/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.tika.metadata;

//JDK imports

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Properties;
import java.util.Random;
import java.util.TimeZone;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

import org.apache.tika.utils.DateUtils;
import org.junit.Test;

//Junit imports

/**
 * JUnit based tests of class {@link org.apache.tika.metadata.Metadata}.
 */
public class TestMetadata {

    private static final String CONTENTTYPE = "contenttype";

    /** Test for the <code>add(String, String)</code> method. */
    @Test
    public void testAdd() {
        String[] values = null;
        Metadata meta = new Metadata();

        values = meta.getValues(CONTENTTYPE);
        assertEquals(0, values.length);

        meta.add(CONTENTTYPE, "value1");
        values = meta.getValues(CONTENTTYPE);
        assertEquals(1, values.length);
        assertEquals("value1", values[0]);

        meta.add(CONTENTTYPE, "value2");
        values = meta.getValues(CONTENTTYPE);
        assertEquals(2, values.length);
        assertEquals("value1", values[0]);
        assertEquals("value2", values[1]);

        // NOTE : For now, the same value can be added many times.
        // Should it be changed?
        meta.add(CONTENTTYPE, "value1");
        values = meta.getValues(CONTENTTYPE);
        assertEquals(3, values.length);
        assertEquals("value1", values[0]);
        assertEquals("value2", values[1]);
        assertEquals("value1", values[2]);
        
        Property nonMultiValued = Property.internalText("nonMultiValued");
        meta.add(nonMultiValued, "value1");
        try {
            meta.add(nonMultiValued, "value2");
            fail("add should fail on the second call of a non-multi valued item");
        } catch (PropertyTypeException e) {
        }
    }

    /** Test for the <code>set(String, String)</code> method. */
    @Test
    public void testSet() {
        String[] values = null;
        Metadata meta = new Metadata();

        values = meta.getValues(CONTENTTYPE);
        assertEquals(0, values.length);

        meta.set(CONTENTTYPE, "value1");
        values = meta.getValues(CONTENTTYPE);
        assertEquals(1, values.length);
        assertEquals("value1", values[0]);

        meta.set(CONTENTTYPE, "value2");
        values = meta.getValues(CONTENTTYPE);
        assertEquals(1, values.length);
        assertEquals("value2", values[0]);

        meta.set(CONTENTTYPE, "new value 1");
        meta.add("contenttype", "new value 2");
        values = meta.getValues(CONTENTTYPE);
        assertEquals(2, values.length);
        assertEquals("new value 1", values[0]);
        assertEquals("new value 2", values[1]);
    }

    /** Test for <code>setAll(Properties)</code> method. */
    @Test
    public void testSetProperties() {
        String[] values = null;
        Metadata meta = new Metadata();
        Properties props = new Properties();

        meta.setAll(props);
        assertEquals(0, meta.size());

        props.setProperty("name-one", "value1.1");
        meta.setAll(props);
        assertEquals(1, meta.size());
        values = meta.getValues("name-one");
        assertEquals(1, values.length);
        assertEquals("value1.1", values[0]);

        props.setProperty("name-two", "value2.1");
        meta.setAll(props);
        assertEquals(2, meta.size());
        values = meta.getValues("name-one");
        assertEquals(1, values.length);
        assertEquals("value1.1", values[0]);
        values = meta.getValues("name-two");
        assertEquals(1, values.length);
        assertEquals("value2.1", values[0]);
    }

    /** Test for <code>get(String)</code> method. */
    @Test
    public void testGet() {
        Metadata meta = new Metadata();
        assertNull(meta.get("a-name"));
        meta.add("a-name", "value-1");
        assertEquals("value-1", meta.get("a-name"));
        meta.add("a-name", "value-2");
        assertEquals("value-1", meta.get("a-name"));
    }

    /** Test for <code>isMultiValued()</code> method. */
    @Test
    public void testIsMultiValued() {
        Metadata meta = new Metadata();
        assertFalse(meta.isMultiValued("key"));
        meta.add("key", "value1");
        assertFalse(meta.isMultiValued("key"));
        meta.add("key", "value2");
        assertTrue(meta.isMultiValued("key"));
    }

