/**
 * @file terminalFont — the lane terminal's font, a viewer preference kept in
 * `localStorage` (`agenthub.terminal.font`) and read by `TerminalView` when a
 * terminal opens. `jetbrains` (the default) and the rounded `maple` are
 * bundled webfonts that cover every Vietnamese letter; `system` is the browser's own
 * fixed-width font, which may not (DejaVu Sans Mono on Linux lacks ấ, ế, ố…,
 * and those glyphs then fall back to a face of another width). A change fires
 * `FONT_SIZE_EVENT` (`lib/fontSize.ts`), so an open terminal takes it too.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { FONT_SIZE_EVENT } from "./fontSize";

export const TERMINAL_FONT_KEY = "agenthub.terminal.font";

export const TERMINAL_FONTS = {
  jetbrains: '"JetBrains Mono", monospace',
  maple: '"Maple Mono", monospace',
  system: "monospace",
} as const;

export type TerminalFont = keyof typeof TERMINAL_FONTS;

export function readTerminalFont(): TerminalFont {
  try {
    const v = window.localStorage.getItem(TERMINAL_FONT_KEY);
    if (v && v in TERMINAL_FONTS) return v as TerminalFont;
  } catch {
    /* storage blocked — the default */
  }
  return "jetbrains";
}

export function writeTerminalFont(font: TerminalFont) {
  try {
    window.localStorage.setItem(TERMINAL_FONT_KEY, font);
  } catch {
    /* storage blocked — terminals keep the default */
  }
  window.dispatchEvent(new Event(FONT_SIZE_EVENT));
}