package cn.edu.bjut.textmining.util;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;

/** UTF-8文件读写；数据路径相对于项目根目录。 */
public final class Chapter4Files {
    private Chapter4Files() {}

    public static Path data(String name) {
        return Paths.get("data", "chapter4", name);
    }

    public static Path output(String name) {
        return Paths.get("output", "chapter4", name);
    }

    public static List<String> read(Path path) {
        List<String> lines = new ArrayList<String>();
        try (BufferedReader reader = Files.newBufferedReader(path, StandardCharsets.UTF_8)) {
            for (String line; (line = reader.readLine()) != null; ) {
                lines.add(line);
            }
        } catch (IOException e) {
            throw new UncheckedIOException("读取文件失败：" + path.toAbsolutePath(), e);
        }
        return lines;
    }

    public static void write(Path path, String text) {
        try {
            Files.createDirectories(path.getParent());
            BufferedWriter writer = Files.newBufferedWriter(path, StandardCharsets.UTF_8); 
            writer.write(text);
        } catch (IOException e) {
            throw new UncheckedIOException("保存文件失败：" + path.toAbsolutePath(), e);
        }
    }
}