    /** Test for <code>names</code> method. */
    @Test
    public void testNames() {
        String[] names = null;
        Metadata meta = new Metadata();
        names = meta.names();
        assertEquals(0, names.length);

        meta.add("name-one", "value");
        names = meta.names();
        assertEquals(1, names.length);
        assertEquals("name-one", names[0]);
        meta.add("name-two", "value");
        names = meta.names();
        assertEquals(2, names.length);
    }

    /** Test for <code>remove(String)</code> method. */
    @Test
    public void testRemove() {
        Metadata meta = new Metadata();
        meta.remove("name-one");
        assertEquals(0, meta.size());
        meta.add("name-one", "value-1.1");
        meta.add("name-one", "value-1.2");
        meta.add("name-two", "value-2.2");
        assertEquals(2, meta.size());
        assertNotNull(meta.get("name-one"));
        assertNotNull(meta.get("name-two"));
        meta.remove("name-one");
        assertEquals(1, meta.size());
        assertNull(meta.get("name-one"));
        assertNotNull(meta.get("name-two"));
        meta.remove("name-two");
        assertEquals(0, meta.size());
        assertNull(meta.get("name-one"));
        assertNull(meta.get("name-two"));
    }

    /** Test for <code>equals(Object)</code> method. */
    @Test
    public void testObject() {
        Metadata meta1 = new Metadata();
        Metadata meta2 = new Metadata();
        assertFalse(meta1.equals(null));
        assertFalse(meta1.equals("String"));
        assertTrue(meta1.equals(meta2));
        meta1.add("name-one", "value-1.1");
        assertFalse(meta1.equals(meta2));
        meta2.add("name-one", "value-1.1");
        assertTrue(meta1.equals(meta2));
        meta1.add("name-one", "value-1.2");
        assertFalse(meta1.equals(meta2));
        meta2.add("name-one", "value-1.2");
        assertTrue(meta1.equals(meta2));
        meta1.add("name-two", "value-2.1");
        assertFalse(meta1.equals(meta2));
        meta2.add("name-two", "value-2.1");
        assertTrue(meta1.equals(meta2));
        meta1.add("name-two", "value-2.2");
        assertFalse(meta1.equals(meta2));
        meta2.add("name-two", "value-2.x");
        assertFalse(meta1.equals(meta2));
    }

    /**
     * Tests for getting and setting integer
     *  based properties
     */
    @Test
    public void testGetSetInt() {
        Metadata meta = new Metadata();
        
        // Isn't initially set, will get null back
        assertEquals(null, meta.get(Metadata.IMAGE_WIDTH));
        assertEquals(null, meta.getInt(Metadata.IMAGE_WIDTH));
        
        // Can only set as a single valued int
        try {
            meta.set(Metadata.BITS_PER_SAMPLE, 1);
            fail("Shouldn't be able to set a multi valued property as an int");
        } catch(PropertyTypeException e) {}
        try {
            meta.set(TikaCoreProperties.CREATED, 1);
            fail("Shouldn't be able to set a date property as an int");
        } catch(PropertyTypeException e) {}
        
        // Can set it and retrieve it
        meta.set(Metadata.IMAGE_WIDTH, 22);
        assertEquals("22", meta.get(Metadata.IMAGE_WIDTH));
        assertEquals(22, meta.getInt(Metadata.IMAGE_WIDTH).intValue());
        
        // If you save a non int value, you get null
        meta.set(Metadata.IMAGE_WIDTH, "INVALID");
        assertEquals("INVALID", meta.get(Metadata.IMAGE_WIDTH));
        assertEquals(null, meta.getInt(Metadata.IMAGE_WIDTH));
        
        // If you try to retrieve a non simple int value, you get null
        meta.set(Metadata.IMAGE_WIDTH, 22);
        assertEquals(22, meta.getInt(Metadata.IMAGE_WIDTH).intValue());
        assertEquals(null, meta.getInt(Metadata.BITS_PER_SAMPLE));
        assertEquals(null, meta.getInt(TikaCoreProperties.CREATED));
    }
    
    /**
     * Tests for getting and setting date
     *  based properties
     */
    @Test
    public void testGetSetDate() {
        Metadata meta = new Metadata();
        long hour = 60 * 60 * 1000; 
        
