from __future__ import annotations
import json

__id_counter__ = 0

def __generate_id__() :
    global __id_counter__
    ret = __id_counter__
    __id_counter__ += 1

    return ret

class PrivilegeError(Exception):
  code = 403
  description = "Access Denied - this function cannot be executed with your current level of privilege"


import logging
if __name__ == "__main__" :
    from app_logging import logger_name
else :
    from utility.app_logging import logger_name

logger = logging.getLogger(logger_name + ".PRIVILEGE")

class Privilege_Role :
    def __init__(self, name, description = None, exclusive : bool = False,id = None) :
        if not id :
            self.__id__ = __generate_id__()
        else :
            self.__id__
        self.name = name
        self.exclusive = exclusive
        if description :
            self.description = description

        self.aggregated_roles = set([self])

    @property
    def id(self):
        return self.__id__

    @property
    def aggregated_roles_ids(self):
        ret = list()
        for item in self.aggregated_roles :
            ret.append(item.id)

        return ret



class Privilege_Domain :



    def __init__(self, name, description = None,id = None) :
        if not id :
            self.__id__ = __generate_id__()
        else :
            self.__id__
        self.name = name
        self.description = description
        self.__roles__                : set[Privilege_Role] = set()


    def add_role(self,role : Privilege_Role) :
        for tmp_role in self.__roles__ :
            if tmp_role.name == role.name :
                logger.error("can't have role with the same name in a specific domain")
                raise BaseException("can't have role with the same name in a specific domain")
        self.__roles__.add(role)

    def remove_role(self,role : Privilege_Role) :
        self.__roles__.remove(role)

    @property
    def id(self):
        return self.__id__

    @property
    def roles(self):
        return self.__roles__.copy()


    def get_role_by_name(self,name : str):
        for tmp_role in self.__roles__ :
            if tmp_role.name == name :
                return tmp_role

    def get_role_by_id(self,id : int):
        for tmp_role in self.__roles__ :
            if tmp_role.id == id :
                return tmp_role

    #include role 2 in role 1
    def include_role(self,role1 : Privilege_Role, role2 : Privilege_Role) :

        if role1 not in self.__roles__ or role2 not in self.__roles__ :
            logger.error("roles are not in domains.")
            raise Exception("roles are not in domains.")

        if role1.exclusive :
            logger.error("cannot include role, destination role is exclusive")
            raise Exception("cannot include role, destination role is exclusive")

        role1.aggregated_roles.add(role2)



    #uninclude role 2 in role 1
    def uninclude_role(self,role1 : Privilege_Role, role2 : Privilege_Role) :

        if role1 not in self.__roles__ or role2 not in self.__roles__ :
            raise BaseException("roles are not in domains.")

        if role1 == role2 :
            raise BaseException("cannont include the role of himself")

        if role2 in role1.aggregated_roles :
            role1.aggregated_roles.remove(role2)


    @property
    def roles(self):
        return self.__roles__.copy()



    def check_role_by_id(self,role_id : int,role : Privilege_Role) :
        found = False
        for item in self.__roles__ :
            if item == role :
                found = True # at least one role is associated with this id
                if item.id == role_id :
                    return True

        if not found :
            raise BaseException("id is not associated with any role !")

        return False


    def check_role_by_name(self,role_name : str,role : Privilege_Role) :
        found = False
        for item in self.__roles__ :
            if item == role :
                found = True # at least one role is associated with this id
                if item.name == role_name :
                    return True

        if not found :
            raise BaseException("id is not associated with any role !")

        return False




class Privilege_Manager :

    class Privilege_User :

        def __init__(self,manager : Privilege_Manager, privileges_data_str : str,is_super_admin : bool = False,id : int = None) -> None:

            if not id :
                self.__id__ = __generate_id__()
            else :
                self.__id__ = id

            self.is_super_admin : bool = is_super_admin
            self.manager = manager


            self.roles : set[Privilege_Role] = set()

            if privileges_data_str :
                privileges_data = json.loads(privileges_data_str)


                for key in privileges_data.keys() :
                    self.roles.add(manager.get_role_by_domain_and_name(key,privileges_data[key]))


        def get_roles(self) -> set[Privilege_Role]:
            return self.roles

        def roles_to_jsonStr(self) -> str :
            ret_dict = dict()
            for role in self.roles :
                domain = self.manager.get_role_domain(role)

                ret_dict[domain.name] = role.name

            return json.dumps(ret_dict)

        @property
        def id(self):
            return self.__id__







    __domains__ :  set[Privilege_Domain] = set()
    __users__   :  set[Privilege_User] = set()

    def create_domain(self, name : str, description : str = None) :
        for item in self.__domains__ :
            if item.name == name :
                logger.error("cannot have two privilege domain with the same name !")
                raise BaseException("cannot have two privilege domain with the same name !")

        domain = Privilege_Domain(name=name,description=description)
        self.__domains__.add(domain)
        logger.info("domain with name " + name + " created")


    def register_domain(self, domain : Privilege_Domain) :
        for item in self.__domains__ :
            if item.name == domain.name :
                logger.error("cannot have two privilege domain with the same name !")
                raise BaseException("cannot have two privilege domain with the same name !")

