def reverse_obj( obj):
    """Меняет местами ключ и значение"""
    return {status_code: name for name, status_code in obj.items()}

class Ticket:
    TICKET_TYPES = (
        (1, "ST_REQUEST", [
            [111, 121, 149, 159],
            [110, 121, 149, 159],
            [121, 131, 149, 159],
            [131, 141, 149],
            [141, 151, 110],
            [149, 151, 110],
            [159],
            [151]
        ]),
        (2, "SERVICE_REQUEST", [
            [210, 211, 251],
            [211, 212, 220, 238, 249],
            [212, 221, 229, 238, 249],
            [221, 222, 238, 249],
            [220, 211, 238, 249],
            [229, 211, 251],
            [222, 231, 238, 249],
            [231, 241, 238, 249],
            [238, 231, 239, 211, 212, 221, 220, 222, 249],
            [239, 231, 239, 211, 212, 221, 220, 222, 249],
            [241, 251],
            [249, 251],
            [251]
        ]),
        (3, "ACCESS_REQUEST", [
            [320, 321, 359],
            [321, 359, 451],
            [359, 351]
            [351]
        ]),
        (4, "NEG_REQUEST", [
            [420, 421, 459],
            [421, 459, 451],
            [459, 451]
            [451]
        ])
    )

    request_type = {
        "NEW": 111,
        "REOPENED": 110,
        "ASSIGNED": 121,
        "IN_PROCESS": 131,
        "WONTFIX": 149,
        "DONE": 141,
        "DUPLICATE": 159,
        "CLOSED": 151
    }

    service_request_type = {
        "TEMPLATE": 210,
        "BOOKED": 211,
        "ASSIGNED": 212,
        "ACCEPTED": 221,
        "PENDING": 220,
        "DECLINED": 229,
        "PRE_START": 222,
        "PROCESS": 231,
        "PRE_FORCEMAJEUER": 238,
        "FORCEMAJEUER": 239,
        "DONE": 241,
        "CANCELLED": 249,
        "CLOSED": 251
    }

    access_request_type = {
        "PENDING": 320,
        "ACCEPTED": 321,
        "DECLINED": 359,
        "CLOSED": 351
    }

    neg_request_type = {
        "PENDING": 420,
        "ACCEPTED": 421,
        "DECLINED": 459,
        "CLOSED": 451
    }

    TICKET_STATUSES_NAMES = reverse_obj(request_type) | \
        reverse_obj(service_request_type) | \
        reverse_obj(access_request_type) | \
        reverse_obj(neg_request_type)


    TICKET_TYPES_CHOICES = tuple((item[0], item[1]) for item in TICKET_TYPES)
    LIFE_CYCLE_DICT = dict((item[0], item[2]) for item in TICKET_TYPES)