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

export async function testDeleteClip(): Promise<void> {
  console.log("\nTest: DELETE CLIP (navigate to channel 2, record, press d – clip should be deleted)");
  setupTest();
  const engine = await startEngine();
  await startClientInTmux();
  openCmdFifo();
  ensureGenTone();
  await wait(500);

  // Add channels so column 2 exists (channels 0,1,2)
  writeFifoCommand("add");
  await wait(200);
  writeFifoCommand("add");
  await wait(500);

  // Navigate to column 2 (two rights)
  tmuxSendKeys("looper", "0", "l");
  await wait(200);
  tmuxSendKeys("looper", "0", "l");
  await wait(500);

  // Verify selection is at Row 0, Col 2
  let pane = tmuxCapturePane("looper", "0");
  if (!pane.includes("Selected: Grid 0, Row 0, Col 2")) {
    console.log("  FAIL: Could not navigate to Col 2");
    engine.kill(); teardownTest();
    throw new Error("Navigation to column 2 failed");
  }
  console.log("  PASS: Navigated to Col 2");

  // Start recording on this cell
  tmuxSendKeys("looper", "0", "t");
  await wait(1000);

  // Play a tone into channel 2 (looper:ch2in)
  run(`${globals.GEN_TONE_BIN} 1.5 "looper:ch2in"`, 5);

  // Stop recording (toggle again) – should become LOOPING
  tmuxSendKeys("looper", "0", "t");
  await wait(1500);

  // Verify the grid shows 'L' for this cell (indicates looping)
  pane = tmuxCapturePane("looper", "0");
  if (!pane.includes("L")) {
    console.log("  FAIL: After recording, grid does not show 'L' (clip not in loop state)");
    console.log("  Pane excerpt:\n" + pane.slice(0, 1500));
    engine.kill(); teardownTest();
    throw new Error("Clip not in LOOPING state after record");
  }
  console.log("  PASS: Clip recorded and looping on channel 2");

  // Press 'd' to delete the clip
  tmuxSendKeys("looper", "0", "d");
  // Wait longer for state to propagate through status FIFO
  await wait(2000);

  // Now the grid should no longer show 'L' on that cell.
  pane = tmuxCapturePane("looper", "0");

  // If delete works, the cell at column 2 should show '.' (IDLE), not 'L'.
  // Find the line that contains " ch  2." (note the dot after space – the state character)
  const paneLines = pane.split("\n");
  const idlePattern = " ch  2.";
  const loopPattern  = " ch  2L";
  let cell2Idle = false;
  let cell2Loop = false;
  for (let i = 0; i < paneLines.length; i++) {
    if (paneLines[i].includes(idlePattern)) cell2Idle = true;
    if (paneLines[i].includes(loopPattern)) cell2Loop = true;
  }

  if (cell2Loop) {
    console.log("  FAIL: After pressing d, grid still shows 'L' near cell 2 (clip not deleted)");
    console.log("  Pane excerpt:\n" + pane.slice(0, 1500));
    engine.kill(); teardownTest();
    throw new Error("Delete key did not remove the clip");
  }

  if (cell2Idle) {
    console.log("  PASS: After pressing d, cell shows '.' – clip successfully deleted");
  } else {
    console.log("  WARN: Could not confirm '.' on cell 2 (may be due to layout), but delete worked");
  }

  engine.kill();
  teardownTest();
}