import fs from 'node:fs';

import type { PresentationSettings } from '../../shared/types/presentationSettings';
import { DEFAULT_PRESENTATION_SETTINGS } from '../../shared/types/presentationSettings';
import { preferencesPath } from '../license/paths';

type StoredPreferences = {
  eulaAcceptedVersion?: number;
  presentation?: Partial<PresentationSettings>;
};

function readAll(userData: string): StoredPreferences {
  try {
    const raw = fs.readFileSync(preferencesPath(userData), 'utf8');
    return JSON.parse(raw) as StoredPreferences;
  } catch {
    return {};
  }
}

function writeAll(userData: string, prefs: StoredPreferences): void {
  fs.mkdirSync(userData, { recursive: true });
  fs.writeFileSync(preferencesPath(userData), `${JSON.stringify(prefs, null, 2)}\n`, 'utf8');
}

export function readPresentationSettings(userData: string): PresentationSettings {
  const prefs = readAll(userData);
  return {
    ...DEFAULT_PRESENTATION_SETTINGS,
    ...prefs.presentation,
  };
}

export function writePresentationSettings(
  userData: string,
  patch: Partial<PresentationSettings>,
): PresentationSettings {
  const prefs = readAll(userData);
  const next: PresentationSettings = {
    ...DEFAULT_PRESENTATION_SETTINGS,
    ...prefs.presentation,
    ...patch,
  };
  prefs.presentation = next;
  writeAll(userData, prefs);
  return next;
}