// Unit test for the mobile keyboard-lift logic (pure function, no DOM).
// The composer must sit exactly on top of the keyboard. The amount to lift it is the gap between the
// LAYOUT viewport (document.documentElement.clientHeight) and the VISIBLE viewport
// (window.visualViewport.height + offsetTop). This is self-adapting across Capacitor keyboard resize
// modes, and needs no per-device constant.
//
// Run: node test/keyboard-lift.test.js

function bzKeyboardLift(clientHeight, vvHeight, vvTop) {
  return Math.max(0, Math.round(clientHeight - vvHeight - (vvTop || 0)));
}

// Cases use REAL numbers captured from the on-device debug readout (iPhone, dpr=3):
const cases = [
  // [name, clientHeight, vvHeight, vvTop, expectedLift]
  ['keyboard closed (all equal)                ', 926, 926, 0, 0],
  ['resize:native open (WebView shrank; residual)', 581, 535, 0, 46],   // <- the device values you sent
  ['resize:none open (WebView full; full lift) ', 926, 581, 0, 345],
  ['with a visual-viewport offset               ', 926, 560, 20, 346],
  ['guard: never negative                       ', 500, 600, 0, 0],
];

let pass = 0, fail = 0;
for (const [name, ch, vh, vt, expected] of cases) {
  const got = bzKeyboardLift(ch, vh, vt);
  const ok = got === expected;
  console.log(`${ok ? 'PASS' : 'FAIL'}  ${name}  lift=${got}${ok ? '' : ` (expected ${expected})`}`);
  ok ? pass++ : fail++;
}
console.log(`\n${pass} passed, ${fail} failed`);
process.exit(fail ? 1 : 0);