import { Hono } from 'hono';
import { zValidator } from '@hono/zod-validator';
import { z } from 'zod';
import { db, dbGet, dbAll, events, tickets, payments, eventPaymentOverrides, emailLogs, invoices, siteSettings } from '../db/index.js';
import { eq, desc, and, gte, sql } from 'drizzle-orm';
import { requireAuth, getAuthUser } from '../lib/auth.js';
import { generateId, getNow, convertBooleansForDb, toDbDate, calculateAvailableSeats } from '../lib/utils.js';
import { revalidateFrontendCache } from '../lib/revalidate.js';

interface UserContext {
  id: string;
  email: string;
  name: string;
  role: string;
}

const eventsRouter = new Hono<{ Variables: { user: UserContext } }>();

// Helper to normalize event data for API response
// PostgreSQL decimal returns strings, booleans are stored as integers
function normalizeEvent(event: any) {
  if (!event) return event;
  return {
    ...event,
    // Convert price from string/decimal to clean number
    price: typeof event.price === 'string' ? parseFloat(event.price) : Number(event.price),
    // Convert capacity from string to number if needed
    capacity: typeof event.capacity === 'string' ? parseInt(event.capacity, 10) : Number(event.capacity),
    // Convert boolean integers to actual booleans for frontend
    externalBookingEnabled: Boolean(event.externalBookingEnabled),
  };
}

// Custom validation error handler
const validationHook = (result: any, c: any) => {
  if (!result.success) {
    const errors = result.error.issues.map((i: any) => `${i.path.join('.')}: ${i.message}`).join(', ');
    return c.json({ error: errors }, 400);
  }
};

// Helper to parse price from string (handles both "45000" and "41,44" formats)
const parsePrice = (val: unknown): number => {
  if (typeof val === 'number') return val;
  if (typeof val === 'string') {
    // Replace comma with dot for decimal parsing (European format)
    const normalized = val.replace(',', '.');
    const parsed = parseFloat(normalized);
    return isNaN(parsed) ? 0 : parsed;
  }
  return 0;
};

// Helper to normalize boolean (handles true/false and 0/1)
const normalizeBoolean = (val: unknown): boolean => {
  if (typeof val === 'boolean') return val;
  if (typeof val === 'number') return val !== 0;
  if (val === 'true') return true;
  if (val === 'false') return false;
  return false;
};

const baseEventSchema = z.object({
  title: z.string().min(1),
  titleEs: z.string().optional().nullable(),
  description: z.string().min(1),
  descriptionEs: z.string().optional().nullable(),
  shortDescription: z.string().max(300).optional().nullable(),
  shortDescriptionEs: z.string().max(300).optional().nullable(),
  startDatetime: z.string(),
  endDatetime: z.string().optional().nullable(),
  location: z.string().min(1),
  locationUrl: z.string().url().optional().nullable().or(z.literal('')),
  // Accept price as number or string (handles "45000" and "41,44" formats)
  price: z.union([z.number(), z.string()]).transform(parsePrice).pipe(z.number().min(0)).default(0),
  currency: z.string().default('PYG'),
  capacity: z.union([z.number(), z.string()]).transform((val) => typeof val === 'string' ? parseInt(val, 10) || 50 : val).pipe(z.number().min(1)).default(50),
  status: z.enum(['draft', 'published', 'unlisted', 'cancelled', 'completed', 'archived']).default('draft'),
  // Accept relative paths (/uploads/...) or full URLs
  bannerUrl: z.string().optional().nullable().or(z.literal('')),
  // External booking support - accept boolean or number (0/1 from DB)
  externalBookingEnabled: z.union([z.boolean(), z.number()]).transform(normalizeBoolean).default(false),
  externalBookingUrl: z.string().url().optional().nullable().or(z.literal('')),
});

const createEventSchema = baseEventSchema.refine(
  (data) => {
    // If external booking is enabled, URL must be provided and must start with https://
    if (data.externalBookingEnabled) {
      return !!(data.externalBookingUrl && data.externalBookingUrl.startsWith('https://'));
    }
    return true;
  },
  {
    message: 'External booking URL is required and must be a valid HTTPS link when external booking is enabled',
    path: ['externalBookingUrl'],
  }
);