        self.__domains__.add(domain)
        logger.info("domain with name " + domain.name + " registered")



    def remove_domain(self, name : str) :
        for item in list(self.__domains__) :
            if item.name == name :
                self.__domains__.remove(item)
                logger.info("domain with name " + name + "removed")
                return

        logger.error("privilege domain remove failed ! item with name " + name + "not found")
        raise BaseException("privilege domain remove failed ! item not found")

    @property
    def domains(self):
        return self.__domains__.copy()


    def get_domain_by_name(self, name : str) :
        for item in self.__domains__ :
            if item.name == name :
                return item

        raise BaseException("domain not found with this name : " + str(name))


    def check_role_by_name(self,domain_name : str, role_name : str,role : Privilege_Role) :

        domain = self.get_domain_by_name(domain_name)
        return domain.check_role_by_name(role_name,role)


    def get_roles_by_ids(self,ids : set[int]) -> set[Privilege_Role]:
        ret_roles = set()
        for id in ids :
            for domain in self.domains :
                try :
                    ret_roles.add(domain.get_role_by_id(id))
                except :
                    pass
        return ret_roles



    def get_role_by_domain_and_name(self,domain_name : str, role_name : str) :
        domain = self.get_domain_by_name(domain_name)
        return domain.get_role_by_name(role_name)


    def get_roles_by_names(self,roles_names : set[tuple[str,str]]) :
        ret_roles = set()
        for item in roles_names :
            try :
                ret_roles.add(self.get_role_by_domain_and_name(item[0],item[1]))
            except :
                pass

        return ret_roles

    def is_role_registered(self,role : Privilege_Role) :
        for domain in self.domains :
            if role in domain.roles :
                    return True

        return False

    def get_role_domain(self,role : Privilege_Role) :
        for domain in self.domains :
            for item in domain.roles :
                if item == role :
                    return domain

        logger.error("this role is not associated with any domain")
        raise BaseException("this role is not associated with any domain")

    def roles_to_ids(roles : list[Privilege_Role]) :
        ret = []
        for role in roles :
            ret.append(role.aggregated_roles_ids)

        return ret


    #its a DECORATOR
    def require_authorization(self,required_role : Privilege_Role, get_privilege_func : callable) :

        def wrapper_of_wrap(f) :
            def wrap(*args, **kwargs):
                if not self.is_role_registered(required_role) :
                    raise BaseException("required role is not registered anywhere")
                logger.debug("checking authorization with roles for function " + f.__name__ + ": " )
                logger.debug("required role :  " + required_role.name )
                privileges : Privilege_Manager.Privilege_User = get_privilege_func()

                if privileges.is_super_admin :
                    logger.debug("user is super admin, access granted")
                    return f(*args, **kwargs)

                for role in privileges.roles : #an user can have multiple roles and each role can include other roles.
                    logger.debug("checking role : " + role.name)
                    for aggregated_role in role.aggregated_roles :

                        if aggregated_role == required_role :
                            logger.debug("access granted")
                            return f(*args, **kwargs)

                def raiser(*args, **kwargs):
                    logger.warning("access denied for function :" +  f.__name__)
                    raise PrivilegeError("Access Denied")
                return raiser(*args, **kwargs)

            #we change the name of the function, for flash bluerprint, as we cannot register two function with the same name.
            wrap.__name__ = f.__name__ + "_authorization_wrap"
            return wrap

        return wrapper_of_wrap









def test() :
    manager = Privilege_Manager()

    manager.create_domain(name="inventory",description="privilege domain for inventory")

    inventory_privilege_domain = manager.get_domain_by_name("inventory")

    role1 = Privilege_Role(name="simple")
    role2 = Privilege_Role(name="intermediate")
    role3 = Privilege_Role(name="speciale")
    role4 = Privilege_Role(name="admin")


    inventory_privilege_domain.add_role(role1)
    inventory_privilege_domain.add_role(role2)
    inventory_privilege_domain.add_role(role3)
    inventory_privilege_domain.add_role(role4)

    user_role_ids = []

    def get_roles() :
        return user_role_ids


    def hello_simple() :
        print("hello_simple")


    def hello_intermediate() :
        print("hello_intermediate")

    @manager.require_authorization(role4,get_roles)
    def hello_admin(arg1,arg2) :

        print("hello_admin")
        print(str(arg1))
        print(str(arg2))

    @manager.require_authorization(role3,get_roles)
    def hello_speciale() :
        print("hello_speciale")





    inventory_privilege_domain.include_role(role4,role1)
    inventory_privilege_domain.include_role(role4,role2)
    inventory_privilege_domain.include_role(role4,role4)





    for item in inventory_privilege_domain.roles :
        print(item.name)

    try :
        hello_admin(23,45)
        return False
    except Exception as Ex:
        print(str(Ex))


    user_role_ids.append(role4.id)

    hello_admin(23,45)

    hello_intermediate()


    try :
        hello_speciale()
        return False
    except Exception as Ex:
        print(str(Ex))

    return True

if __name__ == "__main__" :
    test()