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package io.sphere.sdk.utils;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Supplier;

import static java.lang.String.format;

public final class MapUtils {
    private MapUtils() {
    }

    public static  V getOrThrow(final Map map, final K key, Supplier exceptionSupplier) throws E {
        if (map.containsKey(key)) {
            return map.get(key);
        } else {
            throw exceptionSupplier.get();
        }
    }

    public static   Map immutableCopyOf(final Map map) {
        return Collections.unmodifiableMap(copyOf(map));
    }

    public static  Map copyOf(final Map map) {
        final Map copy = new HashMap<>();
        copy.putAll(map);
        return copy;
    }

    public static  Map mapOf(final K key, final V value) {
        final Map result = new HashMap<>();
        result.put(key, value);
        return result;
    }

    public static  Map mapOf(final K key1, final V value1, final K key2, final V value2) {
        if (key1.equals(key2)) {
            throw new IllegalArgumentException(format("Duplicate keys (%s) for map creation.", key1));
        }
        final Map result = new HashMap<>();
        result.put(key1, value1);
        result.put(key2, value2);
        return result;
    }
}