// server/utils/nocodb-events.ts
import type { Event, EventRSVP, EventsResponse, EventFilters } from '~/utils/types';

/**
 * Creates a client for interacting with the Events NocoDB table
 * Provides CRUD operations and specialized queries for events and RSVPs
 */
export function createNocoDBEventsClient() {
  const config = useRuntimeConfig();
  
  const baseUrl = config.nocodb.url;
  const token = config.nocodb.token;
  const eventsBaseId = config.nocodb.eventsBaseId;
  const eventsTableId = config.nocodb.eventsTableId || 'events'; // fallback to table name
  
  if (!baseUrl || !token || !eventsBaseId) {
    throw new Error('Events NocoDB configuration is incomplete. Please check environment variables.');
  }

  const headers = {
    'xc-token': token,
    'Content-Type': 'application/json'
  };

  const eventsClient = {
    /**
     * Find all events with optional filtering
     */
    async findAll(filters?: EventFilters & { limit?: number; offset?: number }) {
      const queryParams = new URLSearchParams();
      
      if (filters?.limit) queryParams.set('limit', filters.limit.toString());
      if (filters?.offset) queryParams.set('offset', filters.offset.toString());
      
      // Build where clause for filtering
      const whereConditions: string[] = [];
      
      if (filters?.start_date && filters?.end_date) {
        whereConditions.push(`(start_datetime >= '${filters.start_date}' AND start_datetime <= '${filters.end_date}')`);
      }
      
      if (filters?.event_type) {
        whereConditions.push(`(event_type = '${filters.event_type}')`);
      }
      
      if (filters?.visibility) {
        whereConditions.push(`(visibility = '${filters.visibility}')`);
      } else if (filters?.user_role) {
        // Role-based visibility filtering
        if (filters.user_role === 'user') {
          whereConditions.push(`(visibility = 'public')`);
        } else if (filters.user_role === 'board') {
          whereConditions.push(`(visibility = 'public' OR visibility = 'board-only')`);
        }
        // Admin sees all events (no filter)
      }
      
      if (filters?.status) {
        whereConditions.push(`(status = '${filters.status}')`);
      } else {
        // Default to active events only
        whereConditions.push(`(status = 'active')`);
      }
      
      if (filters?.search) {
        whereConditions.push(`(title LIKE '%${filters.search}%' OR description LIKE '%${filters.search}%')`);
      }
      
      if (whereConditions.length > 0) {
        queryParams.set('where', whereConditions.join(' AND '));
      }
      
      // Sort by start date
      queryParams.set('sort', 'start_datetime');

      const url = `${baseUrl}/api/v1/db/data/v1/${eventsBaseId}/${eventsTableId}?${queryParams.toString()}`;
      
      const response = await $fetch(url, {
        method: 'GET',
        headers
      });
      
      return response;
    },

    /**
     * Find a single event by ID
     */
    async findOne(id: string) {
      const url = `${baseUrl}/api/v1/db/data/v1/${eventsBaseId}/${eventsTableId}/${id}`;
      
      return await $fetch<Event>(url, {
        method: 'GET',
        headers
      });
    },

    /**
     * Create a new event
     */
    async create(eventData: Partial<Event>) {
      const url = `${baseUrl}/api/v1/db/data/v1/${eventsBaseId}/${eventsTableId}`;
      
      // Set default values
      const data = {
        ...eventData,
        status: eventData.status || 'active',
        created_at: new Date().toISOString(),
        updated_at: new Date().toISOString()
      };
      
      return await $fetch<Event>(url, {
        method: 'POST',
        headers,
        body: data
      });
    },

    /**
     * Update an existing event
     */
    async update(id: string, eventData: Partial<Event>) {
      const url = `${baseUrl}/api/v1/db/data/v1/${eventsBaseId}/${eventsTableId}/${id}`;
      
      const data = {
        ...eventData,
        updated_at: new Date().toISOString()
      };
      
      return await $fetch<Event>(url, {
        method: 'PATCH',
        headers,
        body: data
      });
    },

    /**
     * Delete an event
     */
    async delete(id: string) {
      const url = `${baseUrl}/api/v1/db/data/v1/${eventsBaseId}/${eventsTableId}/${id}`;
      
      return await $fetch(url, {
        method: 'DELETE',
        headers
      });
    },

    /**
     * Create an RSVP record for an event
     */
    async createRSVP(rsvpData: Partial<EventRSVP>) {
      const url = `${baseUrl}/api/v1/db/data/v1/${eventsBaseId}/${eventsTableId}`;
      
      const data = {
        ...rsvpData,
        created_at: new Date().toISOString(),
        updated_at: new Date().toISOString()
      };
      
      return await $fetch<EventRSVP>(url, {
        method: 'POST',
        headers,
        body: data
      });
    },

    /**
     * Find RSVPs for a specific event
     */
    async findEventRSVPs(eventId: string) {
      const queryParams = new URLSearchParams();
      queryParams.set('where', `(event_id = '${eventId}')`);
      queryParams.set('sort', 'created_at');

      const url = `${baseUrl}/api/v1/db/data/v1/${eventsBaseId}/${eventsTableId}?${queryParams.toString()}`;
      
      return await $fetch(url, {
        method: 'GET',
        headers
      });
    },

