import setuptools
import sqlite3, pymysql, pymysql.cursors

SQLITE = 0
MYSQL = 1
MARIADB = MYSQL

MIN = 0
MAX = 1

class dbObject:

# --------------------------------------------- Initialization -------------------------------------------------

 def initMySQL(self, host, port, user, pwd, db):
  self.conn = pymysql.connect(host = host, port = port, user = user, password = pwd, db = db, charset = "utf8mb4", cursorclass = pymysql.cursors.DictCursor)
  self.cur = self.conn.cursor()
  self.dbtype = MYSQL
  self.host = host
  self.port = port
  self.user = user
  self.pwd = pwd
  self.db = db

 def initSQLite(self, path):
  self.conn = sqlite3.connect(path)
  self.cur = self.conn.cursor()
  self.dbtype = SQLITE
  self.path = path

 def __init__(self, dbtype = SQLITE, path = None, host = None, port = None, user = None, pwd = None, db = None):

  if dbtype == SQLITE:
   self.initSQLite(path or 'Database.db')

  elif dbtype == MYSQL:
   self.initMySQL(host or 'localhost', port or 3306, user, pwd, db)

  else:
   raise ValueError("Unknown database type %s." % str(dbtype))

# ---------------------------------------------- No more initialization ----------------------------------------

 def closeConnection(self):
  return self.conn.close()

 def commit(self):
  return self.conn.commit()

 def executeQuery(self, query):
  return self.cur.execute(query)

 def getAll(self):
  return self.cur.fetchall()

 def getNext(self):
  return self.cur.fetchone()

 def isInitialized(self):
  try:
   self.executeQuery("SELECT * FROM tweets")
   return True
  except:
   return False

 def getFLDate(self, val = MIN):
  if val == MIN:
   mode = "MIN"
  else:
   mode = "MAX"
  if self.dbtype == SQLITE:
   return setuptools.getDate(str(list(self.executeQuery("SELECT %s(SUBSTR(timestamp,0,11)) FROM tweets" % mode))[0][0]))
  else:
   self.executeQuery("SELECT %s(SUBSTR(timestamp,0,11)) FROM tweets" % mode)
   return setuptools.getDate(str(self.getNext()["%s(SUBSTR(timestamp,0,11))" % mode]))

 def getFollowers(db):
  db.executeQuery("SELECT id FROM followers WHERE `until` IS NULL;")
  for i in db.getAll():
   yield i[0]

 def getFollowing(db):
  db.executeQuery("SELECT id FROM following WHERE `until` IS NULL;")
  for i in db.getAll():
   yield i[0]  


 def getLatestMessage(db):
  db.executeQuery("SELECT max(id) FROM messages")
  try:
   return int(db.getNext()[0])
  except:
   return 0

 def getLatestTweet(db):
  db.executeQuery("SELECT max(tweet_id) FROM tweets")
  try:
   return int(db.getNext()[0])
  except:
   return 0

def dbHelper():
 if setuptools.dbtype() == SQLITE:
  return dbObject(dbtype=SQLITE, path=setuptools.dbpath())
 elif setuptools.dbtype() == MYSQL:
  return dbObject(dbtype=MYSQL, host=setuptools.dbhost(), user=setuptools.dbuser(), pwd=setuptools.dbpass(), db=setuptools.dbname())
 else:
  raise setuptools.SetupException()