import os
import feedparser
import re
from mastodon import Mastodon
import psycopg2
import sys
import time
import tweepy
from tweepy import TweepError
import logging
import pdb

logger = logging.getLogger()

def cleanhtml(raw_html):
    
    cleanr = re.compile('<.*?>')
    cleantext = re.sub(cleanr, '', raw_html)
    return cleantext

def unescape(s):
    
    s = s.replace("&apos;", "'")
    s = s.replace('&quot;', '"')
    return s

def create_api():
    
    auth = tweepy.OAuthHandler(api_key, api_key_secret)
    auth.set_access_token(access_token, access_token_secret)
    api = tweepy.API(auth, wait_on_rate_limit=True, 
        wait_on_rate_limit_notify=True)
    try:
        api.verify_credentials()
    except Exception as e:
        logger.error("Error creating API", exc_info=True)
        raise e
    logger.info("API created")
    return api

def mastodon():

    # Load secrets from secrets file
    secrets_filepath = "secrets/secrets.txt"
    uc_client_id = get_parameter("uc_client_id",     secrets_filepath)
    uc_client_secret = get_parameter("uc_client_secret", secrets_filepath)
    uc_access_token = get_parameter("uc_access_token",  secrets_filepath)

    # Load configuration from config file
    config_filepath = "config/config.txt"
    mastodon_hostname = get_parameter("mastodon_hostname", config_filepath)

    # Initialise Mastodon API
    mastodon = Mastodon(
        client_id=uc_client_id,
        client_secret=uc_client_secret,
        access_token=uc_access_token,
        api_base_url='https://' + mastodon_hostname,
    )

    # Initialise access headers
    headers = {'Authorization': 'Bearer %s'%uc_access_token}

    return (mastodon, mastodon_hostname)

def db_config():

    # Load db configuration from config file
    db_config_filepath = "config/db_config.txt"
    feeds_db =  get_parameter("feeds_db", db_config_filepath)
    feeds_db_user =  get_parameter("feeds_db_user", db_config_filepath)
    feeds_url =  get_parameter("feeds_url", db_config_filepath)
    
    return (feeds_db, feeds_db_user, feeds_url)

def twitter_config():
    
    twitter_config_filepath = "config/keys_config.txt"
    api_key = get_parameter("api_key", twitter_config_filepath)
    api_key_secret = get_parameter("api_key_secret", twitter_config_filepath)
    access_token = get_parameter("access_token", twitter_config_filepath)
    access_token_secret = get_parameter("access_token_secret", twitter_config_filepath)

    return(api_key, api_key_secret, access_token, access_token_secret)

# Returns the parameter from the specified file
def get_parameter( parameter, file_path ):
    # Check if secrets file exists
    if not os.path.isfile(file_path):
        print("File %s not found, exiting."%file_path)
        sys.exit(0)

    # Find parameter in file
    with open( file_path ) as f:
        for line in f:
            if line.startswith( parameter ):
                return line.replace(parameter + ":", "").strip()

    # Cannot find parameter, exit
    print(file_path + "  Missing parameter %s "%parameter)
    sys.exit(0)

###############################################################################
# main

if __name__ == '__main__':

    #######################################################################
    #mastodon, mastodon_hostname = mastodon()
    
    feeds_db, feeds_db_user, feeds_url = db_config()

    api_key, api_key_secret, access_token, access_token_secret = twitter_config()

    api = create_api()
    
    publish = 0

    try:

        newsfeeds = feedparser.parse(feeds_url)

    except:

        print(newsfeeds.status)
        sys.exit(0)

    for entry in newsfeeds.entries:

        title = entry['summary']
        id = entry['id']
        link = entry['link']

        ###################################################################
        # check database if feed is already published

        try:

            conn = None
            conn = psycopg2.connect(database = feeds_db, user = feeds_db_user, password = "", host = "/var/run/postgresql", port = "5432")

            cur = conn.cursor()

            cur.execute('select link from feeds where link=(%s)', (link,))

            row = cur.fetchone()
            if row == None:
                publish = 1
            else:
                publish = 0

            cur.close()

        except (Exception, psycopg2.DatabaseError) as error:

            print(error)

        finally:

            if conn is not None:

                conn.close()

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

        if publish == 1:

            toot_text = str(title)+'\n'
            toot_text += str(link)

            toot_text = cleanhtml(toot_text)
            toot_text = unescape(toot_text)
            
            print("Tooting...")
            print(toot_text)
            
            if len(toot_text) < 280:
                
                try:
                    
                    api.update_status(toot_text)
                
                except TweepError as err:
                    
                    print('\n')
                    sys.exit(err)
            
            else:
      
                toot_text1 = toot_text[:int(len(toot_text)/2)].rsplit(' ', 1)[0]
                toot_text2 = toot_text[int(len(toot_text1)):]

                try:
                    
                    first_tweet = api.update_status(toot_text1)
                    api.update_status(toot_text2, in_reply_to_status_id=first_tweet.id)
                
                except TweepError as err:
                    
                    print('\n')
                    sys.exit(err)

            time.sleep(2)

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

            insert_line = 'INSERT INTO feeds(link) VALUES (%s)'

            conn = None

            try:

                conn = psycopg2.connect(database = feeds_db, user = feeds_db_user, password = "", host = "/var/run/postgresql", port = "5432")

                cur = conn.cursor()

                cur.execute(insert_line, (link,))

                conn.commit()

                cur.close()

            except (Exception, psycopg2.DatabaseError) as error:

                print(error)

            finally:

                if conn is not None:

                    conn.close()
        else:

            print("Any new feeds")
            sys.exit(0)