/* ====================================================================
   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.poi.hwpf.model;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

import org.apache.poi.hwpf.HWPFDocFixture;
import org.apache.poi.hwpf.HWPFDocument;
import org.apache.poi.hwpf.HWPFTestDataSamples;
import org.apache.poi.hwpf.model.io.HWPFFileSystem;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

@SuppressWarnings("deprecation")
public final class TestTextPieceTable {
    private HWPFDocFixture _hWPFDocFixture;

    @Before
    public void setUp() throws Exception {
        System.setProperty("org.apache.poi.hwpf.preserveTextTable",
                Boolean.TRUE.toString());

        _hWPFDocFixture = new HWPFDocFixture(this,
                HWPFDocFixture.DEFAULT_TEST_FILE);
        _hWPFDocFixture.setUp();
    }

    @After
    public void tearDown() throws Exception {
        _hWPFDocFixture.tearDown();
        _hWPFDocFixture = null;

        System.setProperty("org.apache.poi.hwpf.preserveTextTable",
                Boolean.FALSE.toString());
    }

    @Test
    public void testReadWrite() throws Exception {
        FileInformationBlock fib = _hWPFDocFixture._fib;
        byte[] mainStream = _hWPFDocFixture._mainStream;
        byte[] tableStream = _hWPFDocFixture._tableStream;
        int fcMin = fib.getFibBase().getFcMin();

        ComplexFileTable cft = new ComplexFileTable(mainStream, tableStream,
                fib.getFcClx(), fcMin);

        HWPFFileSystem fileSys = new HWPFFileSystem();

        cft.writeTo(fileSys);
        ByteArrayOutputStream tableOut = fileSys.getStream("1Table");
        ByteArrayOutputStream mainOut = fileSys.getStream("WordDocument");

        byte[] newTableStream = tableOut.toByteArray();
        byte[] newMainStream = mainOut.toByteArray();

        ComplexFileTable newCft = new ComplexFileTable(newMainStream,
                newTableStream, 0, 0);

        TextPieceTable oldTextPieceTable = cft.getTextPieceTable();
        TextPieceTable newTextPieceTable = newCft.getTextPieceTable();

        assertEquals(oldTextPieceTable, newTextPieceTable);
    }

    /**
     * Check that we do the positions correctly when working with pure-ascii
     */
    @Test
    public void testAsciiParts() throws Exception {
        HWPFDocument doc = HWPFTestDataSamples
                .openSampleFile("ThreeColHeadFoot.doc");
        TextPieceTable tbl = doc.getTextTable();

        // All ascii, so stored in one big lump
        assertEquals(1, tbl.getTextPieces().size());
        TextPiece tp = tbl.getTextPieces().get(0);

        assertEquals(0, tp.getStart());
        assertEquals(339, tp.getEnd());
        assertEquals(339, tp.characterLength());
        assertEquals(339, tp.bytesLength());
        assertTrue(tp.getStringBuilder().toString()
                .startsWith("This is a sample word document"));

        // Save and re-load
        HWPFDocument docB = saveAndReload(doc);
        tbl = docB.getTextTable();

        assertEquals(1, tbl.getTextPieces().size());
        tp = tbl.getTextPieces().get(0);

        assertEquals(0, tp.getStart());
        assertEquals(339, tp.getEnd());
        assertEquals(339, tp.characterLength());
        assertEquals(339, tp.bytesLength());
        assertTrue(tp.getStringBuilder().toString()
                .startsWith("This is a sample word document"));
    }

    /**
     * Check that we do the positions correctly when working with a mix ascii,
     * unicode file
     */
    @Test
    public void testUnicodeParts() throws Exception {
        HWPFDocument doc = HWPFTestDataSamples
                .openSampleFile("HeaderFooterUnicode.doc");
        TextPieceTable tbl = doc.getTextTable();

