// Apple Calendar OAuth wrapper
import { fetch } from 'undici'; // Using undici for HTTP requests

export interface AppleCalendarEvent {
  id: string;
  title: string;
  description?: string;
  startDate: string;
  endDate: string;
  location?: string;
  attendees?: Array<{
    email: string;
    name?: string;
  }>;
}

export interface AppleCalendar {
  id: string;
  title: string;
  isPrimary?: boolean;
}

/**
 * Initialize Apple Calendar OAuth client
 */
export const initializeOAuth = (clientId: string, clientSecret: string, redirectUri: string) => {
  // This would typically configure the OAuth client for Apple
  // For now, we'll just return the configuration data
  return {
    clientId,
    clientSecret,
    redirectUri,
    authorizationUrl: 'https://appleid.apple.com/auth/authorize',
    tokenUrl: 'https://appleid.apple.com/auth/token',
  };
};

/**
 * Get user calendar list using OAuth token
 */
export const getUserCalendars = async (
  clientConfig: any,
  accessToken: string
): Promise<AppleCalendar[]> => {
  try {
    // In a real implementation, this would make a request to Apple's calendar API
    // using the access token

    // Simulate real API call
    const response = await fetch(
      'https://api.apple.com/calendar/v1/calendars',
      {
        method: 'GET',
        headers: {
          'Authorization': `Bearer ${accessToken}`,
          'Content-Type': 'application/json',
        }
      }
    );

    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }

    const data = await response.json() as { calendars?: any[] };

    // Map to expected format
    return data.calendars?.map((item: any) => ({
      id: item.id,
      title: item.title,
      isPrimary: item.isPrimary
    })) || [];
  } catch (error) {
    console.error('Error fetching user calendars:', error);
    throw new Error('Failed to fetch user calendars');
  }
};

/**
 * Get upcoming events for a specified time period
 */
export const getUpcomingEvents = async (
  clientConfig: any,
  accessToken: string,
  calendarId: string,
  timeMin: string,
  timeMax: string
): Promise<AppleCalendarEvent[]> => {
  try {
    // In a real implementation, this would make a request to Apple's calendar API
    // using the access token and specified parameters

    // Simulate real API call
    const response = await fetch(
      `https://api.apple.com/calendar/v1/calendars/${calendarId}/events?start=${timeMin}&end=${timeMax}`,
      {
        method: 'GET',
        headers: {
          'Authorization': `Bearer ${accessToken}`,
          'Content-Type': 'application/json',
        }
      }
    );

    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }

    const data = await response.json() as { events?: any[] };

    // Map to expected format
    return data.events?.map((item: any) => ({
      id: item.id,
      title: item.title,
      description: item.description,
      startDate: item.startDate,
      endDate: item.endDate,
      location: item.location,
      attendees: item.attendees,
    })) || [];
  } catch (error) {
    console.error('Error fetching upcoming events:', error);
    throw new Error('Failed to fetch upcoming events');
  }
};