/**
 * Example: using backend-toolkit inside a Fastify app.
 *
 * Requires fastify to be installed separately:
 *   npm install fastify
 *
 * Run with: node examples/fastify.js
 */
const Fastify = require("fastify");
const { z } = require("zod");
const { success, error, validate, paginate, getPaginationParams, logger } = require("../src/index");

const fastify = Fastify();

const posts = [
  { id: 1, title: "Hello world" },
  { id: 2, title: "backend-toolkit" },
];

const createPostSchema = z.object({ title: z.string().min(1) });

fastify.post("/posts", async (request, reply) => {
  const result = validate(createPostSchema, request.body);

  if (!result.success) {
    return reply.status(400).send(error("Validation failed", 400, result.errors));
  }

  const post = { id: posts.length + 1, title: result.data.title };
  posts.push(post);

  return reply.status(201).send(success(post, "Post created", 201));
});

fastify.get("/posts", async (request) => {
  const { page, limit } = getPaginationParams(request.query);
  const meta = paginate({ page, limit, totalItems: posts.length });
  const items = posts.slice(meta.offset, meta.offset + meta.limit);

  return success({ items, meta }, "Posts fetched");
});

fastify.get("/posts/:id", async (request, reply) => {
  const post = posts.find((p) => String(p.id) === request.params.id);

  if (!post) {
    return reply.status(404).send(error("Post not found", 404));
  }

  return success(post, "Post fetched");
});

const port = process.env.PORT || 3001;
fastify
  .listen({ port })
  .then(() => logger.info(`Example app listening on port ${port}`))
  .catch((err) => {
    logger.error(err.message);
    process.exit(1);
  });