using System;
using System.Collections.Generic;

namespace Unosquare.Swan.Networking {
  /// <summary>
  /// Represents a response from a DNS server.
  /// </summary>
  public class DnsQueryResult {
    private readonly List<DnsRecord> m_AnswerRecords = new List<DnsRecord>();
    private readonly List<DnsRecord> m_AdditionalRecords = new List<DnsRecord>();
    private readonly List<DnsRecord> m_AuthorityRecords = new List<DnsRecord>();

    /// <summary>
    /// Initializes a new instance of the <see cref="DnsQueryResult"/> class.
    /// </summary>
    /// <param name="response">The response.</param>
    internal DnsQueryResult(DnsClient.DnsClientResponse response)
        : this() {
      this.Id = response.Id;
      this.IsAuthoritativeServer = response.IsAuthorativeServer;
      this.IsRecursionAvailable = response.IsRecursionAvailable;
      this.IsTruncated = response.IsTruncated;
      this.OperationCode = response.OperationCode;
      this.ResponseCode = response.ResponseCode;

      if(response.AnswerRecords != null) {
        foreach(DnsClient.IDnsResourceRecord record in response.AnswerRecords) {
          this.AnswerRecords.Add(new DnsRecord(record));
        }
      }

      if(response.AuthorityRecords != null) {
        foreach(DnsClient.IDnsResourceRecord record in response.AuthorityRecords) {
          this.AuthorityRecords.Add(new DnsRecord(record));
        }
      }

      if(response.AdditionalRecords != null) {
        foreach(DnsClient.IDnsResourceRecord record in response.AdditionalRecords) {
          this.AdditionalRecords.Add(new DnsRecord(record));
        }
      }
    }

    private DnsQueryResult() {
    }

    /// <summary>
    /// Gets the identifier.
    /// </summary>
    /// <value>
    /// The identifier.
    /// </value>
    public Int32 Id {
      get;
    }

    /// <summary>
    /// Gets a value indicating whether this instance is authoritative server.
    /// </summary>
    /// <value>
    /// <c>true</c> if this instance is authoritative server; otherwise, <c>false</c>.
    /// </value>
    public Boolean IsAuthoritativeServer {
      get;
    }

    /// <summary>
    /// Gets a value indicating whether this instance is truncated.
    /// </summary>
    /// <value>
    /// <c>true</c> if this instance is truncated; otherwise, <c>false</c>.
    /// </value>
    public Boolean IsTruncated {
      get;
    }

    /// <summary>
    /// Gets a value indicating whether this instance is recursion available.
    /// </summary>
    /// <value>
    /// <c>true</c> if this instance is recursion available; otherwise, <c>false</c>.
    /// </value>
    public Boolean IsRecursionAvailable {
      get;
    }

    /// <summary>
    /// Gets the operation code.
    /// </summary>
    /// <value>
    /// The operation code.
    /// </value>
    public DnsOperationCode OperationCode {
      get;
    }

    /// <summary>
    /// Gets the response code.
    /// </summary>
    /// <value>
    /// The response code.
    /// </value>
    public DnsResponseCode ResponseCode {
      get;
    }

    /// <summary>
    /// Gets the answer records.
    /// </summary>
    /// <value>
    /// The answer records.
    /// </value>
    public IList<DnsRecord> AnswerRecords => this.m_AnswerRecords;

    /// <summary>
    /// Gets the additional records.
    /// </summary>
    /// <value>
    /// The additional records.
    /// </value>
    public IList<DnsRecord> AdditionalRecords => this.m_AdditionalRecords;

    /// <summary>
    /// Gets the authority records.
    /// </summary>
    /// <value>
    /// The authority records.
    /// </value>
    public IList<DnsRecord> AuthorityRecords => this.m_AuthorityRecords;
  }
}