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# Published Jan 2013
# Revised Jan 2014 (to add new modules data)
# Author : Philippe Larduinat, philippelt@users.sourceforge.net
# Public domain source code

# This API provides access to the Netatmo (Internet weather station) devices
# This package can be used with Python2 or Python3 applications and do not
# require anything else than standard libraries

# PythonAPI Netatmo REST data access
# coding=utf-8

from sys import version_info
import json, time

# HTTP libraries depends upon Python 2 or 3
if version_info.major == 3 :
    import urllib.parse, urllib.request
else:
    from urllib import urlencode
    import urllib2

######################## USER SPECIFIC INFORMATION ######################

# To be able to have a program accessing your netatmo data, you have to register your program as
# a Netatmo app in your Netatmo account. All you have to do is to give it a name (whatever) and you will be
# returned a client_id and secret that your app has to supply to access netatmo servers.

_CLIENT_ID     = ""   # Your client ID from Netatmo app registration at http://dev.netatmo.com/dev/listapps
_CLIENT_SECRET = ""   # Your client app secret   '     '
_USERNAME      = ""   # Your netatmo account username
_PASSWORD      = ""   # Your netatmo account password

#########################################################################


# Common definitions

_BASE_URL       = "https://api.netatmo.net/"
_AUTH_REQ       = _BASE_URL + "oauth2/token"
_GETUSER_REQ    = _BASE_URL + "api/getuser"
_DEVICELIST_REQ = _BASE_URL + "api/devicelist"
_GETMEASURE_REQ = _BASE_URL + "api/getmeasure"


class ClientAuth:
    "Request authentication and keep access token available through token method. Renew it automatically if necessary"

    def __init__(self, clientId=_CLIENT_ID,
                       clientSecret=_CLIENT_SECRET,
                       username=_USERNAME,
                       password=_PASSWORD):

        postParams = {
                "grant_type" : "password",
                "client_id" : clientId,
                "client_secret" : clientSecret,
                "username" : username,
                "password" : password,
                "scope" : "read_station"
                }
        resp = postRequest(_AUTH_REQ, postParams)

        self._clientId = clientId
        self._clientSecret = clientSecret
        self._accessToken = resp['access_token']
        self.refreshToken = resp['refresh_token']
        self._scope = resp['scope']
        self.expiration = int(resp['expire_in'] + time.time())

    @property
    def accessToken(self):

        if self.expiration < time.time(): # Token should be renewed

            postParams = {
                    "grant_type" : "refresh_token",
                    "refresh_token" : self.refreshToken,
                    "client_id" : self._clientId,
                    "client_secret" : self._clientSecret
                    }
            resp = postRequest(_AUTH_REQ, postParams)

            self._accessToken = resp['access_token']
            self.refreshToken = resp['refresh_token']
            self.expiration = int(resp['expire_in'] + time.time())

        return self._accessToken

class User:

    def __init__(self, authData):

        postParams = {
                "access_token" : authData.accessToken
                }
        resp = postRequest(_GETUSER_REQ, postParams)
        self.rawData = resp['body']
        self.id = self.rawData['_id']
        self.devList = self.rawData['devices']
        self.ownerMail = self.rawData['mail']

class DeviceList:

    def __init__(self, authData):

        self.getAuthToken = authData.accessToken
        postParams = {
                "access_token" : self.getAuthToken,
                "app_type" : "app_station"
                }
        resp = postRequest(_DEVICELIST_REQ, postParams)
        self.rawData = resp['body']
        self.stations = { d['_id'] : d for d in self.rawData['devices'] }
        self.modules = { m['_id'] : m for m in self.rawData['modules'] }
        self.default_station = list(self.stations.values())[0]['station_name']

    def modulesNamesList(self, station=None):
        res = [m['module_name'] for m in self.modules.values()]
        res.append(self.stationByName(station)['module_name'])
        return res

    def stationByName(self, station=None):
        if not station : station = self.default_station
        for i,s in self.stations.items():
            if s['station_name'] == station : return self.stations[i]
        return None

    def stationById(self, sid):
        return None if sid not in self.stations else self.stations[sid]

    def moduleByName(self, module, station=None):
        s = None
        if station :
            s = self.stationByName(station)
            if not s : return None
        for m in self.modules:
            mod = self.modules[m]
            if mod['module_name'] == module :
                if not s or mod['main_device'] == s['_id'] : return mod
        return None

    def moduleById(self, mid, sid=None):
        s = self.stationById(sid) if sid else None
        if mid in self.modules :
            return self.modules[mid] if not s or self.modules[mid]['main_device'] == s['_id'] else None

    def lastData(self, station=None, exclude=0):
        s = self.stationByName(station)
        if not s : return None
        lastD = dict()
        # Define oldest acceptable sensor measure event
        limit = (time.time() - exclude) if exclude else 0
        ds = s['dashboard_data']
        if ds['time_utc'] > limit :
            lastD[s['module_name']] = ds.copy()
            lastD[s['module_name']]['When'] = lastD[s['module_name']].pop("time_utc")
            lastD[s['module_name']]['wifi_status'] = s['wifi_status']
        for mId in s["modules"]:
            ds = self.modules[mId]['dashboard_data']
            if ds['time_utc'] > limit :
                mod = self.modules[mId]
                lastD[mod['module_name']] = ds.copy()
                lastD[mod['module_name']]['When'] = lastD[mod['module_name']].pop("time_utc")
                # For potential use, add battery and radio coverage information to module data if present
                for i in ('battery_vp', 'rf_status') :
                    if i in mod : lastD[mod['module_name']][i] = mod[i]
        return lastD

