import { setupTest, startEngine, startClientInTmux, openCmdFifo, writeFifoCommand, wait, tmuxSendKeys, tmuxCapturePane, ensureGenTone, execSync, waitForStatusContaining, teardownTest } from './test_utils';
import * as path from "path";
import * as fs from "fs";
import * as globals from "./test_globals";

export async function testTUIRecordAndLoop(): Promise<void> {
  console.log("\nTest: TUI RECORD AND LOOP (T key)");
  setupTest();
  const engine = await startEngine();
  await startClientInTmux();
  openCmdFifo();
  ensureGenTone();
  await wait(500);

  // press 't' to start recording on default cell (col 0, row 0)
  tmuxSendKeys("looper", "0", "t");
  await wait(1000);

  // 1) Check status FIFO shows RECORD
  const statusRec = await waitForStatusContaining("RECORD", 5000);
  if (!statusRec.includes("RECORD")) {
    console.log("  FAIL: Status FIFO did not show RECORD after pressing t");
    engine.kill(); teardownTest();
    throw new Error("RECORD state not achieved via TUI");
  }
  console.log("  PASS: Status FIFO shows RECORD");

  // 2) Check tmux pane for 'R' indicator (first character of cell in grid)
  const paneAfterT = tmuxCapturePane("looper", "0");
  const paneContainsR = paneAfterT.includes("R");
  if (!paneContainsR) {
    console.log("  FAIL: TUI grid does not show 'R' indicator after pressing t");
    console.log("  Pane excerpt (maybe): " + paneAfterT.slice(0, 1000));
    engine.kill(); teardownTest();
    throw new Error("Grid indicator not updated");
  }
  console.log("  PASS: TUI grid shows 'R' indicator");

  // Play tone into looper:ch0in (3 seconds)
  execSync(`${globals.GEN_TONE_BIN} 3.0 "looper:ch0in"`, { timeout: 8000 });

  // press 't' again to stop recording -> loop
  tmuxSendKeys("looper", "0", "t");
  const statusLoop = await waitForStatusContaining("LOOPING", 8000);
  if (!statusLoop.includes("LOOPING")) {
    console.log("  WARN: Did not see LOOPING in status, continuing");
  } else {
    console.log("  PASS: Status FIFO shows LOOPING after second t");
  }

  // Check pane for 'L' indicator
  const paneAfterLoop = tmuxCapturePane("looper", "0");
  const paneContainsL = paneAfterLoop.includes("L");
  if (!paneContainsL) {
    console.log("  FAIL: TUI grid does not show 'L' indicator after loop");
    engine.kill(); teardownTest();
    throw new Error("Grid indicator not updated for LOOPING");
  }
  console.log("  PASS: TUI grid shows 'L' indicator");

  // Wait a couple of repetitions (3 seconds) then save via FIFO to verify audio
  await wait(3000);

  // Save via FIFO
  writeFifoCommand("save");
  await wait(3000);

  // Check save.wav exists and has audio
  const savePath = path.join(globals.PROJECT_DIR, "save.wav");
  let saveOk = false;
  if (fs.existsSync(savePath)) {
    const stat = fs.statSync(savePath);
    if (stat.size > 44) {
      saveOk = true;
      console.log(`  PASS: save.wav created (${stat.size} bytes) – loop has audio`);
    }
  }
  if (!saveOk) {
    console.log("  FAIL: save.wav not created or too small – loop not producing audio");
    engine.kill(); teardownTest();
    throw new Error("Loop playback not producing audio");
  }

  engine.kill();
  teardownTest();
}