from models import (Tweet, User, Hashtag, EntityHashtag, EntityUser, Url, 

    EntityUrl, CONSUMER_KEY, CONSUMER_SECRET, APPLICATION_NAME, ACCESS_TOKEN_KEY, 

    ACCESS_TOKEN_SECRET, adapt_date, adapt_json, TweetSource, TweetLog)

from sqlalchemy.sql import select, or_ #@UnresolvedImport

import anyjson #@UnresolvedImport

import datetime

import email.utils

import logging #@UnresolvedImport

import os.path

import sys

import twitter.oauth #@UnresolvedImport

import twitter.oauth_dance #@UnresolvedImport

import twitter_text #@UnresolvedImport

CACHE_ACCESS_TOKEN = {}

def get_oauth_token(token_file_path=None, application_name=APPLICATION_NAME, consumer_key=CONSUMER_KEY, consumer_secret=CONSUMER_SECRET):

    global CACHE_ACCESS_TOKEN

    if CACHE_ACCESS_TOKEN is not None and application_name in CACHE_ACCESS_TOKEN:

        return CACHE_ACCESS_TOKEN[application_name]

    if token_file_path and os.path.exists(token_file_path):

        logging.debug("reading token from file %s" % token_file_path) #@UndefinedVariable

        CACHE_ACCESS_TOKEN[application_name] = twitter.oauth.read_token_file(token_file_path)

        return CACHE_ACCESS_TOKEN[application_name]

        #read access token info from path

    if 'ACCESS_TOKEN_KEY' in dict() and 'ACCESS_TOKEN_SECRET' in dict() and ACCESS_TOKEN_KEY and ACCESS_TOKEN_SECRET:

        return ACCESS_TOKEN_KEY,ACCESS_TOKEN_SECRET

    CACHE_ACCESS_TOKEN[application_name] = twitter.oauth_dance.oauth_dance(application_name, consumer_key, consumer_secret, token_file_path)

    return CACHE_ACCESS_TOKEN[application_name]

def parse_date(date_str):

    ts = email.utils.parsedate_tz(date_str) #@UndefinedVariable

    return datetime.datetime(*ts[0:7])

def clean_keys(dict_val):

    return dict([(str(key),value) for key,value in dict_val.items()])

fields_adapter = {

    'stream': {

        "tweet": {

            "created_at"    : adapt_date,

            "coordinates"   : adapt_json,

            "place"         : adapt_json,

            "geo"           : adapt_json,

#            "original_json" : adapt_json,

        },

        "user": {

            "created_at"  : adapt_date,

        },

    },

    'rest': {

        "tweet" : {

            "place"         : adapt_json,

            "geo"           : adapt_json,

            "created_at"    : adapt_date,

#            "original_json" : adapt_json,

        }, 

    },

}

#

# adapt fields, return a copy of the field_dict with adapted fields

#

def adapt_fields(fields_dict, adapter_mapping):

    def adapt_one_field(field, value):

        if field in adapter_mapping and adapter_mapping[field] is not None:

            return adapter_mapping[field](value)

        else:

            return value

    return dict([(str(k),adapt_one_field(k,v)) for k,v in fields_dict.items()])    

class TwitterProcessorException(Exception):

    pass

class TwitterProcessor(object):

    def __init__(self, json_dict, json_txt, source_id, session, token_filename=None):

        if json_dict is None and json_txt is None:

            raise TwitterProcessorException("No json")

        if json_dict is None:

            self.json_dict = anyjson.deserialize(json_txt)

        else:

            self.json_dict = json_dict

        if not json_txt:

            self.json_txt = anyjson.serialize(json_dict)

        else:

            self.json_txt = json_txt

        if "id" not in self.json_dict:

            raise TwitterProcessorException("No id in json")

        self.source_id = source_id

        self.session = session

        self.token_filename = token_filename

    def __get_user(self, user_dict):

        user_id = user_dict.get("id",None)    

        user_name = user_dict.get("screen_name", user_dict.get("name", None))

        if user_id is None and user_name is None:

            return None

        if user_id:

            user = self.session.query(User).filter(User.id == user_id).first()

        else:

            user = self.session.query(User).filter(User.screen_name == user_name).first()

        if user is not None:

            return user

        user_created_at = user_dict.get("created_at", None)

        if user_created_at is None:

            acess_token_key, access_token_secret = get_oauth_token(self.token_filename)

            t = twitter.Twitter(auth=twitter.OAuth(acess_token_key, access_token_secret, CONSUMER_KEY, CONSUMER_SECRET))

            try:

                if user_id:

                    user_dict = t.users.show(user_id=user_id)

                else:

                    user_dict = t.users.show(screen_name=user_name)            

            except Exception as e:

        user_dict = adapt_fields(user_dict, fields_adapter["stream"]["user"])