const updateEventSchema = baseEventSchema.partial().refine(
  (data) => {
    // If external booking is enabled, URL must be provided and must start with https://
    if (data.externalBookingEnabled) {
      return !!(data.externalBookingUrl && data.externalBookingUrl.startsWith('https://'));
    }
    return true;
  },
  {
    message: 'External booking URL is required and must be a valid HTTPS link when external booking is enabled',
    path: ['externalBookingUrl'],
  }
);

// Get all events (public)
eventsRouter.get('/', async (c) => {
  const status = c.req.query('status');
  const upcoming = c.req.query('upcoming');
  
  let query = (db as any).select().from(events);
  
  if (status) {
    query = query.where(eq((events as any).status, status));
  }
  
  if (upcoming === 'true') {
    const now = getNow();
    query = query.where(
      and(
        eq((events as any).status, 'published'),
        gte((events as any).startDatetime, now)
      )
    );
  }
  
  const result = await dbAll(query.orderBy(desc((events as any).startDatetime)));
  
  // Get ticket counts for each event
  const eventsWithCounts = await Promise.all(
    result.map(async (event: any) => {
      // Count confirmed AND checked_in tickets (checked_in were previously confirmed)
      // This ensures check-in doesn't affect capacity/spots_left
      const ticketCount = await dbGet<any>(
        (db as any)
          .select({ count: sql<number>`count(*)` })
          .from(tickets)
          .where(
            and(
              eq((tickets as any).eventId, event.id),
              sql`${(tickets as any).status} IN ('confirmed', 'checked_in')`
            )
          )
      );
      
      const normalized = normalizeEvent(event);
      const bookedCount = ticketCount?.count || 0;
      return {
        ...normalized,
        bookedCount,
        availableSeats: calculateAvailableSeats(normalized.capacity, bookedCount),
      };
    })
  );
  
  return c.json({ events: eventsWithCounts });
});

// Get single event (public)
eventsRouter.get('/:id', async (c) => {
  const id = c.req.param('id');
  
  const event = await dbGet<any>(
    (db as any).select().from(events).where(eq((events as any).id, id))
  );
  
  if (!event) {
    return c.json({ error: 'Event not found' }, 404);
  }
  
  // Count confirmed AND checked_in tickets (checked_in were previously confirmed)
  // This ensures check-in doesn't affect capacity/spots_left
  const ticketCount = await dbGet<any>(
    (db as any)
      .select({ count: sql<number>`count(*)` })
      .from(tickets)
      .where(
        and(
          eq((tickets as any).eventId, id),
          sql`${(tickets as any).status} IN ('confirmed', 'checked_in')`
        )
      )
  );
  
  const normalized = normalizeEvent(event);
  const bookedCount = ticketCount?.count || 0;
  return c.json({
    event: {
      ...normalized,
      bookedCount,
      availableSeats: calculateAvailableSeats(normalized.capacity, bookedCount),
    },
  });
});

// Helper function to get ticket count for an event
async function getEventTicketCount(eventId: string): Promise<number> {
  const ticketCount = await dbGet<any>(
    (db as any)
      .select({ count: sql<number>`count(*)` })
      .from(tickets)
      .where(
        and(
          eq((tickets as any).eventId, eventId),
          sql`${(tickets as any).status} IN ('confirmed', 'checked_in')`
        )
      )
  );
  return ticketCount?.count || 0;
}

// Get next upcoming event (public) - returns featured event if valid, otherwise next upcoming
eventsRouter.get('/next/upcoming', async (c) => {
  const now = getNow();
  const nowMs = Date.now();
  
