package main

// 子系统1：文件读取
type FileReader struct{}
func (f *FileReader) Read(filePath string) string {
    return "file_data_from_" + filePath
}

// 子系统2：视频压缩
type VideoCompressor struct{}
func (v *VideoCompressor) Compress(data string) string {
    return data + "_compressed"
}

// 子系统3：格式转换
type FormatConverter struct{}
func (f *FormatConverter) Convert(data string) string {
    return data + "_to_mp4"
}

// 子系统4：云存储上传
type CloudUploader struct{}
func (c *CloudUploader) Upload(data string) string {
    return "uploaded_id_for_" + data
}

// 外观结构体：统一接口
type VideoUploadFacade struct {
    fileReader      *FileReader
    compressor      *VideoCompressor
    converter       *FormatConverter
    uploader        *CloudUploader
}

func NewVideoUploadFacade() *VideoUploadFacade {
    return &VideoUploadFacade{
        fileReader:      &FileReader{},
        compressor:      &VideoCompressor{},
        converter:       &FormatConverter{},
        uploader:        &CloudUploader{},
    }
}

// 简化后的高层方法
func (v *VideoUploadFacade) UploadAndProcess(filePath string) string {
    raw := v.fileReader.Read(filePath)
    compressed := v.compressor.Compress(raw)
    converted := v.converter.Convert(compressed)
    uploaded := v.uploader.Upload(converted)
    return uploaded
}

func main() {
    facade := NewVideoUploadFacade()
    result := facade.UploadAndProcess("my_video.*i")
    println(result) // 输出：uploaded_id_for_file_data_from_my_video.*i_compressed_to_mp4
}