from datetime import datetime
import hashlib
import sqlite3


def con3():
    conn = sqlite3.connect('db/db.sqlite')
    return conn


def create_user(name: str, email: str, password: str):
    password = hashlib.sha256(password.encode()).hexdigest()
    now = datetime.now().isoformat()
    query = (f"INSERT INTO users (name, email, password, created_at, updated_at) VALUES ('{name}', '{email}', "
             f"'{password}', '{now}', '{now}');")
    conn = con3()
    cursor = conn.cursor()
    cursor.execute(query)
    conn.commit()
    conn.close()
    return cursor.lastrowid


def get_user(id: int):
    query = f"SELECT * FROM users WHERE id = {id};"
    conn = con3()
    cursor = conn.cursor()
    cursor.execute(query)
    user = cursor.fetchone()
    conn.close()
    return user


def get_user_by_email(email: str):
    query = f"SELECT * FROM users WHERE email = '{email}';"
    conn = con3()
    cursor = conn.cursor()
    cursor.execute(query)
    user = cursor.fetchone()
    conn.close()
    return user


def delete_user(id: int):
    query = f"DELETE FROM habits WHERE user_id = {id};"
    query2 = f"DELETE FROM users WHERE id = {id};"
    conn = con3()
    cursor = conn.cursor()
    cursor.execute(query)
    cursor.execute(query2)
    conn.commit()
    conn.close()


def create_habit(name: str, user_id: int, times: int, unit: int, slot: int, note: str | None=None):
    now = datetime.now().isoformat()
    query = (f"INSERT INTO habits (user_id, name, note, times, unit, list_index, created_at, updated_at) VALUES ('{user_id}', "
             f"'{name}', '{note}', '{times}', '{unit}', '{slot}', '{now}', '{now}');")
    conn = con3()
    cursor = conn.cursor()
    cursor.execute(query)
    conn.commit()
    conn.close()
    return cursor.lastrowid

def get_next_slot():
    query = f"SELECT slot FROM habits ORDER BY slot DESC LIMIT 1;"
    conn = con3()
    cursor = conn.cursor()
    cursor.execute(query)
    slot = cursor.fetchone()
    conn.close()
    return slot[0] + 1 if slot else 0


def get_habit(id: int):
    query = f"SELECT * FROM habits WHERE id = {id};"
    conn = con3()
    cursor = conn.cursor()
    cursor.execute(query)
    habit = cursor.fetchone()
    conn.close()
    return habit


def get_habits(user_id: int):
    query = f"SELECT * FROM habits WHERE user_id = {user_id};"
    conn = con3()
    cursor = conn.cursor()
    cursor.execute(query)
    habits = cursor.fetchall()
    conn.close()
    return habits


def delete_habit(id: int):
    query = f"DELETE FROM habits WHERE id = {id};"
    conn = con3()
    cursor = conn.cursor()
    cursor.execute(query)
    conn.commit()
    conn.close()