package nfs

import (
	"bytes"
	"context"

	"github.com/willscott/go-nfs-client/nfs/xdr"
)

// PathNameMax is the maximum length for a file name
const PathNameMax = 255

func onPathConf(ctx context.Context, w *response, userHandle Handler) error {
	roothandle, err := xdr.ReadOpaque(w.req.Body)
	if err != nil {
		return &NFSStatusError{NFSStatusInval, err}
	}
	fs, path, err := userHandle.FromHandle(roothandle)
	if err != nil {
		return &NFSStatusError{NFSStatusStale, err}
	}

	writer := bytes.NewBuffer([]byte{})
	if err := xdr.Write(writer, uint32(NFSStatusOk)); err != nil {
		return &NFSStatusError{NFSStatusServerFault, err}
	}
	if err := WritePostOpAttrs(writer, tryStat(ctx, fs, path)); err != nil {
		return &NFSStatusError{NFSStatusServerFault, err}
	}

	type PathConf struct {
		LinkMax         uint32
		NameMax         uint32
		NoTrunc         uint32
		ChownRestricted uint32
		CaseInsensitive uint32
		CasePreserving  uint32
	}

	defaults := PathConf{
		LinkMax:         1,
		NameMax:         PathNameMax,
		NoTrunc:         1,
		ChownRestricted: 0,
		CaseInsensitive: 0,
		CasePreserving:  1,
	}
	if err := xdr.Write(writer, defaults); err != nil {
		return &NFSStatusError{NFSStatusServerFault, err}
	}
	if err := w.Write(writer.Bytes()); err != nil {
		return &NFSStatusError{NFSStatusServerFault, err}
	}
	return nil
}