import itertools
from oslo_log import log
LOG = log.getLogger(__name__)


""" an example of authz_buffer, sub_meta_rule_dict, rule_dict
authz_buffer = {
    'subject_uuid': xxx,
    'object_uuid': yyy,
    'action_uuid': zzz,
    'subject_attributes': {
        'subject_category1': [],
        'subject_category2': [],
        ...
        'subject_categoryn': []
    },
    'object_attributes': {},
    'action_attributes': {},
}

sub_meta_rule_dict = {
    "subject_categories": ["subject_security_level", "aaa"],
    "action_categories": ["computing_action"],
    "object_categories": ["object_security_level"],
}

rule_dict = [
    ["high", "vm_admin", "medium", True],
    ["high", "vm_admin", "low", True],
    ["medium", "vm_admin", "low", True],
    ["high", "vm_access", "high", True],
    ["high", "vm_access", "medium", True],
    ["high", "vm_access", "low", True],
    ["medium", "vm_access", "medium", True],
    ["medium", "vm_access", "low", True],
    ["low", "vm_access", "low", True]
]
"""


def inclusion(authz_buffer, sub_meta_rule_dict, rule_list):
    _cat = []
    for subject_cat in sub_meta_rule_dict['subject_categories']:
        if subject_cat in authz_buffer['subject_assignments']:
            _cat.append(authz_buffer['subject_assignments'][subject_cat])
    for action_cat in sub_meta_rule_dict['action_categories']:
        if action_cat in authz_buffer['action_assignments']:
            _cat.append(authz_buffer['action_assignments'][action_cat])
    for object_cat in sub_meta_rule_dict['object_categories']:
        if object_cat in authz_buffer['object_assignments']:
            _cat.append(authz_buffer['object_assignments'][object_cat])

    for _element in itertools.product(*_cat):
        # Add the boolean at the end
        _element = list(_element)
        _element.append(True)
        if _element in rule_list:
            return True

    return False


def comparison(authz_buffer, sub_meta_rule_dict, rule_list):
    return


def all_true(decision_buffer):
    for _rule in decision_buffer:
        if decision_buffer[_rule] == False:
            return False
    return True


def one_true(decision_buffer):
    for _rule in decision_buffer:
        if decision_buffer[_rule] == True:
            return True
    return False