import { globalShortcut } from "electron";

export function isGlobalShortcutRegisteredSafe(accelerator: string): boolean {
  try {
    return globalShortcut.isRegistered(accelerator);
  } catch {
    return false;
  }
}

export function shortcutMatchesInputForLocalFallback(
  input: Electron.Input,
  accelerator: string,
  allowWhenRegistered = false,
): boolean {
  if (input.type !== "keyDown" || input.isAutoRepeat) return false;
  if (!accelerator) return false;
  if (!allowWhenRegistered && isGlobalShortcutRegisteredSafe(accelerator)) {
    return false;
  }

  const normalized = accelerator
    .replace(/\s+/g, "")
    .replace(/cmdorctrl/gi, "CommandOrControl")
    .toLowerCase();
  const parts = normalized.split("+").filter(Boolean);
  if (parts.length === 0) return false;

  const keyToken = parts[parts.length - 1];
  const modifierTokens = new Set(parts.slice(0, -1));
  const allowedModifiers = new Set([
    "shift",
    "alt",
    "meta",
    "control",
    "commandorcontrol",
  ]);
  for (const token of modifierTokens) {
    if (!allowedModifiers.has(token)) return false;
  }

  const inputKey = (input.key || "").toLowerCase();
  if (keyToken.length === 1) {
    if (inputKey !== keyToken) return false;
  } else if (keyToken.startsWith("key") && keyToken.length === 4) {
    if (inputKey !== keyToken.slice(3)) return false;
  } else {
    return false;
  }

  const expectedShift = modifierTokens.has("shift");
  const expectedAlt = modifierTokens.has("alt");
  const expectedMeta = modifierTokens.has("meta");
  const expectedControl = modifierTokens.has("control");
  const expectedCommandOrControl = modifierTokens.has("commandorcontrol");

  if (Boolean(input.shift) !== expectedShift) return false;
  if (Boolean(input.alt) !== expectedAlt) return false;

  if (expectedCommandOrControl) {
    const hasCmdOrCtrl =
      process.platform === "darwin"
        ? Boolean(input.meta || input.control)
        : Boolean(input.control);
    if (!hasCmdOrCtrl) return false;
  } else {
    if (process.platform === "darwin") {
      if (input.meta || input.control) return false;
    } else if (input.control) {
      return false;
    }
  }

  if (expectedMeta && !input.meta) return false;
  if (!expectedMeta && modifierTokens.has("meta") === false && input.meta) {
    if (!expectedCommandOrControl) return false;
  }

  if (expectedControl && !input.control) return false;
  if (
    !expectedControl &&
    modifierTokens.has("control") === false &&
    input.control
  ) {
    if (!expectedCommandOrControl) return false;
  }

  return true;
}