/**
 * 通用交互组合式函数，替代旧版全局 base mixin。
 * 用法：const { toast, showLoading, navigateBack } = useApp()
 */
export function useApp() {
  const toast = (title, duration = 2500) => {
    if (!title) return
    uni.showToast({
      icon: 'none',
      title: typeof title === 'string' ? title : '操作失败',
      duration
    })
  }

  const showLoading = (title = '加载中...') => {
    uni.showLoading({ mask: true, title })
  }

  const hideLoading = () => uni.hideLoading()

  /** 返回上一页，若已是首个页面则回到首页 tab */
  const navigateBack = (options) => {
    const pages = getCurrentPages()
    if (pages.length <= 1) {
      uni.switchTab({ url: '/pages/toolbox/toolbox' })
    } else {
      uni.navigateBack(options)
    }
  }

  return { toast, showLoading, hideLoading, navigateBack }
}