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/*
 * Copyright 2012 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
 *
 *      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.gradle.api.internal.tasks.testing.logging;

import org.gradle.api.logging.LogLevel;
import org.gradle.api.tasks.testing.*;
import org.gradle.api.tasks.testing.TestResult;
import org.gradle.api.tasks.testing.logging.TestLogEvent;
import org.gradle.api.tasks.testing.logging.TestLogging;
import org.gradle.internal.logging.text.StyledTextOutputFactory;
import org.gradle.util.TextUtil;

/**
 * Console logger for test events.
 */
public class TestEventLogger extends AbstractTestLogger implements TestListener, TestOutputListener {
    private static final String INDENT = "    ";

    private final TestExceptionFormatter exceptionFormatter;
    private final TestLogging testLogging;

    public TestEventLogger(StyledTextOutputFactory textOutputFactory, LogLevel logLevel, TestLogging testLogging, TestExceptionFormatter exceptionFormatter) {
        super(textOutputFactory, logLevel, testLogging.getDisplayGranularity());
        this.exceptionFormatter = exceptionFormatter;
        this.testLogging = testLogging;
    }

    @Override
    public void beforeSuite(TestDescriptor descriptor) {
        before(descriptor);
    }

    @Override
    public void afterSuite(TestDescriptor descriptor, TestResult result) {
        after(descriptor, result);
    }

    @Override
    public void beforeTest(TestDescriptor descriptor) {
        before(descriptor);
    }

    @Override
    public void afterTest(TestDescriptor descriptor, TestResult result) {
        after(descriptor, result);
    }

    @Override
    public void onOutput(TestDescriptor descriptor, TestOutputEvent outputEvent) {
        if (outputEvent.getDestination() == TestOutputEvent.Destination.StdOut
                && isLoggedEventType(TestLogEvent.STANDARD_OUT)) {
            logEvent(descriptor, TestLogEvent.STANDARD_OUT, TextUtil.indent(outputEvent.getMessage(), INDENT) + "\n");
        } else if (outputEvent.getDestination() == TestOutputEvent.Destination.StdErr
                && isLoggedEventType(TestLogEvent.STANDARD_ERROR)) {
            logEvent(descriptor, TestLogEvent.STANDARD_ERROR, TextUtil.indent(outputEvent.getMessage(), INDENT) + "\n");
        }
    }

    private void before(TestDescriptor descriptor) {
        if (shouldLogEvent(descriptor, TestLogEvent.STARTED)) {
            logEvent(descriptor, TestLogEvent.STARTED);
        }
    }

    private void after(TestDescriptor descriptor, TestResult result) {
        TestLogEvent event = getEvent(result);

        if (shouldLogEvent(descriptor, event)) {
            String details = shouldLogExceptions(result) ? exceptionFormatter.format(descriptor, result.getExceptions()) : null;
            logEvent(descriptor, event, details);
        }
    }

    private TestLogEvent getEvent(TestResult result) {
        switch (result.getResultType()) {
            case SUCCESS: return TestLogEvent.PASSED;
            case FAILURE: return TestLogEvent.FAILED;
            case SKIPPED: return TestLogEvent.SKIPPED;
            default: throw new AssertionError();
        }
    }

    private boolean shouldLogEvent(TestDescriptor descriptor, TestLogEvent event) {
        return isLoggedGranularity(descriptor) && isLoggedEventType(event);
    }

    private boolean shouldLogExceptions(TestResult result) {
        return testLogging.getShowExceptions() && !result.getExceptions().isEmpty();
    }

    private boolean isLoggedGranularity(TestDescriptor descriptor) {
        int level = getLevel(descriptor);
        return ((testLogging.getMinGranularity() == -1 && !descriptor.isComposite())
                || testLogging.getMinGranularity() > -1 && level >= testLogging.getMinGranularity())
            && (testLogging.getMaxGranularity() == -1 || level <= testLogging.getMaxGranularity());
    }

    private int getLevel(TestDescriptor descriptor) {
        int level = 0;
        while (descriptor.getParent() != null) {
            level++;
            descriptor = descriptor.getParent();
        }
        return level;
    }

    private boolean isLoggedEventType(TestLogEvent event) {
        return testLogging.getEvents().contains(event);
    }
}