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/*
 * Copyright 2015-2016 the original author or authors.
 *
 * All rights reserved. This program and the accompanying materials are
 * made available under the terms of the Eclipse Public License v1.0 which
 * accompanies this distribution and is available at
 *
 * http://www.eclipse.org/legal/epl-v10.html
 */

package org.junit.gen5.console.tasks;

import static java.util.Collections.emptyList;
import static org.junit.gen5.engine.TestExecutionResult.Status.ABORTED;
import static org.junit.gen5.engine.TestExecutionResult.Status.SUCCESSFUL;

import java.time.Clock;
import java.time.Duration;
import java.time.Instant;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Predicate;

import org.junit.gen5.commons.util.ExceptionUtils;
import org.junit.gen5.engine.TestExecutionResult;
import org.junit.gen5.engine.reporting.ReportEntry;
import org.junit.gen5.launcher.TestIdentifier;
import org.junit.gen5.launcher.TestPlan;

class XmlReportData {

	private static final int MILLIS_PER_SECOND = 1000;

	private final Map finishedTests = new ConcurrentHashMap<>();
	private final Map skippedTests = new ConcurrentHashMap<>();
	private final Map startInstants = new ConcurrentHashMap<>();
	private final Map endInstants = new ConcurrentHashMap<>();
	private final Map> reportEntries = new ConcurrentHashMap<>();

	private final TestPlan testPlan;
	private final Clock clock;

	XmlReportData(TestPlan testPlan, Clock clock) {
		this.testPlan = testPlan;
		this.clock = clock;
	}

	TestPlan getTestPlan() {
		return testPlan;
	}

	Clock getClock() {
		return clock;
	}

	void markSkipped(TestIdentifier testIdentifier, String reason) {
		skippedTests.put(testIdentifier, reason == null ? "" : reason);
	}

	void markStarted(TestIdentifier testIdentifier) {
		startInstants.put(testIdentifier, clock.instant());
	}

	void markFinished(TestIdentifier testIdentifier, TestExecutionResult result) {
		endInstants.put(testIdentifier, clock.instant());
		if (result.getStatus() == ABORTED) {
			String reason = result.getThrowable().map(ExceptionUtils::readStackTrace).orElse("");
			skippedTests.put(testIdentifier, reason);
		}
		else {
			finishedTests.put(testIdentifier, result);
		}
	}

	void addReportEntry(TestIdentifier testIdentifier, ReportEntry entry) {
		List entries = reportEntries.computeIfAbsent(testIdentifier, key -> new ArrayList<>());
		entries.add(entry);
	}

	boolean wasSkipped(TestIdentifier testIdentifier) {
		return findSkippedAncestor(testIdentifier).isPresent();
	}

	double getDurationInSeconds(TestIdentifier testIdentifier) {
		Instant startInstant = startInstants.getOrDefault(testIdentifier, Instant.EPOCH);
		Instant endInstant = endInstants.getOrDefault(testIdentifier, startInstant);
		return Duration.between(startInstant, endInstant).toMillis() / (double) MILLIS_PER_SECOND;
	}

	String getSkipReason(TestIdentifier testIdentifier) {
		return findSkippedAncestor(testIdentifier).map(skippedTestIdentifier -> {
			String reason = skippedTests.get(skippedTestIdentifier);
			if (!testIdentifier.equals(skippedTestIdentifier)) {
				reason = "parent was skipped: " + reason;
			}
			return reason;
		}).orElse(null);
	}

	Optional getResult(TestIdentifier testIdentifier) {
		if (finishedTests.containsKey(testIdentifier)) {
			return Optional.of(finishedTests.get(testIdentifier));
		}
		Optional parent = testPlan.getParent(testIdentifier);
		Optional ancestor = findAncestor(parent, finishedTests::containsKey);
		if (ancestor.isPresent()) {
			TestExecutionResult result = finishedTests.get(ancestor.get());
			if (result.getStatus() != SUCCESSFUL) {
				return Optional.of(result);
			}
		}
		return Optional.empty();
	}

	List getReportEntries(TestIdentifier testIdentifier) {
		return reportEntries.getOrDefault(testIdentifier, emptyList());
	}

	private Optional findSkippedAncestor(TestIdentifier testIdentifier) {
		return findAncestor(Optional.of(testIdentifier), skippedTests::containsKey);
	}

	private Optional findAncestor(Optional testIdentifier,
			Predicate predicate) {
		Optional current = testIdentifier;
		while (current.isPresent()) {
			if (predicate.test(current.get())) {
				return current;
			}
			current = testPlan.getParent(current.get());
		}
		return Optional.empty();
	}

	static boolean isFailure(Optional throwable) {
		return throwable.isPresent() && throwable.get() instanceof AssertionError;
	}

}