"""Framework classes for generation of bignum mod_raw test cases."""
# Copyright The Mbed TLS Contributors
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from abc import ABCMeta
from typing import Dict, Iterator, List

from . import test_case
from . import test_data_generation
from . import bignum_common

class BignumModRawTarget(test_data_generation.BaseTarget, metaclass=ABCMeta):
    #pylint: disable=abstract-method
    """Target for bignum mod_raw test case generation."""
    target_basename = 'test_suite_bignum_mod_raw.generated'

class BignumModRawOperation(bignum_common.OperationCommon, BignumModRawTarget, metaclass=ABCMeta):
    #pylint: disable=abstract-method
    """Target for bignum mod_raw test case generation."""

    def __init__(self, val_n: str, val_a: str, val_b: str = "0", bits_in_limb: int = 64) -> None:
        super().__init__(val_a=val_a, val_b=val_b)
        self.val_n = val_n
        self.bits_in_limb = bits_in_limb

    @property
    def int_n(self) -> int:
        return bignum_common.hex_to_int(self.val_n)

    @property
    def boundary(self) -> int:
        data_in = [self.int_a, self.int_b, self.int_n]
        return max([n for n in data_in if n is not None])

    @property
    def limbs(self) -> int:
        return bignum_common.limbs_mpi(self.boundary, self.bits_in_limb)

    @property
    def hex_digits(self) -> int:
        return 2 * (self.limbs * self.bits_in_limb // 8)

    @property
    def hex_n(self) -> str:
        return "{:x}".format(self.int_n).zfill(self.hex_digits)

    @property
    def hex_a(self) -> str:
        return "{:x}".format(self.int_a).zfill(self.hex_digits)

    @property
    def hex_b(self) -> str:
        return "{:x}".format(self.int_b).zfill(self.hex_digits)

    @property
    def r(self) -> int: # pylint: disable=invalid-name
        l = bignum_common.limbs_mpi(self.int_n, self.bits_in_limb)
        return bignum_common.bound_mpi_limbs(l, self.bits_in_limb)

    @property
    def r_inv(self) -> int:
        return bignum_common.invmod(self.r, self.int_n)

    @property
    def r2(self) -> int: # pylint: disable=invalid-name
        return pow(self.r, 2)

class BignumModRawOperationArchSplit(BignumModRawOperation):
    #pylint: disable=abstract-method
    """Common features for bignum mod raw operations where the result depends on
    the limb size."""

    limb_sizes = [32, 64] # type: List[int]

    def __init__(self, val_n: str, val_a: str, val_b: str = "0", bits_in_limb: int = 64) -> None:
        super().__init__(val_n=val_n, val_a=val_a, val_b=val_b, bits_in_limb=bits_in_limb)

        if bits_in_limb not in self.limb_sizes:
            raise ValueError("Invalid number of bits in limb!")

        self.dependencies = ["MBEDTLS_HAVE_INT{:d}".format(bits_in_limb)]

    @classmethod
    def generate_function_tests(cls) -> Iterator[test_case.TestCase]:
        for a_value, b_value in cls.get_value_pairs():
            for bil in cls.limb_sizes:
                yield cls(a_value, b_value, bits_in_limb=bil).create_test_case()
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class BignumModRawConvertToMont(BignumModRawOperationArchSplit):
    """ Test cases for mpi_mod_raw_to_mont_rep(). """

    test_function = "mpi_mod_raw_to_mont_rep"
    test_name = "Convert into Mont: "

    test_data_moduli = ["b",
                        "fd",
                        "eeff99aa37",
                        "eeff99aa11",
                        "800000000005",
                        "7fffffffffffffff",
                        "80fe000a10000001",
                        "25a55a46e5da99c71c7",
                        "1058ad82120c3a10196bb36229c1",
                        "7e35b84cb19ea5bc57ec37f5e431462fa962d98c1e63738d4657f"
                        "18ad6532e6adc3eafe67f1e5fa262af94cee8d3e7268593942a2a"
                        "98df75154f8c914a282f8b",
                        "8335616aed761f1f7f44e6bd49e807b82e3bf2bf11bfa63",
                        "ffcece570f2f991013f26dd5b03c4c5b65f97be5905f36cb4664f"
                        "2c78ff80aa8135a4aaf57ccb8a0aca2f394909a74cef1ef6758a6"
                        "4d11e2c149c393659d124bfc94196f0ce88f7d7d567efa5a649e2"
                        "deefaa6e10fdc3deac60d606bf63fc540ac95294347031aefd73d"
                        "6a9ee10188aaeb7a90d920894553cb196881691cadc51808715a0"
                        "7e8b24fcb1a63df047c7cdf084dd177ba368c806f3d51ddb5d389"
                        "8c863e687ecaf7d649a57a46264a582f94d3c8f2edaf59f77a7f6"
                        "bdaf83c991e8f06abe220ec8507386fce8c3da84c6c3903ab8f3a"
                        "d4630a204196a7dbcbd9bcca4e40ec5cc5c09938d49f5e1e6181d"
                        "b8896f33bb12e6ef73f12ec5c5ea7a8a337"
                        ]

