/*!
 * netaddress.js - network address object for bcoin
 * Copyright (c) 2014-2017, Christopher Jeffrey (MIT License).
 * https://github.com/bcoin-org/bcoin
 */

'use strict';

const assert = require('bsert');
const bio = require('bufio');
const IP = require('binet');
const Network = require('../protocol/network');
const util = require('../utils/util');
const common = require('./common');
const {inspectSymbol} = require('../utils');

/**
 * Net Address
 * Represents a network address.
 * @alias module:net.NetAddress
 * @property {Host} host
 * @property {Number} port
 * @property {Number} services
 * @property {Number} time
 */

class NetAddress {
  /**
   * Create a network address.
   * @constructor
   * @param {Object} options
   * @param {Number?} options.time - Timestamp.
   * @param {Number?} options.services - Service bits.
   * @param {String?} options.host - IP address (IPv6 or IPv4).
   * @param {Number?} options.port - Port.
   */

  constructor(options) {
    this.host = '0.0.0.0';
    this.port = 0;
    this.services = 0;
    this.time = 0;
    this.hostname = '0.0.0.0:0';
    this.raw = IP.ZERO_IP;

    if (options)
      this.fromOptions(options);
  }

  /**
   * Inject properties from options object.
   * @private
   * @param {Object} options
   */

  fromOptions(options) {
    assert(typeof options.host === 'string');
    assert(typeof options.port === 'number');

    this.raw = IP.toBuffer(options.host);
    this.host = IP.toString(this.raw);
    this.port = options.port;

    if (options.services) {
      assert(typeof options.services === 'number');
      this.services = options.services;
    }

    if (options.time) {
      assert(typeof options.time === 'number');
      this.time = options.time;
    }

    this.hostname = IP.toHostname(this.host, this.port);

    return this;
  }

  /**
   * Instantiate network address from options.
   * @param {Object} options
   * @returns {NetAddress}
   */

  static fromOptions(options) {
    return new this().fromOptions(options);
  }

  /**
   * Test whether required services are available.
   * @param {Number} services
   * @returns {Boolean}
   */

  hasServices(services) {
    return (this.services & services) === services;
  }

  /**
   * Test whether the address is IPv4.
   * @returns {Boolean}
   */

  isIPv4() {
    return IP.isIPv4(this.raw);
  }

  /**
   * Test whether the address is IPv6.
   * @returns {Boolean}
   */

  isIPv6() {
    return IP.isIPv6(this.raw);
  }

  /**
   * Test whether the host is null.
   * @returns {Boolean}
   */

  isNull() {
    return IP.isNull(this.raw);
  }

  /**
   * Test whether the host is a local address.
   * @returns {Boolean}
   */

  isLocal() {
    return IP.isLocal(this.raw);
  }

  /**
   * Test whether the host is valid.
   * @returns {Boolean}
   */

  isValid() {
    return IP.isValid(this.raw);
  }

  /**
   * Test whether the host is routable.
   * @returns {Boolean}
   */

  isRoutable() {
    return IP.isRoutable(this.raw);
  }

  /**
   * Test whether the host is an onion address.
   * @returns {Boolean}
   */

  isOnion() {
    return IP.isOnion(this.raw);
  }

  /**
   * Compare against another network address.
   * @returns {Boolean}
   */

  equal(addr) {
    return this.compare(addr) === 0;
  }

  /**
   * Compare against another network address.
   * @returns {Number}
   */

  compare(addr) {
    const cmp = this.raw.compare(addr.raw);

    if (cmp !== 0)
      return cmp;

    return this.port - addr.port;
  }

  /**
   * Get reachable score to destination.
   * @param {NetAddress} dest
   * @returns {Number}
   */

  getReachability(dest) {
    return IP.getReachability(this.raw, dest.raw);
  }

  /**
   * Set null host.
   */

  setNull() {
    this.raw = IP.ZERO_IP;
    this.host = '0.0.0.0';
    this.hostname = IP.toHostname(this.host, this.port);
  }

  /**
   * Set host.
   * @param {String} host
   */

  setHost(host) {
    this.raw = IP.toBuffer(host);
    this.host = IP.toString(this.raw);
    this.hostname = IP.toHostname(this.host, this.port);
  }

  /**
   * Set port.
   * @param {Number} port
   */

  setPort(port) {
    assert(port >= 0 && port <= 0xffff);
    this.port = port;
    this.hostname = IP.toHostname(this.host, port);
  }

  /**
   * Inject properties from host, port, and network.
   * @private
   * @param {String} host
   * @param {Number} port
   * @param {(Network|NetworkType)?} network
   */

  fromHost(host, port, network) {
    network = Network.get(network);

    assert(port >= 0 && port <= 0xffff);

    this.raw = IP.toBuffer(host);
    this.host = IP.toString(this.raw);
    this.port = port;
    this.services = NetAddress.DEFAULT_SERVICES;
    this.time = network.now();

    this.hostname = IP.toHostname(this.host, this.port);

    return this;
  }

  /**
   * Instantiate a network address
   * from a host and port.
   * @param {String} host
   * @param {Number} port
   * @param {(Network|NetworkType)?} network
   * @returns {NetAddress}
   */

  static fromHost(host, port, network) {
    return new this().fromHost(host, port, network);
  }

