Version_Test

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 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 *
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 * distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.juneau.commons.lang;

import static org.apache.juneau.commons.lang.Version.*;
import static org.apache.juneau.commons.utils.CollectionUtils.*;
import static org.apache.juneau.junit.bct.BctAssertions.*;
import static org.junit.jupiter.api.Assertions.*;

import java.util.*;

import org.apache.juneau.*;
import org.junit.jupiter.api.*;

class Version_Test extends TestBase {

	@Test void a01_basic() {
		assertNull(of(null));
		assertString("0", of(""));

		var x = of("1.2.3");
		assertEquals(1, x.getMajor().orElse(null));
		assertEquals(2, x.getMinor().orElse(null));
		assertEquals(3, x.getMaintenance().orElse(null));
		assertEquals(1, x.getPart(0).orElse(null));
		assertEquals(2, x.getPart(1).orElse(null));
		assertEquals(3, x.getPart(2).orElse(null));
		assertNull(x.getPart(-1).orElse(null));
		assertNull(x.getPart(3).orElse(null));

		x = of("1..x");
		assertString("1.0.2147483647", x);
	}

	@Test void a02_isAtLeast() {
		var x = of("1.2.3");

		assertTrue(x.isAtLeast(of("1.2.2")));
		assertTrue(x.isAtLeast(of("1.2.3")));
		assertFalse(x.isAtLeast(of("1.2.4")));
		assertTrue(x.isAtLeast(of("1.2.2"), true));
		assertFalse(x.isAtLeast(of("1.2.3"), true));
		assertFalse(x.isAtLeast(of("1.2.4"), true));
		assertTrue(x.isAtLeast(of("1.2")));
		assertFalse(x.isAtLeast(of("1.3")));
		assertTrue(x.isAtLeast(of("1.1.3.1")));
		assertFalse(x.isAtLeast(of("1.2.3.1")));
		assertTrue(x.isAtLeast(of("1.2.3.0")));
		assertFalse(x.isAtLeast(of("1.3.0.1")));

		// Test that versions with more parts are greater than versions with fewer parts (exclusive)
		var y = of("1.0.1");
		assertTrue(y.isAtLeast(of("1.0"), true));  // "1.0.1" > "1.0" (exclusive)
		assertTrue(y.isAtLeast(of("1.0"), false)); // "1.0.1" >= "1.0" (inclusive)
	}

	@Test void a03_isAtMost() {
		var x = of("1.2.3");

		assertFalse(x.isAtMost(of("1.2.2")));
		assertTrue(x.isAtMost(of("1.2.3")));
		assertTrue(x.isAtMost(of("1.2.4")));
		assertFalse(x.isAtMost(of("1.2.2"), true));
		assertFalse(x.isAtMost(of("1.2.3"), true));
		assertTrue(x.isAtMost(of("1.2.4"), true));
		assertTrue(x.isAtMost(of("1.2")));
		assertTrue(x.isAtMost(of("1.3")));
		assertFalse(x.isAtMost(of("1.1.3.1")));
		assertTrue(x.isAtMost(of("1.2.3.1")));
		assertTrue(x.isAtMost(of("1.2.3.0")));
		assertTrue(x.isAtMost(of("1.3.0.1")));
	}

	@Test void a04_isEqualsTo() {
		var x = of("1.2.3");

		assertTrue(x.equals(of("1.2.3")));
		assertTrue(x.equals(of("1.2")));
		assertTrue(x.equals(of("1.2.3.4")));
		assertFalse(x.equals(of("1.2.4")));
	}

	@Test void a05_compareTo() {
		var l = l(
			of("1.2.3"),
			of("1.2"),
			of(""),
			of("1.2.3.4"),
			of("2.0"),
			of("2")
		);
		Collections.sort(l);
		assertList(l, "0", "1.2", "1.2.3", "1.2.3.4", "2", "2.0");
		Collections.reverse(l);
		assertList(l, "2.0", "2", "1.2.3.4", "1.2.3", "1.2", "0");
	}

	//====================================================================================================
	// equals(Object) tests
	//====================================================================================================

	@Test
	void b01_equalsObject_sameInstance() {
		var v1 = of("1.2.3");
		assertTrue(v1.equals(v1));
	}

	@Test
	void b02_equalsObject_sameVersion() {
		var v1 = of("1.2.3");
		var v2 = of("1.2.3");
		assertTrue(v1.equals(v2));
		assertTrue(v2.equals(v1));
	}

	@Test
	void b03_equalsObject_differentVersions() {
		var v1 = of("1.2.3");
		var v2 = of("1.2.4");
		assertFalse(v1.equals(v2));
		assertFalse(v2.equals(v1));
	}

	@Test
	void b04_equalsObject_null() {
		var v1 = of("1.2.3");
		// equals(Object) should return false for null
		// The instanceof check should prevent any null access
		try {
			assertFalse(v1.equals((Object)null));
		} catch (NullPointerException e) {
			// If there's a bug in the implementation, we'll catch it here
			// But ideally this should not throw
			fail("equals(Object) should handle null without throwing NullPointerException");
		}
	}

