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

export async function testRecordOnSelectedCell(): Promise<void> {
  console.log("\nTest: RECORD ON SELECTED CELL (col 1, row 0)");
  setupTest();
  const engine = await startEngine();
  await startClientInTmux();
  openCmdFifo();
  ensureGenTone();
  await wait(500);

  // Add a new channel so column 1 (channel 1) exists
  writeFifoCommand("add");
  await wait(500);

  // Navigation: move right once to column 1 (channel 1)
  tmuxSendKeys("looper", "0", "l");  // right once → col 1
  await wait(500);

  // Verify selection shows column 1
  let pane = tmuxCapturePane("looper", "0");
  if (!pane.includes("Selected: Grid 0, Row 0, Col 1")) {
    console.log("  FAIL: Could not navigate to Col 1");
    engine.kill(); teardownTest();
    throw new Error("Navigation to column 1 failed");
  }
  console.log("  PASS: Successfully navigated to Col 1");

  // Press 't' to start recording – no extra key, TUI should redraw on its own
  tmuxSendKeys("looper", "0", "t");
  await wait(1500);

  // Capture the pane once – this is the TUI's state
  const paneAfter = tmuxCapturePane("looper", "0");

  // 1. The grid should show 'R' near cell 1 (col 1, row 0)
  const paneLines = paneAfter.split("\n");
  let cell1Line = -1, recordLine = -1;
  for (let i = 0; i < paneLines.length; i++) {
    if (paneLines[i].includes(" 1")) cell1Line = i;
    if (paneLines[i].includes("R"))  recordLine = i;
  }
  if (cell1Line === -1 || recordLine === -1 || Math.abs(recordLine - cell1Line) > 2) {
    console.log("  FAIL: Grid did not show 'R' near cell 1");
    console.log("  Pane excerpt:\n" + paneAfter.slice(0, 1000));
    engine.kill(); teardownTest();
    throw new Error("Grid indicator not updated for selected cell");
  }
  console.log("  PASS: Grid shows 'R' indicator near cell 1 after single 't'");

  // 2. Verify that cell (row 0, col 0) does NOT show 'R' via pane char position
  // Cell (0,0) has its state character at line 5, column 4 (based on grid layout)
  const cell00StateCh = (paneLines.length > 5 && paneLines[5].length > 4) ? paneLines[5][4] : '?';
  if (cell00StateCh === 'R') {
    console.log("  FAIL: Cell (0,0) shows 'R' (cross‑talk)");
    engine.kill(); teardownTest();
    throw new Error("Cross‑talk detected on cell 0");
  }
  console.log("  PASS: Cell (0,0) does not show 'R' (no cross‑talk)");

  engine.kill();
  teardownTest();
}