#!/usr/bin/env python
# -*- coding: utf-8 -*-

import getpass
import os
import sys
import psycopg2
from psycopg2 import sql
from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT

def get_config():

    # Load configuration from config file
    config_filepath = "config/db_config.txt"
    mastodon_db = get_parameter("mastodon_db", config_filepath)
    mastodon_db_user = get_parameter("mastodon_db_user", config_filepath)
    mailing_db = get_parameter("mailing_db", config_filepath)
    mailing_db_user = get_parameter("mailing_db_user", config_filepath)
    mailing_db_table = get_parameter("mailing_db_table", config_filepath)
    inactive_days = get_parameter("inactive_days", config_filepath)

    return (mastodon_db, mastodon_db_user, mailing_db, mailing_db_user, mailing_db_table)

def get_parameter( parameter, file_path ):
    # Check if secrets file exists
    if not os.path.isfile(file_path):
        print("File %s not found, asking."%file_path)
        write_parameter( parameter, 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)

def write_parameter( parameter, file_path ):

    if not os.path.exists('config'):
        os.makedirs('config')

    print("Setting up mailing DB parameters...")
    print("\n")
    mastodon_db = input("Mastodon db name: ")
    mastodon_db_user = input("Mastodon db user: ")
    mailing_db = input("Mailing db name: ")
    mailing_db_user = input("Mailing db user: ")
    mailing_db_table = input("Mailing db table: ")
    inactive_days = input("Inactive days: ")

    with open(file_path, "w") as text_file:
        print("mastodon_db: {}".format(mastodon_db), file=text_file)
        print("mastodon_db_user: {}".format(mastodon_db_user), file=text_file)
        print("mailing_db: {}".format(mailing_db), file=text_file)
        print("mailing_db_user: {}".format(mailing_db_user), file=text_file)
        print("mailing_db_table: {}".format(mailing_db_table), file=text_file)
        print("inactive_days: {}".format(inactive_days), file=text_file)

def create_database():

    try:

      conn = psycopg2.connect(dbname='postgres',
          user=mailing_db_user, host='',
          password='')

      conn.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)

      cur = conn.cursor()

      print("Creating database " + mailing_db + ". Please wait...")
      cur.execute(sql.SQL("CREATE DATABASE {}").format(
              sql.Identifier(mailing_db))
          )
      print("Database " + mailing_db + " created!")

    except (Exception, psycopg2.DatabaseError) as error:

      print(error)

    finally:

      if conn is not None:

        conn.close()

    try:

      conn = None

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

    except (Exception, psycopg2.DatabaseError) as error:

      print(error)
      # Load configuration from config file
      os.remove("config/db_config.txt")
      print("Exiting. Run setup again with right parameters")
      sys.exit(0)

    if conn is not None:

      print("\n")
      print("Mailing db parameters saved to config.txt!")
      print("\n")

def create_table(db, db_user, table, sql):

  try:

    conn = None

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

    cur = conn.cursor()

    print("Creating table.. "+table)
    # Create the table in PostgreSQL database
    cur.execute(sql)

    conn.commit()
    print("Table "+table+" created!")
    print("\n")

  except (Exception, psycopg2.DatabaseError) as error:

    print(error)

  finally:

    if conn is not None:

      conn.close()

# main

if __name__ == '__main__':

    mastodon_db, mastodon_db_user, mailing_db, mailing_db_user, mailing_db_table = get_config()

    create_database()

    ########################################
    # create mailing DB table

    db = mailing_db
    db_user = mailing_db_user
    table = mailing_db_table
    sql = "create table " + table + "(datetime timestamptz, account_id bigint primary key, username varchar(30), email varchar(60), emailed_at timestamptz,"
    sql += "emailed boolean default False, deleted boolean default False, elapsed_days varchar(30), to_be_deleted boolean default False,"
    sql += "recipient_error boolean default False, feedback boolean default False, current_sign_in_at timestamptz)"
    create_table(db, db_user, table, sql)

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

    print("Done!\nNow you can run setup.py!\n")