  /**
   * Inject properties from hostname and network.
   * @private
   * @param {String} hostname
   * @param {(Network|NetworkType)?} network
   */

  fromHostname(hostname, network) {
    network = Network.get(network);

    const addr = IP.fromHostname(hostname, network.port);

    return this.fromHost(addr.host, addr.port, network);
  }

  /**
   * Instantiate a network address
   * from a hostname (i.e. 127.0.0.1:8333).
   * @param {String} hostname
   * @param {(Network|NetworkType)?} network
   * @returns {NetAddress}
   */

  static fromHostname(hostname, network) {
    return new this().fromHostname(hostname, network);
  }

  /**
   * Inject properties from socket.
   * @private
   * @param {net.Socket} socket
   */

  fromSocket(socket, network) {
    const host = socket.remoteAddress;
    const port = socket.remotePort;
    assert(typeof host === 'string');
    assert(typeof port === 'number');
    return this.fromHost(IP.normalize(host), port, network);
  }

  /**
   * Instantiate a network address
   * from a socket.
   * @param {net.Socket} socket
   * @returns {NetAddress}
   */

  static fromSocket(hostname, network) {
    return new this().fromSocket(hostname, network);
  }

  /**
   * Inject properties from buffer reader.
   * @private
   * @param {BufferReader} br
   * @param {Boolean?} full - Include timestamp.
   */

  fromReader(br, full) {
    this.time = full ? br.readU32() : 0;
    this.services = br.readU32();

    // Note: hi service bits
    // are currently unused.
    br.readU32();

    this.raw = br.readBytes(16);
    this.host = IP.toString(this.raw);
    this.port = br.readU16BE();
    this.hostname = IP.toHostname(this.host, this.port);

    return this;
  }

  /**
   * Inject properties from serialized data.
   * @private
   * @param {Buffer} data
   * @param {Boolean?} full - Include timestamp.
   */

  fromRaw(data, full) {
    return this.fromReader(bio.read(data), full);
  }

  /**
   * Insantiate a network address from buffer reader.
   * @param {BufferReader} br
   * @param {Boolean?} full - Include timestamp.
   * @returns {NetAddress}
   */

  static fromReader(br, full) {
    return new this().fromReader(br, full);
  }

  /**
   * Insantiate a network address from serialized data.
   * @param {Buffer} data
   * @param {Boolean?} full - Include timestamp.
   * @returns {NetAddress}
   */

  static fromRaw(data, full) {
    return new this().fromRaw(data, full);
  }

  /**
   * Write network address to a buffer writer.
   * @param {BufferWriter} bw
   * @param {Boolean?} full - Include timestamp.
   * @returns {Buffer}
   */

  toWriter(bw, full) {
    if (full)
      bw.writeU32(this.time);

    bw.writeU32(this.services);
    bw.writeU32(0);
    bw.writeBytes(this.raw);
    bw.writeU16BE(this.port);

    return bw;
  }

  /**
   * Calculate serialization size of address.
   * @returns {Number}
   */

  getSize(full) {
    return 26 + (full ? 4 : 0);
  }

  /**
   * Serialize network address.
   * @param {Boolean?} full - Include timestamp.
   * @returns {Buffer}
   */

  toRaw(full) {
    const size = this.getSize(full);
    return this.toWriter(bio.write(size), full).render();
  }

  /**
   * Convert net address to json-friendly object.
   * @returns {Object}
   */

  toJSON() {
    return {
      host: this.host,
      port: this.port,
      services: this.services,
      time: this.time
    };
  }

  /**
   * Inject properties from json object.
   * @private
   * @param {Object} json
   * @returns {NetAddress}
   */

  fromJSON(json) {
    assert((json.port & 0xffff) === json.port);
    assert((json.services >>> 0) === json.services);
    assert((json.time >>> 0) === json.time);
    this.raw = IP.toBuffer(json.host);
    this.host = json.host;
    this.port = json.port;
    this.services = json.services;
    this.time = json.time;
    this.hostname = IP.toHostname(this.host, this.port);
    return this;
  }

  /**
   * Instantiate net address from json object.
   * @param {Object} json
   * @returns {NetAddress}
   */

  static fromJSON(json) {
    return new this().fromJSON(json);
  }

  /**
   * Inspect the network address.
   * @returns {Object}
   */

  [inspectSymbol]() {
    return '<NetAddress:'
      + ` hostname=${this.hostname}`
      + ` services=${this.services.toString(2)}`
      + ` date=${util.date(this.time)}`
      + '>';
  }
}

/**
 * Default services for
 * unknown outbound peers.
 * @const {Number}
 * @default
 */

NetAddress.DEFAULT_SERVICES = 0
  | common.services.NETWORK
  | common.services.WITNESS
  | common.services.BLOOM;

/*
 * Expose
 */

module.exports = NetAddress;