project/src/main/java/edu/homework/crawler/command/CrawlCommand.java

package edu.homework.crawler.command;

import edu.homework.crawler.exception.CommandException;
import edu.homework.crawler.exception.CrawlException;
import edu.homework.crawler.model.CrawlRequest;
import edu.homework.crawler.repository.OutputFormat;

import java.nio.file.Path;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Map;

public class CrawlCommand implements Command {
    private static final DateTimeFormatter FILE_TIME = DateTimeFormatter.ofPattern("yyyyMMdd-HHmmss");

    @Override
    public String name() {
        return "crawl";
    }

    @Override
    public String description() {
        return "Crawl news and save to a JSON or CSV file.";
    }

    @Override
    public void execute(CommandContext context, String[] args) throws CrawlException {
        Map<String, String> options = context.commandRegistry().parseOptions(args);
        String site = options.getOrDefault("site", "all");
        int limit = parseLimit(options.getOrDefault("limit", "10"));
        OutputFormat format = OutputFormat.from(options.getOrDefault("format", "json"));
        Path outputPath = Path.of(options.getOrDefault("out", defaultOutput(format)));

        context.view().printInfo("Starting crawl: site=" + site + ", limit=" + limit + ", format=" + format.name().toLowerCase());
        CrawlRequest request = new CrawlRequest(site, limit, format, outputPath);
        context.view().printSummary(context.controller().crawl(request));
    }

    private int parseLimit(String value) throws CommandException {
        try {
            int limit = Integer.parseInt(value);
            if (limit <= 0 || limit > 100) {
                throw new CommandException("Limit must be between 1 and 100.");
            }
            return limit;
        } catch (NumberFormatException e) {
            throw new CommandException("Limit must be a number: " + value);
        }
    }

    private String defaultOutput(OutputFormat format) {
        String suffix = format == OutputFormat.JSON ? ".json" : ".csv";
        return "data/news-" + LocalDateTime.now().format(FILE_TIME) + suffix;
    }
}