    test_input_numbers = ["0",
                          "1",
                          "97",
                          "f5",
                          "6f5c3",
                          "745bfe50f7",
                          "ffa1f9924123",
                          "334a8b983c79bd",
                          "5b84f632b58f3461",
                          "19acd15bc38008e1",
                          "ffffffffffffffff",
                          "54ce6a6bb8247fa0427cfc75a6b0599",
                          "fecafe8eca052f154ce6a6bb8247fa019558bfeecce9bb9",
                          "a87d7a56fa4bfdc7da42ef798b9cf6843d4c54794698cb14d72"
                          "851dec9586a319f4bb6d5695acbd7c92e7a42a5ede6972adcbc"
                          "f68425265887f2d721f462b7f1b91531bac29fa648facb8e3c6"
                          "1bd5ae42d5a59ba1c89a95897bfe541a8ce1d633b98f379c481"
                          "6f25e21f6ac49286b261adb4b78274fe5f61c187581f213e84b"
                          "2a821e341ef956ecd5de89e6c1a35418cd74a549379d2d4594a"
                          "577543147f8e35b3514e62cf3e89d1156cdc91ab5f4c928fbd6"
                          "9148c35df5962fed381f4d8a62852a36823d5425f7487c13a12"
                          "523473fb823aa9d6ea5f42e794e15f2c1a8785cf6b7d51a4617"
                          "947fb3baf674f74a673cf1d38126983a19ed52c7439fab42c2185"
                          ]

    descr_tpl = '{} #{} N: \"{}\" A: \"{}\".'

    def result(self) -> List[str]:
        return [self.hex_x]

    def arguments(self) -> List[str]:
        return [bignum_common.quote_str(n) for n in [self.hex_n,
                                                     self.hex_a,
                                                     self.hex_x]]

    def description(self) -> str:
        return self.descr_tpl.format(self.test_name,
                                     self.count,
                                     self.int_n,
                                     self.int_a)

    @classmethod
    def generate_function_tests(cls) -> Iterator[test_case.TestCase]:
        for bil in [32, 64]:
            for n in cls.test_data_moduli:
                for i in cls.test_input_numbers:
                    # Skip invalid combinations where A.limbs > N.limbs
                    if bignum_common.hex_to_int(i) > bignum_common.hex_to_int(n):
                        continue
                    yield cls(n, i, bits_in_limb=bil).create_test_case()

    @property
    def x(self) -> int: # pylint: disable=invalid-name
        return (self.int_a * self.r) % self.int_n

    @property
    def hex_x(self) -> str:
        return "{:x}".format(self.x).zfill(self.hex_digits)

class BignumModRawConvertFromMont(BignumModRawConvertToMont):
    """ Test cases for mpi_mod_raw_from_mont_rep(). """

    test_function = "mpi_mod_raw_from_mont_rep"
    test_name = "Convert from Mont: "

    test_input_numbers = ["0",
                          "1",
                          "3ca",
                          "539ed428",
                          "7dfe5c6beb35a2d6",
                          "dca8de1c2adfc6d7aafb9b48e",
                          "a7d17b6c4be72f3d5c16bf9c1af6fc933",
                          "2fec97beec546f9553142ed52f147845463f579",
                          "378dc83b8bc5a7b62cba495af4919578dce6d4f175cadc4f",
                          "b6415f2a1a8e48a518345db11f56db3829c8f2c6415ab4a395a"
                          "b3ac2ea4cbef4af86eb18a84eb6ded4c6ecbfc4b59c2879a675"
                          "487f687adea9d197a84a5242a5cf6125ce19a6ad2e7341f1c57"
                          "d43ea4f4c852a51cb63dabcd1c9de2b827a3146a3d175b35bea"
                          "41ae75d2a286a3e9d43623152ac513dcdea1d72a7da846a8ab3"
                          "58d9be4926c79cfb287cf1cf25b689de3b912176be5dcaf4d4c"
                          "6e7cb839a4a3243a6c47c1e2c99d65c59d6fa3672575c2f1ca8"
                          "de6a32e854ec9d8ec635c96af7679fce26d7d159e4a9da3bd74"
                          "e1272c376cd926d74fe3fb164a5935cff3d5cdb92b35fe2cea32"
                          "138a7e6bfbc319ebd1725dacb9a359cbf693f2ecb785efb9d627"
                         ]

    @property
    def x(self): # pylint: disable=invalid-name
        return (self.int_a * self.r_inv) % self.int_n
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