import pandas as pd
import os


class User:
    def __init__(self, username, token, num_interests=3, directory='./', interests_file='interests.json'):
        self.username = username
        self.token = token
        self.num_interests = num_interests
        self.interests_file = directory + username+'_'+interests_file
        self.interests = pd.read_json(self.interests_file) if os.path.isfile(self.interests_file) else pd.DataFrame(columns=['interest', 'frequency'])  # {'interest': 'frequency':}

    def initialize(self):
        if self.interests.empty:
            self.interests = pd.DataFrame(columns=['interest', 'frequency'])

    def update_interests(self, topics):
        for topic in topics:
            index = self.interests.index[self.interests['interest'] == topic]
            if len(index) > 0:
                self.interests.at[index[0], 'frequency'] += 1
            else:
                self.interests = self.interests.append({'interest': topic, 'frequency': max(
                    self.interests['frequency']) if not self.interests.empty else 6}, ignore_index=True)

        self.interests = self.interests.sort_values(by='frequency', ascending=False, ignore_index=True)
        self.interests.to_json(self.interests_file)

    def decay_interests(self):
        for i, interest in self.interests.iterrows():
            if interest['frequency'] > 1:
                self.interests.at[i, 'frequency'] -= 1

    def get_user_interests(self):
        current_interests = []
        for i, row in self.interests.iterrows():
            if i < self.num_interests:
                current_interests.append(row['interest'])
        return current_interests