import type { FastifyInstance } from 'fastify';

import {
  CreateSubscriptionSchema,
  UpdateSubscriptionSchema,
  WEBHOOK_EVENT_TYPES,
} from './types.js';
import * as repo from './repository.js';
import { dispatchEvent } from './dispatcher.js';
import { extractAuth } from '../../lib/auth.js';
import { BadRequestError } from '@bytelyst/errors';

import { PRODUCT_ID } from '../../lib/product-config.js';

export async function webhookRoutes(app: FastifyInstance) {
  // Event types — must be before :id param route
  app.get('/webhooks/event-types', async (_req, reply) => {
    return reply.send({
      eventTypes: WEBHOOK_EVENT_TYPES.map(type => ({
        type,
        category: type.split('.')[0],
        action: type.split('.')[1],
      })),
    });
  });

  // Test — must be before :id param route
  app.post('/webhooks/test', async (req, reply) => {
    const auth = await extractAuth(req);
    const body = req.body as { subscriptionId?: string; eventType?: string };

    if (!body.subscriptionId) {
      throw new BadRequestError('subscriptionId is required');
    }

    await repo.getSubscription(body.subscriptionId, auth.sub);

    const eventType = (body.eventType || 'timer.fired') as (typeof WEBHOOK_EVENT_TYPES)[number];
    if (!WEBHOOK_EVENT_TYPES.includes(eventType)) {
      throw new BadRequestError(`Invalid event type: ${eventType}`);
    }

    const results = await dispatchEvent(
      auth.sub,
      PRODUCT_ID,
      eventType,
      {
        test: true,
        message: 'This is a test webhook event from ChronoMind',
        timestamp: new Date().toISOString(),
      },
      req.log
    );

    return reply.send({ results });
  });

  // List subscriptions
  app.get('/webhooks', async req => {
    const auth = await extractAuth(req);
    return repo.listSubscriptions(auth.sub, PRODUCT_ID);
  });

  // Get subscription
  app.get('/webhooks/:id', async req => {
    const auth = await extractAuth(req);
    const { id } = req.params as { id: string };
    return repo.getSubscription(id, auth.sub);
  });

  // Create subscription
  app.post('/webhooks', async (req, reply) => {
    const auth = await extractAuth(req);
    const parsed = CreateSubscriptionSchema.safeParse(req.body);
    if (!parsed.success) {
      throw new BadRequestError(parsed.error.issues.map(i => i.message).join('; '));
    }
    const id = crypto.randomUUID();
    const sub = await repo.createSubscription(id, auth.sub, PRODUCT_ID, parsed.data);
    return reply.status(201).send(sub);
  });

  // Update subscription
  app.put('/webhooks/:id', async req => {
    const auth = await extractAuth(req);
    const { id } = req.params as { id: string };
    const parsed = UpdateSubscriptionSchema.safeParse(req.body);
    if (!parsed.success) {
      throw new BadRequestError(parsed.error.issues.map(i => i.message).join('; '));
    }
    return repo.updateSubscription(id, auth.sub, parsed.data);
  });

  // Delete subscription
  app.delete('/webhooks/:id', async (req, reply) => {
    const auth = await extractAuth(req);
    const { id } = req.params as { id: string };
    await repo.deleteSubscription(id, auth.sub);
    return reply.status(204).send();
  });

  // List events for subscription
  app.get('/webhooks/:id/events', async req => {
    const auth = await extractAuth(req);
    const { id } = req.params as { id: string };
    // Verify ownership
    await repo.getSubscription(id, auth.sub);
    const limit = parseInt((req.query as Record<string, string>).limit || '50', 10);
    return repo.listEvents(id, Math.min(limit, 100));
  });

  // ── Zapier-compatible polling endpoint ─────────────────────
  // GET /webhooks/zapier/poll?eventType=timer.fired
  // Returns recent events for Zapier polling triggers
  app.get('/webhooks/zapier/poll', async req => {
    const auth = await extractAuth(req);
    const q = req.query as Record<string, string>;
    const eventType = q.eventType;
    if (!eventType || !WEBHOOK_EVENT_TYPES.includes(eventType as (typeof WEBHOOK_EVENT_TYPES)[number])) {
      throw new BadRequestError(`eventType query parameter must be one of: ${WEBHOOK_EVENT_TYPES.join(', ')}`);
    }
    const subs = await repo.listSubscriptions(auth.sub, PRODUCT_ID);
    const matching = subs.filter(s => s.events.includes(eventType as (typeof WEBHOOK_EVENT_TYPES)[number]));
    if (matching.length === 0) {
      return { items: [] };
    }
    // Return events from all matching subscriptions
    const allEvents = [];
    for (const sub of matching) {
      const events = await repo.listEvents(sub.id, 10);
      allEvents.push(...events);
    }
    // Sort by creation time descending
    allEvents.sort((a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime());
    return { items: allEvents.slice(0, 25) };
  });
}