import { setupTest, startEngine, openCmdFifo, wait, ensureGenTone, execSync, readStatusNonBlock, teardownTest } from './test_utils';
import * as globals from "./test_globals";

export async function testStatusFifoLevelLine(): Promise<void> {
  console.log("\nTest: STATUS FIFO LEVEL LINE AFTER TONE");
  const engine = await startEngine();
  openCmdFifo();
  await wait(500);

  // Play tone directly (not through TUI)
  ensureGenTone();
  execSync(`${globals.GEN_TONE_BIN} 1.0 "looper:ch0in"`, { timeout: 5000 });

  // Wait for engine to write status
  await wait(2000);

  // Read status FIFO directly
  const data = readStatusNonBlock();
  const hasLevel = data.includes("LEVEL=");
  console.log("  Status FIFO data:", data.slice(0, 500));
  if (hasLevel) {
    console.log("  PASS: LEVEL line found in status FIFO");
  } else {
    console.log("  FAIL: No LEVEL line in status FIFO. Check engine RMS computation.");
    engine.kill(); teardownTest();
    throw new Error("Level line missing from status FIFO");
  }
  engine.kill(); teardownTest();
}