const fs = require('node:fs')
const vm = require('node:vm')
const { randomUUID } = require('node:crypto')
const vue = require('vue')

function memoryStorage() {
  const storage = Object.create(null)
  Object.defineProperties(storage, {
    getItem: { value: key => storage[key] ?? null },
    setItem: { value: (key, value) => { storage[key] = value } },
    removeItem: { value: key => { delete storage[key] } },
  })
  return storage
}

function createDraftHarness({ auth = vue.reactive({ user: { id: 'user-1' }, activeTenant: '1', profile: { id: 'profile-1' } }), storage = memoryStorage() } = {}) {
  const scope = vue.effectScope(), toasts = [], calls = []
  const context = vm.createContext({ ...vue, crypto: { randomUUID }, sessionStorage: storage,
    defineStore: (_, setup) => setup,
    useAuthStore: () => auth,
    useRuntimeConfig: () => ({ public: { apiBase: 'https://api.example.test' } }),
    useToast: () => ({ add: toast => toasts.push(toast) }),
    useNuxtApp: () => ({ $api: async (url, options) => { calls.push({ url, options }) } }),
  })
  const storeSource = fs.readFileSync(`${__dirname}/../../stores/temp.js`, 'utf8').replace(/^import .*$/mg, '').replace('export const', 'const')
  const store = scope.run(() => vm.runInContext(`${storeSource}\nuseTempStore()`, context))
  context.useTempStore = () => store
  const composable = fs.readFileSync(`${__dirname}/../../composables/useChatDraft.js`, 'utf8').replace('export function', 'function')
  vm.runInContext(composable, context)
  return { auth, storage, store, calls, toasts,
    useChatDraft: (key, options) => scope.run(() => context.useChatDraft(key, options)),
    close: () => scope.stop(),
  }
}

module.exports = { createDraftHarness, memoryStorage }