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using System;

using System.Threading;

using System.Collections.Generic;

using System.Text;

class Program {

	const byte DEBUG_LEVEL = 3;	//0, 1, 2, 3

	//connects to candaemon on tcp to send and receive packets

	static DaemonConnection dc;

	//a commandline arguments parser

	static Arguments CommandLine;

	//functions for downloading hex to target

	static Downloader dl;

	//maintains a hexfile

	private static HexFile hf;

	static bool aBios=false;		//if commandline says it is a bios update

	static bool aReset=false;		//if commandline says a reset should be sent before downloading to target

	static bool aStart=false;		//if commandline says a start should be sent after downloading to target

	static bool aTerminal=false;	//if commandline says we should start in interactive mode

	static bool sNodeid=false;		//true when a nodeid has been parsed

	static bool sHexfile=false;		//true when a hexfile has been specified

	static string hexfile=null;		//path to a hexfile

	static byte nodeid=0;			//id of current node

	static string host=null;		//address of candaemon-host

	static int port=1200;			//port of candaemon-host

	static void Main(string[] args) {

		bool error = false;

		if (args.Length < 4) {

			//if to few arguments then print info and quit

			printSyntax();

			error = true;

		} 

		if (!error) {

			//parse commandline arguments

			CommandLine=new Arguments(args);

			//check single arguments

			if (CommandLine["b"] == "true") { aBios = true; }

			if (CommandLine["r"] == "true") { aReset = true; }

			if (CommandLine["s"] == "true") { aStart = true; }

			if (CommandLine["t"] == "true") { aTerminal = true; }

			//check hexfile argument

			hexfile = CommandLine["f"];

			if (hexfile != null) {

				sHexfile = true;

			}

			if (!aTerminal && !sHexfile) {

				if (DEBUG_LEVEL>0) { Console.WriteLine("When not in terminal mode a hexfile must be supplied, I quit"); }

				error = true;

			} 

			//check nodeid argument

			string node = CommandLine["n"];

			if (node != null) {

				if (!parseNodeId(node)) {

					error = true;

				}

			}

			if (!aTerminal && !sNodeid) {

				if (DEBUG_LEVEL>0) { Console.WriteLine("When not in terminal mode a nodeid must be supplied, I quit"); }

				error = true;

			} 

			//check host and port arguments

			host = CommandLine["h"];

			string sPort = CommandLine["p"];

			if ((host == null) || (sPort.Length == 0)) {

				if (DEBUG_LEVEL>0) { printSyntax(); }

				error = true;

			} else {

				try {

					port = int.Parse(sPort);

				} catch {

					if (DEBUG_LEVEL>0) { Console.WriteLine("Was not able to parse port, I quit"); }

					error = true;

				}

			}

		}

		if  (!error) {

			//commandline feedback output

			if (DEBUG_LEVEL>2) { 

				Console.WriteLine("canDude settings:");

				if (sNodeid) { Console.WriteLine("Nodeaddress: 0x" + String.Format("{0:x2}", nodeid)); }

				Console.WriteLine("Host: {0}:{1}", host, port);

				if (hexfile != null) { Console.WriteLine("Hexfile: {0}", hexfile); }

				Console.Write("Parameters: ");

				if (aBios) { Console.Write("Bios "); }

				if (aReset) { Console.Write("Reset "); }

				if (aStart) { Console.Write("Start "); }

				if (aTerminal) { Console.Write("Terminal"); }

				Console.WriteLine("");

			}

		}

		if (!error) {

			//connect to candaemon

			dc = new DaemonConnection();

			if (dc.init(host, port)) {

				if (DEBUG_LEVEL>1) { Console.WriteLine("Connected to candaemon"); }

			} else { 

				if (DEBUG_LEVEL>0) { Console.WriteLine("Connection to candaemon could not be established, I quit"); }

				error = true; 

			}

		}

		if (!error && aTerminal) {

			//terminal mode (==interactive mode)

			bool success = true;