        // Isn't initially set, will get null back
        assertEquals(null, meta.get(TikaCoreProperties.CREATED));
        assertEquals(null, meta.getInt(TikaCoreProperties.CREATED));
        
        // Can only set as a single valued date
        try {
            meta.set(Metadata.BITS_PER_SAMPLE, new Date(1000));
            fail("Shouldn't be able to set a multi valued property as a date");
        } catch(PropertyTypeException e) {}
        try {
            meta.set(Metadata.IMAGE_WIDTH, new Date(1000));
            fail("Shouldn't be able to set an int property as an date");
        } catch(PropertyTypeException e) {}
        
        // Can set it and retrieve it
        meta.set(TikaCoreProperties.CREATED, new Date(1000));
        assertEquals("1970-01-01T00:00:01Z", meta.get(TikaCoreProperties.CREATED));
        assertEquals(1000, meta.getDate(TikaCoreProperties.CREATED).getTime());
        
        // If you save a non date value, you get null
        meta.set(TikaCoreProperties.CREATED, "INVALID");
        assertEquals("INVALID", meta.get(TikaCoreProperties.CREATED));
        assertEquals(null, meta.getDate(TikaCoreProperties.CREATED));
        
        // If you try to retrieve a non simple date value, you get null
        meta.set(TikaCoreProperties.CREATED, new Date(1000));
        assertEquals(1000, meta.getDate(TikaCoreProperties.CREATED).getTime());
        assertEquals(null, meta.getInt(Metadata.BITS_PER_SAMPLE));
        assertEquals(null, meta.getInt(TikaCoreProperties.CREATED));
        
        // Our format doesn't include milliseconds
        // This means things get rounded 
        meta.set(TikaCoreProperties.CREATED, new Date(1050));
        assertEquals("1970-01-01T00:00:01Z", meta.get(TikaCoreProperties.CREATED));
        assertEquals(1000, meta.getDate(TikaCoreProperties.CREATED).getTime());
        
        // We can accept a number of different ISO-8601 variants
        meta.set(TikaCoreProperties.CREATED, "1970-01-01T00:00:01Z");
        assertEquals(1000, meta.getDate(TikaCoreProperties.CREATED).getTime());
        
        meta.set(TikaCoreProperties.CREATED, "1970-01-01 00:00:01Z");
        assertEquals(1000, meta.getDate(TikaCoreProperties.CREATED).getTime());
        
        meta.set(TikaCoreProperties.CREATED, "1970-01-01T01:00:01+01:00");
        assertEquals(1000, meta.getDate(TikaCoreProperties.CREATED).getTime());
        
        meta.set(TikaCoreProperties.CREATED, "1970-01-01 01:00:01+01:00");
        assertEquals(1000, meta.getDate(TikaCoreProperties.CREATED).getTime());
        
        meta.set(TikaCoreProperties.CREATED, "1970-01-01T12:00:01+12:00");
        assertEquals(1000, meta.getDate(TikaCoreProperties.CREATED).getTime());
        
        meta.set(TikaCoreProperties.CREATED, "1969-12-31T12:00:01-12:00");
        assertEquals(1000, meta.getDate(TikaCoreProperties.CREATED).getTime());
        
        // Dates without times, come in at midday UTC
        meta.set(TikaCoreProperties.CREATED, "1970-01-01");
        assertEquals(12*hour, meta.getDate(TikaCoreProperties.CREATED).getTime());
        
        meta.set(TikaCoreProperties.CREATED, "1970:01:01");
        assertEquals(12*hour, meta.getDate(TikaCoreProperties.CREATED).getTime());
    }
    
    /**
     * Some documents, like jpegs, might have date in unspecified time zone
     * which should be handled like strings but verified to have parseable ISO 8601 format
     */
    @Test
    public void testGetSetDateUnspecifiedTimezone() {
        Metadata meta = new Metadata();    
        
        // Set explictly without a timezone
        meta.set(TikaCoreProperties.CREATED, "1970-01-01T00:00:01");
        assertEquals("should return string without time zone specifier because zone is not known",
        		"1970-01-01T00:00:01", meta.get(TikaCoreProperties.CREATED));
        
