import { File, Paths } from 'expo-file-system';
import * as FileSystem from 'expo-file-system/legacy';
import { FRAMES } from '../data/frames';

export interface AppSettings {
  countdownDuration: number; // in seconds
  printerIp: string;
  adminPassword: string;
  kioskModeEnabled: boolean;
  // Photo Frames
  frameMode: 'off' | 'always' | 'available';
  selectedFrameId: string | null;
  availableFrameIds: string[];
  // Date/Time overlay
  dateOverlay: 'off' | 'date' | 'datetime';
  dateOverlayPosition: 'bottom-right' | 'bottom-left' | 'top-right' | 'top-left' | 'bottom-center';
  // Event text (shown in date sticker & welcome)
  eventText: string;
  // Continuous shooting / burst
  burstCount: number;        // 1 = single shot, 2–5 = burst
  burstIntervalSec: number;  // seconds between burst shots
  // Welcome screen text
  welcomeText: string;
}

const settingsFile = new File(Paths.document, 'settings.json');

const DEFAULT_SETTINGS: AppSettings = {
  countdownDuration: 3,
  printerIp: '192.168.1.100',
  adminPassword: '1234',
  kioskModeEnabled: false,
  frameMode: 'available',
  selectedFrameId: null,
  availableFrameIds: FRAMES.map(f => f.id),
  dateOverlay: 'off',
  dateOverlayPosition: 'bottom-right',
  eventText: '',
  burstCount: 1,
  burstIntervalSec: 5,
  welcomeText: 'Willkommen zu unserer Feier!',
};

/**
 * Load settings from persistent storage.
 */
export async function loadSettings(): Promise<AppSettings> {
  try {
    if (settingsFile.exists) {
      const content = await settingsFile.text();
      const parsed = JSON.parse(content);
      return { ...DEFAULT_SETTINGS, ...parsed };
    }
  } catch (e) {
    console.error('Failed to load settings, using defaults:', e);
  }
  return DEFAULT_SETTINGS;
}

/**
 * Save settings to persistent storage.
 */
export async function saveSettings(settings: AppSettings): Promise<void> {
  try {
    const content = JSON.stringify(settings, null, 2);
    await FileSystem.writeAsStringAsync(settingsFile.uri, content);
    console.log('Settings saved successfully:', content);
  } catch (e) {
    console.error('Failed to save settings:', e);
    throw e;
  }
}