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/**

 * @test

 * @bug 8017231 8020977 8054221

 * @summary test  StringJoiner::merge

 * @run testng MergeTest

 */

import java.util.StringJoiner;

import java.util.stream.Stream;

import org.testng.annotations.Test;

import static org.testng.Assert.assertEquals;

import static org.testng.Assert.fail;

@Test

public class MergeTest {

    private static class Fixes {

        public String pre0, suf0;

        public String pre1, suf1;

        public Fixes(String prefix0, String suffix0,

                     String prefix1, String suffix1) {

            this.pre0 = prefix0;

            this.suf0 = suffix0;

            this.pre1 = prefix1;

            this.suf1 = suffix1;

        }

    }

    private static Stream<Fixes> fixesStream() {

        Stream.Builder<Fixes> builder = Stream.builder();

        for (final String prefix0 : PREFIXES) {

            for (final String suffix0 : SUFFIXES) {

                for (final String prefix1 : PREFIXES) {

                    for (final String suffix1 : SUFFIXES) {

                        builder.accept(new Fixes(prefix0, suffix0,

                                                 prefix1, suffix1));

                    }

                }

            }

        }

        return builder.build();

    }

    @Test(expectedExceptions = {NullPointerException.class})

    public void testNull() {

        StringJoiner sj = new StringJoiner(",", "{", "}");

        sj.merge(null);

    }

    public void testSimple() {

        fixesStream().forEach(fixes -> {

            StringJoiner sj = new StringJoiner(",", fixes.pre0, fixes.suf0);

            StringJoiner other = new StringJoiner(",", fixes.pre1, fixes.suf1);

            Stream.of("a", "b", "c").forEachOrdered(sj::add);

            Stream.of("d", "e", "f").forEachOrdered(other::add);

            sj.merge(other);

            assertEquals(sj.toString(), fixes.pre0 + "a,b,c,d,e,f" + fixes.suf0);

        });

    }

    public void testEmptyOther() {

        fixesStream().forEach(fixes -> {

            StringJoiner sj = new StringJoiner(",", fixes.pre0, fixes.suf0);

            StringJoiner other = new StringJoiner(",", fixes.pre1, fixes.suf1);

            Stream.of("a", "b", "c").forEachOrdered(sj::add);

            sj.merge(other);

            assertEquals(sj.toString(), fixes.pre0 + "a,b,c" + fixes.suf0);

            other.setEmptyValue("EMPTY");

            sj.merge(other);

            assertEquals(sj.toString(), fixes.pre0 + "a,b,c" + fixes.suf0);

        });

    }

    public void testEmptyThis() {

        fixesStream().forEach(fixes -> {

            StringJoiner sj = new StringJoiner(",", fixes.pre0, fixes.suf0);

            StringJoiner other = new StringJoiner(":", fixes.pre1, fixes.suf1);

            Stream.of("d", "e", "f").forEachOrdered(other::add);

            sj.merge(other);

            assertEquals(sj.toString(), fixes.pre0 + "d:e:f" + fixes.suf0);

            sj = new StringJoiner(",", fixes.pre0, fixes.suf0).setEmptyValue("EMPTY");

            assertEquals(sj.toString(), "EMPTY");

            sj.merge(other);

            assertEquals(sj.toString(), fixes.pre0 + "d:e:f" + fixes.suf0);

        });

    }

    public void testEmptyBoth() {

        fixesStream().forEach(fixes -> {

            StringJoiner sj = new StringJoiner(",", fixes.pre0, fixes.suf0);

            StringJoiner other = new StringJoiner(":", fixes.pre1, fixes.suf1);

            sj.merge(other);

            assertEquals(sj.toString(), fixes.pre0 + fixes.suf0);

            other.setEmptyValue("NOTHING");

            sj.merge(other);

            assertEquals(sj.toString(), fixes.pre0 + fixes.suf0);

            sj = new StringJoiner(",", fixes.pre0, fixes.suf0).setEmptyValue("EMPTY");

            assertEquals(sj.toString(), "EMPTY");

            sj.merge(other);

            assertEquals(sj.toString(), "EMPTY");

        });

    }

    public void testCascadeEmpty() {

        fixesStream().forEach(fixes -> {

            StringJoiner sj = new StringJoiner(",", fixes.pre0, fixes.suf0);

            StringJoiner o1 = new StringJoiner(":", fixes.pre1, fixes.suf1).setEmptyValue("Empty1");

            StringJoiner o2 = new StringJoiner(",", "<", ">").setEmptyValue("Empty2");

            o1.merge(o2);

            assertEquals(o1.toString(), "Empty1");

            sj.merge(o1);

            assertEquals(sj.toString(), fixes.pre0 + fixes.suf0);

        });

    }

    public void testDelimiter() {

        fixesStream().forEach(fixes -> {

            StringJoiner sj = new StringJoiner(",", fixes.pre0, fixes.suf0);

            StringJoiner other = new StringJoiner(":", fixes.pre1, fixes.suf1);

            Stream.of("a", "b", "c").forEachOrdered(sj::add);

            Stream.of("d", "e", "f").forEachOrdered(other::add);

            sj.merge(other);

            assertEquals(sj.toString(), fixes.pre0 + "a,b,c,d:e:f" + fixes.suf0);

        });

    }

    public void testMergeSelf() {

        fixesStream().forEach(fixes -> {

            final StringJoiner sj = new StringJoiner(",", fixes.pre0, fixes.suf0).add("a").add("b");

            assertEquals(sj.merge(sj).toString(), fixes.pre0 + "a,b,a,b" + fixes.suf0);

            assertEquals(sj.merge(sj).toString(), fixes.pre0 + "a,b,a,b,a,b,a,b" + fixes.suf0);

        });

    }

}