import getpass
import os
import sys
import psycopg2
from mastodon import Mastodon
from mastodon.Mastodon import MastodonMalformedEventError, MastodonNetworkError, MastodonReadTimeout, MastodonAPIError, MastodonIllegalArgumentError
import uuid
import pdb

def check_account(username):

    is_duplicate = False

    sql = 'select username from maccounts where username=(%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, (username,))

        row = cur.fetchone()

        if row != None:

            is_duplicate = True

    except (Exception, psycopg2.DatabaseError) as error:

        check_error = error.pgcode

        sys.stdout.write(f'\n{str(error)}\n')

    finally:

        if conn is not None:

            conn.close()

        return is_duplicate

def save_bot_account(hostname, username, client_id, client_secret, token, twitter_username):

    bot_uuid = str(uuid.uuid4())

    save_error = None

    mastodon_sql = f'INSERT INTO maccounts (bot_id, hostname, username, client_id, client_secret, client_token) VALUES (%s,%s,%s,%s,%s,%s)'

    twitter_sql = f'INSERT INTO taccounts (bot_id, username) 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(mastodon_sql, (bot_uuid, hostname, username, client_id, client_secret, token))

        cur.execute(twitter_sql, (bot_uuid, twitter_username))

        conn.commit()

    except (Exception, psycopg2.DatabaseError) as error:

        save_error = error.pgcode

        sys.stdout.write(f'\n{str(error)}\n')

    finally:

        if conn is not None:

            conn.close()

    return save_error

def get_config():

    # Load configuration from config file
    config_filepath = "config/db_config.txt"
    replicator_db = get_db_params("replicator_db", config_filepath)
    replicator_db_user = get_db_params("replicator_db_user", config_filepath)

    return (config_filepath, replicator_db, replicator_db_user)

def check_db_conn():

    try:

        conn = None

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

    except (Exception, psycopg2.DatabaseError) as error:

        sys.stdout.write(f'\n{str(error)}\n')

        sys.exit("Exiting. Run 'python db-setup' again")

def ask_account():

    print(f'Setting up Mastodon bot account...\n')
    hostname = input("Enter Mastodon hostname: ")
    user_name = input(f'User name, ex. user@{hostname}? ')
    user_password = getpass.getpass("User password? ")
    app_name = 'replicator'
    twitter_username = input(f'Twitter username (ex. jack)? ')
    
    return (hostname, user_name, user_password, app_name, twitter_username)

def log_in(hostname, user_name, user_password, app_name):

    token = ''

    try:

        response = Mastodon.create_app(
            app_name,
            scopes=["read","write"],
            to_file=None,
            api_base_url=hostname
            )
        client_id = response[0]
        client_secret = response[1]

        mastodon = Mastodon(client_id = client_id, client_secret = client_secret, api_base_url = hostname)
        
        token = mastodon.log_in(
            user_name,
            user_password,
            scopes = ["read", "write"],
            to_file = None
        )

    except MastodonIllegalArgumentError as i_error:

        sys.stdout.write(f'\n{str(i_error)}\n')

    except MastodonNetworkError as n_error:

        sys.stdout.write(f'\n{str(n_error)}\n')

    except MastodonReadTimeout as r_error:

        sys.stdout.write(f'\n{str(r_error)}\n')

    except MastodonAPIError as a_error:

        sys.stdout.write(f'\n{str(a_error)}\n')

    finally:

        return (client_id, client_secret, token)
   
def get_db_params( parameter, file_path ):

    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__':

    config_filepath, replicator_db, replicator_db_user = get_config()

    check_db_conn()

    hostname, user_name, user_password, app_name, twitter_username = ask_account()

    is_duplicate = check_account(user_name)

    if is_duplicate:

        print(f'Mastodon account already exist!')

        sys.exit()

    else:

        client_id, client_secret, token = log_in(hostname, user_name, user_password, app_name)

        if len(token) > 0:

            save_error = save_bot_account(hostname, user_name, client_id, client_secret, token, twitter_username)

            if save_error == None:

                print(f'Done.')

            else:

                if save_error == '423505':

                    sys.exit()