return database().prefixSearch(id)
                .then(documents -> {
                    Map metadata = documents.stream().collect(toMap(
                            document -> ResourceAddress.from(document.getId()),
                            this::asMetadata));
                    return Promise.resolve(metadata);
                });
    }

    @Override
    public String type() {
        return type;
    }

    protected abstract PouchDB database();
}