import os, sys, sqlite3

def create_database():
      # Existenz feststellen
      if os.path.exists("party.db"):
            print("Datei bereits vorhanden")
            sys.exit(0)

      # Verbindung zur Datenbank erzeugen
      connection = sqlite3.connect("party.db")
      cursor = connection.cursor()

      sql = "CREATE TABLE user(" \
            "userID INTEGER UNIQUE PRIMARY KEY, " \
            "username TEXT, " \
            "sessionID INTEGER, " \
            "info TEXT);"
      cursor.execute(sql)

      sql = "CREATE TABLE session(" \
            "sessionID INTEGER UNIQUE PRIMARY KEY, " \
            "sessionname TEXT);"
      cursor.execute(sql)

      sql = "CREATE TABLE chat(" \
            "sessionID TEXT " \
            "userid TEXT " \
            "chatmessage TEXT, " \
            "Zeit TEXT);"
      cursor.execute(sql)

      sql = "CREATE TABLE game(" \
            "sessionID TEXT " \
            "userID TEXT " \
            "Spielname TEXT, " \
            "Zeit TEXT);"
      cursor.execute(sql)

      sql = "CREATE TABLE planer(" \
            "event TEXT " \
            "zeit TEXT " \
            "sessionID TEXT);"
      cursor.execute(sql)


      connection.close()