import os
from mastodon import Mastodon
import psycopg2
import sys
import time
import requests
import shutil
import tweepy
from tweepy.errors import (
    BadRequest, Forbidden, HTTPException, TooManyRequests, TwitterServerError,
    Unauthorized
)
from tweepy import TweepyException
import logging
import pdb

logger = logging.getLogger()

def load_bots():

    bot_id_lst = []

    hostname_lst = []

    username_lst = []

    client_id_lst = []

    client_secret_lst = []

    client_token_lst = []

    sql = 'select bot_id, hostname, username, client_id, client_secret, client_token from maccounts'

    try:

        conn = None

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

        cur = conn.cursor()

        cur.execute(sql)

        rows = cur.fetchall()

        for row in rows:

            bot_id_lst.append(row[0])

            hostname_lst.append(row[1])

            username_lst.append(row[2])

            client_id_lst.append(row[3])

            client_secret_lst.append(row[4])

            client_token_lst.append(row[5])

        cur.close()

        return(bot_id_lst, hostname_lst, username_lst, client_id_lst, client_secret_lst, client_token_lst)

    except (Exception, psycopg2.DatabaseError) as error:

        print(error)

    finally:

        if conn is not None:

            conn.close()

def get_tusername(bot_id):

    t_username = ''

    sql = 'select username from taccounts where bot_id=(%s)'

    try:

        conn = None

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

        cur = conn.cursor()

        cur.execute(sql, (bot_id,))

        row = cur.fetchone()

        if row != 0:

            t_username = row[0]

        cur.close()

        return(t_username)

    except (Exception, psycopg2.DatabaseError) as error:

        print(error)

    finally:

        if conn is not None:

            conn.close()


def parse_url(toot_text):

    sub_str = 'http'
    find_link = toot_text.find(sub_str)
    if find_link != -1:

        tuit_text = toot_text[:toot_text.index(sub_str)]

    else:

        tuit_text = toot_text

    return tuit_text

def get_toot_id(tweet_id):

    toot_id = 0

    try:

        conn = None

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

        cur = conn.cursor()

        cur.execute('select toot_id, tweet_id from id where tweet_id=(%s)', (tweet_id,))

        row = cur.fetchone()

        if row != None:

            toot_id = row[0]

        cur.close()

        return(toot_id)

    except (Exception, psycopg2.DatabaseError) as error:

        print(error)

    finally:

        if conn is not None:

            conn.close()

def write_db(toot_id, tweet_id):

    sql_insert_ids = 'INSERT INTO id(toot_id, tweet_id) VALUES (%s,%s)'

    conn = None

    try:

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

        cur = conn.cursor()

        cur.execute(sql_insert_ids, (toot_id, tweet_id))

        conn.commit()

        cur.close()

    except (Exception, psycopg2.DatabaseError) as error:

        print(error)

    finally:

        if conn is not None:

            conn.close()

def write_image(image_url):

    if not os.path.exists('images'):
        os.makedirs('images')
    filename = image_url.split("/") [-1]
    r = requests.get(image_url, stream = True)
    r.raw.decode_content = True
    with open('images/' + filename, 'wb') as f:
        shutil.copyfileobj(r.raw, f)

    return filename

def oauth2():

    auth = tweepy.OAuthHandler(api_key, api_key_secret)

    try:

        apiv1 = tweepy.API(auth)
        logged_in = True

        print(f'\nTwitter API: authentication succesfull!\n')

    except Exception as e:

        logger.error("Error creating API", exc_info=True)
        raise e

    logger.info("API created")

    return (apiv1, logged_in)

def mastodon_log_in(id, secret, token, hostname):

    # Initialise Mastodon API
    mastodon = Mastodon(
        client_id=id,
        client_secret=secret,
        access_token=token,
        api_base_url='https://' + hostname,
    )

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

    return (mastodon)

def db_config():

    # Load db configuration from config file
    db_config_filepath = "config/db_config.txt"
    replicator_db =  get_parameter("replicator_db", db_config_filepath)
    replicator_db_user =  get_parameter("replicator_db_user", db_config_filepath)
    
    return (replicator_db, replicator_db_user)

def twitter_config():

    sql = 'select api_key, api_key_secret from tsecrets'

    try:

        conn = None

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

        cur = conn.cursor()

        cur.execute(sql)

        row = cur.fetchone()

        if row != None:

            api_key = row[0]

            api_key_secret = row[1]

        cur.close()

        return(api_key, api_key_secret)

    except (Exception, psycopg2.DatabaseError) as error:

        print(error)

    finally:

        if conn is not None:

            conn.close()

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__':

    replicator_db, replicator_db_user = db_config()

    bot_id_lst, hostname_lst, username_lst, client_id_lst, client_secret_lst, client_token_lst = load_bots()

    logged_in = False

    api_key, api_key_secret = twitter_config()

    i = 0

    while i < len(bot_id_lst):

        mastodon = mastodon_log_in(client_id_lst[i], client_secret_lst[i], client_token_lst[i], hostname_lst[i])

        t_username = get_tusername(bot_id_lst[i])

        # check new tweets

        if not logged_in:

            apiv1, logged_in = oauth2()

        try:

            print(f'Checking {t_username} for new tweets')

            user_id = apiv1.get_user(screen_name=t_username).id

            user_tweets = apiv1.user_timeline(user_id=user_id, tweet_mode='extended')

        except tweepy.errors.Unauthorized as non_auth_error:

            sys.exit(f'\n{non_auth_error}\n\nCheck your Twitter API key & secret!')

        except tweepy.errors.TweepyException as tweepy_exception:

            sys.exit(f'\n{tweepy_exception}')

        for tweet in reversed(user_tweets):

            if not tweet.retweeted and tweet.entities['user_mentions'] == []:

                tweet_id = tweet.id

                toot_id = get_toot_id(tweet_id)

                if toot_id == 0:

                    print(f'tweet id: {tweet.id}, {tweet.full_text}')

                    is_reply = False

                    is_media = False

                    toot_text = tweet.full_text

                    if tweet.in_reply_to_status_id != None and tweet.in_reply_to_user_id == user_id:

                        tweet_reply_id = tweet.in_reply_to_status_id

                        reply_toot_id = get_toot_id(tweet_reply_id)

                        if reply_toot_id != 0:

                            is_reply = True

                        else:

                            reply_toot_id = None

                    else:

                        reply_toot_id = None

                    if 'media' in tweet.entities:

                        is_media = True

                        toot_text = toot_text.replace(tweet.entities['media'][0]['url'],'')

                        images_id_lst = []

                        media_qty = len(tweet.entities['media'])

                        i = 0
                        while i < media_qty:

                            media_url = tweet.entities['media'][0]['media_url']
                            image_filename = write_image(media_url)
                            image_id = mastodon.media_post('images/'+ image_filename, "image/png", description='twitter image').id
                            images_id_lst.append(image_id)

                            i += 1

                    if len(tweet.entities['urls']) > 0:

                        toot_text = parse_url(toot_text)

                        url = tweet.entities['urls'][0]['expanded_url']

                        toot_text = f'{toot_text}\n{url}' 

                    toot_id = mastodon.status_post(toot_text, in_reply_to_id=reply_toot_id, media_ids=images_id_lst if is_media else None).id

                    write_db(toot_id, tweet_id)

                    time.sleep(2)

        i += 1

    print('Done.')