package com.ankurm.otel;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;

/** Collects lines and writes output/NN-name[-on-4.1.2].txt. Tests assert what they write. */
final class Transcript {

	static final String LABEL = System.getProperty("boot.label", "4.2.0-RC1");

	static boolean is42() {
		return LABEL.startsWith("4.2");
	}

	private final List<String> lines = new ArrayList<>();
	private final Path file;

	Transcript(String name) {
		String suffix = is42() ? "" : "-on-" + LABEL;
		this.file = Path.of("output", name + suffix + ".txt");
		line("# " + name + "  (Spring Boot " + LABEL + ", JDK " + Runtime.version().feature() + ")");
	}

	Transcript line(String s) {
		lines.add(s);
		return this;
	}

	void write() {
		try {
			Files.createDirectories(file.getParent());
			Files.write(file, lines);
		}
		catch (IOException ex) {
			throw new IllegalStateException(ex);
		}
	}
}