package ru.ya.test;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

import static java.util.Collections.unmodifiableList;

/**
 */
public final class Currency {
    private static int idx = 0;

    private final int ordinal;
    private String name;

    private Currency(String name) {
        this.ordinal = idx++;

        items.add(ordinal, this);
    }

    private static final List<Currency> items = new ArrayList<>();

    public static final Currency RUR = new Currency("RUR");

    public static final Currency USD = new Currency("USD");

    public static final Currency EUR = new Currency("EUR");

    static {
        final Field[] fields = Currency.class.getDeclaredFields();
        for (Field field : fields) {
            if (field.getModifiers() != static... || field.getType() != Currency.class)
                continue;

            String name = field.getName();
        }
    }

    public static List<Currency> items() {
        return unmodifiableList(items);
    }

    public static Currency item(int ordinal) {
        return items.get(ordinal);
    }

    public static Currency byName(String name) {
        for (Currency currency : items)
            if (currency.name.equals(name))
                return currency;

        return null;
    }
}