#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# AWL simulator - Client interface
#
# Copyright 2013-2019 Michael Buesch <m@bues.ch>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#

from __future__ import division, absolute_import, print_function, unicode_literals

import sys
import getopt

from awlsim_loader.common import *
from awlsim_loader.coreclient import *


def printCpuStats(cpuStatsMsg):
	if not cpuStatsMsg:
		print("Failed to fetch CPU statistics.")
		return

	if cpuStatsMsg.insnPerSecond > 0.0:
		insnPerSecondStr = floatToHumanReadable(cpuStatsMsg.insnPerSecond)
		usPerInsnStr = "%.03f" % ((1.0 / cpuStatsMsg.insnPerSecond) * 1000000.0)
	else:
		insnPerSecondStr = "-/-"
		usPerInsnStr = "-/-"

	if (cpuStatsMsg.avgCycleTime <= 0.0 or
	    cpuStatsMsg.minCycleTime <= 0.0 or
	    cpuStatsMsg.maxCycleTime <= 0.0):
		avgCycleTimeStr = minCycleTimeStr = maxCycleTimeStr = "-/-"
	else:
		avgCycleTimeStr = "%.03f" % (cpuStatsMsg.avgCycleTime * 1000.0)
		minCycleTimeStr = "%.03f" % (cpuStatsMsg.minCycleTime * 1000.0)
		maxCycleTimeStr = "%.03f" % (cpuStatsMsg.maxCycleTime * 1000.0)

	if cpuStatsMsg.running:
		print("CPU RUN %.01f s (system uptime %.01f s)" % (
		      cpuStatsMsg.runtime, cpuStatsMsg.uptime))
	else:
		print("CPU STOP (system uptime %.01f s)" % (
		      cpuStatsMsg.uptime))
	print("    OB1:  avg: %s ms  min: %s ms  max: %s ms" % (
	      avgCycleTimeStr, minCycleTimeStr, maxCycleTimeStr))
	print("  Speed:  %s stmt/s (= %s us/stmt)  %.01f stmt/cycle" % (
	      insnPerSecondStr, usPerInsnStr, cpuStatsMsg.insnPerCycle))

class TextInterfaceAwlSimClient(AwlSimClient):
	pass

def usage():
	print("awlsim-client version %s" % VERSION_STRING)
	print("")
	print("Usage: awlsim-client [OPTIONS] <ACTIONS>")
	print("")
	print("Options:")
	print(" -c|--connect HOST[:PORT]     Connect to the server at HOST:PORT")
	print("                              Defaults to %s:%d" % (
	      AwlSimServer.DEFAULT_HOST, AwlSimServer.DEFAULT_PORT))
	print(" -t|--timeout 10.0            Set the connection timeout (default 10 s)")
	print(" -L|--loglevel LVL            Set the client log level:")
	print("                              0: Log nothing")
	print("                              1: Log errors")
	print("                              2: Log errors and warnings (default)")
	print("                              3: Log errors, warnings and info messages")
	print("                              4: Verbose logging")
	print("                              5: Extremely verbose logging")
	print("")
	print(" -s|--ssh-tunnel              Establish the connection via SSH tunnel.")
	print(" -P|--ssh-passphrase XYZ      Use XYZ as SSH passphrase.")
	print("                              Default: Ask user.")
	print(" --ssh-user %s                SSH user. Default: %s" % (
	      SSHTunnel.SSH_DEFAULT_USER, SSHTunnel.SSH_DEFAULT_USER))
	print(" --ssh-port %s                SSH port. Default: %s" % (
	      SSHTunnel.SSH_PORT, SSHTunnel.SSH_PORT))
	print(" --ssh-localport auto         SSH localport number or 'auto'.")
	print(" --ssh-exe %s                SSH client executable path. Default: %s" % (
	      SSHTunnel.SSH_DEFAULT_EXECUTABLE, SSHTunnel.SSH_DEFAULT_EXECUTABLE))
	print("")
	print("Actions to be performed on the server:")
	print(" -r|--runstate RUN/STOP       Set the run state of the CPU.")
	print(" -S|--stats                   Fetch and display CPU statistics.")
	print(" --meas-start                 Start instruction time measurements.")
	print(" --meas-stop                  Stop instruction time measurements.")
	print(" --shutdown                   Shutdown the core server system.")
	print(" --reboot                     Reboot the core server system.")