  // First, check if there's a featured event in site settings
  const settings = await dbGet<any>(
    (db as any).select().from(siteSettings).limit(1)
  );
  
  let featuredEvent = null;
  let shouldUnsetFeatured = false;
  
  if (settings?.featuredEventId) {
    featuredEvent = await dbGet<any>(
      (db as any)
        .select()
        .from(events)
        .where(eq((events as any).id, settings.featuredEventId))
    );
    
    if (featuredEvent) {
      const eventEndTime = featuredEvent.endDatetime || featuredEvent.startDatetime;
      const isPublished = featuredEvent.status === 'published';
      const hasNotEnded = new Date(eventEndTime).getTime() > nowMs;
      
      if (!isPublished || !hasNotEnded) {
        shouldUnsetFeatured = true;
        featuredEvent = null;
      }
    } else {
      shouldUnsetFeatured = true;
    }
  }
  
  if (shouldUnsetFeatured && settings) {
    try {
      await (db as any)
        .update(siteSettings)
        .set({ featuredEventId: null, updatedAt: now })
        .where(eq((siteSettings as any).id, settings.id));
      console.log('Featured event auto-cleared (event ended or unpublished)');
      revalidateFrontendCache();
    } catch (err: any) {
      console.error('Failed to clear featured event:', err);
    }
  }
  
  // If we have a valid featured event, return it
  if (featuredEvent) {
    const bookedCount = await getEventTicketCount(featuredEvent.id);
    const normalized = normalizeEvent(featuredEvent);
    return c.json({
      event: {
        ...normalized,
        bookedCount,
        availableSeats: calculateAvailableSeats(normalized.capacity, bookedCount),
        isFeatured: true,
      },
    });
  }
  
  // Fallback: get the next upcoming published event
  const event = await dbGet<any>(
    (db as any)
      .select()
      .from(events)
      .where(
        and(
          eq((events as any).status, 'published'),
          gte((events as any).startDatetime, now)
        )
      )
      .orderBy((events as any).startDatetime)
      .limit(1)
  );
  
  if (!event) {
    return c.json({ event: null });
  }
  
  const bookedCount = await getEventTicketCount(event.id);
  const normalized = normalizeEvent(event);
  return c.json({
    event: {
      ...normalized,
      bookedCount,
      availableSeats: calculateAvailableSeats(normalized.capacity, bookedCount),
      isFeatured: false,
    },
  });
});

// Create event (admin/organizer only)
eventsRouter.post('/', requireAuth(['admin', 'organizer']), zValidator('json', createEventSchema, validationHook), async (c) => {
  const data = c.req.valid('json');
  const user = c.get('user');
  const now = getNow();
  const id = generateId();
  
  // Convert data for database compatibility
  const dbData = convertBooleansForDb(data);
  
  const newEvent = {
    id,
    ...dbData,
    startDatetime: toDbDate(data.startDatetime),
    endDatetime: data.endDatetime ? toDbDate(data.endDatetime) : null,
    createdAt: now,
    updatedAt: now,
  };
  
  await (db as any).insert(events).values(newEvent);
  
  // Revalidate sitemap when a new event is created
  revalidateFrontendCache();
  
  // Return normalized event data
  return c.json({ event: normalizeEvent(newEvent) }, 201);
});

// Update event (admin/organizer only)
eventsRouter.put('/:id', requireAuth(['admin', 'organizer']), zValidator('json', updateEventSchema, validationHook), async (c) => {
  const id = c.req.param('id');
  const data = c.req.valid('json');
  
  const existing = await dbGet(
    (db as any).select().from(events).where(eq((events as any).id, id))
  );
  if (!existing) {
    return c.json({ error: 'Event not found' }, 404);
  }
  
  const now = getNow();
  // Convert data for database compatibility
  const updateData: Record<string, any> = { ...convertBooleansForDb(data), updatedAt: now };
  // Convert datetime fields if present
  if (data.startDatetime) {
    updateData.startDatetime = toDbDate(data.startDatetime);
  }
  if (data.endDatetime !== undefined) {
    updateData.endDatetime = data.endDatetime ? toDbDate(data.endDatetime) : null;
  }
  
  await (db as any)
    .update(events)
    .set(updateData)
    .where(eq((events as any).id, id));
  
  const updated = await dbGet(
    (db as any).select().from(events).where(eq((events as any).id, id))
  );
  
