using System;
using System.Net;
using System.Text;

namespace Unosquare.Swan.Networking {
  /// <summary>
  /// Represents a DNS record entry.
  /// </summary>
  public class DnsRecord {
    /// <summary>
    /// Initializes a new instance of the <see cref="DnsRecord"/> class.
    /// </summary>
    /// <param name="record">The record.</param>
    internal DnsRecord(DnsClient.IDnsResourceRecord record)
        : this() {
      this.Name = record.Name.ToString();
      this.Type = record.Type;
      this.Class = record.Class;
      this.TimeToLive = record.TimeToLive;
      this.Data = record.Data;

      // PTR
      this.PointerDomainName = (record as DnsClient.DnsPointerResourceRecord)?.PointerDomainName?.ToString();

      // A
      this.IPAddress = (record as DnsClient.DnsIPAddressResourceRecord)?.IPAddress;

      // NS
      this.NameServerDomainName = (record as DnsClient.DnsNameServerResourceRecord)?.NSDomainName?.ToString();

      // CNAME
      this.CanonicalDomainName = (record as DnsClient.DnsCanonicalNameResourceRecord)?.CanonicalDomainName.ToString();

      // MX
      this.MailExchangerDomainName = (record as DnsClient.DnsMailExchangeResourceRecord)?.ExchangeDomainName.ToString();
      this.MailExchangerPreference = (record as DnsClient.DnsMailExchangeResourceRecord)?.Preference;

      // SOA
      this.SoaMasterDomainName = (record as DnsClient.DnsStartOfAuthorityResourceRecord)?.MasterDomainName.ToString();
      this.SoaResponsibleDomainName = (record as DnsClient.DnsStartOfAuthorityResourceRecord)?.ResponsibleDomainName.ToString();
      this.SoaSerialNumber = (record as DnsClient.DnsStartOfAuthorityResourceRecord)?.SerialNumber;
      this.SoaRefreshInterval = (record as DnsClient.DnsStartOfAuthorityResourceRecord)?.RefreshInterval;
      this.SoaRetryInterval = (record as DnsClient.DnsStartOfAuthorityResourceRecord)?.RetryInterval;
      this.SoaExpireInterval = (record as DnsClient.DnsStartOfAuthorityResourceRecord)?.ExpireInterval;
      this.SoaMinimumTimeToLive = (record as DnsClient.DnsStartOfAuthorityResourceRecord)?.MinimumTimeToLive;
    }

    private DnsRecord() {
      // placeholder
    }

    /// <summary>
    /// Gets the name.
    /// </summary>
    /// <value>
    /// The name.
    /// </value>
    public String Name {
      get;
    }

    /// <summary>
    /// Gets the type.
    /// </summary>
    /// <value>
    /// The type.
    /// </value>
    public DnsRecordType Type {
      get;
    }

    /// <summary>
    /// Gets the class.
    /// </summary>
    /// <value>
    /// The class.
    /// </value>
    public DnsRecordClass Class {
      get;
    }

    /// <summary>
    /// Gets the time to live.
    /// </summary>
    /// <value>
    /// The time to live.
    /// </value>
    public TimeSpan TimeToLive {
      get;
    }

    /// <summary>
    /// Gets the raw data of the record.
    /// </summary>
    /// <value>
    /// The data.
    /// </value>
    public Byte[] Data {
      get;
    }

    /// <summary>
    /// Gets the data text bytes in ASCII encoding.
    /// </summary>
    /// <value>
    /// The data text.
    /// </value>
    public String DataText => this.Data == null ? String.Empty : Encoding.ASCII.GetString(this.Data);

    /// <summary>
    /// Gets the name of the pointer domain.
    /// </summary>
    /// <value>
    /// The name of the pointer domain.
    /// </value>
    public String PointerDomainName {
      get;
    }

    /// <summary>
    /// Gets the ip address.
    /// </summary>
    /// <value>
    /// The ip address.
    /// </value>
    public IPAddress IPAddress {
      get;
    }

    /// <summary>
    /// Gets the name of the name server domain.
    /// </summary>
    /// <value>
    /// The name of the name server domain.
    /// </value>
    public String NameServerDomainName {
      get;
    }

    /// <summary>
    /// Gets the name of the canonical domain.
    /// </summary>
    /// <value>
    /// The name of the canonical domain.
    /// </value>
    public String CanonicalDomainName {
      get;
    }

    /// <summary>
    /// Gets the mail exchanger preference.
    /// </summary>
    /// <value>
    /// The mail exchanger preference.
    /// </value>
    public Int32? MailExchangerPreference {
      get;
    }

    /// <summary>
    /// Gets the name of the mail exchanger domain.
    /// </summary>
    /// <value>
    /// The name of the mail exchanger domain.
    /// </value>
    public String MailExchangerDomainName {
      get;
    }

    /// <summary>
    /// Gets the name of the soa master domain.
    /// </summary>
    /// <value>
    /// The name of the soa master domain.
    /// </value>
    public String SoaMasterDomainName {
      get;
    }

    /// <summary>
    /// Gets the name of the soa responsible domain.
    /// </summary>
    /// <value>
    /// The name of the soa responsible domain.
    /// </value>
    public String SoaResponsibleDomainName {
      get;
    }

    /// <summary>
    /// Gets the soa serial number.
    /// </summary>
    /// <value>
    /// The soa serial number.
    /// </value>
    public Int64? SoaSerialNumber {
      get;
    }

    /// <summary>
    /// Gets the soa refresh interval.
    /// </summary>
    /// <value>
    /// The soa refresh interval.
    /// </value>
    public TimeSpan? SoaRefreshInterval {
      get;
    }

    /// <summary>
    /// Gets the soa retry interval.
    /// </summary>
    /// <value>
    /// The soa retry interval.
    /// </value>
    public TimeSpan? SoaRetryInterval {
      get;
    }

    /// <summary>
    /// Gets the soa expire interval.
    /// </summary>
    /// <value>
    /// The soa expire interval.
    /// </value>
    public TimeSpan? SoaExpireInterval {
      get;
    }

    /// <summary>
    /// Gets the soa minimum time to live.
    /// </summary>
    /// <value>
    /// The soa minimum time to live.
    /// </value>
    public TimeSpan? SoaMinimumTimeToLive {
      get;
    }
  }
}