/**
 * @file nativePaste — Settings → Appearance → "Paste images natively": a
 * per-browser preference in `localStorage` (`agenthub.terminal.nativePaste`,
 * deliberately NOT synced to the account — it is about this browser's
 * machine). On (the default), a `claude` pane in a local-mode dashboard opened
 * from this machine's own browser gets an image paste as `^V`, so `claude`
 * reads the desktop clipboard itself like a native terminal — nothing is
 * uploaded or copied. Off, the image is uploaded like a remote browser's. An
 * SSH tunnel's browser also reaches the dashboard by loopback, and its `^V`
 * would read the SERVER's clipboard — that is what turning it off is for.
 * The server must also be able to read its clipboard (`nativePasteWorks`: on
 * Linux `wl-paste`/`xclip` and a display) — else the `^V` pasted nothing.
 * On Windows Claude Code binds its image paste to Alt+V, not Ctrl+V
 * (`nativePasteKey`): a `^V` there was silently ignored.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { api } from "./api";

export const NATIVE_PASTE_KEY = "agenthub.terminal.nativePaste";

/** True unless this browser turned native image paste off. */
export function readNativePaste(): boolean {
  try {
    return window.localStorage.getItem(NATIVE_PASTE_KEY) !== "off";
  } catch {
    return true;
  }
}

export function writeNativePaste(on: boolean) {
  try {
    if (on) window.localStorage.removeItem(NATIVE_PASTE_KEY);
    else window.localStorage.setItem(NATIVE_PASTE_KEY, "off");
  } catch {
    /* storage blocked — the default */
  }
}

let works: boolean | null = null;
let asked: Promise<void> | null = null;
// Claude Code's image-paste chord on the dashboard's machine: Ctrl+V, but
// Alt+V on Windows, where a ^V reaches no binding and pastes nothing.
let key = "\x16";

/** Whether the dashboard's machine can hand a pane its clipboard, as last
 *  answered — false until it has (an upload then, which always works). The
 *  first call asks the server once per page. */
export function nativePasteWorks(): boolean {
  asked ??= api.run
    .nativePaste()
    .then((r) => {
      works = r.native === true;
      key = r.key === "alt+v" ? "\x1bv" : "\x16";
    })
    .catch(() => void (works = false));
  return works === true;
}

/** The bytes that make the pane's `claude` read its clipboard: ^V, or ESC v
 *  (Alt+V) on a Windows dashboard. */
export function nativePasteKey(): string {
  return key;
}

/** Test seam: forget the server's answer. */
export function __resetNativePaste() {
  works = null;
  asked = null;
  key = "\x16";
}