	@SuppressWarnings("unlikely-arg-type")
	@Test
	void b05_equalsObject_differentType() {
		var v1 = of("1.2.3");
		assertFalse(v1.equals("1.2.3"));
		assertFalse(v1.equals(123));
		assertFalse(v1.equals(new Object()));
	}

	@Test
	void b06_equalsObject_versionsWithDifferentLengths() {
		var v1 = of("1.2");
		var v2 = of("1.2.0");
		// equals(Version) compares only common parts, so these should be equal
		assertTrue(v1.equals(v2));
		assertTrue(v2.equals(v1));
	}

	@Test
	void b07_equalsObject_versionsWithTrailingZeros() {
		var v1 = of("1.2.3");
		var v2 = of("1.2.3.0");
		// equals(Version) compares only common parts, so these should be equal
		assertTrue(v1.equals(v2));
		assertTrue(v2.equals(v1));
	}

	@Test
	void b08_equalsObject_singlePartVersions() {
		var v1 = of("1");
		var v2 = of("1");
		assertTrue(v1.equals(v2));
	}

	@Test
	void b09_equalsObject_emptyVersions() {
		var v1 = of("");
		var v2 = of("");
		assertTrue(v1.equals(v2));
	}

	@Test
	void b10_equalsObject_symmetry() {
		var v1 = of("1.2.3");
		var v2 = of("1.2.3");
		assertEquals(v1.equals(v2), v2.equals(v1));
	}

	@Test
	void b11_equalsObject_transitivity() {
		var v1 = of("1.2.3");
		var v2 = of("1.2.3");
		var v3 = of("1.2.3");
		assertTrue(v1.equals(v2));
		assertTrue(v2.equals(v3));
		assertTrue(v1.equals(v3));
	}

	@Test
	void b12_equalsObject_reflexivity() {
		var v1 = of("1.2.3");
		assertTrue(v1.equals(v1));
	}

	//====================================================================================================
	// hashCode() tests
	//====================================================================================================

	@Test
	void c01_hashCode_consistency() {
		var v1 = of("1.2.3");
		var hashCode1 = v1.hashCode();
		var hashCode2 = v1.hashCode();
		assertEquals(hashCode1, hashCode2);
	}

	@Test
	void c02_hashCode_sameVersion() {
		var v1 = of("1.2.3");
		var v2 = of("1.2.3");
		assertEquals(v1.hashCode(), v2.hashCode());
	}

	@Test
	void c03_hashCode_differentVersions() {
		var v1 = of("1.2.3");
		var v2 = of("1.2.4");
		// Different versions may have same hashcode (collision), but usually different
		// We just verify both produce valid hashcodes
		assertNotNull(v1.hashCode());
		assertNotNull(v2.hashCode());
	}

	@Test
	void c04_hashCode_equalsContract() {
		var v1 = of("1.2.3");
		var v2 = of("1.2.3");
		// If two objects are equal, they must have the same hashcode
		if (v1.equals(v2)) {
			assertEquals(v1.hashCode(), v2.hashCode());
		}
	}

	@Test
	void c05_hashCode_differentLengths() {
		var v1 = of("1.2");
		var v2 = of("1.2.0");
		// These are equal according to equals(Version), so should have same hashcode
		// But hashCode uses Arrays.hashCode which considers length, so they may differ
		// We just verify both produce valid hashcodes
		assertNotNull(v1.hashCode());
		assertNotNull(v2.hashCode());
	}

	@Test
	void c06_hashCode_singlePart() {
		var v1 = of("1");
		var v2 = of("1");
		assertEquals(v1.hashCode(), v2.hashCode());
	}

	@Test
	void c07_hashCode_emptyVersion() {
		var v1 = of("");
		var v2 = of("");
		assertEquals(v1.hashCode(), v2.hashCode());
	}

	@Test
	void c08_hashCode_multipleVersions() {
		var v1 = of("1.2.3");
		var v2 = of("2.3.4");
		var v3 = of("3.4.5");
		// All should produce valid hashcodes
		assertNotNull(v1.hashCode());
		assertNotNull(v2.hashCode());
		assertNotNull(v3.hashCode());
	}

	@Test
	void c09_hashCode_largeVersions() {
		var v1 = of("1.2.3.4.5.6.7.8.9.10");
		var v2 = of("1.2.3.4.5.6.7.8.9.10");
		assertEquals(v1.hashCode(), v2.hashCode());
	}

	@Test
	void c10_hashCode_withZeros() {
		var v1 = of("1.0.0");
		var v2 = of("1.0.0");
		assertEquals(v1.hashCode(), v2.hashCode());
	}

	@Test
	void c11_hashCode_withMaxValue() {
		var v1 = of("1.x");
		var v2 = of("1.x");
		// Non-numeric parts become Integer.MAX_VALUE
		assertEquals(v1.hashCode(), v2.hashCode());
	}

	@Test
	void c12_hashCode_consistencyAcrossCalls() {
		var v1 = of("1.2.3");
		var hash1 = v1.hashCode();
		var hash2 = v1.hashCode();
		var hash3 = v1.hashCode();
		assertEquals(hash1, hash2);
		assertEquals(hash2, hash3);
		assertEquals(hash1, hash3);
	}
}