import java.io.File;
import java.util.ArrayList;
import java.util.List;

/**
 * Launcher for UDD context-probe validation on the real engine code path.
 *
 * Preferred (runs production planner/analyzer via JUnit):
 *   mvn -pl fs-service test -Dtest=ContextProbeScenarioTest,DeepDialogueReplyPlannerTest
 *
 * This script tries to invoke Maven when {@code --run} is passed; otherwise prints guidance.
 *
 * HTTP end-to-end (requires running backend):
 *   POST /workflow/simulate  → expect mode=engine, uddUsed=true
 */
public class SimulateDialogueProbeMain {

    public static void main(String[] args) throws Exception {
        System.out.println("=== UDD Context Probe (engine path) ===\n");
        System.out.println("Unit tests (ConversationContextAnalyzer + ConversationProbePlanner):");
        System.out.println("  mvn -pl fs-service test -Dtest=ContextProbeScenarioTest,DeepDialogueReplyPlannerTest");
        System.out.println();
        System.out.println("HTTP simulate (same evolve() path as real chat):");
        System.out.println("  POST /workflow/simulate  expect mode=engine uddUsed=true");
        System.out.println("  response: reply + followUpMessages + followUpDelayMs");
        System.out.println();
        System.out.println("Deploy: restart fs-service + run sql/lobster_engine_prompt_udd_context_probe.sql");
        System.out.println("        + sql/lobster_engine_prompt_human_like.sql");
        System.out.println();

        if (args.length > 0 && "--run".equals(args[0])) {
            int exit = runMavenTests();
            System.exit(exit);
        } else {
            System.out.println("Tip: pass --run to auto-invoke Maven tests when mvn is on PATH.");
        }
    }

    private static int runMavenTests() throws Exception {
        File repoRoot = locateRepoRoot();
        if (repoRoot == null) {
            System.err.println("[FAIL] Cannot locate repo root (expected java/fs-service/pom.xml)");
            return 1;
        }
        List<String> cmd = new ArrayList<>();
        String mvn = System.getenv("MAVEN_HOME") != null
                ? System.getenv("MAVEN_HOME") + File.separator + "bin" + File.separator + "mvn"
                : "mvn";
        cmd.add(mvn);
        cmd.add("-pl");
        cmd.add("fs-service");
        cmd.add("test");
        cmd.add("-Dtest=ContextProbeScenarioTest,DeepDialogueReplyPlannerTest");

        ProcessBuilder pb = new ProcessBuilder(cmd);
        pb.directory(repoRoot);
        pb.redirectErrorStream(true);
        Process p = pb.start();
        p.getInputStream().transferTo(System.out);
        int code = p.waitFor();
        System.out.println("\nMaven exit code: " + code);
        return code;
    }

    private static File locateRepoRoot() {
        File dir = new File(System.getProperty("user.dir"));
        for (int i = 0; i < 6 && dir != null; i++) {
            File pom = new File(dir, "java" + File.separator + "fs-service" + File.separator + "pom.xml");
            if (pom.isFile()) {
                return dir;
            }
            dir = dir.getParentFile();
        }
        return null;
    }
}