/*
 * Copyright 2008,  Unitils.org
 *
 * 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.
 */
package org.unitils.reflectionassert.report.impl;

import org.unitils.reflectionassert.report.DifferenceView;
import static org.unitils.reflectionassert.report.impl.DefaultDifferenceReport.MAX_LINE_SIZE;
import org.unitils.reflectionassert.difference.Difference;
import org.unitils.core.util.ObjectFormatter;
import junit.framework.AssertionFailedError;

/**
 * @author Filip Neven
 */
public class SimpleDifferenceView implements DifferenceView {

    private ObjectFormatter objectFormatter = new ObjectFormatter();

    /**
     * Creates a string representation of the given difference tree.
     *
     * @param difference The root difference, not null
     * @return The string representation, not null
     */
    public String createView(Difference difference) {
        String expectedStr = objectFormatter.format(difference.getLeftValue());
        String actualStr = objectFormatter.format(difference.getRightValue());
        String formattedOnOneLine = formatOnOneLine(expectedStr, actualStr);
        if (AssertionFailedError.class.getName().length() + 2  + formattedOnOneLine.length() < MAX_LINE_SIZE) {
            return formattedOnOneLine;
        } else {
            return formatOnTwoLines(expectedStr, actualStr);
        }
    }

    protected String formatOnOneLine(String expectedStr, String actualStr) {
        return new StringBuilder().append("Expected: ").append(expectedStr).append(", actual: ").append(actualStr).toString();
    }

    protected String formatOnTwoLines(String expectedStr, String actualStr) {
        StringBuilder result = new StringBuilder();
        result.append("\nExpected: ").append(expectedStr);
        result.append("\n  Actual: ").append(actualStr);
        return result.toString();
    }
}