			//load hexfile if one has been specified as commandline argument

			hf = new HexFile();

			if (sHexfile && success) {

				if (hf.loadHex(hexfile)) {

					if (DEBUG_LEVEL>1) { Console.WriteLine("Hexfile loaded"); }

				} else { success = false; }

			}

			if (success) {

				if (DEBUG_LEVEL>1) {

					Console.WriteLine("");

					printHelp();		//print available commands

					Console.WriteLine("");

				}

				string instr;

				do {

					Console.Write("> ");			//a command has been executed, print a new console char

					instr = Console.ReadLine();		//read std in

				} while (parseInput(instr));		//parse a line from std in

				//exit command

			}

		}

		if (!error && !aTerminal) {

			//not terminal mode

			bool success = true;

			//load hexfile (a hexfile must be supplied as commandline argument)

			hf = new HexFile();

			if (hf.loadHex(hexfile)) {

				if (DEBUG_LEVEL>1) { Console.WriteLine("Hexfile loaded"); }

			} else { 

				success = false;

				if (DEBUG_LEVEL>0) { Console.WriteLine("Hexfile could not be loaded, I quit"); }

			}

			//if a hexfile is loaded then start autodownloading sequence

			if (success) {

				bool autosuccess = true;

				CanNMT cpn = new CanNMT();

				if (aReset) {

					//send a reset command (and wait for feedback)

					if (!cpn.doReset(dc, nodeid)) {

						if (DEBUG_LEVEL>0) { Console.WriteLine("Target node did not respond to reset, I quit"); }

						autosuccess = false;

					}

				}

				if (autosuccess) {

					//send application

					dl = new Downloader(hf, dc, nodeid, aBios);

					if (!dl.go()) { 

						if (DEBUG_LEVEL>0) { Console.WriteLine("Error occured during download"); }

						autosuccess = false;

					}

				}

				if (autosuccess && aStart) {

					//start application

					cpn.doStart(dc, nodeid);

				}

			}

		}

		if (dc != null) {

			//stop tcp client thread

			dc.stop();

		}

	}

	static private void printSyntax() {

		Console.WriteLine("Syntax: program.exe [options] -h <host> -p <port>");

		Console.WriteLine("Host and port are host and port of canDaemon, most likely localhost and 1200.");

		Console.WriteLine("Options:");

		Console.WriteLine("  -f <hexfile>   Specify a file to be loaded to target.");

		Console.WriteLine("  -n <nodeid>    Id of target node, hex or decimal.");

		Console.WriteLine("  -t             Enter terminal mode.");

		Console.WriteLine("  -r             Reset node before loading target.");

		Console.WriteLine("  -s             Start node after loading target.");

		Console.WriteLine("  -b             Program hex as bios, use with caution.");

	}

	static private void printHelp() {

		Console.WriteLine("canDude commands:");

		Console.WriteLine("load [<hexfile>] - reload hexfile or load new hexfile");

		Console.WriteLine("node <nodeid>    - specify id of target node, hex or decimal");

		Console.WriteLine("reset            - reset node");

		Console.WriteLine("start            - start application in node (no feedback yet)");

		Console.WriteLine("go               - start download application to target");

		Console.WriteLine("go bios          - start download bios to target, use with caution");

		Console.WriteLine("help             - prints this help");

		Console.WriteLine("exit or quit     - exit program");

	}	

	static private bool parseNodeId(string node) {

		// the goal here is to find a byte from 0-255 in a string, format in decimal (0-255) or in hex (0x0-0xff)

		// this is probably not done very neat

		sNodeid = false;

		if (node.Length > 0) {

			try {

				nodeid = byte.Parse(node);

				sNodeid = true;

			} catch {}

		}

		if (node.Length > 2) {

			if (node.Substring(0, 2).Equals("0x")) {

				if (node.Length == 3) {

					try {

						nodeid = byte.Parse(node.Substring(2, 1), System.Globalization.NumberStyles.HexNumber);

						sNodeid = true;

					} catch {

						if (DEBUG_LEVEL>0) { Console.WriteLine("nodeadress parse error 1"); }

						return false;

					}

				} else if (node.Length == 4) {

					try {

						nodeid = byte.Parse(node.Substring(2, 2), System.Globalization.NumberStyles.HexNumber);

						sNodeid = true;

