package org.springblade.mdm.utils;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.io.TempDir;
import org.springblade.core.tool.api.R;
import org.springblade.core.tool.utils.Charsets;

import java.io.*;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;

public class FileContentUtilTest {

	//@Test
	public void testInsert() throws IOException {
		int lineNo= 0;
		ByteArrayInputStream byteStream;
		ByteArrayInputStream streamForCharset;
		try (InputStream ins = new FileInputStream("D:/a.txt");){
			byte[] allBytes = ins.readAllBytes();
			byteStream = new ByteArrayInputStream(allBytes);
			streamForCharset = new ByteArrayInputStream(allBytes);
		}
		String charsetName = FileContentUtil.detectFromInputStream(streamForCharset);
		Charset charset = Charsets.charset(charsetName);//new String("test文本".getBytes(charset))
		InputStream newStream = FileContentUtil.insertLine(byteStream,1,"tes中间行t");
		try (BufferedReader reader = new BufferedReader(new InputStreamReader(newStream, charset));) {
			String line;
			//读取
			while((line = reader.readLine()) != null){
				lineNo++;
				System.out.println("line "+lineNo+":"+line);
			}
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

	//@Test
	public void testDelete() throws IOException {
		String charsetName = FileContentUtil.detectFromInputStream(new FileInputStream("D:/a.txt"));
		System.out.println(charsetName);

		Charset charset = Charsets.charset(charsetName);
		//System.out.println(charset);
	}

	//@Test
	public void testReadLineAt() throws IOException {

		Path source = Paths.get("src/test/resources/filecontenttest.txt");
		int lineIndex = 1;
		FileInputStream fis = new FileInputStream(source.toFile());

		String expected = "第二行";
		String read = FileContentUtil.readLineAt(fis,lineIndex);
		Assertions.assertEquals(expected,read);

	}

	//@Test
	public void testReplaceReadLineAt(@TempDir Path tempDir) throws IOException {
		// 加载资源文件
		Path source = Paths.get("src/test/resources/filecontenttest.txt");
		//File file = new File(classLoader.getResource("filecontenttest.txt").getFile());
		File testFile = source.toFile();
		try(FileInputStream fis = new FileInputStream(testFile);) {

			String expected = "newline2";
			int lineIndex = 1;
			InputStream ins = FileContentUtil.replaceAtLine(fis, lineIndex, expected);
			List<String> list = IOUtils.readLines(ins, Charsets.UTF_8);
			System.out.println(list);
			Assertions.assertEquals(expected, list.get(lineIndex));
		}

	}
}