# Copyright (c) Ansible Project
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import annotations

import os.path
import typing as t
from getpass import getuser
from os import remove, rmdir
from socket import gethostname
from tempfile import mkdtemp

import pytest
from ansible_collections.community.crypto.plugins.module_utils._openssh.cryptography import (
    HAS_OPENSSH_SUPPORT,
    InvalidCommentError,
    InvalidKeySizeError,
    InvalidKeyTypeError,
    InvalidPassphraseError,
    InvalidPrivateKeyFileError,
    InvalidPublicKeyFileError,
    OpensshKeypair,
)


if t.TYPE_CHECKING:
    from ansible_collections.community.crypto.plugins.module_utils._openssh.cryptography import (
        KeyType,
    )


DEFAULT_KEY_PARAMS: list[tuple[KeyType, int | None, bytes | None, str | None]] = [
    (
        "rsa",
        None,
        None,
        None,
    ),
    (
        "dsa",
        None,
        None,
        None,
    ),
    (
        "ecdsa",
        None,
        None,
        None,
    ),
    (
        "ed25519",
        None,
        None,
        None,
    ),
]

VALID_USER_KEY_PARAMS: list[tuple[KeyType, int | None, bytes | None, str | None]] = [
    (
        "rsa",
        8192,
        "change_me".encode("UTF-8"),
        "comment",
    ),
    (
        "dsa",
        1024,
        "change_me".encode("UTF-8"),
        "comment",
    ),
    (
        "ecdsa",
        521,
        "change_me".encode("UTF-8"),
        "comment",
    ),
    (
        "ed25519",
        256,
        "change_me".encode("UTF-8"),
        "comment",
    ),
]

INVALID_USER_KEY_PARAMS: list[tuple[KeyType, int | None, bytes | None, str | None]] = [
    (
        "dne",  # type: ignore
        None,
        None,
        None,
    ),
    (
        "rsa",
        None,
        [1, 2, 3],  # type: ignore
        "comment",
    ),
    (
        "ecdsa",
        None,
        None,
        [1, 2, 3],  # type: ignore
    ),
]

INVALID_KEY_SIZES: list[tuple[KeyType, int | None, bytes | None, str | None]] = [
    (
        "rsa",
        1023,
        None,
        None,
    ),
    (
        "rsa",
        16385,
        None,
        None,
    ),
    (
        "dsa",
        256,
        None,
        None,
    ),
    (
        "ecdsa",
        1024,
        None,
        None,
    ),
    (
        "ed25519",
        1024,
        None,
        None,
    ),
]


@pytest.mark.parametrize("keytype,size,passphrase,comment", DEFAULT_KEY_PARAMS)
@pytest.mark.skipif(not HAS_OPENSSH_SUPPORT, reason="requires cryptography")
def test_default_key_params(
    keytype: KeyType, size: int | None, passphrase: bytes | None, comment: str | None
) -> None:
    result = True

    default_sizes = {
        "rsa": 2048,
        "dsa": 1024,
        "ecdsa": 256,
        "ed25519": 256,
    }

    default_comment = f"{getuser()}@{gethostname()}"
    pair = OpensshKeypair.generate(
        keytype=keytype, size=size, passphrase=passphrase, comment=comment
    )
    try:
        pair = OpensshKeypair.generate(
            keytype=keytype, size=size, passphrase=passphrase, comment=comment
        )
        if pair.size != default_sizes[pair.key_type] or pair.comment != default_comment:
            result = False
    except Exception as e:
        print(e)
        result = False

    assert result


@pytest.mark.parametrize("keytype,size,passphrase,comment", VALID_USER_KEY_PARAMS)
@pytest.mark.skipif(not HAS_OPENSSH_SUPPORT, reason="requires cryptography")
def test_valid_user_key_params(
    keytype: KeyType, size: int | None, passphrase: bytes | None, comment: str | None
) -> None:
    result = True

    try:
        pair = OpensshKeypair.generate(
            keytype=keytype, size=size, passphrase=passphrase, comment=comment
        )
        if pair.key_type != keytype or pair.size != size or pair.comment != comment:
            result = False
    except Exception as e:
        print(e)
        result = False

