/**
 * Copyright 2012-2014 Julien Eluard and contributors
 * This project includes software developed by Julien Eluard: https://github.com/jeluard/
 *
 * 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 org.semver;

import java.util.ArrayList;
import java.util.List;

import org.junit.Assert;
import org.junit.Test;

public class VersionTest {

    @Test
    public void shouldNegativVersionBeRejected() {
        try {
            new Version(-1, 0, 0);
            Assert.fail();
        } catch (IllegalArgumentException e) {
        }
        try {
            new Version(0, -1, 0);
            Assert.fail();
        } catch (IllegalArgumentException e) {
        }
        try {
            new Version(0, 0, -1);
            Assert.fail();
        } catch (IllegalArgumentException e) {
        }
    }

    @Test
    public void shouldValidVersionBeParsed() {
        Version.parse("1.2");
        Version.parse("1.2.3");
        Version.parse("10.20.30");
        Version.parse("1.2.3beta");
        Version.parse("1.2.3.DEV");
        Version.parse("1.2.3.DEV-SNAPSHOT");
        Version.parse("1.2-SNAPSHOT");
        Version.parse("1.2.3-SNAPSHOT");
        Version.parse("1.2.3-RC-SNAPSHOT");
        Version.parse("1.2-RC-SNAPSHOT");
    }



    @Test(expected=IllegalArgumentException.class)
    public void shouldInvalidVersion1NotBeParsed() {
        Version.parse("invalid");
    }

    @Test(expected=IllegalArgumentException.class)
    public void shouldInvalidVersion2NotBeParsed() {
        Version.parse("a.2.3");
    }

    @Test
    public void shouldMajorBeCorrectlyIncremented() {
        Assert.assertEquals(Version.parse("10.0.0"), Version.parse("9.0.0").next(Version.Element.MAJOR));
    }

    @Test
    public void shouldMinorBeCorrectlyIncremented() {
        Assert.assertEquals(Version.parse("0.10.0"), Version.parse("0.9.0").next(Version.Element.MINOR));
    }

    @Test
    public void shouldPatchBeCorrectlyIncremented() {
        Assert.assertEquals(Version.parse("0.0.10"), Version.parse("0.0.9").next(Version.Element.PATCH));
    }

    @Test
    public void shouldDevelopmentBeInDevelopment() {
        Assert.assertTrue(Version.parse("0.1.1").isInDevelopment());
        Assert.assertFalse(Version.parse("1.1.1").isInDevelopment());
    }

    @Test
    public void shouldStableVersionBeStable() {
        Assert.assertTrue(Version.parse("1.1.1").isStable());
        Assert.assertFalse(Version.parse("0.1.1").isStable());
    }

    @Test
    public void isNewer() {
    	  Assert.assertTrue(Version.parse("3.2.3").compareTo(Version.parse("3.2-M1-SNAPSHOT")) > 0);
        Assert.assertTrue(Version.parse("1.0.0").compareTo(Version.parse("0.0.0")) > 0);
        Assert.assertTrue(Version.parse("0.0.0").compareTo(Version.parse("1.0.0")) < 0);
        Assert.assertTrue(Version.parse("1.1.0").compareTo(Version.parse("1.0.0")) > 0);
        Assert.assertTrue(Version.parse("1.0.0").compareTo(Version.parse("1.1.0")) < 0);
        Assert.assertTrue(Version.parse("1.0.1").compareTo(Version.parse("1.0.0")) > 0);
        Assert.assertTrue(Version.parse("1.0.0").compareTo(Version.parse("1.0.1")) < 0);
        Assert.assertTrue(Version.parse("1.0.0Beta").compareTo(Version.parse("1.0.0Alpha")) > 0);
        Assert.assertFalse(Version.parse("0.0.0").compareTo(Version.parse("0.0.0")) > 0);
        Assert.assertFalse(Version.parse("0.0.0").compareTo(Version.parse("0.0.1")) > 0);
        // based on http://semver.org/
        //  Example: 1.0.0-alpha < 1.0.0-alpha.1 < 1.0.0-alpha.beta < 1.0.0-beta < 1.0.0-beta.2 < 1.0.0-beta.11 < 1.0.0-rc.1 < 1.0.0.
        String[] versions = { "1.0.0-alpha", "1.0.0-alpha.1", "1.0.0-alpha.beta", "1.0.0-beta", "1.0.0-beta.2", "1.0.0-beta.11", "1.0.0-rc.1", "1.0.0" };
        assertTotalOrder(versions);
    }

    private void assertTotalOrder(String[] versions) {
      List<String> problems = new ArrayList<String>();
      for (int i = 0; i < versions.length - 1; i++) {
        Version v1 = Version.parse(versions[i]);
        for (int j = (i + 1); j < versions.length; j++) {
          Version v2 = Version.parse(versions[j]);
          int compare = v1.compareTo(v2);
          if (compare >= 0 ) {
            problems.add(v1 + ( compare == 0 ? " = " : " > ") + v2);
          }
        }
      }
      if (problems.size() > 0) {
        Assert.fail("incorrect comparisons: " + problems);
      }
    }

    @Test
    public void next() {
        final int major = 1;
        final int minor = 2;
        final int patch = 3;
        final Version version = new Version(major, minor, patch);

        Assert.assertEquals(version.next(Version.Element.MAJOR), new Version(major+1, 0, 0));
        Assert.assertEquals(version.next(Version.Element.MINOR), new Version(major, minor+1, 0));
        Assert.assertEquals(version.next(Version.Element.PATCH), new Version(major, minor, patch+1));
    }

    @Test
    public void nextFromPre() {
        final Version version1 = new Version(1, 0, 0, "-", "rc1");
        Assert.assertEquals(new Version(1, 0, 0), version1.next(Version.Element.MAJOR));
        Assert.assertEquals(new Version(1, 0, 0), version1.next(Version.Element.MINOR));
        Assert.assertEquals(new Version(1, 0, 0), version1.next(Version.Element.PATCH));

        final Version version2 = new Version(1, 1, 0, "-", "rc1");
        Assert.assertEquals(new Version(2, 0, 0), version2.next(Version.Element.MAJOR));
        Assert.assertEquals(new Version(1, 1, 0), version2.next(Version.Element.MINOR));
        Assert.assertEquals(new Version(1, 1, 0), version2.next(Version.Element.PATCH));

        final Version version3 = new Version(1, 1, 1, "-", "rc1");
        Assert.assertEquals(new Version(2, 0, 0), version3.next(Version.Element.MAJOR));
        Assert.assertEquals(new Version(1, 2, 0), version3.next(Version.Element.MINOR));
        Assert.assertEquals(new Version(1, 1, 1), version3.next(Version.Element.PATCH));
    }


    @Test(expected=IllegalArgumentException.class)
    public void shouldNextWithNullComparisonTypeFail() {
        final int major = 1;
        final int minor = 2;
        final int patch = 3;
        final Version version = new Version(major, minor, patch);

        version.next(null);
    }

}