using System;

namespace Unosquare.Swan {
  /// <summary>
  /// Event arguments representing the message that is logged
  /// on to the terminal. Use the properties to forward the data to
  /// your logger of choice.
  /// </summary>
  /// <seealso cref="System.EventArgs" />
  public class LogMessageReceivedEventArgs : EventArgs {
    /// <summary>
    /// Initializes a new instance of the <see cref="LogMessageReceivedEventArgs" /> class.
    /// </summary>
    /// <param name="sequence">The sequence.</param>
    /// <param name="messageType">Type of the message.</param>
    /// <param name="utcDate">The UTC date.</param>
    /// <param name="source">The source.</param>
    /// <param name="message">The message.</param>
    /// <param name="extendedData">The extended data.</param>
    /// <param name="callerMemberName">Name of the caller member.</param>
    /// <param name="callerFilePath">The caller file path.</param>
    /// <param name="callerLineNumber">The caller line number.</param>
    public LogMessageReceivedEventArgs(
        UInt64 sequence,
        LogMessageType messageType,
        DateTime utcDate,
        String source,
        String message,
        Object extendedData,
        String callerMemberName,
        String callerFilePath,
        Int32 callerLineNumber) {
      this.Sequence = sequence;
      this.MessageType = messageType;
      this.UtcDate = utcDate;
      this.Source = source;
      this.Message = message;
      this.CallerMemberName = callerMemberName;
      this.CallerFilePath = callerFilePath;
      this.CallerLineNumber = callerLineNumber;
      this.ExtendedData = extendedData;
    }

    /// <summary>
    /// Gets logging message sequence.
    /// </summary>
    /// <value>
    /// The sequence.
    /// </value>
    public UInt64 Sequence {
      get;
    }

    /// <summary>
    /// Gets the type of the message.
    /// It can be a combination as the enumeration is a set of bitwise flags.
    /// </summary>
    /// <value>
    /// The type of the message.
    /// </value>
    public LogMessageType MessageType {
      get;
    }

    /// <summary>
    /// Gets the UTC date at which the event at which the message was logged.
    /// </summary>
    /// <value>
    /// The UTC date.
    /// </value>
    public DateTime UtcDate {
      get;
    }

    /// <summary>
    /// Gets the name of the source where the logging message
    /// came from. This can come empty if the logger did not set it.
    /// </summary>
    /// <value>
    /// The source.
    /// </value>
    public String Source {
      get;
    }

    /// <summary>
    /// Gets the body of the message.
    /// </summary>
    /// <value>
    /// The message.
    /// </value>
    public String Message {
      get;
    }

    /// <summary>
    /// Gets the name of the caller member.
    /// </summary>
    /// <value>
    /// The name of the caller member.
    /// </value>
    public String CallerMemberName {
      get;
    }

    /// <summary>
    /// Gets the caller file path.
    /// </summary>
    /// <value>
    /// The caller file path.
    /// </value>
    public String CallerFilePath {
      get;
    }

    /// <summary>
    /// Gets the caller line number.
    /// </summary>
    /// <value>
    /// The caller line number.
    /// </value>
    public Int32 CallerLineNumber {
      get;
    }

    /// <summary>
    /// Gets an object representing extended data.
    /// It could be an exception or anything else.
    /// </summary>
    /// <value>
    /// The extended data.
    /// </value>
    public Object ExtendedData {
      get;
    }

    /// <summary>
    /// Gets the Extended Data properties cast as an Exception (if possible)
    /// Otherwise, it return null.
    /// </summary>
    /// <value>
    /// The exception.
    /// </value>
    public Exception Exception => this.ExtendedData as Exception;
  }

  /// <summary>
  /// Event arguments representing a message logged and about to be
  /// displayed on the terminal (console). Set the CancelOutput property in the
  /// event handler to prevent the terminal from displaying the message.
  /// </summary>
  /// <seealso cref="LogMessageReceivedEventArgs" />
  public class LogMessageDisplayingEventArgs : LogMessageReceivedEventArgs {
    /// <summary>
    /// Initializes a new instance of the <see cref="LogMessageDisplayingEventArgs"/> class.
    /// </summary>
    /// <param name="data">The <see cref="LogMessageReceivedEventArgs"/> instance containing the event data.</param>
    public LogMessageDisplayingEventArgs(LogMessageReceivedEventArgs data)
        : base(
            data.Sequence,
            data.MessageType,
            data.UtcDate,
            data.Source,
            data.Message,
            data.ExtendedData,
            data.CallerMemberName,
            data.CallerFilePath,
            data.CallerLineNumber) => this.CancelOutput = false;

    /// <summary>
    /// Gets or sets a value indicating whether the displaying of the
    /// logging message should be canceled.
    /// </summary>
    /// <value>
    ///   <c>true</c> if [cancel output]; otherwise, <c>false</c>.
    /// </value>
    public Boolean CancelOutput {
      get; set;
    }
  }
}