from __future__ import division

from . import der, ecdsa
from .util import orderlen


# orderlen was defined in this module previously, so keep it in __all__,
# will need to mark it as deprecated later
__all__ = [
    "UnknownCurveError",
    "orderlen",
    "Curve",
    "NIST192p",
    "NIST224p",
    "NIST256p",
    "NIST384p",
    "NIST521p",
    "curves",
    "find_curve",
    "SECP256k1",
    "BRAINPOOLP160r1",
    "BRAINPOOLP192r1",
    "BRAINPOOLP224r1",
    "BRAINPOOLP256r1",
    "BRAINPOOLP320r1",
    "BRAINPOOLP384r1",
    "BRAINPOOLP512r1",
]


class UnknownCurveError(Exception):
    pass


class Curve:
    def __init__(self, name, curve, generator, oid, openssl_name=None):
        self.name = name
        self.openssl_name = openssl_name  # maybe None
        self.curve = curve
        self.generator = generator
        self.order = generator.order()
        self.baselen = orderlen(self.order)
        self.verifying_key_length = 2 * self.baselen
        self.signature_length = 2 * self.baselen
        self.oid = oid
        self.encoded_oid = der.encode_oid(*oid)

    def __repr__(self):
        return self.name


# the NIST curves
NIST192p = Curve(
    "NIST192p",
    ecdsa.curve_192,
    ecdsa.generator_192,
    (1, 2, 840, 10045, 3, 1, 1),
    "prime192v1",
)


NIST224p = Curve(
    "NIST224p",
    ecdsa.curve_224,
    ecdsa.generator_224,
    (1, 3, 132, 0, 33),
    "secp224r1",
)


NIST256p = Curve(
    "NIST256p",
    ecdsa.curve_256,
    ecdsa.generator_256,
    (1, 2, 840, 10045, 3, 1, 7),
    "prime256v1",
)


NIST384p = Curve(
    "NIST384p",
    ecdsa.curve_384,
    ecdsa.generator_384,
    (1, 3, 132, 0, 34),
    "secp384r1",
)


NIST521p = Curve(
    "NIST521p",
    ecdsa.curve_521,
    ecdsa.generator_521,
    (1, 3, 132, 0, 35),
    "secp521r1",
)


SECP256k1 = Curve(
    "SECP256k1",
    ecdsa.curve_secp256k1,
    ecdsa.generator_secp256k1,
    (1, 3, 132, 0, 10),
    "secp256k1",
)


BRAINPOOLP160r1 = Curve(
    "BRAINPOOLP160r1",
    ecdsa.curve_brainpoolp160r1,
    ecdsa.generator_brainpoolp160r1,
    (1, 3, 36, 3, 3, 2, 8, 1, 1, 1),
    "brainpoolP160r1",
)


BRAINPOOLP192r1 = Curve(
    "BRAINPOOLP192r1",
    ecdsa.curve_brainpoolp192r1,
    ecdsa.generator_brainpoolp192r1,
    (1, 3, 36, 3, 3, 2, 8, 1, 1, 3),
    "brainpoolP192r1",
)


BRAINPOOLP224r1 = Curve(
    "BRAINPOOLP224r1",
    ecdsa.curve_brainpoolp224r1,
    ecdsa.generator_brainpoolp224r1,
    (1, 3, 36, 3, 3, 2, 8, 1, 1, 5),
    "brainpoolP224r1",
)


BRAINPOOLP256r1 = Curve(
    "BRAINPOOLP256r1",
    ecdsa.curve_brainpoolp256r1,
    ecdsa.generator_brainpoolp256r1,
    (1, 3, 36, 3, 3, 2, 8, 1, 1, 7),
    "brainpoolP256r1",
)


BRAINPOOLP320r1 = Curve(
    "BRAINPOOLP320r1",
    ecdsa.curve_brainpoolp320r1,
    ecdsa.generator_brainpoolp320r1,
    (1, 3, 36, 3, 3, 2, 8, 1, 1, 9),
    "brainpoolP320r1",
)


BRAINPOOLP384r1 = Curve(
    "BRAINPOOLP384r1",
    ecdsa.curve_brainpoolp384r1,
    ecdsa.generator_brainpoolp384r1,
    (1, 3, 36, 3, 3, 2, 8, 1, 1, 11),
    "brainpoolP384r1",
)


BRAINPOOLP512r1 = Curve(
    "BRAINPOOLP512r1",
    ecdsa.curve_brainpoolp512r1,
    ecdsa.generator_brainpoolp512r1,
    (1, 3, 36, 3, 3, 2, 8, 1, 1, 13),
    "brainpoolP512r1",
)


curves = [
    NIST192p,
    NIST224p,
    NIST256p,
    NIST384p,
    NIST521p,
    SECP256k1,
    BRAINPOOLP160r1,
    BRAINPOOLP192r1,
    BRAINPOOLP224r1,
    BRAINPOOLP256r1,
    BRAINPOOLP320r1,
    BRAINPOOLP384r1,
    BRAINPOOLP512r1,
]


def find_curve(oid_curve):
    for c in curves:
        if c.oid == oid_curve:
            return c
    raise UnknownCurveError(
        "I don't know about the curve with oid %s."
        "I only know about these: %s" % (oid_curve, [c.name for c in curves])
    )
