/**
 * Notifications Routes – List, create, mark read, delete notifications
 */
import type { FastifyInstance } from 'fastify';
import type { DatabaseInterface } from '../database/DatabaseInterface.js';
import type { AuthService } from '../auth/AuthService.js';
import { validateIdParam } from '../utils/validation.js';

function extractToken(request: any): string | null {
  const auth = request.headers?.authorization;
  if (auth && auth.startsWith('Bearer ')) return auth.slice(7);
  return null;
}

export function registerNotificationRoutes(fastify: FastifyInstance, db: DatabaseInterface, authService: AuthService) {
  // List notifications for current user
  fastify.get('/api/notifications', async (request, reply) => {
    const token = extractToken(request);
    if (!token) return reply.code(401).send({ error: 'Authentication required' });
    const user = authService.getUserFromSession(token);
    if (!user) return reply.code(401).send({ error: 'Invalid or expired session' });
    return db.listNotifications(user.id);
  });

  // Create notification (only for self)
  fastify.post('/api/notifications', async (request, reply) => {
    const token = extractToken(request);
    if (!token) return reply.code(401).send({ error: 'Authentication required' });
    const user = authService.getUserFromSession(token);
    if (!user) return reply.code(401).send({ error: 'Invalid or expired session' });
    const body = request.body as { type?: string; title?: string; message?: string };
    if (!body.title || !body.message) return reply.code(400).send({ error: 'title and message are required' });
    const validTypes = ['info', 'share', 'warning', 'error'];
    const type = validTypes.includes(body.type ?? '') ? body.type! : 'info';
    return reply.code(201).send(db.createNotification({
      user_id: user.id,
      type,
      title: body.title,
      message: body.message,
    }));
  });

  // Mark notification as read (ownership check)
  fastify.patch('/api/notifications/:id/read', async (request, reply) => {
    const token = extractToken(request);
    if (!token) return reply.code(401).send({ error: 'Authentication required' });
    const user = authService.getUserFromSession(token);
    if (!user) return reply.code(401).send({ error: 'Invalid or expired session' });
    const { id } = request.params as { id: string };
    const idErr = validateIdParam(id, 'id');
    if (idErr) return reply.code(400).send({ error: idErr });
    const notif = db.getNotification(id);
    if (!notif) return reply.code(404).send({ error: 'Notification not found' });
    if (notif.user_id !== user.id) return reply.code(403).send({ error: 'Forbidden' });
    const ok = db.markNotificationRead(id);
    if (!ok) return reply.code(404).send({ error: 'Notification not found' });
    return reply.code(204).send();
  });

  // Delete notification (ownership check)
  fastify.delete('/api/notifications/:id', async (request, reply) => {
    const token = extractToken(request);
    if (!token) return reply.code(401).send({ error: 'Authentication required' });
    const user = authService.getUserFromSession(token);
    if (!user) return reply.code(401).send({ error: 'Invalid or expired session' });
    const { id } = request.params as { id: string };
    const idErr = validateIdParam(id, 'id');
    if (idErr) return reply.code(400).send({ error: idErr });
    const notif = db.getNotification(id);
    if (!notif) return reply.code(404).send({ error: 'Notification not found' });
    if (notif.user_id !== user.id) return reply.code(403).send({ error: 'Forbidden' });
    const ok = db.deleteNotification(id);
    if (!ok) return reply.code(404).send({ error: 'Notification not found' });
    return reply.code(204).send();
  });
}