package base

// 对应协议的下载支持
type Fetcher interface {
	Setup(ctl Controller)
	// 解析请求
	Resolve(req *Request) (res *Resource, err error)
	// 创建任务
	Create(res *Resource, opts *Options) (err error)
	Start() (err error)
	Pause() (err error)
	Continue() (err error)

	// 获取任务下载进度
	Progress() Progress
	// 该方法会一直阻塞，直到任务下载结束
	Wait() (err error)
}

type DefaultFetcher struct {
	Ctl    Controller
	DoneCh chan error
}

func (f *DefaultFetcher) Setup(ctl Controller) {
	f.Ctl = ctl
	f.DoneCh = make(chan error, 1)
}

func (f *DefaultFetcher) Wait() (err error) {
	return <-f.DoneCh
}