using System;
using System.Text.RegularExpressions;

namespace TBF.BenchControl.Network.Telnet
{
	/// <summary>
	/// One part of the telnet client command, which consists of a pair CmdAction action and  string str.
	/// </summary>
	public enum CmdAction
	{
		VOID = 0,           /// Blank (uninitialized) action. 'str' is not used.
		CONNECT,            /// Connect (=open a TCP socket and log in). 'str'=hostname. Notify by 'Connected' event.
		SET_PROMPT,         /// Set a prompt string used in comparisons when executing ..._WAIT4PROMPT. 'str'=prompt.
		CLEAR_RESPONSE,     /// Clear received response buffer. 'str' is not used. Note: Response buffer is cleared also after a detected prompt.
		SEND_STRING,        /// Send a string and do nothing else. 'str'=string to be sent.
		SEND_MSRMNT_CMD,	/// Send a string and extract measurements from received data (filter received data)
		SEND_COMMAND,       /// Send a string and WAIT for a PROMPT. 'str'=string to be sent. Notify by 'PromptReceived' event.
		REBOOT_RECONNECT,   /// Send 'reboot' command (if connected), wait a while and reconect. 'str' is not used. Notify by 'Connected' event.
		EXIT_RECONNECT,     /// Send 'exit' (terminate telnet session) and reconect. 'str' is not used. Notify using 'Connected' event.
		DISCONNECT,         /// Send 'exit' to disconnect, do not reconnect. 'str' is not used.
		TERMINATE,          /// Terminate worker thread (should be done once before TelnetClient destruction. 'str' is not used.
		LABEL,				/// Label marking the start of item commands, 'str' identifies the item.
		NOTIFICATION,       /// Notify by 'Notification' event when this command is processed. 'str'=notification ID-string
	}


	/// <summary>
	/// Telnet client command. Consists of a pair 'action', 'str'
	///    CmdAction 'action' specifies the action to be taken.
	///    string 'str' is (in most cases) the string to be sent, however it might be a hostname or a prompt.
	/// </summary>
	public struct Command
	{
		/// Private fields
		CmdAction action;       /// Telnet client action to be taken, e.g. 'send a command'
		string str;             /// String argument, e.g. a Linux command to be sent.
		int duration;           /// Expected duration of the command in [s], 0 = immediate, -1 = unknown
		int timeout;            /// Timeout period for the command in [s], 0 = no timeout
		Regex fatalRegex;		/// A compiled regular expression for a fatal error, or null (null=no fatal error detection)
		Regex errorRegex;		/// A compiled regular expression for an error, or null (null=no error detection)
		Regex warningRegex;		/// A compiled regular expression for a warning, or null (null=no warning detection)
		Regex successRegex;		/// A compiled regular expression for a success, or null (null=no success detection)

		/// Public read only properties
		public CmdAction Action { get { return action; } }
		public string Str { get { return str; } }
		public int Duration { get { return duration; } }
		public int Timeout { get { return timeout; } }
		public Regex FatalRegex { get { return fatalRegex; } }
		public Regex ErrorRegex { get { return errorRegex; } }
		public Regex WarningRegex { get { return warningRegex; } }
		public Regex SuccessRegex { get { return successRegex; } }

		///
		/// Various constructors:
		///  - duration and timeout are in seconds
		///  - if timeout and duration is not supplied, timeout=0, duration=0 (timeout switched off)
		///  - if string is not supplied, null is used
		///
		public Command(CmdAction action, string str, int duration, int timeout,
					   Regex fatalRegex, Regex errorRegex, Regex warningRegex, Regex successRegex)
		{
			this.action = action;
			this.str = str;
			this.duration = duration;
			this.timeout = timeout;
			this.fatalRegex = fatalRegex;
			this.errorRegex = errorRegex;
			this.warningRegex = warningRegex;
			this.successRegex = successRegex;
		}

		public Command(CmdAction action, string str, int duration, int timeout)
			: this(action, str, duration, timeout, null, null, null, null)
		{
		}

		public Command(CmdAction action, string str)
			: this(action, str, 0, 0, null, null, null, null)
		{
		}

		public Command(CmdAction action, int duration, int timeout)
			: this(action, null, duration, timeout, null, null, null, null)
		{
		}

		public Command(CmdAction action)
			: this(action, null, 0, 0, null, null, null, null)
		{
		}

		/// <summary>
		/// For debugging purposes.
		/// </summary>
		/// <returns>A name of Command.action</returns>
		public override string ToString()
		{
			string result = action.ToString();

			if (str != null)
			{
				result += ", \"" + str + "\"";
			}

			if (action == CmdAction.CONNECT ||
				action == CmdAction.REBOOT_RECONNECT ||
				action == CmdAction.EXIT_RECONNECT ||
				action == CmdAction.SEND_COMMAND)
			{
				result += ", timeout=" + timeout.ToString() + "s";
			}

			if (action == CmdAction.SEND_COMMAND)
			{
				if (fatalRegex != null) { result += ", fatal=" + fatalRegex.ToString(); }
				if (errorRegex != null) { result += ", error=" + errorRegex.ToString(); }
				if (warningRegex != null) { result += ", warning=" + warningRegex.ToString(); }
				if (successRegex != null) { result += ", success=" + successRegex.ToString(); }
			}

			return result;
		}
	}
}