export type PointerTarget = string | number | undefined;

export type Pointer = {
  localContext: string;
  target: PointerTarget;
  targetContext?: string;
};

export type Delta = {
  creator: string;
  host: string;
  pointers: Pointer[];
  receivedFrom?: PeerAddress;
}

export type DeltaContext = Delta & {
  creatorAddress: string;
};

export type Query = {
  filterExpr: JSON
};

export type QueryResult = {
  deltas: Delta[]
};

export enum Decision {
  Accept,
  Reject,
  Defer
};

export type JSONLogic = object;

export type FilterExpr = JSONLogic;

export type FilterGenerator = () => FilterExpr;

export type DeltaFilter = (delta: Delta) => boolean;

export type PropertyTypes = string | number | undefined;

export type Properties = {[key: string]: PropertyTypes};

export class PeerAddress {
  addr: string;
  port: number;

  constructor(addr: string, port: number) {
    this.addr = addr;
    this.port = port;
  }

  static fromString(addrString: string): PeerAddress {
    const [addr, port] = addrString.trim().split(':');
    return new PeerAddress(addr, parseInt(port));
  }

  toAddrString() {
    return `${this.addr}:${this.port}`;
  }

  toJSON() {
    return this.toAddrString();
  }

  isEqual(other: PeerAddress) {
    return this.addr === other.addr && this.port === other.port;
  }
};