var HistoryBuffer;

HistoryBuffer = (function() {
  function HistoryBuffer(user_id) {
    this.user_id = user_id;
    this.operation_counter = {};
    this.buffer = {};
    this.change_listeners = [];
  }

  HistoryBuffer.prototype.getUserId = function() {
    return this.user_id;
  };

  HistoryBuffer.prototype.getReservedUniqueIdentifier = function() {
    return {
      creator: '_',
      op_number: '_'
    };
  };

  HistoryBuffer.prototype.getOperationCounter = function() {
    var ctn, res, user, _ref;
    res = {};
    _ref = this.operation_counter;
    for (user in _ref) {
      ctn = _ref[user];
      res[user] = ctn;
    }
    return res;
  };

  HistoryBuffer.prototype._encode = function(state_vector) {
    var json, o, o_json, o_next, o_number, o_prev, u_name, unknown, user, _ref;
    if (state_vector == null) {
      state_vector = {};
    }
    json = [];
    unknown = function(user, o_number) {
      if ((user == null) || (o_number == null)) {
        throw new Error("dah!");
      }
      return (state_vector[user] == null) || state_vector[user] <= o_number;
    };
    _ref = this.buffer;
    for (u_name in _ref) {
      user = _ref[u_name];
      for (o_number in user) {
        o = user[o_number];
        if (!isNaN(parseInt(o_number)) && unknown(u_name, o_number)) {
          o_json = o._encode();
          if (o.next_cl != null) {
            o_next = o.next_cl;
            while ((o_next.next_cl != null) && unknown(o_next.creator, o_next.op_number)) {
              o_next = o_next.next_cl;
            }
            o_json.next = o_next.getUid();
          } else if (o.prev_cl != null) {
            o_prev = o.prev_cl;
            while ((o_prev.prev_cl != null) && unknown(o_next.creator, o_next.op_number)) {
              o_prev = o_prev.prev_cl;
            }
            o_json.prev = o_prev.getUid();
          }
          json.push(o_json);
        }
      }
    }
    return json;
  };

  HistoryBuffer.prototype.getNextOperationIdentifier = function(user_id) {
    var uid;
    if (user_id == null) {
      user_id = this.user_id;
    }
    if (this.operation_counter[user_id] == null) {
      this.operation_counter[user_id] = 0;
    }
    uid = {
      'creator': user_id,
      'op_number': this.operation_counter[user_id]
    };
    this.operation_counter[user_id]++;
    return uid;
  };

  HistoryBuffer.prototype.getOperation = function(uid) {
    var _ref;
    if (uid instanceof Object) {
      return (_ref = this.buffer[uid.creator]) != null ? _ref[uid.op_number] : void 0;
    } else if (uid == null) {

    } else {
      throw new Error("This type of uid is not defined!");
    }
  };

  HistoryBuffer.prototype.addOperation = function(o) {
    if (this.buffer[o.creator] == null) {
      this.buffer[o.creator] = {};
    }
    if (this.buffer[o.creator][o.op_number] != null) {
      throw new Error("You must not overwrite operations!");
    }
    this.buffer[o.creator][o.op_number] = o;
    return o;
  };

  HistoryBuffer.prototype.addToCounter = function(o) {
    if (this.operation_counter[o.creator] == null) {
      this.operation_counter[o.creator] = 0;
    }
    if (typeof o.op_number === 'number' && o.creator !== this.getUserId()) {
      return this.operation_counter[o.creator]++;
    }
  };

  return HistoryBuffer;

})();

module.exports = HistoryBuffer;

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