/* ====================================================================
   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.usermodel;

import static org.apache.poi.hwpf.HWPFTestDataSamples.openSampleFile;
import static org.junit.jupiter.api.Assertions.assertEquals;

import java.io.IOException;

import org.apache.poi.hwpf.HWPFDocument;
import org.apache.poi.hwpf.model.PAPX;
import org.junit.jupiter.api.Test;

/**
 *	Test to see if Range.delete() works even if the Range contains a
 *	CharacterRun that uses Unicode characters.
 */
public final class TestRangeDelete {

	// u201c and u201d are "smart-quotes"
	private static final String introText =
		"Introduction\r";
	private static final String fillerText =
		"${delete} This is an MS-Word 97 formatted document created using NeoOffice v. 2.2.4 Patch 0 (OpenOffice.org v. 2.2.1).\r";
	private static final String originalText =
		"It is used to confirm that text delete works even if Unicode characters (such as \u201c\u2014\u201d (U+2014), \u201c\u2e8e\u201d (U+2E8E), or \u201c\u2714\u201d (U+2714)) are present.  Everybody should be thankful to the ${organization} ${delete} and all the POI contributors for their assistance in this matter.\r";
	private static final String lastText =
		"Thank you, ${organization} ${delete}!\r";
	private static final String searchText = "${delete}";
	private static final String expectedText1 = " This is an MS-Word 97 formatted document created using NeoOffice v. 2.2.4 Patch 0 (OpenOffice.org v. 2.2.1).\r";
	private static final String expectedText2 =
		"It is used to confirm that text delete works even if Unicode characters (such as \u201c\u2014\u201d (U+2014), \u201c\u2e8e\u201d (U+2E8E), or \u201c\u2714\u201d (U+2714)) are present.  Everybody should be thankful to the ${organization}  and all the POI contributors for their assistance in this matter.\r";
	private static final String expectedText3 = "Thank you, ${organization} !\r";

	private static final String illustrativeDocFile = "testRangeDelete.doc";

	/**
	 * Test just opening the files
	 */
	@Test
	void testOpen() throws IOException {
		try (HWPFDocument doc = openSampleFile(illustrativeDocFile)) {
			assertEquals(5, doc.getParagraphTable().getParagraphs().size());
		}
	}

	/**
	 * Test (more "confirm" than test) that we have the general structure that we expect to have.
	 */
	@Test
	void testDocStructure() throws IOException {

		try (HWPFDocument daDoc = openSampleFile(illustrativeDocFile)) {
			Range range;
			Section section;
			Paragraph para;
			PAPX paraDef;

			// First, check overall
			range = daDoc.getOverallRange();
			assertEquals(1, range.numSections());
			assertEquals(5, range.numParagraphs());


			// Now, onto just the doc bit
			range = daDoc.getRange();

			assertEquals(1, range.numSections());
			assertEquals(1, daDoc.getSectionTable().getSections().size());
			section = range.getSection(0);

			assertEquals(5, section.numParagraphs());

			para = section.getParagraph(0);
			assertEquals(1, para.numCharacterRuns());
			assertEquals(introText, para.text());

			para = section.getParagraph(1);
			assertEquals(5, para.numCharacterRuns());
			assertEquals(fillerText, para.text());


			paraDef = daDoc.getParagraphTable().getParagraphs().get(2);
			assertEquals(132, paraDef.getStart());
			assertEquals(400, paraDef.getEnd());

			para = section.getParagraph(2);
			assertEquals(5, para.numCharacterRuns());
			assertEquals(originalText, para.text());


			paraDef = daDoc.getParagraphTable().getParagraphs().get(3);
			assertEquals(400, paraDef.getStart());
			assertEquals(438, paraDef.getEnd());

			para = section.getParagraph(3);
			assertEquals(1, para.numCharacterRuns());
			assertEquals(lastText, para.text());


			// Check things match on text length
			assertEquals(439, range.text().length());
			assertEquals(439, section.text().length());
			assertEquals(439,
						 section.getParagraph(0).text().length() +
								 section.getParagraph(1).text().length() +
								 section.getParagraph(2).text().length() +
								 section.getParagraph(3).text().length() +
								 section.getParagraph(4).text().length()
			);
		}
	}

	/**
	 * Test that we can delete text (one instance) from our Range with Unicode text.
	 */
	@Test
	void testRangeDeleteOne() throws IOException {
		try (HWPFDocument daDoc = openSampleFile(illustrativeDocFile)) {

			Range range = daDoc.getOverallRange();
			assertEquals(1, range.numSections());

			Section section = range.getSection(0);
			assertEquals(5, section.numParagraphs());

			Paragraph para = section.getParagraph(2);

			String text = para.text();
			assertEquals(originalText, text);

			int offset = text.indexOf(searchText);
			assertEquals(192, offset);

			int absOffset = para.getStartOffset() + offset;
			Range subRange = new Range(absOffset, (absOffset + searchText.length()), para.getDocument());

			assertEquals(searchText, subRange.text());

			subRange.delete();
			daDoc.getOverallRange().sanityCheck();
			daDoc.getRange().sanityCheck();

			// we need to let the model re-calculate the Range before we evaluate it
			range = daDoc.getRange();

			assertEquals(1, range.numSections());
			section = range.getSection(0);

			assertEquals(5, section.numParagraphs());
			para = section.getParagraph(2);

			text = para.text();
			assertEquals(expectedText2, text);

			// this can lead to a StringBufferOutOfBoundsException, so we will add it
			// even though we don't have an assertion for it
			Range daRange = daDoc.getRange();
			daRange.sanityCheck();
			daRange.text();
		}
	}

	/**
	 * Test that we can delete text (all instances of) from our Range with Unicode text.
	 */
	@Test
	void testRangeDeleteAll() throws IOException {
		try (HWPFDocument daDoc = openSampleFile(illustrativeDocFile)) {

			Range range = daDoc.getRange();
			assertEquals(1, range.numSections());

			Section section = range.getSection(0);
			assertEquals(5, section.numParagraphs());

			Paragraph para = section.getParagraph(2);

			String text = para.text();
			assertEquals(originalText, text);

			boolean keepLooking = true;
			while (keepLooking) {
				// Reload the range every time
				range = daDoc.getRange();
				int offset = range.text().indexOf(searchText);
				if (offset >= 0) {

					int absOffset = range.getStartOffset() + offset;

					Range subRange = new Range(
							absOffset, (absOffset + searchText.length()), range.getDocument());

					assertEquals(searchText, subRange.text());

					subRange.delete();

				} else {
					keepLooking = false;
				}
			}

			// we need to let the model re-calculate the Range before we use it
			range = daDoc.getRange();

			assertEquals(1, range.numSections());
			section = range.getSection(0);

			assertEquals(5, section.numParagraphs());

			para = section.getParagraph(0);
			text = para.text();
			assertEquals(introText, text);

			para = section.getParagraph(1);
			text = para.text();
			assertEquals(expectedText1, text);

			para = section.getParagraph(2);
			text = para.text();
			assertEquals(expectedText2, text);

			para = section.getParagraph(3);
			text = para.text();
			assertEquals(expectedText3, text);
		}
	}
}