package slobs

import "encoding/json"

type RPCRequest struct {
	Method  string      `json:"method"`
	Params  interface{} `json:"params,omitempty"`
	ID      int         `json:"id"`
	JSONRPC string      `json:"jsonrpc"`
}

// RPCResponse represents a JSON-RPC response object.
//
// Result: holds the result of the rpc call if no error occurred, nil otherwise. can be nil even on success.
//
// Error: holds an RPCError object if an error occurred. must be nil on success.
//
// ID: may always be 0 for single requests. is unique for each request in a batch call (see CallBatch())
//
// JSONRPC: must always be set to "2.0" for JSON-RPC version 2.0
//
// See: http://www.jsonrpc.org/specification#response_object
type RPCResponse struct {
	JSONRPC string           `json:"jsonrpc"`
	Result  *json.RawMessage `json:"result,omitempty"`
	Error   *RPCError        `json:"error,omitempty"`
	ID      *int             `json:"id"`
}

func (r *RPCResponse) DecodeTo(v interface{}) error {
	return json.Unmarshal(*r.Result, &v)
}

// RPCError represents a JSON-RPC error object if an RPC error occurred.
//
// Code: holds the error code
//
// Message: holds a short error message
//
// Data: holds additional error data, may be nil
//
// See: http://www.jsonrpc.org/specification#error_object
type RPCError struct {
	Code    int         `json:"code"`
	Message string      `json:"message"`
	Data    interface{} `json:"data,omitempty"`
}