					} catch {

						if (DEBUG_LEVEL>0) { Console.WriteLine("nodeadress parse error 2"); }

						return false;

					}

				} else {

					if (DEBUG_LEVEL>0) { Console.WriteLine("nodeadress parse error 3"); }

					return false;

				}

			}

		}

		return true;

	}

	static private bool parseInput(string instr) {

		//parse commands entered on std in

		if (instr.Equals("reset")) {		//reset command, send a reset to current node

			if (sNodeid) {

				dc.flushData();

				CanNMT cpn = new CanNMT();

				cpn.doReset(dc, nodeid);

			} else {

				if (DEBUG_LEVEL>0) { Console.WriteLine("No nodeid has been specified"); }

			}

		}

		else if (instr.Equals("start")) {	//start command, send a start to current node

			if (sNodeid) {

				CanNMT cpn = new CanNMT();

				cpn.doStart(dc, nodeid);

			} else {

				if (DEBUG_LEVEL>0) { Console.WriteLine("No nodeid has been specified"); }

			}

		}

		else if (instr.StartsWith("go")) {	//downloading command

			bool dlBios = false;

			bool error = true;

			if (instr.Equals("go bios")) {	//if bios should be downloaded

				dlBios = true;

				error = false;

			} else if (instr.Equals("go")) {	//is an application should be downloaded

				error = false;

			}

			if (!sNodeid) {

				if (DEBUG_LEVEL>0) { Console.WriteLine("No nodeid has been specified"); }

				error = true;

			}

			if (!sHexfile) {

				if (DEBUG_LEVEL>0) { Console.WriteLine("No hexfile has been specified"); }

				error = true;

			}

			CanNMT cpn = new CanNMT();

			if (!error && aReset) {				//commandline arguments specified that a reset should be done before download

				//send a reset command (and wait for feedback)

				if (!cpn.doReset(dc, nodeid)) {

					if (DEBUG_LEVEL>0) { Console.WriteLine("Target node did not respond to reset"); }

					error = true;

				}

			}

			if (!error) {

				//send application

				dc.flushData();

				dl = new Downloader(hf, dc, nodeid, dlBios);

				if (!dl.go()) { 

					if (DEBUG_LEVEL>0) { Console.WriteLine("Error occured during download"); }

					error = true;

				}

			}

			if (!error && aStart) {				//commandline arguments specified that a start should be done after download

				//start applikation

				cpn.doStart(dc, nodeid);

			}

		}

		else if (instr.StartsWith("load")) {	//load hexfile or reload current hexfile

			if (instr.Length > 5) {

				//second argument is a hexfile, this file should be loaded

				hexfile = instr.Substring(5);

				if (hf.loadHex(hexfile)) {

					sHexfile = true;

					if (DEBUG_LEVEL>1) { Console.WriteLine("Hexfile loaded"); }

				} else { 

					if (DEBUG_LEVEL>0) { Console.WriteLine("Hexfile could not be loaded"); }

				}

			} else {

				//reload current hexfile. if a hexfile already has been specified

				if (sHexfile) {

					if (hf.loadHex(hexfile)) {

						if (DEBUG_LEVEL>1) { Console.WriteLine("Hexfile reloaded"); }

					} else { 

						if (DEBUG_LEVEL>0) { Console.WriteLine("Hexfile could not be reloaded"); }

					}

				} else {

					if (DEBUG_LEVEL>0) { Console.WriteLine("No hexfile has been specified"); }

				}

			}

		}

		else if (instr.StartsWith("node")) {

			//change nodeid

			if (instr.Length > 5) {

				//second argument is nodeid

				string node = instr.Substring(5);

				parseNodeId(node);

			}

			if (DEBUG_LEVEL>1) { Console.WriteLine("NodeId is 0x"+ String.Format("{0:x2}", nodeid)); }

		}

		else if (instr.Equals("help")) {

			printHelp();

		}

		else if (instr.Equals("exit") || instr.Equals("quit") || instr.Equals("q")) {

			return false;

		}

		else {

			Console.WriteLine("Unknown command.");

		}

		return true;

	}

}