from enum import Enum
from typing import Dict, Optional
from sqlalchemy import Table, Column, and_
from sqlalchemy.types import Integer, String, TIMESTAMP
from sqlalchemy.sql.schema import ForeignKey
from sqlalchemy.sql import func
from sqlalchemy.dialects.mysql import insert
from sqlalchemy.sql import func, select, Delete
from uuid import uuid4
from datetime import datetime, timedelta
from sqlalchemy.engine import Row
import bcrypt

from core.data.schema.base import BaseData, metadata

aime_user = Table(
    "aime_user",
    metadata,
    Column("id", Integer, nullable=False, primary_key=True, autoincrement=True),
    Column("username", String(25), unique=True),
    Column("email", String(255), unique=True),
    Column("password", String(255)),
    Column("permissions", Integer),    
    Column("created_date", TIMESTAMP, server_default=func.now()),
    Column("last_login_date", TIMESTAMP, onupdate=func.now()),
    Column("suspend_expire_time", TIMESTAMP),
    mysql_charset='utf8mb4'
)

class PermissionBits(Enum):
    PermUser = 1
    PermMod = 2
    PermSysAdmin = 4

class UserData(BaseData):
    def create_user(self, id: int = None, username: str = None, email: str = None, password: str = None, permission: int = 1) -> Optional[int]:
        if email is None:
            permission = 1

        if id is None:
            sql = insert(aime_user).values(
                username=username, 
                email=email, 
                password=password, 
                permissions=permission
            )
        else:
            sql = insert(aime_user).values(
                id=id, 
                username=username, 
                email=email, 
                password=password, 
                permissions=permission
            )

        conflict = sql.on_duplicate_key_update(
            username=username, 
            email=email, 
            password=password, 
            permissions=permission
        )
        
        result = self.execute(conflict)
        if result is None: return None
        return result.lastrowid
    
    def get_user(self, user_id: int) -> Optional[Row]:
        sql = select(aime_user).where(aime_user.c.id == user_id)
        result = self.execute(sql)
        if result is None: return False
        return result.fetchone()
    
    def check_password(self, user_id: int, passwd: bytes = None) -> bool:
        usr = self.get_user(user_id)
        if usr is None: return False

        if usr['password'] is None:
            return False

        return bcrypt.checkpw(passwd, usr['password'].encode())

    def reset_autoincrement(self, ai_value: int) -> None:
        # ALTER TABLE isn't in sqlalchemy so we do this the ugly way
        sql = f"ALTER TABLE aime_user AUTO_INCREMENT={ai_value}"
        self.execute(sql)