    assert result


@pytest.mark.parametrize("keytype,size,passphrase,comment", INVALID_USER_KEY_PARAMS)
@pytest.mark.skipif(not HAS_OPENSSH_SUPPORT, reason="requires cryptography")
def test_invalid_user_key_params(
    keytype: KeyType, size: int | None, passphrase: bytes | None, comment: str | None
) -> None:
    result = False

    try:
        OpensshKeypair.generate(
            keytype=keytype, size=size, passphrase=passphrase, comment=comment
        )
    except (InvalidCommentError, InvalidKeyTypeError, InvalidPassphraseError):
        result = True
    except Exception as e:
        print(e)

    assert result


@pytest.mark.parametrize("keytype,size,passphrase,comment", INVALID_KEY_SIZES)
@pytest.mark.skipif(not HAS_OPENSSH_SUPPORT, reason="requires cryptography")
def test_invalid_key_sizes(
    keytype: KeyType, size: int | None, passphrase: bytes | None, comment: str | None
) -> None:
    result = False

    try:
        OpensshKeypair.generate(
            keytype=keytype, size=size, passphrase=passphrase, comment=comment
        )
    except InvalidKeySizeError:
        result = True
    except Exception as e:
        print(e)

    assert result


@pytest.mark.skipif(not HAS_OPENSSH_SUPPORT, reason="requires cryptography")
def test_valid_comment_update() -> None:

    pair = OpensshKeypair.generate()
    new_comment = "comment"
    try:
        pair.comment = new_comment
    except Exception as e:
        print(e)

    assert (
        pair.comment == new_comment
        and pair.public_key.split(b" ", 2)[2].decode() == new_comment
    )


@pytest.mark.skipif(not HAS_OPENSSH_SUPPORT, reason="requires cryptography")
def test_invalid_comment_update() -> None:
    result = False

    pair = OpensshKeypair.generate()
    new_comment = [1, 2, 3]
    try:
        pair.comment = new_comment  # type: ignore
    except InvalidCommentError:
        result = True

    assert result


@pytest.mark.skipif(not HAS_OPENSSH_SUPPORT, reason="requires cryptography")
def test_valid_passphrase_update() -> None:
    result = False

    passphrase = "change_me".encode("UTF-8")

    try:
        tmpdir = mkdtemp()
        keyfilename = os.path.join(tmpdir, "id_rsa")

        pair1 = OpensshKeypair.generate()
        pair1.update_passphrase(passphrase)

        with open(keyfilename, "w+b") as keyfile:
            keyfile.write(pair1.private_key)

        with open(keyfilename + ".pub", "w+b") as pubkeyfile:
            pubkeyfile.write(pair1.public_key)

        pair2 = OpensshKeypair.load(path=keyfilename, passphrase=passphrase)

        if pair1 == pair2:
            result = True
    finally:
        if os.path.exists(keyfilename):
            remove(keyfilename)
        if os.path.exists(keyfilename + ".pub"):
            remove(keyfilename + ".pub")
        if os.path.exists(tmpdir):
            rmdir(tmpdir)

    assert result


@pytest.mark.skipif(not HAS_OPENSSH_SUPPORT, reason="requires cryptography")
def test_invalid_passphrase_update() -> None:
    result = False

    passphrase = [1, 2, 3]
    pair = OpensshKeypair.generate()
    try:
        pair.update_passphrase(passphrase)  # type: ignore
    except InvalidPassphraseError:
        result = True

    assert result


@pytest.mark.skipif(not HAS_OPENSSH_SUPPORT, reason="requires cryptography")
def test_invalid_privatekey() -> None:
    result = False

    try:
        tmpdir = mkdtemp()
        keyfilename = os.path.join(tmpdir, "id_rsa")

        pair = OpensshKeypair.generate()

        with open(keyfilename, "w+b") as keyfile:
            keyfile.write(pair.private_key[1:])

        with open(keyfilename + ".pub", "w+b") as pubkeyfile:
            pubkeyfile.write(pair.public_key)

