/*
 *
 * Copyright 2019 gRPC authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package grpc

import (
	
	
	
)

// PreparedMsg is responsible for creating a Marshalled and Compressed object.
//
// # Experimental
//
// Notice: This type is EXPERIMENTAL and may be changed or removed in a
// later release.
type PreparedMsg struct {
	// Struct for preparing msg before sending them
	encodedData mem.BufferSlice
	hdr         []byte
	payload     mem.BufferSlice
	pf          payloadFormat
}

// Encode marshalls and compresses the message using the codec and compressor for the stream.
func ( *PreparedMsg) ( Stream,  any) error {
	 := .Context()
	,  := rpcInfoFromContext()
	if ! {
		return status.Errorf(codes.Internal, "grpc: unable to get rpcInfo")
	}

	// check if the context has the relevant information to prepareMsg
	if .preloaderInfo == nil {
		return status.Errorf(codes.Internal, "grpc: rpcInfo.preloaderInfo is nil")
	}
	if .preloaderInfo.codec == nil {
		return status.Errorf(codes.Internal, "grpc: rpcInfo.preloaderInfo.codec is nil")
	}

	// prepare the msg
	,  := encode(.preloaderInfo.codec, )
	if  != nil {
		return 
	}

	 := .Materialize()
	.Free()
	.encodedData = mem.BufferSlice{mem.SliceBuffer()}

	// TODO: it should be possible to grab the bufferPool from the underlying
	//  stream implementation with a type cast to its actual type (such as
	//  addrConnStream) and accessing the buffer pool directly.
	var  mem.BufferSlice
	, .pf,  = compress(.encodedData, .preloaderInfo.cp, .preloaderInfo.comp, mem.DefaultBufferPool())
	if  != nil {
		return 
	}

	if .pf.isCompressed() {
		 := .Materialize()
		.Free()
		 = mem.BufferSlice{mem.SliceBuffer()}
	}

	.hdr, .payload = msgHeader(.encodedData, , .pf)

	return nil
}