  // Revalidate sitemap when an event is updated (status/dates may have changed)
  revalidateFrontendCache();
  
  return c.json({ event: normalizeEvent(updated) });
});

// Delete event (admin only)
eventsRouter.delete('/:id', requireAuth(['admin']), async (c) => {
  const id = c.req.param('id');
  
  const existing = await dbGet(
    (db as any).select().from(events).where(eq((events as any).id, id))
  );
  if (!existing) {
    return c.json({ error: 'Event not found' }, 404);
  }
  
  // Get all tickets for this event
  const eventTickets = await dbAll<any>(
    (db as any)
      .select()
      .from(tickets)
      .where(eq((tickets as any).eventId, id))
  );
  
  // Delete invoices and payments for all tickets of this event
  for (const ticket of eventTickets) {
    // Get payments for this ticket
    const ticketPayments = await dbAll<any>(
      (db as any)
        .select()
        .from(payments)
        .where(eq((payments as any).ticketId, ticket.id))
    );
    
    // Delete invoices for each payment
    for (const payment of ticketPayments) {
      await (db as any).delete(invoices).where(eq((invoices as any).paymentId, payment.id));
    }
    
    // Delete payments for this ticket
    await (db as any).delete(payments).where(eq((payments as any).ticketId, ticket.id));
  }
  
  // Delete all tickets for this event
  await (db as any).delete(tickets).where(eq((tickets as any).eventId, id));
  
  // Delete event payment overrides
  await (db as any).delete(eventPaymentOverrides).where(eq((eventPaymentOverrides as any).eventId, id));
  
  // Set eventId to null on email logs (they reference this event but can exist without it)
  await (db as any)
    .update(emailLogs)
    .set({ eventId: null })
    .where(eq((emailLogs as any).eventId, id));
  
  // Finally delete the event
  await (db as any).delete(events).where(eq((events as any).id, id));
  
  // Revalidate sitemap when an event is deleted
  revalidateFrontendCache();
  
  return c.json({ message: 'Event deleted successfully' });
});

// Get event attendees (admin/organizer only)
eventsRouter.get('/:id/attendees', requireAuth(['admin', 'organizer', 'staff']), async (c) => {
  const id = c.req.param('id');
  
  const attendees = await dbAll(
    (db as any)
      .select()
      .from(tickets)
      .where(eq((tickets as any).eventId, id))
  );
  
  return c.json({ attendees });
});

// Duplicate event (admin/organizer only)
eventsRouter.post('/:id/duplicate', requireAuth(['admin', 'organizer']), async (c) => {
  const id = c.req.param('id');
  
  const existing = await dbGet<any>(
    (db as any).select().from(events).where(eq((events as any).id, id))
  );
  if (!existing) {
    return c.json({ error: 'Event not found' }, 404);
  }
  
  const now = getNow();
  const newId = generateId();
  
  // Create a copy with modified title and draft status
  const duplicatedEvent = {
    id: newId,
    title: `${existing.title} (Copy)`,
    titleEs: existing.titleEs ? `${existing.titleEs} (Copia)` : null,
    description: existing.description,
    descriptionEs: existing.descriptionEs,
    shortDescription: existing.shortDescription,
    shortDescriptionEs: existing.shortDescriptionEs,
    startDatetime: existing.startDatetime, // Already in DB format from existing record
    endDatetime: existing.endDatetime,
    location: existing.location,
    locationUrl: existing.locationUrl,
    price: existing.price,
    currency: existing.currency,
    capacity: existing.capacity,
    status: 'draft',
    bannerUrl: existing.bannerUrl,
    externalBookingEnabled: existing.externalBookingEnabled ?? 0, // Already in DB format (0/1)
    externalBookingUrl: existing.externalBookingUrl,
    createdAt: now,
    updatedAt: now,
  };
  
  await (db as any).insert(events).values(duplicatedEvent);
  
  return c.json({ event: normalizeEvent(duplicatedEvent), message: 'Event duplicated successfully' }, 201);
});

export default eventsRouter;