package json

import (
	"encoding/json"
	"fmt"
	"sync"

	"git.loafle.net/commons_go/rpc/protocol"
)

// ----------------------------------------------------------------------------
// ClientCodecResponse
// ----------------------------------------------------------------------------

// newClientCodecResponse returns a new ClientCodecResponse.
func newClientCodecResponse(raw json.RawMessage) (protocol.ClientCodecResponse, error) {
	// Decode the request body and check if RPC method is valid.
	ccr := retainClientCodecResponse()
	err := json.Unmarshal(raw, &ccr.response)
	if err != nil {
		releaseClientCodecResponse(ccr)
		return nil, err
	}
	if nil == ccr.response.ID {
		releaseClientCodecResponse(ccr)
		return nil, fmt.Errorf("This is not Response")
	}

	if ccr.response.Version != Version {
		ccr.err = &Error{
			Code:    E_INVALID_REQ,
			Message: "jsonrpc must be " + Version,
			Data:    ccr.response,
		}
	}

	return ccr, nil
}

// ClientCodecResponse decodes and encodes a single request.
type ClientCodecResponse struct {
	response clientResponse
	err      error
}

func (ccr *ClientCodecResponse) ID() interface{} {
	return ccr.response.ID
}

func (ccr *ClientCodecResponse) Result() interface{} {
	return ccr.response.Result
}

func (ccr *ClientCodecResponse) Error() error {
	return ccr.response.Error.(error)
}

func (ccr *ClientCodecResponse) Complete() {
	releaseClientCodecResponse(ccr)
}

var clientCodecResponsePool sync.Pool

func retainClientCodecResponse() *ClientCodecResponse {
	v := clientCodecResponsePool.Get()
	if v == nil {
		return &ClientCodecResponse{}
	}
	return v.(*ClientCodecResponse)
}

func releaseClientCodecResponse(ccr *ClientCodecResponse) {
	ccr.response.Version = ""
	ccr.response.Result = nil
	ccr.response.Error = nil
	ccr.response.ID = nil

	clientCodecResponsePool.Put(ccr)
}