def main():
	opt_connect = (AwlSimServer.DEFAULT_HOST, AwlSimServer.DEFAULT_PORT)
	opt_timeout = 10.0
	opt_loglevel = Logging.LOG_WARNING
	opt_sshTunnel = False
	opt_sshPassphrase = None
	opt_sshUser = SSHTunnel.SSH_DEFAULT_USER
	opt_sshPort = SSHTunnel.SSH_PORT
	opt_sshLocalPort = None
	opt_sshExe = SSHTunnel.SSH_DEFAULT_EXECUTABLE
	actions = []

	try:
		(opts, args) = getopt.getopt(sys.argv[1:],
			"hc:t:L:sP:r:S",
			[ "help", "connect=", "timeout=", "loglevel=",
			  "ssh-tunnel", "ssh-passphrase=", "ssh-user=", "ssh-port=", "ssh-localport=", "ssh-exe=",
			  "runstate=", "stats", "meas-start", "meas-stop", "shutdown", "reboot", ])
	except getopt.GetoptError as e:
		printError(str(e))
		usage()
		return ExitCodes.EXIT_ERR_CMDLINE
	for (o, v) in opts:
		if o in ("-h", "--help"):
			usage()
			return ExitCodes.EXIT_OK
		if o in ("-c", "--connect"):
			try:
				host, port = parseNetAddress(v)
				if port is None:
					port = AwlSimServer.DEFAULT_PORT
				opt_connect = (host, port)
			except AwlSimError as e:
				printError("-c|--connect: %s" % e.message)
				sys.exit(1)
		if o in ("-t", "--timeout"):
			try:
				opt_timeout = float(v)
			except ValueError:
				printError("-t|--timeout: Invalid timeout value")
				sys.exit(1)
		if o in ("-L", "--loglevel"):
			try:
				opt_loglevel = int(v)
			except ValueError:
				printError("-L|--loglevel: Invalid log level")
				sys.exit(1)
		if o in ("-s", "--ssh-tunnel"):
			opt_sshTunnel = True
		if o in ("-P", "--ssh-passphrase"):
			opt_sshPassphrase = v
		if o == "--ssh-user":
			opt_sshUser = v
		if o == "--ssh-port":
			try:
				opt_sshPort = int(v)
			except ValueError:
				printError("--ssh-port: Invalid port number")
				sys.exit(1)
		if o == "--ssh-localport":
			try:
				if v.lower().strip() == "auto":
					opt_sshLocalPort = None
				else:
					opt_sshLocalPort = int(v)
			except ValueError:
				printError("--ssh-localport: Invalid port number")
				sys.exit(1)
		if o == "--ssh-exe":
			opt_sshExe = v
		if o in ("-r", "--runstate"):
			if v.upper().strip() in ("RUN", "1", "START"):
				actions.append(("runstate", True))
			elif v.upper().strip() in ("STOP", "0"):
				actions.append(("runstate", False))
			else:
				printError("-r|--runstate: Invalid run state")
				sys.exit(1)
		if o in ("-S", "--stats"):
			actions.append(("stats", None))
		if o == "--meas-start":
			actions.append(("meas-start", None))
		if o == "--meas-stop":
			actions.append(("meas-stop", None))
		if o == "--shutdown":
			actions.append(("shutdown", None))
		if o == "--reboot":
			actions.append(("reboot", None))
	if args:
		usage()
		return ExitCodes.EXIT_ERR_CMDLINE
	if not actions:
		usage()
		return ExitCodes.EXIT_ERR_CMDLINE

	client = None
	try:
		Logging.setLoglevel(opt_loglevel)

		host, port = opt_connect

		if opt_sshTunnel:
			printInfo("Establishing SSH tunnel...")
			tunnel = SSHTunnel(
				remoteHost=host,
				remotePort=port,
				localPort=opt_sshLocalPort,
				sshUser=opt_sshUser,
				sshPort=opt_sshPort,
				sshExecutable=opt_sshExe,
				sshPassphrase=opt_sshPassphrase
			)
			host, port = tunnel.connect()

		client = TextInterfaceAwlSimClient()
		client.connectToServer(host=host,
				       port=port,
				       timeout=opt_timeout)

		for action, actionValue in actions:
			if action == "runstate":
				client.setRunState(actionValue)
			elif action == "stats":
				printCpuStats(client.getCpuStats(sync=True))
			elif action == "meas-start":
				if not client.measStart():
					printError("Failed to start measurements.")
			elif action == "meas-stop":
				reportData = client.measStop()
				if reportData:
					sys.stdout.write(reportData)
					sys.stdout.flush()
				else:
					printError("Measurement failed. No data.")
			elif action == "shutdown":
				client.shutdownCoreServerSystem()
			elif action == "reboot":
				client.rebootCoreServerSystem()
			else:
				assert(0)
	except AwlSimError as e:
		printError(e.getReport())
		return ExitCodes.EXIT_ERR_SIM
	finally:
		if client:
			client.shutdown()

	return ExitCodes.EXIT_OK

if __name__ == "__main__":
	sys.exit(main())