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Rich and fluent assertions for testing Vavr tools
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/*
 * 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.
 *
 * Copyright 2017-2021 the original author or authors.
 */
package org.assertj.vavr.api;

import io.vavr.control.Either;
import org.assertj.core.error.BasicErrorMessageFactory;

/**
 * Build error message when an {@link Either} should contain a value being an instance of a specific class.
 *
 * @author Michał Chmielarz
 */
class EitherShouldContainInstanceOf extends BasicErrorMessageFactory {

    private static final String EXPECTING_TO_CONTAIN_BUT_IS_LEFT = "%nExpecting:%n  <%s>%nto contain on right side:%n  <%s>%nbut was left-sided.";
    private static final String EXPECTING_TO_CONTAIN_BUT_IS_RIGHT = "%nExpecting:%n  <%s>%nto contain on left side:%n  <%s>%nbut was right-sided.";
    private static final String EXPECTING_TO_CONTAIN_DIFFERENT_INSTANCE = "%nExpecting:%n <%s>%nto contain a value that is an instance of:%n <%s>%nbut did contain an instance of:%n <%s>";

    private EitherShouldContainInstanceOf(String message) {
        super(message);
    }

    /**
     * Indicates that a value should be present in a right-sided {@link io.vavr.control.Either}.
     *
     * @param value         Either to be checked.
     * @param expectedClazz expected class of a right value
     * @return an error message factory.
     * @throws java.lang.NullPointerException if either is null.
     */
    static EitherShouldContainInstanceOf shouldContainOnRightInstanceOf(Object value, Class expectedClazz) {
        Either either = (Either) value;
        if (either.isRight()) {
            return new EitherShouldContainInstanceOf(String
              .format(
                EXPECTING_TO_CONTAIN_DIFFERENT_INSTANCE,
                either.getClass().getSimpleName(),
                expectedClazz.getName(),
                either.get().getClass().getName()));
        }
        return new EitherShouldContainInstanceOf(String
          .format(
            EXPECTING_TO_CONTAIN_BUT_IS_LEFT,
            either.getClass().getSimpleName(),
            expectedClazz.getName()));
    }

    /**
     * Indicates that a value should be present in a left-sided {@link io.vavr.control.Either}.
     *
     * @param value         Either to be checked.
     * @param expectedClazz expected class of a left value
     * @return an error message factory.
     * @throws java.lang.NullPointerException if either is null.
     */
    static EitherShouldContainInstanceOf shouldContainOnLeftInstanceOf(Object value,
                                                                       Class expectedClazz) {
        Either either = (Either) value;
        if (either.isLeft()) {
            return new EitherShouldContainInstanceOf(String
              .format(
                EXPECTING_TO_CONTAIN_DIFFERENT_INSTANCE,
                either.getClass().getSimpleName(),
                expectedClazz.getName(),
                either.getLeft().getClass().getName()));
        }
        return new EitherShouldContainInstanceOf(String
          .format(
            EXPECTING_TO_CONTAIN_BUT_IS_RIGHT,
            either.getClass().getSimpleName(),
            expectedClazz.getName()));
    }
}