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/**
 * Copyright 2017 Zaradai
 * 
 * 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 com.zaradai.gluon.cars;

import com.google.common.collect.Maps;
import com.google.common.collect.Sets;

import java.util.*;

public enum CarDB {
    INSTANCE;

    private final Map> carByMake;
    private final Map carByModel;

    CarDB() {
        carByModel = Maps.newHashMap();
        carByMake = Maps.newHashMap();
        hydrate();
    }

    private void hydrate() {
        addCar(new Car("Audi", "A3"));
        addCar(new Car("Ford", "Fiesta"));
        addCar(new Car("Ford", "Focus"));
        addCar(new Car("Ford", "Mondeo"));
        addCar(new Car("Skoda", "Yeti"));
        addCar(new Car("Volvo", "V40"));
    }

    private void addCar(Car car) {
        carByMake.computeIfAbsent(car.getMake(), (key) -> Sets.newHashSet()).add(car);
        carByModel.put(car.getModel(), car);
    }

    public Optional getByModel(String model) {
        return Optional.ofNullable(carByModel.get(model));
    }

    public Set getByMake(String make) {
        return Sets.newHashSet(carByMake.getOrDefault(make, Collections.EMPTY_SET));
    }
}