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/*
 * Copyright (C) 2011
 *   Michael Mosmann 
 *   Martin Jöhren 
 *
 * with contributions from
 * 	konstantin-ba@github,Archimedes Trajano	(trajano@github)
 *
 * 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 de.flapdoodle.embed.mongo.packageresolver;

import org.immutables.value.Value;

import java.util.Optional;

import static java.lang.Math.abs;

@Value.Immutable
public interface NumericVersion extends Comparable {
	@Value.Parameter
	int major();

	@Value.Parameter
	int minor();

	@Value.Parameter
	int patch();

	Optional build();

	@Override
	@Value.Auxiliary
	default int compareTo(NumericVersion other) {
		int mc = Integer.compare(major(), other.major());
		int mm = Integer.compare(minor(), other.minor());
		int mp = Integer.compare(patch(), other.patch());
		int build = build().orElse("").compareTo(other.build().orElse(""));

		return mc != 0 ? mc
			: mm != 0 ? mm
			: mp != 0 ? mp
			: build;
	}

	static NumericVersion of(int major, int minor, int patch) {
		return ImmutableNumericVersion.of(major, minor, patch);
	}

	static NumericVersion of(String versionString) {
		int major;
		int minor;
		int patch;
		Optional build=Optional.empty();

		if ("latest".equals(versionString)) {
			major = Integer.MAX_VALUE;
			minor = Integer.MAX_VALUE;
			patch = Integer.MAX_VALUE;
		} else {
			final String[] semverParts = versionString.split("\\.", 3);
			major = Integer.parseInt(semverParts[0], 10);
			minor = Integer.parseInt(semverParts[1], 10);
			String semverPart3 = semverParts[2];

			final int idxOfDash = semverPart3.indexOf('-');
			// cut any -RC/-M
			if (idxOfDash > 0) {
				build = Optional.of(semverPart3.substring(idxOfDash+1));
				semverPart3 = semverPart3.substring(0, idxOfDash);
			}
			patch = Integer.parseInt(semverPart3, 10);
		}

		return ImmutableNumericVersion.of(major, minor, patch)
			.withBuild(build);
	}

	default boolean isNewerOrEqual(int major, int minor, int patch) {
		return isNewerOrEqual(NumericVersion.of(major, minor, patch));
	}

	default boolean isOlderOrEqual(int major, int minor, int patch) {
		return isOlderOrEqual(NumericVersion.of(major, minor, patch));
	}

	default boolean isNewerOrEqual(NumericVersion other) {
		return isNewer(other) || isEqual(other);
	}

	default boolean isNewer(NumericVersion other) {
		return compareTo(other)>0;
	}

	default boolean isOlderOrEqual(NumericVersion other) {
		return isOlder(other) || isEqual(other);
	}

	default boolean isOlder(NumericVersion other) {
		return compareTo(other)<0;
	}

	default boolean isEqual(NumericVersion other) {
		return compareTo(other) == 0;
	}

	default boolean isNextOrPrevPatch(NumericVersion other) {
		if (major() != other.major()) return false;
		if (minor() != other.minor()) return false;
		return abs(patch() - other.patch()) == 1;
	}

	default String asString() {
		return build().isPresent()
			? major() + "." + minor() + "." + patch() + "-" + build().get()
			: major() + "." + minor() + "." + patch();
	}
}