package grid

import (
	"bytes"
	"encoding/json"
	"errors"
	"math"
	"net/url"
	"sort"
	"strings"
	"sync"

	"github.com/tinylib/msgp/msgp"
)

// Recycler will override the internal reuse in typed handlers.
// When this is supported, the handler will not do internal pooling of objects,
// call Recycle() when the object is no longer needed.
// The recycler should handle nil pointers.
type Recycler interface {

	} else {
		z.updateRebalanceStats(ctx)
	}
	z.rebalMu.Unlock()

	return nil
}

// updates rebalance.bin from let's say 2 pool setup in the middle
// of a rebalance, was expanded can cause z.rebalMeta to be outdated
// due to a missing new pool. This function tries to handle this
// scenario, albeit rare it seems to have occurred in the wild.
//
// since we do not explicitly disallow it, but it is okay for them

		}
		return v.Msg, v.Err
	case <-ctx.Done():
		if debugReqs {
			return nil, fmt.Errorf("%d %s ERR: %w", m.MuxID, m.parent.String(), context.Cause(ctx))
		}
		return nil, context.Cause(ctx)
	}
}

// send the message. msg.Seq and msg.MuxID will be set
func (m *muxClient) send(msg message) error {
	m.respMu.Lock()
	defer m.respMu.Unlock()
	if m.closed {

		} else {
			if o.pool < len(z.serverPools) && o.set < len(z.serverPools[o.pool].sets) {
				o.debugln("Resuming", o)
				entries, err = z.serverPools[o.pool].sets[o.set].streamMetadataParts(ctx, *o)
				entries.reuse = true // We read from stream and are not sharing results.
				if err == nil {
					return entries, nil
				}
			} else {
				err = fmt.Errorf("invalid pool/set")
				o.pool, o.set = 0, 0
			}
		}

		if resp.Update != nil {
			select {
			case <-ctx.Done():
			case updates <- *resp.Update:
			}
		}
		if resp.Final != nil {
			final = resp.Final
		}
		// We can't reuse the response since it is sent upstream.
		return nil
	})
	if err != nil {
		return cache, toStorageErr(err)
	}
	if final == nil {
		return cache, errors.New("no final cache")
	}
	return *final, nil

func removeEmptyPort(host string) string {
	if hasPort(host) {
		return strings.TrimSuffix(host, ":")
	}
	return host
}

// Copied from http.NewRequest but implemented to ensure we reuse `url.URL` instance.
func (c *Client) newRequest(ctx context.Context, u url.URL, body io.Reader) (*http.Request, error) {
	rc, ok := body.(io.ReadCloser)
	if !ok && body != nil {
		rc = io.NopCloser(body)
	}

	buf := grid.GetByteBufferCap(32 + 16<<10)
	return &RenameDataInlineHandlerParams{RenameDataHandlerParams{FI: FileInfo{Data: buf[:0]}}}
}

// Recycle will reuse the memory allocated for the FileInfo data.
func (r *RenameDataInlineHandlerParams) Recycle() {
	if r == nil {
		return
	}
	if cap(r.FI.Data) >= xioutil.SmallBlock {
		grid.PutByteBuffer(r.FI.Data)

			s.writeErrorResponse(w, err)
			return
		}
		verifier = NewBitrotVerifier(BitrotAlgorithmFromString(r.Form.Get(storageRESTBitrotAlgo)), hash)
	}
	buf := make([]byte, length)
	defer metaDataPoolPut(buf) // Reuse if we can.
	_, err = s.getStorage().ReadFile(r.Context(), volume, filePath, int64(offset), buf, verifier)
	if err != nil {
		s.writeErrorResponse(w, err)
		return
	}

	if err != nil {
		return nil, err
	}
	cl.subroute = &c.subID
	return cl, nil
}

// Request allows to do a single remote request.
// 'req' will not be used after the call and caller can reuse.
// If no deadline is set on ctx, a 1-minute deadline will be added.
func (c *Connection) Request(ctx context.Context, h HandlerID, req []byte) ([]byte, error) {
	if !h.valid() {
		return nil, ErrUnknownHandler
	}

	return res
}

// metaCacheEntriesSorted contains metacache entries that are sorted.
type metaCacheEntriesSorted struct {
	o metaCacheEntries
	// list id is not serialized
	listID string
	// Reuse buffers
	reuse bool
	// Contain the last skipped object after an ILM expiry evaluation
	lastSkippedEntry string
}

// shallowClone will create a shallow clone of the array objects,