        // Now ask DateUtils to format for us without one
        meta.set(TikaCoreProperties.CREATED, DateUtils.formatDateUnknownTimezone(new Date(1000)));
        assertEquals("should return string without time zone specifier because zone is not known",
                         "1970-01-01T00:00:01", meta.get(TikaCoreProperties.CREATED));
    }
    
    /**
     * Defines a composite property, then checks that when set as the
     *  composite the value can be retrieved with the property or the aliases
     */
    @SuppressWarnings("deprecation")
    @Test
    public void testCompositeProperty() {
       Metadata meta = new Metadata();
       Property compositeProperty = Property.composite(
             DublinCore.DESCRIPTION, new Property[] { 
                   Property.internalText(Metadata.DESCRIPTION),
                   Property.internalText("testDescriptionAlt")
             });
       String message = "composite description";
       meta.set(compositeProperty, message);

       // Fetch as the composite
       assertEquals(message, meta.get(compositeProperty));
       // Fetch as the primary property on the composite
       assertEquals(message, meta.get(DublinCore.DESCRIPTION));
       // Fetch as the aliases
       assertEquals(message, meta.get(Metadata.DESCRIPTION));
       assertEquals(message, meta.get("testDescriptionAlt"));
    }

    @Test
    public void testMultithreadedDates() throws Exception {
        int numThreads = 10;
        ExecutorService executorService = Executors.newFixedThreadPool(numThreads);
        ExecutorCompletionService<Integer> executorCompletionService = new ExecutorCompletionService<Integer>(executorService);
        for (int i = 0; i < numThreads; i++) {
            executorCompletionService.submit(new MetadataDateAdder());
        }
        int finished = 0;
        while (finished < numThreads) {
            Future<Integer> future = executorCompletionService.take();
            if (future != null && future.isDone()) {
                Integer retVal = future.get();
                finished++;
            }
        }

    }

    private class MetadataDateAdder implements Callable<Integer> {
        private final Random random = new Random();
        @Override
        public Integer call() throws Exception {
            for (int i = 0; i < 1000; i++) {
                Metadata m = new Metadata();
                long start = System.currentTimeMillis();
                start += random.nextInt(1000000);
                Date now = new Date(start);
                DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
                m.set(TikaCoreProperties.CREATED, df.format(now));
                df.setTimeZone(TimeZone.getTimeZone("UTC"));
                assertTrue(Math.abs(now.getTime() - m.getDate(TikaCoreProperties.CREATED).getTime()) < 2000);

            }
            return 1;
        }
    }
    
    @Test
    public void testEquals() {
        Metadata meta1 = new Metadata();
        meta1.add("key", "value1");
        meta1.add("key", "value2");
        meta1.add("key2", "value12");
        
        Metadata meta2 = new Metadata();
        meta2.add("key", "value1");
        meta2.add("key", "value2");
        meta2.add("key2", "value12");
        
        assertEquals(meta1, meta2);
    }
    
    @Test
    public void testNotEquals() {
        Metadata meta1 = new Metadata();
        meta1.add("key", "value1");
        meta1.add("key", "value2");
        meta1.add("key2", "value12");
        
        Metadata meta2 = new Metadata();
        meta2.add("key", "value1");
        meta2.add("key", "value2");
        meta2.add("key2", "value22");
        
        assertFalse(meta1.equals(meta2));
    }
    
    @Test
    public void testEqualAndHashCode() {
        Metadata meta1 = new Metadata();
        meta1.add("key", "value1");
        meta1.add("key", "value2");
        meta1.add("key2", "value12");
        
        Metadata meta2 = new Metadata();
        meta2.add("key", "value1");
        meta2.add("key", "value2");
        meta2.add("key2", "value12");
        
        assertEquals(meta1, meta2);
        assertEquals(meta1.hashCode(), meta2.hashCode());
    }
    
    @Test
    public void testToStringWithManyEntries() {
        Metadata m = new Metadata();
        m.add("key", "value1");
        m.add("key", "value2");
        m.add("key2", "value12");
        assertEquals("key2=value12 key=value1 key=value2", m.toString());
    }
    
    @Test
    public void testToStringWithSingleEntry() {
        Metadata m = new Metadata();
        m.add("key", "value1");
        assertEquals("key=value1", m.toString());
    }
}
