package org.springblade.mdm.utils;

import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
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;

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 {
		String file = "D:/a.txt";
		int lineIndex = 1;
		FileInputStream fis = new FileInputStream(file);

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

	}
}