import { langEvent } from '@cloudbase/utilities'

export enum LANGS {
  ZH = 'zh-CN',
  EN = 'en-US',
}

export const LANG_HEADER_KEY = 'Accept-Language'

export const langMap = {
  [LANGS.EN]: {
    '请检查调用方式，或前往云开发 AI+ 首页查看文档':
      'Please check the calling method or visit the AI+ homepage to view the documentation',
    'AI+ 请求出错，错误码': 'AI+ request error, error code',
    错误信息: 'error message',
    未实现: 'not implemented',
    '小程序不支持 wasm 加载': 'wasm loading is not supported in mini programs',
    '小程序不支持动态 js 加载': 'dynamic js loading is not supported in mini programs',
    请求超时: 'request timeout',
    '缺少 privatelink sdk 地址': 'missing privatelink sdk address',
  },
}

export const t = (text: string, lang: LANGS) => langMap[lang]?.[text] || text

const getLangCacheKey = config => `lang_${config.clientId || config.env}`

export const i18nProxy = (platform, config) => {
  const cacheKey = getLangCacheKey(config)
  const { localStorage } = platform.adapter || {}
  const lang = config.lang || localStorage?.getItem?.(cacheKey) || LANGS.ZH
  localStorage?.setItem?.(cacheKey, lang)

  return new Proxy(
    {
      t: (text: string) => t(text, lang),
      LANG_HEADER_KEY,
      lang,
    },
    {
      get(target, prop) {
        if (prop === 'lang') {
          return localStorage?.getItem?.(cacheKey) || target[prop]
        }
        return target[prop]
      },
      set(target, prop, newValue) {
        if (prop === 'lang' && newValue !== target[prop]) {
          target[prop] = newValue
          target.t = (text: string) => t(text, newValue)
          localStorage?.setItem?.(cacheKey, newValue)
          langEvent.bus.fire(langEvent.LANG_CHANGE_EVENT, { i18n: target })
        }

        target[prop] = newValue

        return true
      },
    },
  )
}