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

import static org.apache.poi.hssf.HSSFTestDataSamples.openSampleWorkbook;
import static org.junit.jupiter.api.Assertions.assertEquals;

import java.io.IOException;

import org.apache.poi.hssf.HSSFTestDataSamples;
import org.junit.jupiter.api.Test;

/**
 * Tests for {@link HSSFHeader} / {@link HSSFFooter}
 */
final class TestHSSFHeaderFooter {

	/**
	 * Tests that get header retrieves the proper values.
	 */
	@Test
	void testRetrieveCorrectHeader() throws IOException {

		try (HSSFWorkbook wb = openSampleWorkbook("EmbeddedChartHeaderTest.xls")) {
			HSSFSheet s = wb.getSheetAt(0);
			HSSFHeader head = s.getHeader();

			assertEquals("Top Left", head.getLeft());
			assertEquals("Top Center", head.getCenter());
			assertEquals("Top Right", head.getRight());
		}
	}

	@Test
	void testSpecialChars() {
		assertEquals("&U", HSSFHeader.startUnderline());
		assertEquals("&U", HSSFHeader.endUnderline());
		assertEquals("&P", HSSFHeader.page());

		assertEquals("&22", HSSFFooter.fontSize((short)22));
		assertEquals("&\"Arial,bold\"", HSSFFooter.font("Arial", "bold"));
	}

	@Test
	void testStripFields() throws IOException {
		String simple = "I am a test header";
		String withPage = "I am a&P test header";
		String withLots = "I&A am&N a&P test&T header&U";
		String withFont = "I&22 am a&\"Arial,bold\" test header";
		String withOtherAnds = "I am a&P test header&&";
		String withOtherAnds2 = "I am a&P test header&a&b";

		assertEquals(simple, HSSFHeader.stripFields(simple));
		assertEquals(simple, HSSFHeader.stripFields(withPage));
		assertEquals(simple, HSSFHeader.stripFields(withLots));
		assertEquals(simple, HSSFHeader.stripFields(withFont));
		assertEquals(simple + "&&", HSSFHeader.stripFields(withOtherAnds));
		assertEquals(simple + "&a&b", HSSFHeader.stripFields(withOtherAnds2));

		// Now test the default strip flag
		try (HSSFWorkbook wb = openSampleWorkbook("EmbeddedChartHeaderTest.xls")) {
			HSSFSheet s = wb.getSheetAt(0);
			HSSFHeader head = s.getHeader();

			assertEquals("Top Left", head.getLeft());
			assertEquals("Top Center", head.getCenter());
			assertEquals("Top Right", head.getRight());

			head.setLeft("Top &P&F&D Left");
			assertEquals("Top &P&F&D Left", head.getLeft());

			assertEquals("Top  Left", HeaderFooter.stripFields(head.getLeft()));

			// Now even more complex
			head.setCenter("HEADER TEXT &P&N&D&T&Z&F&F&A&G&X END");
			assertEquals("HEADER TEXT  END", HeaderFooter.stripFields(head.getCenter()));
		}
	}

	/**
	 * Tests that get header retrieves the proper values.
	 */
	@Test
	void testRetrieveCorrectFooter() throws IOException {
		try (HSSFWorkbook wb = openSampleWorkbook("EmbeddedChartHeaderTest.xls")) {
			HSSFSheet s = wb.getSheetAt(0);
			HSSFFooter foot = s.getFooter();

			assertEquals("Bottom Left", foot.getLeft());
			assertEquals("Bottom Center", foot.getCenter());
			assertEquals("Bottom Right", foot.getRight());
		}
	}

	/**
	 * Testcase for Bug 17039 HSSFHeader  does not support DBCS
	 */
	@Test
	void testHeaderHas16bitCharacter() throws IOException {
		try (HSSFWorkbook b = new HSSFWorkbook()) {
			HSSFSheet s = b.createSheet("Test");
			HSSFHeader h = s.getHeader();
			h.setLeft("\u0391");
			h.setCenter("\u0392");
			h.setRight("\u0393");

			try (HSSFWorkbook b2 = HSSFTestDataSamples.writeOutAndReadBack(b)) {
				HSSFHeader h2 = b2.getSheet("Test").getHeader();

				assertEquals(h2.getLeft(), "\u0391");
				assertEquals(h2.getCenter(), "\u0392");
				assertEquals(h2.getRight(), "\u0393");
			}
		}
	}

	/**
	 * Testcase for Bug 17039 HSSFFooter does not support DBCS
	 */
	@Test
	 void testFooterHas16bitCharacter() throws IOException {
		try (HSSFWorkbook b = new HSSFWorkbook()) {
			HSSFSheet s = b.createSheet("Test");
			HSSFFooter f = s.getFooter();
			f.setLeft("\u0391");
			f.setCenter("\u0392");
			f.setRight("\u0393");

			try (HSSFWorkbook b2 = HSSFTestDataSamples.writeOutAndReadBack(b)) {
				HSSFFooter f2 = b2.getSheet("Test").getFooter();

				assertEquals(f2.getLeft(), "\u0391");
				assertEquals(f2.getCenter(), "\u0392");
				assertEquals(f2.getRight(), "\u0393");
			}
		}
	}

	@Test
	void testReadDBCSHeaderFooter() throws IOException {
		try (HSSFWorkbook wb = openSampleWorkbook("DBCSHeader.xls")) {
			HSSFSheet s = wb.getSheetAt(0);
			HSSFHeader h = s.getHeader();
			assertEquals(h.getLeft(), "\u090f\u0915", "Header Left");
			assertEquals(h.getCenter(), "\u0939\u094b\u0917\u093e", "Header Center");
			assertEquals(h.getRight(), "\u091c\u093e", "Header Right");

			HSSFFooter f = s.getFooter();
			assertEquals(f.getLeft(), "\u091c\u093e", "Footer Left");
			assertEquals(f.getCenter(), "\u091c\u093e", "Footer Center");
			assertEquals(f.getRight(), "\u091c\u093e", "Footer Right");
		}
	}

	/**
	 * Excel tolerates files with missing HEADER/FOOTER records.  POI should do the same.
	 */
	@Test
	void testMissingHeaderFooterRecord_bug47244() throws IOException {
		// noHeaderFooter47244.xls was created by a slightly modified POI
		// which omitted the HEADER/FOOTER records
		try (HSSFWorkbook wb = openSampleWorkbook("noHeaderFooter47244.xls")) {
			HSSFSheet sheet = wb.getSheetAt(0);
			// bug 47244a - NullPointerException
			HSSFFooter footer = sheet.getFooter();
			assertEquals("", footer.getRawText());
			HSSFHeader header = sheet.getHeader();
			assertEquals("", header.getRawText());

			// make sure header / footer is properly linked to underlying data
			HSSFHeader header2 = sheet.getHeader();
			header.setCenter("foo");
			assertEquals("foo", header2.getCenter());

			HSSFFooter footer2 = sheet.getFooter();
			footer.setCenter("bar");
			assertEquals("bar", footer2.getCenter());
		}
	}
}