    def checkNotUpdated(self, station=None, delay=3600):
        res = self.lastData(station)
        ret = []
        for mn,v in res.items():
            if time.time()-v['When'] > delay : ret.append(mn)
        return ret if ret else None

    def checkUpdated(self, station=None, delay=3600):
        res = self.lastData(station)
        ret = []
        for mn,v in res.items():
            if time.time()-v['When'] < delay : ret.append(mn)
        return ret if ret else None

    def getMeasure(self, device_id, scale, mtype, module_id=None, date_begin=None, date_end=None, limit=None, optimize=False, real_time=False):
        postParams = { "access_token" : self.getAuthToken }
        postParams['device_id']  = device_id
        if module_id : postParams['module_id'] = module_id
        postParams['scale']      = scale
        postParams['type']       = mtype
        if date_begin : postParams['date_begin'] = date_begin
        if date_end : postParams['date_end'] = date_end
        if limit : postParams['limit'] = limit
        postParams['optimize'] = "true" if optimize else "false"
        postParams['real_time'] = "true" if real_time else "false"
        return postRequest(_GETMEASURE_REQ, postParams)

    def MinMaxTH(self, station=None, module=None, frame="last24"):
        if not station : station = self.default_station
        s = self.stationByName(station)
        if not s :
            s = self.stationById(station)
            if not s : return None
        if frame == "last24":
            end = time.time()
            start = end - 24*3600 # 24 hours ago
        elif frame == "day":
            start, end = todayStamps()
        if module and module != s['module_name']:
            m = self.moduleByName(module, s['station_name'])
            if not m :
                m = self.moduleById(s['_id'], module)
                if not m : return None
            # retrieve module's data
            resp = self.getMeasure(
                    device_id  = s['_id'],
                    module_id  = m['_id'],
                    scale      = "max",
                    mtype      = "Temperature,Humidity",
                    date_begin = start,
                    date_end   = end)
        else : # retrieve station's data
            resp = self.getMeasure(
                    device_id  = s['_id'],
                    scale      = "max",
                    mtype      = "Temperature,Humidity",
                    date_begin = start,
                    date_end   = end)
        if resp:
            T = [v[0] for v in resp['body'].values()]
            H = [v[1] for v in resp['body'].values()]
            return min(T), max(T), min(H), max(H)
        else:
            return None

# Utilities routines

def postRequest(url, params):
    if version_info.major == 3:
        req = urllib.request.Request(url)
        req.add_header("Content-Type","application/x-www-form-urlencoded;charset=utf-8")
        params = urllib.parse.urlencode(params).encode('utf-8')
        resp = urllib.request.urlopen(req, params).readall().decode("utf-8")
    else:
        params = urlencode(params)
        headers = {"Content-Type" : "application/x-www-form-urlencoded;charset=utf-8"}
        req = urllib2.Request(url=url, data=params, headers=headers)
        resp = urllib2.urlopen(req).read()
    return json.loads(resp)

def toTimeString(value):
    return time.strftime("%Y-%m-%d_%H:%M:%S", time.localtime(int(value)))

def toEpoch(value):
    return int(time.mktime(time.strptime(value,"%Y-%m-%d_%H:%M:%S")))

def todayStamps():
    today = time.strftime("%Y-%m-%d")
    today = int(time.mktime(time.strptime(today,"%Y-%m-%d")))
    return today, today+3600*24

# Global shortcut

def getStationMinMaxTH(station=None, module=None):
    authorization = ClientAuth()
    devList = DeviceList(authorization)
    if not station : station = devList.default_station
    if module :
        mname = module
    else :
        mname = devList.stationByName(station)['module_name']
    lastD = devList.lastData(station)
    if mname == "*":
        result = dict()
        for m in lastD.keys():
            if time.time()-lastD[m]['When'] > 3600 : continue
            r = devList.MinMaxTH(module=m)
            result[m] = (r[0], lastD[m]['Temperature'], r[1])
    else:
        if time.time()-lastD[mname]['When'] > 3600 : result = ["-", "-"]
        else : result = [lastD[mname]['Temperature'], lastD[mname]['Humidity']]
        result.extend(devList.MinMaxTH(station, mname))
    return result

# auto-test when executed directly

if __name__ == "__main__":

    from sys import exit, stdout, stderr
    
    if not _CLIENT_ID or not _CLIENT_SECRET or not _USERNAME or not _PASSWORD :
           stderr.write("Library source missing identification arguments to check lnetatmo.py (user/password/etc...)")
           exit(1)
    
    authorization = ClientAuth()                # Test authentication method
    user = User(authorization)                  # Test GETUSER
    devList = DeviceList(authorization)         # Test DEVICELIST
    devList.MinMaxTH()                          # Test GETMEASURE
    
    # If we reach this line, all is OK
    
    # If launched interactively, display OK message
    if stdout.isatty():
        print("lnetatmo.py : OK")
    
    exit(0)