import enum

from nntp.tiny.db     import Database, DatabaseTable
from nntp.tiny.passwd import compare

class UserPermission(enum.Flag):
    NONE  = 0
    READ  = 1
    POST  = enum.auto()
    KILL  = enum.auto()
    GROUP = enum.auto()

    def __str__(self):
        return {
            1: 'READ',
            2: 'POST',
            3: 'KILL',
            4: 'GROUP'
        }[self.value]

class User(DatabaseTable):
    name    = 'server_user'
    key     = 'id'
    columns = 'id', 'active', 'username', 'password', 'fullname', 'mail',

    def auth(self, password: str):
        if self.active is False or self.password is None or self.password == '':
            return False

        return compare(password, self.password)

    def permissions(self, db: Database) -> UserPermission:
        perms = UserPermission.NONE

        sql = """
            select
                perm.name
            from
                server_permission perm,
                server_user_permission user_perm
            where
                perm.id = user_perm.permission_id
                and user_perm.user_id = ?
        """

        cr = db.execute(sql, (self.id,))

        while True:
            row = cr.fetchone()

            if row is None:
                break

            perms |= UserPermission[row[0]]

        return perms