#!/usr/bin/python3
# 
# Copyright 2017 ghostop14
# 
# This 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 3, or (at your option)
# any later version.
# 
# This software 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 software; see the file COPYING.  If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
# 

import os
#import subprocess
#import re
import socket
from contextlib import closing
#from gps3 import gps3
from gps3.agps3threaded import AGPS3mechanism
from time import sleep
from threading import Thread

class GPSThread(Thread):
    def __init__(self, gpsEngine):
        super(GPSThread, self).__init__()
        self.signalStop = False
        self.threadRunning = False
        self.mainEngine = gpsEngine

        self.agps_thread = AGPS3mechanism()  # Instantiate AGPS3 Mechanisms
        self.agps_thread.stream_data()  # From localhost (), or other hosts, by example, (host='gps.ddns.net')
        self.agps_thread.run_thread()  # Throttle time to sleep after an empty lookup, default '()' 0.2 two tenths of a second
        self.daemon = True

    def run(self):
        self.threadRunning = True
        
        while (not self.signalStop):
            try:
                gpsResult = SparrowGPS()
                
                try:
                    if (type(self.agps_thread.data_stream.alt) != str):
                        try:
                            gpsResult.altitude = float(self.agps_thread.data_stream.alt)
                        except:
                            gpsResult.altitude = 0.0
                    else:
                        gpsResult.altitude = 0.0
                    
                    try:
                        gpsResult.latitude = float(self.agps_thread.data_stream.lat)
                        gpsResult.longitude = float(self.agps_thread.data_stream.lon)
                    except:
                        gpsResult.latitude = 0.0
                        gpsResult.longitude = 0.0
                        
                    try:
                        gpsResult.speed = float(self.agps_thread.data_stream.speed)
                    except:
                        gpsResult.speed = 0.0
                        
                    gpsResult.isValid = True
                except:
                    gpsResult.isValid = False
                    
                self.mainEngine.onGPSResult(gpsResult)
                        
            except:
                pass

            sleep(0.3)
            
        self.agps_thread.stop()
        self.threadRunning = False


class SparrowGPS(object):
    def __init__(self):
        super().__init__()
        
        self.latitude = 0.0
        self.longitude = 0.0
        self.altitude = 0.0
        self.speed = 0.0
        self.isValid = False
        
    def __str__(self):
        retVal = ""
        
        retVal += "Is Valid: " +str(self.isValid) + "\n"
        retVal += "Latitude: " +str(self.latitude) + "\n"
        retVal += "Longitude: " +str(self.longitude) + "\n"
        retVal += "Altitude: " +str(self.altitude) + "\n"
        retVal += "Speed: " +str(self.speed) + "\n"

        return retVal

    def __eq__(self, obj):
        # This is equivance....   ==
        if not isinstance(obj, SparrowGPS):
           return False
          
        if self.isValid != obj.isValid:
            return False

        if self.latitude != obj.latitude:
            return False

        if self.longitude != obj.longitude:
            return False
            
        if self.speed != obj.speed:
            return False
            
        return True

    def __ne__(self, other):
            return not self.__eq__(other)
            
    def copy(self, other):
        self.latitude = other.latitude
        self.longitude = other.longitude
        self.altitude = other.altitude
        self.speed = other.speed
        self.isValid = other.isValid
        
class GPSStatus(object):
    def __init__(self):
        super().__init__()
        self.gpsInstalled = False
        self.gpsRunning = False
        self.isValid = False
        self.latitude = 0.0
        self.longitude = 0.0
        self.altitude = 0.0
        self.speed = 0.0
        
    def asSparrowGPSObject(self):
        retVal = SparrowGPS()
        retVal.isValid = self.isValid
        retVal.latitude = self.latitude
        retVal.latitude = self.longitude
        retVal.latitude = self.altitude
        retVal.latitude = self.speed

        return retVal
        
class GPSEngine(object):
    def __init__(self):
        super().__init__()
        
        self.lastCoord = None
        
        self.gpsThread = None
        
        if GPSEngine.GPSDRunning():
            self.gpsAvailable = True
        else:
            self.gpsAvailable = False

    def getLastCoord(self):
        return self.lastCoord
        
    def gpsValid(self):
        if self.lastCoord is None:
            return False
            
        return self.lastCoord.isValid
        
    def onGPSResult(self, gpsResult):
        self.lastCoord = gpsResult
        
    def start(self):
        self.gpsThread = GPSThread(self)
        self.gpsThread.start()

    def stop(self):
        if self.gpsThread and self.gpsThread.threadRunning:
            self.gpsThread.signalStop = True
            maxIterations = 10
            i=0
            while self.gpsThread.threadRunning and i < maxIterations:
                sleep(0.1)
                i += 1
            
    def engineRunning(self):
        if self.gpsThread is None:
            return False
            
        return self.gpsThread.threadRunning
        
    def GPSDInstalled():
        if os.path.isfile('/usr/sbin/gpsd'):
            return True
        else:
            if os.path.isfile('/usr/local/sbin/gpsd'):
                return True
            else:
                return False
                
    def GPSDRunning():
        # ps = subprocess.Popen("ps aux | grep gpsd | grep -v grep", shell=True, stdout=subprocess.PIPE)
        # output = ps.stdout.read()
        # ps.stdout.close()
        # ps.wait()

        # gpsResult = output.decode('ASCII')

        # if re.search('/gpsd', gpsResult) is None:
        #    return False
        #else:
        #    return True
        # gps_socket = gps3.GPSDSocket()
        try:
            # gps_socket.connect()
            # gps_socket.close()
            
            with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sock:
                if sock.connect_ex(('127.0.0.1', 2947)) == 0:
                    return True
                else:
                    return False
        except:
            return False
           
class GPSEngineStatic(GPSEngine):
    def __init__(self, latitude, longitude, altitude):
        super().__init__()
        
        self.lastCoord = SparrowGPS()
        
        self.lastCoord.latitude = latitude
        self.lastCoord.longitude = longitude
        self.lastCoord.altitude = altitude
        self.lastCoord.speed = 0.0
        self.lastCoord.isValid = True
        
        self.gpsAvailable = True

    def getLastCoord(self):
        return self.lastCoord
        
    def gpsValid(self):
        return True
        
    def start(self):
        pass

    def stop(self):
        pass
            
    def engineRunning(self):
        return True
        
    def GPSDInstalled():
        if os.path.isfile('/usr/sbin/gpsd'):
            return True
        else:
            if os.path.isfile('/usr/local/sbin/gpsd'):
                return True
            else:
                return False
                
    def GPSDRunning():
        try:
            with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sock:
                if sock.connect_ex(('127.0.0.1', 2947)) == 0:
                    return True
                else:
                    return False
        except:
            return False