import openai
import csv
import regex as re
from twitterscraper import TwitterScraper
from datetime import date
import os
from dotenv import find_dotenv, load_dotenv
import pandas as pd

# Set one directory up into ROOT_PATH
ROOT_PATH = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

dotenv_path = find_dotenv()
load_dotenv(dotenv_path)
OPENAI_AUTHTOKEN = os.environ.get("OPENAI_AUTHTOKEN")


class TextClassifier:
    def __init__(self, model_name="text-davinci-002", from_date='2022-01-01', to_date=str(date.today()),

                 user_name='jimmieakesson',
                 num_tweets=20, ):
        """
        Initializes the TextClassifier.
        :param model_name: name of the model from openai.
        :param from_date: string of the format 'YYYY-MM-DD'.
        :param to_date: string of the format 'YYYY-MM-DD'.
        :param num_tweets: integer value of the maximum number of tweets to be scraped.
        """
        # Make sure to_date is later than from_date
        assert from_date < to_date, "from_date must be earlier than to_date"
        # Make sure the dates are in the correct format
        assert re.match(r'^\d{4}-\d{2}-\d{2}$', from_date) is not None, "from_date must be in the format YYYY-MM-DD"
        # Make sure user_name is not empty
        assert user_name is not None, "user_name cannot be empty"
        # Make sure num_tweets is a positive integer
        assert num_tweets > 0, "num_tweets must be a positive integer"

        self.model_name = model_name
        self.from_date = from_date
        self.to_date = to_date
        self.num_tweets = num_tweets
        self.user_name = user_name
        self.ts = TwitterScraper.TwitterScraper(from_date, to_date, num_tweets)
        self.df = self.ts.scrape_by_user(user_name)
        # self.api_key = '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'
        openai.api_key = OPENAI_AUTHTOKEN

    def classify_topic_and_sentiment(self):
        self.classify_topic_of_tweets()
        self.classify_sentiment_of_tweets()

        # save the dataframe to a csv file

    @staticmethod
    def cleanup_sentiment_results(classification_unclean):
        """
        Cleans up the results of the sentiment classification.
        :param classification_unclean: string of the classification result.
        :return: cleaned up string.
        """
        classification_clean = classification_unclean.replace('\n\n', "")
        classification_clean = classification_clean.replace('\n', "")
        if classification_clean.startswith(" "):
            classification_clean = classification_clean.replace(" ", "")

        return classification_clean

    def classify_sentiment(self, text: str):
        """
        Classifies the sentiment of a text.
        """
        assert isinstance(text, str)

        prompt_string = "Classify one sentiment for this tweet:\n \""
        prompt_string += text
        prompt_string += "\" \nFor example:\nSupport,\nOpposition,\nCriticism,\nPraise,\nDisagreement," \
                         "\nAgreement,\nSkepticism,\nAdmiration,\nAnecdotes,\nJokes,\nMemes,\nSarcasm,\nSatire," \
                         "\nQuestions,\nStatements,\nOpinions,\nPredictions.\nSENTIMENT="

        response = openai.Completion.create(
            model=self.model_name,
            prompt=prompt_string,
            temperature=0.0,
            max_tokens=256,
            top_p=1,
            frequency_penalty=0,
            presence_penalty=0,
            logprobs=5
        )
        classification_unclean = response.choices[0]['text']
        classification_clean = self.cleanup_sentiment_results(classification_unclean)

        return classification_clean.lower()

    def classify_sentiment_of_tweets(self):
        """
        Classifies the sentiment of a user's tweets.
        """
        df_sentiment = self.df.copy()

        df_sentiment['sentiment'] = df_sentiment['tweet'].apply(self.classify_sentiment)
        self.df = df_sentiment
        return self.df

    def analyze_sentiment(self, text: str, sentiment: str):
        # TODO: fix prompt before running this method
        """
        Analyzes the sentiment of a text using OpenAI.
        :param text: string of the tweet text.
        :param sentiment:
        :return:
        """
        # assert 1 == 2, "Måste fixa prompt innan denna metod körs"
        prompt_string = "Who is the TARGET of this "
        prompt_string += sentiment
        prompt_string += " TWEET?\\nTWEET=\""
        prompt_string += text
        prompt_string += "\"\\n.TARGET should consist of less than 5 words.\\nTARGET="

        response = openai.Completion.create(
            model=self.model_name,
            prompt=prompt_string,
            temperature=0,
            max_tokens=256,
            top_p=1,
            frequency_penalty=0,
            presence_penalty=0
        )

        analyzed_sentiment = response.choices[0]['text']
        # Remove spaces at the start/end of the response
        if analyzed_sentiment.startswith(' '):
            analyzed_sentiment = analyzed_sentiment[1:]
        if analyzed_sentiment.endswith(' '):
            analyzed_sentiment = analyzed_sentiment[:-1]

        # Sometimes GPT-3 gives faulty results, so a simple filter is introduced
        # If the prediction is bad
        # -> set target value to N/A (not applicable)
        if len(analyzed_sentiment) > 50:
            analyzed_sentiment = "N/A"

