package cn.edu.bjut.textmining.chapter7;

import java.io.BufferedReader;
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;

/**
 * 第7章数据与输出路径工具。
 */
public final class Chapter7Data {

    private Chapter7Data() {
    }

    public static Path dataPath(String name) {
        return Paths.get("data", "chapter7", name);
    }

    public static Path outputPath(String name) {
        try {
            Path directory = Paths.get("output", "chapter7");
            Files.createDirectories(directory);
            return directory.resolve(name);
        } catch (IOException e) {
            throw new UncheckedIOException("创建输出目录失败", e);
        }
    }

    public static String display(Path path) {
        return path.normalize().toString().replace('\\', '/');
    }

    public static List<String> readNonBlankLines(String name) {
        try {
            List<String> lines = new ArrayList<String>();
            try (BufferedReader reader = Files.newBufferedReader(dataPath(name), StandardCharsets.UTF_8)) {
                String line;
                while ((line = reader.readLine()) != null) {
                    line = line.trim();
                    if (!line.isEmpty() && !line.startsWith("#")) {
                        lines.add(line);
                    }
                }
            }
            return lines;
        } catch (IOException e) {
            throw new UncheckedIOException("读取第7章数据失败", e);
        }
    }
}