import mysql.connector
import configparser

config = configparser.ConfigParser()

try:
    config.read(".config")
except Exception as E:
    print(E)

def dbConnect():
    mydb = mysql.connector.connect(
    host=config["mysql"]["Host"],
    user=config["mysql"]["Username"],
    passwd=config["mysql"]["Password"],
    database=config["mysql"]["Database"]
    )
    return mydb


def doesTableExist():
    mydb = dbConnect()
    mycursor = mydb.cursor()
    mycursor.execute('''SHOW TABLES''')
    tables = mycursor.fetchall()
    if len(tables) == 0:
        mycursor.execute('''CREATE TABLE USERS (id INT AUTO_INCREMENT PRIMARY KEY, username VARCHAR(255), password VARCHAR(255), admin BOOLEAN)''')
        mycursor.execute('''CREATE TABLE LISTS (id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(255))''')
        mycursor.execute('''CREATE TABLE SHOPLIST (id INT AUTO_INCREMENT PRIMARY KEY, item VARCHAR(255), gotten BOOLEAN, user_id INT, list_id INT, FOREIGN KEY (`list_id`) REFERENCES `LISTS`(`id`), FOREIGN KEY (`user_id`) REFERENCES `USERS`(`id`)
                      ON DELETE CASCADE)''')
        mycursor.execute('''CREATE TABLE USER_META (user_id INT, list_id INT, FOREIGN KEY (`list_id`) REFERENCES `LISTS`(`id`), FOREIGN KEY (`user_id`) REFERENCES `USERS`(`id`)
                      ON DELETE CASCADE)''')
    mydb.close()

def runQuery(query, data=None):
    mydb = dbConnect()
    c = mydb.cursor()
    if data is not None:
        c.execute(query, data)
    else:
        c.execute(query)
    if query.lower().startswith("select"):
        ret = c.fetchall()
    else:
        ret = []
    mydb.commit()
    mydb.close()
    return ret

def readFromDB():
    # By default load all shopping lists the user is a part of (Most users will only have one so this this fine)
    query = '''select SHOPLIST.id, SHOPLIST.item, SHOPLIST.gotten, USERS.username, SHOPLIST.list_id from SHOPLIST inner join USERS on SHOPLIST.user_id = USERS.id inner join USER_META on SHOPLIST.list_id = USER_META.list_id'''
    return runQuery(query)

def insertToDB(data):
    query = "INSERT INTO SHOPLIST (item, gotten, user_id, list_id) VALUES (%s, 0, %s, %s)"
    data = (data['item'], data['name'], data["list_id"])
    # print(query)
    runQuery(query, data)


def deleteRow(rowID):
    query = "DELETE FROM SHOPLIST WHERE id = %s"
    data = (rowID, )
    runQuery(query, data)

def getItem(rowID):
    query = "UPDATE SHOPLIST set gotten = 1 where id = %s"
    data = (rowID, )
    runQuery(query, data)

def unGetItem(rowID):
    query = "UPDATE SHOPLIST set gotten = 0 where id = %s"
    data = (rowID, )
    runQuery(query, data)

def get_users(username=None):
    if username == None:
        #return all users
        query = "select username, admin, id from USERS"
        return runQuery(query)
    query = "select username, admin from USERS where username like %s"
    data = (username, )
    return runQuery(query, data)

def add_user(userData):
    username = userData["username"]
    password = userData["password"]
    query = "insert into USERS (username, password, admin) values (%s, md5(%s), False)"
    data = (username, password)
    runQuery(query, data)

def update_pass(user_id, newpass):
    query = "update USERS set password=md5(%s) where id=%s"
    data = (newpass, user_id)
    runQuery(query, data)

def get_items(user_id, list_id=None):
    if list_id != None:
        query = "select SHOPLIST.id, SHOPLIST.item, SHOPLIST.gotten, USERS.username from SHOPLIST inner join USERS on SHOPLIST.user_id = USERS.id inner join USER_META on SHOPLIST.list_id = USER_META.list_id where USER_META.user_id = %s and SHOPLIST.list_id = %s"
        data = (user_id, list_id)
        return runQuery(query, data)
    query = "select SHOPLIST.id, SHOPLIST.item, SHOPLIST.gotten, USERS.username from SHOPLIST inner join USERS on SHOPLIST.user_id = USERS.id inner join USER_META on SHOPLIST.list_id = USER_META.list_id where USER_META.user_id = %s"
    data = (user_id,)
    return runQuery(query, data)

def get_list_ids(user_id):
    ret = {}
    if user_id == "admin":
        query = "SELECT id, name from LISTS;"
        res = runQuery(query)
    else:
        query = "select USER_META.list_id, LISTS.name from USER_META inner join LISTS on LISTS.id = USER_META.list_id where USER_META.user_id = %s"
        data = (user_id,)
        res = runQuery(query, data)
    for lid, name in res:
        ret[str(lid)] = name
    return ret

def addList(list_name):
    query = "insert into LISTS (name) values (%s)"
    data = (list_name,)
    runQuery(query, data)

def addUserToList(userid, listid):
    query = "insert into USER_META (user_id, list_id) values (%s, %s)"
    data = (userid, listid)
    runQuery(query, data)

def doLogin(username, password):
    query = "select id, username, admin from USERS where username = %s and password = md5(%s)"
    data = (username, password)
    return runQuery(query, data)