        # An attempt to merge target responses that should be the same
        analyzed_sentiment = re.sub("\(", "", analyzed_sentiment)
        analyzed_sentiment = re.sub("\)", "", analyzed_sentiment)

        s_list = ["s", "the swedish social democratic party"]
        m_list = ["m", "the swedish moderate party", "the moderate party"]
        mp_list = ["mp", "the swedish green party"]

        if analyzed_sentiment.lower() == "v":
            analyzed_sentiment = "Vänsterpartiet"
        elif analyzed_sentiment.lower() == "mp":
            analyzed_sentiment = "Miljöpartiet"
        elif analyzed_sentiment.lower() in s_list:
            analyzed_sentiment = "Socialdemokraterna"
        elif analyzed_sentiment.lower() == "c":
            analyzed_sentiment = "Centerpartiet"
        elif analyzed_sentiment.lower() == "l":
            analyzed_sentiment = "Liberalerna"
        elif analyzed_sentiment.lower() == "kd":
            analyzed_sentiment = "Kristdemokraterna"
        elif analyzed_sentiment.lower() in m_list:
            analyzed_sentiment = "Moderaterna"
        elif analyzed_sentiment.lower() == "sd":
            analyzed_sentiment = "Sverigedemokraterna"
        elif analyzed_sentiment.lower() == "the swedish government":
            analyzed_sentiment = "Regeringen"

        return analyzed_sentiment

    def analyze_sentiment_of_tweets(self):
        """
        Analyzes the sentiment of a user's tweets.
        """
        # check if 'sentiment' column exists, raise exception if not
        assert 'sentiment' in self.df.columns, \
            "'sentiment' column does not exist. Please run classify_sentiment_of_tweets first."

        df_sentiment = self.df.copy()
        df_sentiment['target'] = df_sentiment.apply(lambda row: self.analyze_sentiment(row['tweet'], row['sentiment']),
                                                    axis=1)
        self.df = df_sentiment
        return self.df

    def classify_topic(self, text: str):
        """
        Classifies the topics of a text.
        :param text: string of the tweet text.
        """
        assert isinstance(text, str)

        prompt_string = "Classify one topic for this tweet:\n \""
        prompt_string += text
        prompt_string += "\" \nFor example:\nEconomy,\nEnvironment,\nHealth,\nPolitics,\nScience,\nSports,\nTechnology," \
                         "\nTransportation,\nWorld.\nTOPIC="

        response = openai.Completion.create(
            model=self.model_name,
            prompt=prompt_string,
            temperature=0,
            max_tokens=892,
            top_p=1,
            frequency_penalty=0,
            presence_penalty=0,
        )
        classification_unclean = response.choices[0]['text']
        classification_clean = self.cleanup_topic_results(classification_unclean)

        return classification_clean.lower()

    def classify_topics_of_tweets(self):
        """
        Classifies the topics of a user's tweets.
        """
        df_topic = self.df
        df_topic['topic'] = df_topic['tweet'].apply(self.classify_topic)
        return df_topic

    @staticmethod
    def cleanup_topic_results(text):
        new_item = text.replace("\n", " ")
        new_item = new_item.replace("  ", " ")
        return new_item

    def df_to_csv(self, filename="{}/data/twitterdata.csv".format(ROOT_PATH)):
        """
        Writes pandas df to csv file. If it already exists, it appends. If not, it creates. It also removes duplicates.
        :param filename:
        :return:
        """
        if not os.path.exists(filename):
            self.df.to_csv(filename, index=False)
        else:
            self.df.to_csv(filename, mode='a', header=False, index=False)

        self.remove_duplicates_from_csv(filename)

    @staticmethod
    def remove_duplicates_from_csv(filename="{}/data/twitterdata.csv".format(ROOT_PATH)):
        """
        Removes duplicates from csv file.
        :param filename: filename of csv file
        :return: None
        """
        with open(filename, 'r') as f:
            lines = f.readlines()
        with open(filename, 'w') as f:
            for line in lines:
                if line not in lines[lines.index(line) + 1:]:
                    f.write(line)

    def remove_already_classified_tweets(self, filename="{}/data/twitterdata.csv".format(ROOT_PATH)):
        """
        Removes tweets that have already been classified.
        :param filename: filename of csv file
        :return: None
        """
        df = self.df
        df = df[df['sentiment'].isnull()]
        self.df = df
        self.df_to_csv(filename)

    def get_tweet_by_id(self, id, filename="{}/data/twitterdata.csv".format(ROOT_PATH)):
        """
        Returns tweet by id.
        :param id: id of tweet
        :return: tweet
        """

    def run_main_pipeline(self, filename="{}/data/twitterdata.csv".format(ROOT_PATH)):
        """
        Classifies the topics/sentiments of a user's tweets.
        #We presume that all tweets inside the twitterdata.csv file are already classified.
        :return: Pandas dataframe
        """
        # temp_df = pd.DataFrame(
        #     columns=['id', 'tweet', 'date', 'user_id', 'username', 'urls', 'nlikes', 'nreplies', 'nretweets'])
        if os.path.exists(filename):
            already_classified_df = pd.read_csv(filename)
            # Remove all entries in self.df that are already in already_classified_df
            self.df = self.df.merge(already_classified_df, how='left', on='id')
            # Create a new dataframe where entries in already_classified_df but not in self.df
            temp_df = already_classified_df.merge(self.df, how='left', on='id')
        else:
            print("No csv file found. Continuing without removing already classified tweets.")

        self.df = self.classify_topics_of_tweets()
        self.df = self.classify_sentiment_of_tweets()
        # self.df = self.analyze_sentiment_of_tweets()

        self.df_to_csv(filename)

    def __repr__(self):
        """
        Gives a string that describes which user is classified
        :return:
        """
        return "Classifier for user: " + self.user_name + " with model: " + self.model_name + "."


if __name__ == "__main__":
    tc = TextClassifier(from_date="2019-12-01", to_date="2020-12-31", user_name='jimmieakesson', num_tweets=100)
    tc.run_main_pipeline()