// Runs FILIUS's own IP.ipCheck on every case of a list and writes what Java
// returns — the reference for packages/fls/src/javaIp.ts. The cases file is
// ASCII, one case per line, with Java-style unicode escapes (backslash, u,
// four hex digits) for anything else (so no editor or
// hook can change a case by trimming or normalising it).
//
// Usage: java -cp filius.jar:lib/*:classes IpCheckCases <cases txt> <output json>

import filius.software.vermittlungsschicht.IP;

import java.io.FileOutputStream;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class IpCheckCases {

    public static void main(String[] args) throws Exception {
        List<Object> result = new ArrayList<>();
        for (String line : Files.readAllLines(Path.of(args[0]), StandardCharsets.US_ASCII)) {
            String input = unescape(line);
            String output;
            try {
                output = IP.ipCheck(input);
            } catch (RuntimeException error) {
                output = "!" + error.getClass().getSimpleName();
            }
            result.add(Arrays.asList(line, output));
        }
        try (FileOutputStream out = new FileOutputStream(args[1])) {
            out.write((FlsOracle.Json.write(result, "") + "\n").getBytes(StandardCharsets.UTF_8));
        }
        System.out.println("ip check cases: " + result.size());
        System.exit(0);
    }

    static String unescape(String line) {
        StringBuilder out = new StringBuilder();
        for (int index = 0; index < line.length(); index++) {
            if (line.startsWith("\\u", index) && index + 6 <= line.length()) {
                out.append((char) Integer.parseInt(line.substring(index + 2, index + 6), 16));
                index += 5;
            } else {
                out.append(line.charAt(index));
            }
        }
        return out.toString();
    }
}