'use strict';
/* 
   command management - allow for non-ops to execute approved javascript code.
*/
var _commands = {};
var _cmdInterceptors = [];
/*
  execute a JSP command.
*/
var executeCmd = function(args, player){
  if (args.length === 0)
    throw new Error('Usage: jsp command-name command-parameters');
  var name = args[0];
  var cmd = _commands[name];
  if (typeof cmd === 'undefined'){
    // it's not a global command - pass it on to interceptors
    var intercepted = false;
    for (var i = 0;i < _cmdInterceptors.length;i++){
      if (_cmdInterceptors[i](args,player))
        intercepted = true;
    }
    if (!intercepted)
      console.warn('Command %s is not recognised',name);
  }else{
    var result = null;
    try { 
      result = cmd.callback(args.slice(1),player);
    }catch (e){
      console.error('Error while trying to execute command: ' + JSON.stringify(args));
      throw e;
    }
    return result;
  }
};
/*
  define a new JSP command.
*/
var defineCmd = function(name, func, options, intercepts) {
  if (typeof options == 'undefined')
    options = [];
  _commands[name] = {callback: func, options: options};
  if (intercepts)
    _cmdInterceptors.push(func);
  return func;
};
exports.command = defineCmd;
exports.commands = _commands;
exports.exec = executeCmd;