"""STIX 2 Common Data Types and Properties"""

import re

from .base import _STIXBase
from .properties import Property, BooleanProperty
from .utils import NOW

ref_regex = ("^[a-z][a-z-]+[a-z]--[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}"
             "-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$")

REF_PROPERTY = {
    'validate': (lambda x, val: re.match(ref_regex, val)),
    'error_msg': "{type} {field} values must consist of a valid STIX type name and a valid UUID, separated by '--'."
}

COMMON_PROPERTIES = {
    # 'type' and 'id' should be defined on each individual type
    'created': {
        'default': NOW,
    },
    'modified': {
        'default': NOW,
    },
    'external_references': {},
    'revoked': BooleanProperty(),
    'created_by_ref': REF_PROPERTY
}


class ExternalReference(_STIXBase):
    _properties = {
        'source_name': Property(required=True),
        'description': Property(),
        'url': Property(),
        'external_id': Property(),
    }


class KillChainPhase(_STIXBase):
    _properties = {
        'kill_chain_name': {
            'required': True,
        },
        'phase_name': {
            'required': True,
        },
    }