/**
 * Proof of Concept: End-to-End Orchestration Runner (Gen 3)
 *
 * This PoC demonstrates wiring multiple Gen 1 & Gen 2 mechanisms into a single
 * cohesive CLI workflow (the "Flywheel"). It mocks the sequence of extracting
 * a Merkle diff, fetching a state constraint, and recording a Git Note.
 */

export async function runOrchestrationRunnerPoC(): Promise<void> {
  console.log("Starting End-to-End Orchestration Runner PoC...");

  // Step 1: Merkle Diff Extractor Simulation
  // In a real run, this would use `git diff-tree`. Here we use a native Deno command to run git log just to prove git integration.
  console.log("\\n[Step 1] Extracting Scoped Merkle Diff...");
  const gitDiffCmd = new Deno.Command("git", {
    args: ["log", "-1", "--format=%H"],
    stdout: "piped",
  });
  const diffOut = await gitDiffCmd.output();
  const latestCommit = new TextDecoder().decode(diffOut.stdout).trim();
  console.log(`[OK] Detected target commit hash: ${latestCommit}`);

  // Step 2: State-Machine Evaluator Simulation
  // We simulate reading the transitions matrix to see if we can proceed.
  console.log("\\n[Step 2] Evaluating State-Machine Transitions...");
  const transitionMatrix = {
    "Coder": { "requires": ["Gatekeeper_Approval"] },
    "Gatekeeper_Approval": { "status": "GRANTED" },
  };

  if (transitionMatrix["Gatekeeper_Approval"].status !== "GRANTED") {
    throw new Error(
      "Pipeline Halted: Bounded Model Checking failed. Gatekeeper approval required.",
    );
  }
  console.log("[OK] Bounded Model Checking passed. Transitions approved.");

  // Step 3: Git Notes Ledger Recording
  // We write a telemetry JSON payload to the Git Note of the latest commit.
  console.log("\\n[Step 3] Wiring Telemetry to Git Notes Ledger...");
  const telemetryPayload = JSON.stringify({
    agent: "Orchestrator",
    action: "E2E_Flywheel_Cycle_Complete",
    timestamp: new Date().toISOString(),
    status: "SUCCESS",
  });

  // Write note (we use a temporary namespace for the PoC to avoid polluting standard notes)
  const addNoteCmd = new Deno.Command("git", {
    args: [
      "notes",
      "--ref=forum/poc-g3-telemetry",
      "add",
      "-f",
      "-m",
      telemetryPayload,
      latestCommit,
    ],
    stdout: "piped",
    stderr: "piped",
  });

  const noteOut = await addNoteCmd.output();
  if (!noteOut.success) {
    console.error(new TextDecoder().decode(noteOut.stderr));
    throw new Error("Failed to write Git Note.");
  }

  console.log(
    "[OK] Git Note successfully attached to commit hash on ref 'forum/poc-g3-telemetry'.",
  );

  // Verify Note
  const verifyNoteCmd = new Deno.Command("git", {
    args: ["notes", "--ref=forum/poc-g3-telemetry", "show", latestCommit],
    stdout: "piped",
  });
  const verifyOut = await verifyNoteCmd.output();
  const readNote = new TextDecoder().decode(verifyOut.stdout).trim();
  console.log(`[Verification] Read back from ledger: ${readNote}`);

  console.log(
    "\\n[SUCCESS] End-to-End Orchestration Runner executed the full flywheel lifecycle.",
  );
}

// If run directly
if (import.meta.main) {
  await runOrchestrationRunnerPoC();
}