import { defineStore } from 'pinia'
import { ref } from 'vue'
import i18n, { SUPPORTED_LOCALES, DEFAULT_LOCALE } from '../i18n/index.js'
import { getStorage, setStorage, LOCALE_KEY } from '../utils/storage.js'

export const useAppStore = defineStore('app', () => {
  const locale = ref(DEFAULT_LOCALE)

  /**
   * 切换语言，同步更新i18n并持久化到本地存储
   * @param {string} newLocale - 目标语言标识
   */
  function setLocale(newLocale) {
    if (!SUPPORTED_LOCALES.includes(newLocale)) {
      return
    }
    locale.value = newLocale
    i18n.global.locale.value = newLocale
    setStorage(LOCALE_KEY, newLocale)
  }

  /**
   * 初始化语言：优先从本地存储读取，否则根据系统语言匹配
   */
  function initLocale() {
    const savedLocale = getStorage(LOCALE_KEY)
    if (savedLocale && SUPPORTED_LOCALES.includes(savedLocale)) {
      setLocale(savedLocale)
      return
    }

    // 从系统语言推断
    let systemLocale = DEFAULT_LOCALE
    try {
      const systemInfo = uni.getSystemInfoSync()
      const lang = systemInfo.language || ''
      if (lang.startsWith('zh')) {
        // 区分简体和繁体
        systemLocale = lang.includes('TW') || lang.includes('HK') || lang.includes('Hant')
          ? 'zh-TW'
          : 'zh-CN'
      } else if (lang.startsWith('en')) {
        systemLocale = 'en'
      }
    } catch (e) {
      // 获取系统信息失败，使用默认语言
    }

    setLocale(systemLocale)
  }

  return {
    locale,
    setLocale,
    initLocale
  }
})