// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.tools;

import static org.junit.Assert.assertEquals;

import java.io.BufferedReader;
import java.io.IOException;
import java.net.URL;
import java.util.Arrays;
import java.util.Locale;

import org.junit.Assert;
import org.junit.Test;
import org.openstreetmap.josm.Main;

/**
 * Unit tests of {@link Utils} class.
 */
public class UtilsTest {

    /**
     * Test of {@link Utils#strip} method.
     */
    @Test
    public void testStrip() {
        final String someWhite =
            "\u00A0"+ // SPACE_SEPARATOR
            "\u2007"+ // LINE_SEPARATOR
            "\u202F"+ // PARAGRAPH_SEPARATOR
            "\u0009"+ // HORIZONTAL TABULATION
            "\n"    + // LINE FEED (U+000A, cannot be put as it in Java)
            "\u000B"+ // VERTICAL TABULATION
            "\u000C"+ // FORM FEED
            "\r"    + // CARRIAGE RETURN (U+000D, cannot be put as it in Java)
            "\u001C"+ // FILE SEPARATOR
            "\u001D"+ // GROUP SEPARATOR
            "\u001E"+ // RECORD SEPARATOR
            "\u001F"+ // UNIT SEPARATOR
            "\u2003"+ // EM SPACE
            "\u2007"+ // FIGURE SPACE
            "\u200B"+ // ZERO WIDTH SPACE
            "\uFEFF"+ // ZERO WIDTH NO-BREAK SPACE
            "\u3000"; // IDEOGRAPHIC SPACE
        Assert.assertNull(Utils.strip(null));
        Assert.assertEquals("", Utils.strip(""));
        Assert.assertEquals("", Utils.strip(" "));
        Assert.assertEquals("", Utils.strip("  "));
        Assert.assertEquals("", Utils.strip("   "));
        Assert.assertEquals("", Utils.strip(someWhite));
        Assert.assertEquals("a", Utils.strip("a"));
        Assert.assertEquals("ab", Utils.strip("ab"));
        Assert.assertEquals("abc", Utils.strip("abc"));
        Assert.assertEquals("a", Utils.strip(" a"));
        Assert.assertEquals("ab", Utils.strip(" ab"));
        Assert.assertEquals("abc", Utils.strip(" abc"));
        Assert.assertEquals("a", Utils.strip("a "));
        Assert.assertEquals("ab", Utils.strip("ab "));
        Assert.assertEquals("abc", Utils.strip("abc "));
        Assert.assertEquals("a", Utils.strip(someWhite+"a"+someWhite));
        Assert.assertEquals("ab", Utils.strip(someWhite+"ab"+someWhite));
        Assert.assertEquals("abc", Utils.strip(someWhite+"abc"+someWhite));

        // extended skip
        Assert.assertEquals("a", Utils.strip("a", "b"));
        Assert.assertEquals("b", Utils.strip("acbcac", "ac"));
    }

    /**
     * Test of {@link Utils#toHexString} method.
     */
    @Test
    public void testToHexString() {
        Assert.assertEquals("", Utils.toHexString(null));
        Assert.assertEquals("", Utils.toHexString(new byte[0]));
        Assert.assertEquals("01", Utils.toHexString(new byte[]{0x1}));
        Assert.assertEquals("0102", Utils.toHexString(new byte[]{0x1, 0x2}));
        Assert.assertEquals("12", Utils.toHexString(new byte[]{0x12}));
        Assert.assertEquals("127f", Utils.toHexString(new byte[]{0x12, 0x7f}));
        Assert.assertEquals("fedc", Utils.toHexString(new byte[]{(byte) 0xfe, (byte) 0xdc}));
    }

    /**
     * Test of {@link Utils#openURLReaderAndDecompress} method with Gzip compression.
     * @throws IOException if any I/O error occurs
     */
    @Test
    public void testOpenUrlGzip() throws IOException {
        Main.initApplicationPreferences();
        final URL url = new URL("https://www.openstreetmap.org/trace/1613906/data");
        try (BufferedReader x = HttpClient.create(url).connect().uncompress(true).getContentReader()) {
            Assert.assertTrue(x.readLine().startsWith("<?xml version="));
        }
    }

