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package org.scijava.util;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;

import org.junit.Test;

/** Unit tests for {@link ArrayUtils}. */
public class ArrayUtilsTest {

	@Test
	public void testSafeMultiply32() {
		// test vacuous edge cases
		boolean ok = false;
		try {
			ArrayUtils.safeMultiply32(null);
		}
		catch (final NullPointerException e) {
			ok = true;
		}
		if (!ok) fail("Expected NullPointerException");
		assertSafeMultiply32Pass(0);

		// test simple cases
		assertSafeMultiply32Pass(1, 1);
		assertSafeMultiply32Pass(54, 9, 6);
		assertSafeMultiply32Pass(1037836800, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13);

		// test invalid arguments
		assertSafeMultiply32Fail("Invalid array size: -1", -1);
		assertSafeMultiply32Fail("Invalid array size: 0", 0);

		// test edge cases near Integer.MAX_VALUE
		assertSafeMultiply32Pass(2147483646, Integer.MAX_VALUE / 2, 2);
		assertSafeMultiply32Fail("Array size too large: 1073741824 x 2",
			Integer.MAX_VALUE / 2 + 1, 2);
		assertSafeMultiply32Pass(2147441940, 46340, 46341);
		assertSafeMultiply32Fail("Array size too large: 46341 x 46341", 46341,
			46341);
		assertSafeMultiply32Fail("Array size too large: 46340 x 46342", 46340,
			46342);
		assertSafeMultiply32Pass(2147418112, 65536, 32767);
		assertSafeMultiply32Pass(2147450880, 65535, 32768);
		assertSafeMultiply32Fail("Array size too large: 65536 x 32768", 65536,
			32768);
	}

	@Test
	public void testSafeMultiply64() {
		// test vacuous edge cases
		boolean ok = false;
		try {
			ArrayUtils.safeMultiply64(null);
		}
		catch (final NullPointerException e) {
			ok = true;
		}
		if (!ok) fail("Expected NullPointerException");
		assertSafeMultiply64Pass(0);

		// test simple cases
		assertSafeMultiply64Pass(1, 1);
		assertSafeMultiply64Pass(54, 9, 6);
		assertSafeMultiply64Pass(3632428800L, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14);

		// test invalid arguments
		assertSafeMultiply64Fail("Invalid array size: -1", -1);
		assertSafeMultiply64Fail("Invalid array size: 0", 0);

		// test edge cases near Long.MAX_VALUE
		assertSafeMultiply64Pass(9223372036854775806L, Long.MAX_VALUE / 6, 2, 3);
		assertSafeMultiply64Fail(
			"Array size too large: 1537228672809129302 x 2 x 3",
			Long.MAX_VALUE / 6 + 1, 2, 3);
		assertSafeMultiply64Pass(9223372033963249500L, 3037000499L, 3037000500L);
		assertSafeMultiply64Fail("Array size too large: 3037000500 x 3037000500",
			3037000500L, 3037000500L);
		assertSafeMultiply64Fail("Array size too large: 3037000499 x 3037000501",
			3037000499L, 3037000501L);
	}

	// -- Helper methods --

	private void
		assertSafeMultiply32Pass(final int expected, final long... sizes)
	{
		assertEquals(expected, ArrayUtils.safeMultiply32(sizes));
	}

	private void assertSafeMultiply32Fail(final String msg, final long... sizes) {
		int actual;
		try {
			actual = ArrayUtils.safeMultiply32(sizes);
		}
		catch (final IllegalArgumentException e) {
			assertEquals(e.getMessage(), msg);
			return;
		}
		fail("Safe multiply succeeded with value: " + actual);
	}

	private void assertSafeMultiply64Pass(final long expected,
		final long... sizes)
	{
		assertEquals(expected, ArrayUtils.safeMultiply64(sizes));
	}

	private void assertSafeMultiply64Fail(final String msg, final long... sizes) {
		long actual;
		try {
			actual = ArrayUtils.safeMultiply64(sizes);
		}
		catch (final IllegalArgumentException e) {
			assertEquals(e.getMessage(), msg);
			return;
		}
		fail("Safe multiply succeeded with value: " + actual);
	}

}
