package cmd

import (
	"context"
	"fmt"
	"io"
)

// Writes to multiple writers
type multiWriter struct {
	writers     []io.Writer
	writeQuorum int
	errs        []error
}

// Write writes data to writers.
func (p *multiWriter) Write(ctx context.Context, blocks [][]byte) error {
	for i := range p.writers {
		if p.errs[i] != nil {
			continue
		}

				if derr == nil {
					derr = err
				}
			}
		} else if err != nil {
			return err
		}

		if err = e.DecodeDataAndParityBlocks(ctx, bufs); err != nil {
			return err
		}

		w := multiWriter{
			writers:     writers,
			writeQuorum: 1,
			errs:        make([]error, len(writers)),
		}

		if err = w.Write(ctx, bufs); err != nil {
			return err
		}
	}

	return derr

			buf.Reset()
			bytebufferpool.Put(buf)
		}()

		md5w := md5.New()

		// Maximum allowed fan-out object size.
		const maxFanOutSize = 16 << 20

		n, err := io.Copy(io.MultiWriter(buf, md5w), ioutil.HardLimitReader(pReader, maxFanOutSize))
		if err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}

		// Set the correct hex md5sum for the fan-out stream.