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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 2012-2016 the original author or authors.
 */
package com.fitbur.assertj.error;

import static com.fitbur.assertj.util.Objects.areEqual;

public class ShouldHaveCause extends BasicErrorMessageFactory {

  public static ErrorMessageFactory shouldHaveCause(Throwable actualCause, Throwable expectedCause) {
	if (expectedCause == null) throw new IllegalArgumentException("expected cause should not be null");
	// actualCause has no cause
	if (actualCause == null) return new ShouldHaveCause(expectedCause);
	// same message => different type
	if (areEqual(actualCause.getMessage(), expectedCause.getMessage()))
	  return new ShouldHaveCause(actualCause, expectedCause.getClass());
	// same type => different message
	if (areEqual(actualCause.getClass(), expectedCause.getClass()))
	  return new ShouldHaveCause(actualCause, expectedCause.getMessage());
	return new ShouldHaveCause(actualCause, expectedCause);
  }

  private ShouldHaveCause(Throwable actualCause, Throwable expectedCause) {
	super("%n" +
	      "Expecting a cause with type:%n" +
	      "  <%s>%n" +
	      "and message:%n" +
	      "  <%s>%n" +
	      "but type was:%n" +
	      "  <%s>%n" +
	      "and message was:%n" +
	      "  <%s>.",
	      expectedCause.getClass().getName(), expectedCause.getMessage(),
	      actualCause.getClass().getName(), actualCause.getMessage());
  }

  private ShouldHaveCause(Throwable expectedCause) {
	super("%n" +
		"Expecting a cause with type:%n" +
		"  <%s>%n" +
		"and message:%n" +
		"  <%s>%n" +
		"but actualCause had no cause.",
		expectedCause.getClass().getName(), expectedCause.getMessage());
  }
  
  private ShouldHaveCause(Throwable actualCause, Class expectedCauseClass) {
	super("%n" +
	      "Expecting a cause with type:%n" +
	      "  <%s>%n" +
	      "but type was:%n" +
	      "  <%s>.",
	      actualCause.getClass().getName(), expectedCauseClass.getName());
  }

  private ShouldHaveCause(Throwable actualCause, String expectedCauseMessage) {
	super("%n" +
	      "Expecting a cause with message:%n" +
	      "  <%s>%n" +
	      "but message was:%n" +
	      "  <%s>.",
	      expectedCauseMessage, actualCause.getMessage());
  }
}