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/*
 * Copyright 2015-2020 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 v2.0 which
 * accompanies this distribution and is available at
 *
 * https://www.eclipse.org/legal/epl-v20.html
 */

package org.junit.jupiter.api.condition;

import static java.lang.String.format;
import static org.junit.jupiter.api.extension.ConditionEvaluationResult.disabled;
import static org.junit.jupiter.api.extension.ConditionEvaluationResult.enabled;

import org.junit.jupiter.api.extension.ConditionEvaluationResult;
import org.junit.jupiter.api.extension.ExecutionCondition;
import org.junit.platform.commons.util.Preconditions;

/**
 * {@link ExecutionCondition} for {@link DisabledIfEnvironmentVariable @DisabledIfEnvironmentVariable}.
 *
 * @since 5.1
 * @see DisabledIfEnvironmentVariable
 */
class DisabledIfEnvironmentVariableCondition
		extends AbstractRepeatableAnnotationCondition {

	private static final ConditionEvaluationResult ENABLED = ConditionEvaluationResult.enabled(
		"No @DisabledIfEnvironmentVariable conditions resulting in 'disabled' execution encountered");

	DisabledIfEnvironmentVariableCondition() {
		super(DisabledIfEnvironmentVariable.class);
	}

	@Override
	protected ConditionEvaluationResult getNoDisabledConditionsEncounteredResult() {
		return ENABLED;
	}

	@Override
	protected ConditionEvaluationResult evaluate(DisabledIfEnvironmentVariable annotation) {
		String name = annotation.named().trim();
		String regex = annotation.matches();
		Preconditions.notBlank(name, () -> "The 'named' attribute must not be blank in " + annotation);
		Preconditions.notBlank(regex, () -> "The 'matches' attribute must not be blank in " + annotation);
		String actual = getEnvironmentVariable(name);

		// Nothing to match against?
		if (actual == null) {
			return enabled(format("Environment variable [%s] does not exist", name));
		}

		if (actual.matches(regex)) {
			return disabled(format("Environment variable [%s] with value [%s] matches regular expression [%s]", name,
				actual, regex), annotation.disabledReason());
		}
		// else
		return enabled(format("Environment variable [%s] with value [%s] does not match regular expression [%s]", name,
			actual, regex));
	}

	/**
	 * Get the value of the named environment variable.
	 *
	 * The default implementation simply delegates to
	 * {@link System#getenv(String)}. Can be overridden in a subclass for
	 * testing purposes.
	 */
	protected String getEnvironmentVariable(String name) {
		return System.getenv(name);
	}

}