import dayjs from 'dayjs'
class Utils {
  //存数据进sessionStroage中
  setKey(key: string, value: any) {
    sessionStorage.setItem(key, JSON.stringify(value))
  }
  //从sessionStroage中拿数据
  getKey(key: string) {
    if (sessionStorage.getItem(key)) {
      return JSON.parse(sessionStorage.getItem(key) as string)
    }
  }
  //删除
  removeKey(key: string) {
    sessionStorage.removeItem(key)
  }
  //清空
  clear() {
    sessionStorage.clear()
  }

  //处理时间
  formatTime(time: number) {
    return dayjs(time).format('YYYY-MM-DD HH:mm:ss')
  }

  //深拷贝
  deepClone(obj: Record<string | number, any>) {
    const newObj: Record<string | number, any> = obj instanceof Array ? [] : {}
    for (const key in obj) {
      if (typeof obj[key] !== 'object') {
        newObj[key] = obj[key]
      } else {
        newObj[key] = this.deepClone(obj[key])
      }
    }
    return newObj
  }
  //柯里化函数
  curry(fn: (...args: any[]) => any) {
    return function cur1(this: unknown, ...args: any[]) {
      if (fn.length <= args.length) {
        return fn.apply(this, args)
      }
      return function cur2(this: unknown, ...args2: any[]) {
        return cur1.apply(this, [...args, args2])
      }
    }
  }
  //防抖
  debounce<T>(cb: (...args: any[]) => T, delay: number) {
    let timer: NodeJS.Timeout | null
    return function (this: unknown, ...args: any[]) {
      return new Promise<T>((resolve, reject) => {
        try {
          if (timer) {
            clearTimeout(timer)
            timer = null
            return
          }
          timer = setTimeout(() => {
            const res = cb.apply(this, args)
            resolve(res)
            clearTimeout(timer as NodeJS.Timeout)
            timer = null
          }, delay)
        } catch (error) {
          reject(error)
        }
      })
    }
  }

  //节流
  throttle<T = any>(cb: (...args: any[]) => T, delay: number, { tailing = false } = {}) {
    let startTime = 0
    let timer: NodeJS.Timeout | null = null
    return function (this: unknown, ...args: any[]) {
      return new Promise<T>((resolve, reject) => {
        try {
          const nowTime = new Date().getTime()
          if (delay <= nowTime - startTime) {
            const res = cb.apply(this, args)
            resolve(res)
            startTime = nowTime
            timer && clearTimeout(timer)
            timer = null
            return
          }
          //最后一次是否执行
          if (tailing && !timer) {
            const interval = delay - (nowTime - startTime)
            timer = setTimeout(() => {
              const res = cb.apply(this, args)
              resolve(res)
              startTime = new Date().getTime()
              clearTimeout(timer as NodeJS.Timeout)
              timer = null
            }, interval)
          }
        } catch (error) {
          reject(error)
        }
      })
    }
  }

  //在线资源的显示
  onlineResource(id: number, baseUrl: string = import.meta.env.VITE_BASE_URL) {
    return `${baseUrl}/?id=${id}`
  }

  //处理下载
  download(id: number, baseUrl: string = import.meta.env.VITE_BASE_URL) {
    const url = this.onlineResource(id, baseUrl)
    if ('download' in document.createElement('a')) {
      // 非IE下载
      const elink = document.createElement('a')
      // elink.download = 'aaa'
      elink.href = url
      // elink.target = '_blank'
      document.body.appendChild(elink)
      elink.click()
      // URL.revokeObjectURL(elink.href) // 释放URL对象
      document.body.removeChild(elink)
    }
  }
}

export default new Utils()