package json

import (
	"encoding/json"
	"io"

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

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

// NewCustomClientCodec returns a new JSON Codec based on passed encoder selector.
func NewCustomClientCodec(codecSel codec.CodecSelector) protocol.ClientCodec {
	return &ClientCodec{codecSel: codecSel}
}

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

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

func (cc *ClientCodec) WriteRequest(w io.Writer, method string, args interface{}, id interface{}) error {
	req := &clientRequest{
		Version: Version,
		Method:  method,
		Params:  args,
		ID:      id,
	}

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

	return nil
}

// NewMessage returns a ClientMessageCodec.
func (cc *ClientCodec) NewResponse(r io.Reader) (protocol.ClientResponseCodec, error) {
	return newClientResponseCodec(r, cc.codecSel.SelectByReader(r))
}