        // In three bits, split every 512 bytes
        assertEquals(3, tbl.getTextPieces().size());
        TextPiece tpA = tbl.getTextPieces().get(0);
        TextPiece tpB = tbl.getTextPieces().get(1);
        TextPiece tpC = tbl.getTextPieces().get(2);

        assertTrue(tpA.isUnicode());
        assertTrue(tpB.isUnicode());
        assertTrue(tpC.isUnicode());

        assertEquals(256, tpA.characterLength());
        assertEquals(256, tpB.characterLength());
        assertEquals(19, tpC.characterLength());

        assertEquals(512, tpA.bytesLength());
        assertEquals(512, tpB.bytesLength());
        assertEquals(38, tpC.bytesLength());

        assertEquals(0, tpA.getStart());
        assertEquals(256, tpA.getEnd());
        assertEquals(256, tpB.getStart());
        assertEquals(512, tpB.getEnd());
        assertEquals(512, tpC.getStart());
        assertEquals(531, tpC.getEnd());

        // Save and re-load
        HWPFDocument docB = saveAndReload(doc);
        tbl = docB.getTextTable();

        assertEquals(3, tbl.getTextPieces().size());
        tpA = tbl.getTextPieces().get(0);
        tpB = tbl.getTextPieces().get(1);
        tpC = tbl.getTextPieces().get(2);

        assertTrue(tpA.isUnicode());
        assertTrue(tpB.isUnicode());
        assertTrue(tpC.isUnicode());

        assertEquals(256, tpA.characterLength());
        assertEquals(256, tpB.characterLength());
        assertEquals(19, tpC.characterLength());

        assertEquals(512, tpA.bytesLength());
        assertEquals(512, tpB.bytesLength());
        assertEquals(38, tpC.bytesLength());

        assertEquals(0, tpA.getStart());
        assertEquals(256, tpA.getEnd());
        assertEquals(256, tpB.getStart());
        assertEquals(512, tpB.getEnd());
        assertEquals(512, tpC.getStart());
        assertEquals(531, tpC.getEnd());
    }

    protected HWPFDocument saveAndReload(HWPFDocument doc) throws Exception {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        doc.write(baos);

        return new HWPFDocument(new ByteArrayInputStream(baos.toByteArray()));
    }

    @Test
    public void test56549_CharIndexRange() {
        HWPFDocument doc = HWPFTestDataSamples.openSampleFile("ThreeColHeadFoot.doc");

        // there is one range from 2048 - 2387

        TextPieceTable tbl = doc.getTextTable();
        int[][] range = tbl.getCharIndexRanges(0, 0);
        assertEquals(0, range.length);

        range = tbl.getCharIndexRanges(0, 1);
        assertEquals(0, range.length);

        range = tbl.getCharIndexRanges(0, 338);
        assertEquals(0, range.length);

        range = tbl.getCharIndexRanges(0, 339);
        assertEquals(0, range.length);

        range = tbl.getCharIndexRanges(0, 340);
        assertEquals(0, range.length);

        range = tbl.getCharIndexRanges(2030, 2048);
        assertEquals(0, range.length);

        range = tbl.getCharIndexRanges(2030, 2049);
        assertEquals(1, range.length);
        assertArrayEquals(new int[] {0,1}, range[0]);

        range = tbl.getCharIndexRanges(2048, 2049);
        assertEquals(1, range.length);
        assertArrayEquals(new int[] {0,1}, range[0]);

        range = tbl.getCharIndexRanges(2048, 2300);
        assertEquals(1, range.length);
        assertArrayEquals(new int[] {0,252}, range[0]);

        range = tbl.getCharIndexRanges(2049, 2300);
        assertEquals(1, range.length);
        assertArrayEquals(new int[] {1,252}, range[0]);

        range = tbl.getCharIndexRanges(2049, 2300);
        assertEquals(1, range.length);
        assertArrayEquals(new int[] {1,252}, range[0]);

        range = tbl.getCharIndexRanges(2049, 2387);
        assertEquals(1, range.length);
        assertArrayEquals(new int[] {1,339}, range[0]);

        range = tbl.getCharIndexRanges(2049, 2388);
        assertEquals(1, range.length);
        assertArrayEquals(new int[] {1,339}, range[0]);

        range = tbl.getCharIndexRanges(2387, 2388);
        assertEquals(1, range.length);
        assertArrayEquals(new int[] {339,339}, range[0]);
    }
}