        OpensshKeypair.load(path=keyfilename)
    except InvalidPrivateKeyFileError:
        result = True
    finally:
        if os.path.exists(keyfilename):
            remove(keyfilename)
        if os.path.exists(keyfilename + ".pub"):
            remove(keyfilename + ".pub")
        if os.path.exists(tmpdir):
            rmdir(tmpdir)

    assert result


@pytest.mark.skipif(not HAS_OPENSSH_SUPPORT, reason="requires cryptography")
def test_mismatched_keypair() -> None:
    result = False

    try:
        tmpdir = mkdtemp()
        keyfilename = os.path.join(tmpdir, "id_rsa")

        pair1 = OpensshKeypair.generate()
        pair2 = OpensshKeypair.generate()

        with open(keyfilename, "w+b") as keyfile:
            keyfile.write(pair1.private_key)

        with open(keyfilename + ".pub", "w+b") as pubkeyfile:
            pubkeyfile.write(pair2.public_key)

        OpensshKeypair.load(path=keyfilename)
    except InvalidPublicKeyFileError:
        result = True
    finally:
        if os.path.exists(keyfilename):
            remove(keyfilename)
        if os.path.exists(keyfilename + ".pub"):
            remove(keyfilename + ".pub")
        if os.path.exists(tmpdir):
            rmdir(tmpdir)

    assert result


@pytest.mark.skipif(not HAS_OPENSSH_SUPPORT, reason="requires cryptography")
def test_keypair_comparison() -> None:
    assert OpensshKeypair.generate() != OpensshKeypair.generate()
    assert OpensshKeypair.generate() != OpensshKeypair.generate(keytype="dsa")
    assert OpensshKeypair.generate() != OpensshKeypair.generate(keytype="ed25519")
    assert OpensshKeypair.generate(keytype="ed25519") != OpensshKeypair.generate(
        keytype="ed25519"
    )
    try:
        tmpdir = mkdtemp()

        keys: dict[str, dict[str, t.Any]] = {
            "rsa": {
                "pair": OpensshKeypair.generate(),
                "filename": os.path.join(tmpdir, "id_rsa"),
            },
            "dsa": {
                "pair": OpensshKeypair.generate(
                    keytype="dsa", passphrase="change_me".encode("UTF-8")
                ),
                "filename": os.path.join(tmpdir, "id_dsa"),
            },
            "ed25519": {
                "pair": OpensshKeypair.generate(keytype="ed25519"),
                "filename": os.path.join(tmpdir, "id_ed25519"),
            },
        }

        for v in keys.values():
            with open(v["filename"], "w+b") as keyfile:
                keyfile.write(v["pair"].private_key)
            with open(v["filename"] + ".pub", "w+b") as pubkeyfile:
                pubkeyfile.write(v["pair"].public_key)

        assert keys["rsa"]["pair"] == OpensshKeypair.load(path=keys["rsa"]["filename"])

        loaded_dsa_key = OpensshKeypair.load(
            path=keys["dsa"]["filename"], passphrase="change_me".encode("UTF-8")
        )
        assert keys["dsa"]["pair"] == loaded_dsa_key

        loaded_dsa_key.update_passphrase("change_me_again".encode("UTF-8"))
        assert keys["dsa"]["pair"] != loaded_dsa_key

        loaded_dsa_key.update_passphrase("change_me".encode("UTF-8"))
        assert keys["dsa"]["pair"] == loaded_dsa_key

        loaded_dsa_key.comment = "comment"
        assert keys["dsa"]["pair"] != loaded_dsa_key

        assert keys["ed25519"]["pair"] == OpensshKeypair.load(
            path=keys["ed25519"]["filename"]
        )
    finally:
        for v in keys.values():
            if os.path.exists(v["filename"]):
                remove(v["filename"])
            if os.path.exists(v["filename"] + ".pub"):
                remove(v["filename"] + ".pub")
        if os.path.exists(tmpdir):
            rmdir(tmpdir)
    assert OpensshKeypair.generate() != []