    /**
     * Find a user's RSVP for a specific event
     */
    async findUserRSVP(eventId: string, memberId: string) {
      const queryParams = new URLSearchParams();
      queryParams.set('where', `(event_id = '${eventId}' AND member_id = '${memberId}')`);
      queryParams.set('limit', '1');

      const url = `${baseUrl}/api/v1/db/data/v1/${eventsBaseId}/${eventsTableId}?${queryParams.toString()}`;
      
      const response = await $fetch(url, {
        method: 'GET',
        headers
      });
      
      return response?.list?.[0] || null;
    },

    /**
     * Update an RSVP record
     */
    async updateRSVP(id: string, rsvpData: Partial<EventRSVP>) {
      const url = `${baseUrl}/api/v1/db/data/v1/${eventsBaseId}/${eventsTableId}/${id}`;
      
      const data = {
        ...rsvpData,
        updated_at: new Date().toISOString()
      };
      
      return await $fetch<EventRSVP>(url, {
        method: 'PATCH',
        headers,
        body: data
      });
    },

    /**
     * Update event attendance count (for optimization)
     */
    async updateAttendeeCount(eventId: string, count: number) {
      const url = `${baseUrl}/api/v1/db/data/v1/${eventsBaseId}/${eventsTableId}/${eventId}`;
      
      return await $fetch(url, {
        method: 'PATCH',
        headers,
        body: {
          current_attendees: count.toString(),
          updated_at: new Date().toISOString()
        }
      });
    },

    /**
     * Get events for a specific user with their RSVP status
     */
    async findUserEvents(memberId: string, filters?: EventFilters) {
      // First get all visible events
      const events = await this.findAll(filters);
      
      if (!events.list || events.list.length === 0) {
        return { list: [], PageInfo: events.PageInfo };
      }
      
      // Get user's RSVPs for these events
      const eventIds = events.list.map((e: Event) => e.id);
      const rsvpQueryParams = new URLSearchParams();
      rsvpQueryParams.set('where', `(member_id = '${memberId}' AND event_id IN (${eventIds.map(id => `'${id}'`).join(',')}))`);
      
      const url = `${baseUrl}/api/v1/db/data/v1/${eventsBaseId}/${eventsTableId}?${rsvpQueryParams.toString()}`;
      
      const rsvps = await $fetch(url, {
        method: 'GET',
        headers
      });
      
      // Map RSVPs to events
      const rsvpMap = new Map();
      if (rsvps.list) {
        rsvps.list.forEach((rsvp: EventRSVP) => {
          rsvpMap.set(rsvp.event_id, rsvp);
        });
      }
      
      // Add RSVP information to events
      const eventsWithRSVP = events.list.map((event: Event) => ({
        ...event,
        user_rsvp: rsvpMap.get(event.id) || null
      }));
      
      return {
        list: eventsWithRSVP,
        PageInfo: events.PageInfo
      };
    },

    /**
     * Generate payment reference for RSVP
     */
    generatePaymentReference(memberId: string, date?: Date): string {
      const referenceDate = date || new Date();
      const dateString = referenceDate.toISOString().split('T')[0]; // YYYY-MM-DD
      return `EVT-${memberId}-${dateString}`;
    },

    /**
     * Check if event has reached capacity
     */
    async isEventFull(eventId: string): Promise<boolean> {
      const event = await this.findOne(eventId);
      
      if (!event.max_attendees) return false; // Unlimited capacity
      
      const maxAttendees = parseInt(event.max_attendees);
      const currentAttendees = event.current_attendees || 0;
      
      return currentAttendees >= maxAttendees;
    }
  };

  return eventsClient;
}

/**
 * Utility function to transform Event data for FullCalendar
 */
export function transformEventForCalendar(event: Event): any {
  const eventTypeColors = {
    'meeting': { bg: '#2196f3', border: '#1976d2' },
    'social': { bg: '#4caf50', border: '#388e3c' },
    'fundraiser': { bg: '#ff9800', border: '#f57c00' },
    'workshop': { bg: '#9c27b0', border: '#7b1fa2' },
    'board-only': { bg: '#a31515', border: '#8b1212' }
  };
  
  const colors = eventTypeColors[event.event_type as keyof typeof eventTypeColors] || 
    { bg: '#757575', border: '#424242' };

  return {
    id: event.id,
    title: event.title,
    start: event.start_datetime,
    end: event.end_datetime,
    backgroundColor: colors.bg,
    borderColor: colors.border,
    textColor: '#ffffff',
    extendedProps: {
      description: event.description,
      location: event.location,
      event_type: event.event_type,
      is_paid: event.is_paid === 'true',
      cost_members: event.cost_members,
      cost_non_members: event.cost_non_members,
      max_attendees: event.max_attendees ? parseInt(event.max_attendees) : null,
      current_attendees: event.current_attendees || 0,
      user_rsvp: event.user_rsvp,
      visibility: event.visibility,
      creator: event.creator,
      status: event.status
    }
  };
}