// i18n工具函数 - 用于在 Vue 3 setup 中安全获取 $t
import { getCurrentInstance } from 'vue'
import zhCN from '../locale/zh-CN.js'
import enUS from '../locale/en-US.js'
import idID from '../locale/id-ID.js'

const MESSAGE_MAP = {
  'zh-CN': zhCN,
  'en-US': enUS,
  'id-ID': idID
}
const LANGUAGE_STORAGE_KEY = 'language'

export function getAppLocale() {
  try {
    const lang = uni.getStorageSync(LANGUAGE_STORAGE_KEY)
    if (lang && MESSAGE_MAP[lang]) return lang
  } catch (_) {}
  return 'zh-CN'
}

function lookupMessage(locale, key) {
  const segments = String(key).split('.')
  let node = MESSAGE_MAP[locale]
  for (const seg of segments) {
    if (node == null || typeof node !== 'object') return null
    node = node[seg]
  }
  return typeof node === 'string' ? node : null
}

/** 非 Vue 组件场景下的文案翻译 */
export function translate(key, values) {
  const locale = getAppLocale()
  let text = lookupMessage(locale, key) ?? lookupMessage('zh-CN', key) ?? key
  if (values && typeof values === 'object') {
    Object.entries(values).forEach(([k, v]) => {
      text = text.split(`{${k}}`).join(String(v))
    })
  }
  return text
}

/** uni.showModal 封装：默认使用多语言取消/确认按钮 */
export function showModalI18n(options = {}) {
  const { cancelText, confirmText, showCancel = true, ...rest } = options
  const modalOptions = {
    ...rest,
    showCancel,
    confirmText: confirmText ?? translate('common.confirm')
  }
  if (showCancel !== false) {
    modalOptions.cancelText = cancelText ?? translate('common.cancel')
  }
  return uni.showModal(modalOptions)
}

/**
 * 在 setup 中使用 i18n
 * @returns {{ t: Function, locale: string, i18n: object }}
 */
export function useI18n() {
  const instance = getCurrentInstance()
  
  if (!instance || !instance.proxy) {
    return {
      t: (key) => key,
      locale: 'en_US',
      i18n: null
    }
  }
  
  const proxy = instance.proxy
  
  // 返回一个函数，每次调用时动态获取 $t（确保 $t 已经注入）
  return {
    t: (key, ...args) => {
      if (proxy.$t && typeof proxy.$t === 'function') {
        return proxy.$t(key, ...args)
      }
      return key
    },
    locale: proxy.$i18n?.locale || 'en_US',
    i18n: proxy.$i18n
  }
}