/*
 * Copyright 2018 the original author or authors.
 *
 * 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 com.webauthn4j.util;

import org.checkerframework.checker.nullness.qual.NonNull;
import org.checkerframework.checker.nullness.qual.Nullable;

import java.util.Collection;

/**
 * Assertion utility class that assists in validating arguments.
 * <p>
 * Members are copied from org.springframework.util.Assert class
 * <p>
 * Original Assert class authors:
 * Keith Donald
 * Juergen Hoeller
 * Sam Brannen
 * Colin Sampaleanu
 * Rob Harrop
 */
public class AssertUtil {

    private AssertUtil() {
    }


    /**
     * Assert that an object is not {@code null}.
     * <pre class="code">Assert.notNull(clazz, "The class must not be null");</pre>
     *
     * @param object  the object to check
     * @param message the exception message to use if the assertion fails
     * @throws IllegalArgumentException if the object is {@code null}
     */
    public static void notNull(@Nullable Object object, @NonNull String message) {
        if (object == null) {
            throw new IllegalArgumentException(message);
        }
    }

    /**
     * Assert that an array contains elements; that is, it must not be
     * {@code null} and must contain at least one element.
     * <pre class="code">Assert.notEmpty(array, "The array must contain elements");</pre>
     *
     * @param array   the array to check
     * @param message the exception message to use if the assertion fails
     * @throws IllegalArgumentException if the object array is {@code null} or contains no elements
     */
    public static void notEmpty(@Nullable Object[] array, @NonNull String message) {
        if (array == null || array.length == 0) {
            throw new IllegalArgumentException(message);
        }
    }

    /**
     * Assert that a collection contains elements; that is, it must not be
     * {@code null} and must contain at least one element.
     * <pre class="code">Assert.notEmpty(collection, "Collection must contain elements");</pre>
     *
     * @param collection the collection to check
     * @param message    the exception message to use if the assertion fails
     * @throws IllegalArgumentException if the collection is {@code null} or
     *                                  contains no elements
     */
    public static void notEmpty(@Nullable Collection<?> collection, @NonNull String message) {
        if (collection == null || collection.isEmpty()) {
            throw new IllegalArgumentException(message);
        }
    }

    public static void isTrue(boolean condition, @NonNull String message) {
        if (!condition) {
            throw new IllegalArgumentException(message);
        }
    }
}
