import Fastify, { FastifyInstance } from 'fastify'
import Database from 'better-sqlite3'
import type { Config } from './config.js'

declare module 'fastify' {
  interface FastifyInstance {
    db: Database.Database
    config: Config
    fetchImpl: typeof fetch
  }
}

export interface AppOptions {
  db: Database.Database
  config: Config
  fetchImpl?: typeof fetch
}

export async function buildApp(opts: AppOptions): Promise<FastifyInstance> {
  const app = Fastify({ logger: false })
  app.decorate('db', opts.db)
  app.decorate('config', opts.config)
  app.decorate('fetchImpl', opts.fetchImpl ?? fetch)
  app.get('/api/health', async () => ({ ok: true }))
  return app
}