        if "id" not in user_dict:

            return None

        user = User(**user_dict)

        self.session.add(user)

        self.session.flush()

        return user 

    def __process_entity(self, ind, ind_type):

        ind = clean_keys(ind)

        entity_dict = {

           "indice_start": ind["indices"][0],

           "indice_end"  : ind["indices"][1],

           "tweet_id"    : self.tweet.id,

           "tweet"       : self.tweet

        }

        def process_hashtags():

            text = ind.get("text", ind.get("hashtag", None))

            if text is None:

                return None 

            hashtag = self.session.query(Hashtag).filter(Hashtag.text == text).first()

            if not hashtag:

                ind["text"] = text

                hashtag = Hashtag(**ind)

                self.session.add(hashtag)

                self.session.flush()

            entity_dict['hashtag'] = hashtag

            entity_dict['hashtag_id'] = hashtag.id

            entity = EntityHashtag(**entity_dict)

            return entity

        def process_user_mentions():

            user_mention = self.__get_user(ind)

            if user_mention is None:

                entity_dict['user'] = None

                entity_dict['user_id'] = None

            else:

                entity_dict['user'] = user_mention

                entity_dict['user_id'] = user_mention.id

            entity = EntityUser(**entity_dict)

            return entity

        def process_urls():

            url = self.session.query(Url).filter(Url.url == ind["url"]).first()

            if url is None:

                url = Url(**ind)

                self.session.add(url)

                self.session.flush()

            entity_dict['url'] = url

            entity_dict['url_id'] = url.id

            entity = EntityUrl(**entity_dict)

            return entity

        #{'': lambda }

        entity =  { 

            'hashtags': process_hashtags,

            'user_mentions' : process_user_mentions,

            'urls' : process_urls

            }[ind_type]()

        if entity:

            self.session.add(entity)

            self.session.flush()

    def __process_twitter_stream(self):

        tweet_nb = self.session.query(Tweet).filter(Tweet.id == self.json_dict["id"]).count()

        if tweet_nb > 0:

            return

        ts_copy = adapt_fields(self.json_dict, fields_adapter["stream"]["tweet"])

        # get or create user

        user = self.__get_user(self.json_dict["user"])

        if user is None:

            ts_copy["user"] = None

            ts_copy["user_id"] = None

        else:

            ts_copy["user"] = user

            ts_copy["user_id"] = ts_copy["user"].id

        ts_copy["tweet_source_id"] = self.source_id

        self.tweet = Tweet(**ts_copy)

        self.session.add(self.tweet)

        self.session.flush()

        # get entities

        for ind_type, entity_list in self.json_dict["entities"].items():

            for ind in entity_list:

                self.__process_entity(ind, ind_type)

    def __process_twitter_rest(self):

        tweet_nb = self.session.query(Tweet).filter(Tweet.id == self.json_dict["id"]).count()

        if tweet_nb > 0:

            return

        tweet_fields = {

            'created_at': self.json_dict["created_at"], 

            'favorited': False,

            'id': self.json_dict["id"],

            'id_str': self.json_dict["id_str"],

            #'in_reply_to_screen_name': ts["to_user"], 

            'in_reply_to_user_id': self.json_dict["to_user_id"],

            'in_reply_to_user_id_str': self.json_dict["to_user_id_str"],

            #'place': ts["place"],

            'source': self.json_dict["source"],

            'text': self.json_dict["text"],

            'truncated': False,            

            'tweet_source_id' : self.source_id,

        }

        #user

        user_fields = {

            'lang' : self.json_dict.get('iso_language_code',None),

            'profile_image_url' : self.json_dict["profile_image_url"],

            'screen_name' : self.json_dict["from_user"],                   

        }

        user = self.__get_user(user_fields)

        if user is None:

            tweet_fields["user"] = None

            tweet_fields["user_id"] = None

        else:

            tweet_fields["user"] = user

            tweet_fields["user_id"] = user.id

        tweet_fields = adapt_fields(tweet_fields, fields_adapter["rest"]["tweet"])

        self.tweet = Tweet(**tweet_fields)

        self.session.add(self.tweet)

        text = self.tweet.text

        extractor = twitter_text.Extractor(text)

        for ind in extractor.extract_hashtags_with_indices():

            self.__process_entity(ind, "hashtags")

        for ind in extractor.extract_urls_with_indices():

            self.__process_entity(ind, "urls")

    def process(self):

        if self.source_id is None:

            tweet_source = TweetSource(original_json=self.json_txt);

            self.session.add(tweet_source)

            self.session.flush()

            self.source_id = tweet_source.id

    if options.logfile == "stdout":

        logging_config["stream"] = sys.stdout

    elif options.logfile == "stderr":

        logging_config["stream"] = sys.stderr

    else:

        logging_config["filename"] = options.logfile