import { run } from './run';

/**
 * Let go of everything the display thinks is held.
 *
 * ── Why this needs to exist at all ──
 *
 * Synthesised input is state, and this side owns it. A press without a matching release stays pressed on
 * the X server forever, and there is nothing to notice: the panel looks connected, the picture updates,
 * the game responds. It just responds WRONGLY. A stranded `Shift_L` turned every left click into a
 * shift-click, which Minesweeper reads as a right click, so the board flagged instead of opening.
 *
 * The panel now releases what it holds on blur and on unmount, and no longer sends modifiers at all — so
 * this should never be needed. "Should never be needed" is exactly the class of thing that wants a button,
 * because when it IS needed the symptom names nothing and the only other cure is restarting the session
 * and losing the game in progress.
 *
 * ── Why a fixed list rather than asking what is down ──
 *
 * `xinput --query-state` would report exactly what is held, which is better. It is also a seventh host
 * binary this plugin would have to declare and a machine would have to have, for a repair. Releasing a key
 * that was not pressed is a no-op, so the fixed list costs nothing and needs nothing.
 *
 * Modifiers and buttons only, deliberately. They are what DISTORTS input — a stuck letter types, which is
 * obvious and harmless; a stuck modifier silently changes what every click means.
 */
const MODIFIERS = [
  'Shift_L',
  'Shift_R',
  'Control_L',
  'Control_R',
  'Alt_L',
  'Alt_R',
  'Super_L',
  'Super_R',
  'Meta_L',
  'Meta_R',
  'ISO_Level3_Shift',
];

const BUTTONS = ['1', '2', '3', '4', '5'];

export type ResetResult = { ok: boolean; released: { modifiers: number; buttons: number } };

export async function resetInput(display: string): Promise<ResetResult> {
  const keys = await run(['xdotool', 'keyup', ...MODIFIERS], { DISPLAY: display }, 5_000);
  let buttons = 0;
  for (const button of BUTTONS) {
    const up = await run(['xdotool', 'mouseup', button], { DISPLAY: display }, 5_000);
    if (up.ok) buttons++;
  }
  return { ok: keys.ok, released: { modifiers: keys.ok ? MODIFIERS.length : 0, buttons } };
}