"use strict";
// Wire protocol representation of events and actions

var Trie = require('./trie.js');
var Patch = require('./patch.js');
var Struct = require('./struct.js');

function _encode(e) {
  switch (e.type) {
    case "stateChange":
      return ["patch", e.patch.toJSON()];
    case "message":
      return ["message", e.message];
  }
}

function _decode(what) {
  return function (j) {
    switch (j[0]) {
      case "patch":
        return Syndicate.stateChange(Patch.fromJSON(j[1]));
      case "message":
        return Syndicate.message(j[1]);
      default:
        throw new Error("Invalid JSON-encoded " + what + ": " + JSON.stringify(j));
    }
  };
}

///////////////////////////////////////////////////////////////////////////

module.exports.encodeEvent = _encode;
module.exports.decodeEvent = _decode("event");
module.exports.encodeAction = _encode;
module.exports.decodeAction = _decode("action");