    /**
     * Test of {@link Utils#openURLReaderAndDecompress} method with Bzip compression.
     * @throws IOException if any I/O error occurs
     */
    @Test
    public void testOpenUrlBzip() throws IOException {
        Main.initApplicationPreferences();
        final URL url = new URL("https://www.openstreetmap.org/trace/785544/data");
        try (BufferedReader x = HttpClient.create(url).connect().uncompress(true).getContentReader()) {
            Assert.assertTrue(x.readLine().startsWith("<?xml version="));
        }
    }

    /**
     * Test of {@link Utils#openURLReaderAndDecompress} method with Bzip compression.
     * @throws IOException if any I/O error occurs
     */
    @Test
    public void testTicket9660() throws IOException {
        Main.initApplicationPreferences();
        final URL url = new URL("http://www.openstreetmap.org/trace/1350010/data");
        try (BufferedReader x = HttpClient.create(url).connect()
                .uncompress(true).uncompressAccordingToContentDisposition(true).getContentReader()) {
            Assert.assertTrue(x.readLine().startsWith("<?xml version="));
        }
    }

    /**
     * Test of {@link Utils#getPositionListString} method.
     */
    @Test
    public void testPositionListString() {
        assertEquals("1", Utils.getPositionListString(Arrays.asList(1)));
        assertEquals("1-3", Utils.getPositionListString(Arrays.asList(1, 2, 3)));
        assertEquals("1-3", Utils.getPositionListString(Arrays.asList(3, 1, 2)));
        assertEquals("1-3,6-8", Utils.getPositionListString(Arrays.asList(1, 2, 3, 6, 7, 8)));
        assertEquals("1-2,5-7", Utils.getPositionListString(Arrays.asList(1, 5, 2, 6, 7)));
    }

    /**
     * Test of {@link Utils#getDurationString} method.
     */
    @Test
    public void testDurationString() {
        I18n.set("en");
        assertEquals("123 ms", Utils.getDurationString(123));
        assertEquals("1.2 s", Utils.getDurationString(1234));
        assertEquals("57.0 s", Utils.getDurationString(57 * 1000));
        assertEquals("8 min 27 s", Utils.getDurationString(507 * 1000));
        assertEquals("8 h 24 min", Utils.getDurationString((long) (8.4 * 60 * 60 * 1000)));
        assertEquals("1 day 12 h", Utils.getDurationString((long) (1.5 * 24 * 60 * 60 * 1000)));
        assertEquals("8 days 12 h", Utils.getDurationString((long) (8.5 * 24 * 60 * 60 * 1000)));
    }

    /**
     * Test of {@link Utils#escapeReservedCharactersHTML} method.
     */
    @Test
    public void testEscapeReservedCharactersHTML() {
        assertEquals("foo -&gt; bar -&gt; '&amp;'", Utils.escapeReservedCharactersHTML("foo -> bar -> '&'"));
    }

    /**
     * Test of {@link Utils#restrictStringLines} method.
     */
    @Test
    public void testRestrictStringLines() {
        assertEquals("1\n...", Utils.restrictStringLines("1\n2\n3", 2));
        assertEquals("1\n2\n3", Utils.restrictStringLines("1\n2\n3", 3));
        assertEquals("1\n2\n3", Utils.restrictStringLines("1\n2\n3", 4));
    }

    /**
     * Test of {@link Utils#getSizeString} method.
     */
    @Test
    public void testSizeString() throws Exception {
        assertEquals("0 B", Utils.getSizeString(0, Locale.ENGLISH));
        assertEquals("123 B", Utils.getSizeString(123, Locale.ENGLISH));
        assertEquals("1023 B", Utils.getSizeString(1023, Locale.ENGLISH));
        assertEquals("1.00 kB", Utils.getSizeString(1024, Locale.ENGLISH));
        assertEquals("11.7 kB", Utils.getSizeString(12024, Locale.ENGLISH));
        assertEquals("8.00 EB", Utils.getSizeString(Long.MAX_VALUE, Locale.ENGLISH));
    }

    /**
     * Test of {@link Utils#getSizeString} method.
     */
    @Test(expected = IllegalArgumentException.class)
    public void testSizeStringNegative() throws Exception {
        Utils.getSizeString(-1, Locale.ENGLISH);
    }

}