package dev.projectcapture.contenttools;

import java.io.IOException;
import java.io.PrintStream;
import java.nio.file.Path;

public final class ContentTool {
    private ContentTool() {}

    public static void main(String[] args) {
        int exitCode = run(args, System.out, System.err);
        if (exitCode != 0) {
            System.exit(exitCode);
        }
    }

    static int run(String[] args, PrintStream out, PrintStream err) {
        if (args.length != 2) {
            printUsage(err);
            return 64;
        }

        Path contentRoot = Path.of(args[1]).toAbsolutePath().normalize();
        return switch (args[0]) {
            case "validate" -> validate(contentRoot, out, err);
            case "digest" -> digest(contentRoot, out, err);
            default -> {
                err.println("Unknown command: " + args[0]);
                printUsage(err);
                yield 64;
            }
        };
    }

    private static int validate(Path contentRoot, PrintStream out, PrintStream err) {
        ValidationReport report = new ContentValidator().validate(contentRoot);
        if (!report.isValid()) {
            err.println("Content validation failed with " + report.issues().size() + " issue(s):");
            report.issues().forEach(issue -> err.println("- " + issue));
            return 2;
        }
        out.println("Content validation passed: " + contentRoot);
        return 0;
    }

    private static int digest(Path contentRoot, PrintStream out, PrintStream err) {
        ValidationReport report = new ContentValidator().validate(contentRoot);
        if (!report.isValid()) {
            err.println("Digest refused because content validation failed:");
            report.issues().forEach(issue -> err.println("- " + issue));
            return 2;
        }
        try {
            out.println(ContentBundle.load(contentRoot).digest());
            return 0;
        } catch (IOException | RuntimeException exception) {
            err.println("Could not calculate digest: " + exception.getMessage());
            return 2;
        }
    }

    private static void printUsage(PrintStream stream) {
        stream.println("Usage:");
        stream.println("  content-tools validate <content-root>");
        stream.println("  content-tools digest <content-root>");
    }
}