package json

import (
	"encoding/json"
	"io"

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

// ----------------------------------------------------------------------------
// Codec
// ----------------------------------------------------------------------------

// NewClientCodec returns a new JSON Codec.
func NewClientCodec() protocol.ClientCodec {
	return &ClientCodec{}
}

// ClientCodec creates a ClientCodecRequest to process each request.
type ClientCodec struct {
}

func (cc *ClientCodec) NewDecoder(r io.Reader) interface{} {
	return json.NewDecoder(r)
}

func (cc *ClientCodec) WriteRequest(w io.Writer, method string, args []interface{}, id interface{}) error {
	params, err := convertParamsToStringArray(args)
	if nil != err {
		return err
	}

	req := &clientRequest{
		Version: Version,
		Method:  method,
		Params:  params,
		ID:      id,
	}

	encoder := json.NewEncoder(w)
	if err := encoder.Encode(req); nil != err {
		return err
	}

	return nil
}

// NewMessage returns a ClientMessageCodec.
func (cc *ClientCodec) NewResponse(decoder interface{}) (protocol.ClientResponseCodec, error) {
	return newClientResponseCodec(decoder.(*json.Decoder))
}