export type S7DataType = 'bool' | 'byte' | 'int' | 'word' | 'dint' | 'dword' | 'lint' | 'ulint' | 'real' | 'string' | 'wstring';

export interface ReadPoint {
  address: string;
  dataType: S7DataType;
  stringLen?: number;
}

export interface WritePoint extends ReadPoint {
  value: any;
}

export interface PollPoint {
  address: string;
  dataType: S7DataType;
  stringLen?: number;
  name?: string;
}

export interface ChangeRecord {
  address: string;
  dataType: S7DataType;
  oldValue: any;
  newValue: any;
  name?: string;
}

export interface EnhancedClientOptions {
  ip: string;
  port: number;
  rack: number;
  slot: number;
  interval?: number;
  reconnectInterval?: number;
}

export interface ParsedAddr {
  dbNumber: number;
  addrType: 'DBX' | 'DBB' | 'DBW' | 'DBD';
  byteOffset: number;
  bitOffset: number;
}

export interface GroupedItem<T> {
  addr: ParsedAddr;
  item: T;
}

export type ChangeHandler = (changes: ChangeRecord[]) => void;
export type ErrorHandler = (error: any) => void;
export type ConnectHandler = () => void;