/*

 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 * questions.

 */

import static jdk.testlibrary.Asserts.*;

/* @test

 * @summary Tests the different assertions in the Assert class

 */

public class AssertsTest {

    private static class Foo implements Comparable<Foo> {

        final int id;

        public Foo(int id) {

            this.id = id;

        }

        public int compareTo(Foo f) {

            return new Integer(id).compareTo(new Integer(f.id));

        }

        public String toString() {

            return "Foo(" + Integer.toString(id) + ")";

        }

    }

    public static void main(String[] args) throws Exception {

        testLessThan();

        testLessThanOrEqual();

        testEquals();

        testGreaterThanOrEqual();

        testGreaterThan();

        testNotEquals();

        testNull();

        testNotNull();

        testTrue();

        testFalse();

        testFail();

    }

    private static void testLessThan() throws Exception {

        expectPass(Assertion.LT, 1, 2);

        expectFail(Assertion.LT, 2, 2);

        expectFail(Assertion.LT, 2, 1);

        expectFail(Assertion.LT, null, 2);

        expectFail(Assertion.LT, 2, null);

    }

    private static void testLessThanOrEqual() throws Exception {

        expectPass(Assertion.LTE, 1, 2);

        expectPass(Assertion.LTE, 2, 2);

        expectFail(Assertion.LTE, 3, 2);

        expectFail(Assertion.LTE, null, 2);

        expectFail(Assertion.LTE, 2, null);

    }

    private static void testEquals() throws Exception {

        expectPass(Assertion.EQ, 1, 1);

        expectPass(Assertion.EQ, (Comparable)null, (Comparable)null);

        Foo f1 = new Foo(1);

        expectPass(Assertion.EQ, f1, f1);

        Foo f2 = new Foo(1);

        expectFail(Assertion.EQ, f1, f2);

        expectFail(Assertion.LTE, null, 2);

        expectFail(Assertion.LTE, 2, null);

    }

    private static void testGreaterThanOrEqual() throws Exception {

        expectPass(Assertion.GTE, 1, 1);

        expectPass(Assertion.GTE, 2, 1);

        expectFail(Assertion.GTE, 1, 2);

        expectFail(Assertion.GTE, null, 2);

        expectFail(Assertion.GTE, 2, null);

    }

    private static void testGreaterThan() throws Exception {

        expectPass(Assertion.GT, 2, 1);

        expectFail(Assertion.GT, 1, 1);

        expectFail(Assertion.GT, 1, 2);

        expectFail(Assertion.GT, null, 2);

        expectFail(Assertion.GT, 2, null);

    }

    private static void testNotEquals() throws Exception {

        expectPass(Assertion.NE, null, 1);

        expectPass(Assertion.NE, 1, null);

        Foo f1 = new Foo(1);

        Foo f2 = new Foo(1);

        expectPass(Assertion.NE, f1, f2);

        expectFail(Assertion.NE, (Comparable)null, (Comparable)null);

        expectFail(Assertion.NE, f1, f1);

        expectFail(Assertion.NE, 1, 1);

    }

    private static void testNull() throws Exception {

        expectPass(Assertion.NULL, (Comparable)null);

        expectFail(Assertion.NULL, 1);

    }

    private static void testNotNull() throws Exception {

        expectPass(Assertion.NOTNULL, 1);

        expectFail(Assertion.NOTNULL, (Comparable)null);

    }

    private static void testTrue() throws Exception {

        expectPass(Assertion.TRUE, true);

        expectFail(Assertion.TRUE, false);

    }

    private static void testFalse() throws Exception {

        expectPass(Assertion.FALSE, false);

        expectFail(Assertion.FALSE, true);

    }

    private static void testFail() throws Exception {

        try {

            fail();

        } catch (RuntimeException re) {

            assertEquals("fail", re.getMessage());

        }

        try {

            fail("Failure");

        } catch (RuntimeException re) {

            assertEquals("Failure", re.getMessage());

        }

        Exception e = new Exception("the cause");

        try {

            fail("Fail w/ cause", e);

        } catch (RuntimeException re) {

            assertEquals("Fail w/ cause", re.getMessage());

            assertEquals(e, re.getCause(), "Cause mismatch");

        }

        try {

            fail(1, 2, "Different", "vs");

        } catch (RuntimeException re) {

            assertEquals("Different <1> vs <2>", re.getMessage());

        }

    }

    private static <T extends Comparable<T>> void expectPass(Assertion assertion, T ... args)

        throws Exception {

        Assertion.run(assertion, args);

    }

    private static <T extends Comparable<T>> void expectFail(Assertion assertion, T ... args)

        throws Exception {

        try {

            Assertion.run(assertion, args);

        } catch (RuntimeException e) {

            return;

        }

        throw new Exception("Expected " + Assertion.format(assertion, (Object[]) args) +

                            " to throw a RuntimeException");

    }

}

enum Assertion {

    LT, LTE, EQ, GTE, GT, NE, NULL, NOTNULL, FALSE, TRUE;

    public static <T extends Comparable<T>> void run(Assertion assertion, T ... args) {

        String msg = "Expected " + format(assertion, args) + " to pass";

        switch (assertion) {

            case LT:

                assertLessThan(args[0], args[1], msg);

                break;

            case LTE:

                assertLessThanOrEqual(args[0], args[1], msg);

                break;

            case EQ:

                assertEquals(args[0], args[1], msg);

                break;

            case GTE:

                assertGreaterThanOrEqual(args[0], args[1], msg);

                break;

            case GT:

                assertGreaterThan(args[0], args[1], msg);

                break;

            case NE:

                assertNotEquals(args[0], args[1], msg);

                break;

            case NULL:

                assertNull(args == null ? args : args[0], msg);

                break;

            case NOTNULL:

                assertNotNull(args == null ? args : args[0], msg);

                break;

            case FALSE:

                assertFalse((Boolean) args[0], msg);

                break;

            case TRUE:

                assertTrue((Boolean) args[0], msg);

                break;

            default:

                // do nothing

        }

    }

    public static String format(Assertion assertion, Object ... args) {

        switch (assertion) {

            case LT:

                return asString("assertLessThan", args);

            case LTE:

                return asString("assertLessThanOrEqual", args);

            case EQ:

                return asString("assertEquals", args);

            case GTE:

                return asString("assertGreaterThanOrEquals", args);

            case GT:

                return asString("assertGreaterThan", args);

            case NE:

                return asString("assertNotEquals", args);

            case NULL:

                return asString("assertNull", args);

            case NOTNULL:

                return asString("assertNotNull", args);

            case FALSE:

                return asString("assertFalse", args);

            case TRUE:

                return asString("assertTrue", args);

            default:

                return "";

        }

    }

    private static String asString(String assertion, Object ... args) {

        if (args == null) {

            return String.format("%s(null)", assertion);

        }

        if (args.length == 1) {

            return String.format("%s(%s)", assertion, args[0]);

        } else {

            return String.format("%s(%s, %s)", assertion, args[0], args[1]);

        }

    }

}