/**
 * Layers Routes – CRUD for layers
 */
import type { FastifyInstance } from 'fastify';
import type { DatabaseInterface, DBLayer } from '../database/DatabaseInterface.js';
import { requireAuth } from '../auth/authMiddleware.js';
import type { AuthService } from '../auth/AuthService.js';
import { validateName, validateIdParam } from '../utils/validation.js';

export function registerLayerRoutes(fastify: FastifyInstance, db: DatabaseInterface, authService: AuthService) {
  // List layers for a drawing
  fastify.get('/api/drawings/:drawingId/layers', async (request, reply) => {
    if (!requireAuth(request, reply, authService)) return;
    const { drawingId } = request.params as { drawingId: string };
    const idErr = validateIdParam(drawingId, 'drawingId');
    if (idErr) return reply.code(400).send({ error: idErr });
    return db.listLayers(drawingId);
  });

  // Create layer
  fastify.post('/api/drawings/:drawingId/layers', async (request, reply) => {
    if (!requireAuth(request, reply, authService)) return;
    const { drawingId } = request.params as { drawingId: string };
    const idErr = validateIdParam(drawingId, 'drawingId');
    if (idErr) return reply.code(400).send({ error: idErr });
    const body = request.body as Partial<DBLayer>;
    if (body.name !== undefined) {
      const nameErr = validateName(body.name);
      if (nameErr) return reply.code(400).send({ error: nameErr });
    }
    return reply.code(201).send(db.createLayer({ ...body, drawing_id: drawingId }));
  });

  // Update layer
  fastify.patch('/api/layers/:id', async (request, reply) => {
    if (!requireAuth(request, reply, authService)) return;
    const { id } = request.params as { id: string };
    const idErr = validateIdParam(id, 'id');
    if (idErr) return reply.code(400).send({ error: idErr });
    const body = request.body as Partial<DBLayer>;
    if (body.name !== undefined) {
      const nameErr = validateName(body.name);
      if (nameErr) return reply.code(400).send({ error: nameErr });
    }
    const updated = db.updateLayer(id, body);
    if (!updated) return reply.code(404).send({ error: 'Layer not found' });
    return updated;
  });

  // Delete layer
  fastify.delete('/api/layers/:id', async (request, reply) => {
    if (!requireAuth(request, reply, authService)) return;
    const { id } = request.params as { id: string };
    const idErr = validateIdParam(id, 'id');
    if (idErr) return reply.code(400).send({ error: idErr });
    const ok = db.deleteLayer(id);
    if (!ok) return reply.code(404).send({ error: 'Layer not found' });
    return reply.code(204).send();
  });
}