import ast
import base64
import binascii
import os
import traceback
from typing import Any, Optional, Union

import httpx

import litellm
from litellm._logging import print_verbose, verbose_logger
from litellm.caching.caching import DualCache
from litellm.llms.custom_httpx.http_handler import HTTPHandler
from litellm.proxy._types import KeyManagementSystem

oidc_cache = DualCache()


######### Secret Manager ############################
# checks if user has passed in a secret manager client
# if passed in then checks the secret there
def _is_base64(s):
    try:
        return base64.b64encode(base64.b64decode(s)).decode() == s
    except binascii.Error:
        return False


def str_to_bool(value: Optional[str]) -> Optional[bool]:
    """
    Converts a string to a boolean if it's a recognized boolean string.
    Returns None if the string is not a recognized boolean value.

    :param value: The string to be checked.
    :return: True or False if the string is a recognized boolean, otherwise None.
    """
    if value is None:
        return None

    true_values = {"true"}
    false_values = {"false"}

    value_lower = value.strip().lower()

    if value_lower in true_values:
        return True
    elif value_lower in false_values:
        return False
    else:
        return None


def get_secret_str(
    secret_name: str,
    default_value: Optional[Union[str, bool]] = None,
) -> Optional[str]:
    """
    Guarantees response from 'get_secret' is either string or none. Used for fixing linting errors.
    """
    value = get_secret(secret_name=secret_name, default_value=default_value)
    if value is not None and not isinstance(value, str):
        return None

    return value


def get_secret_bool(
    secret_name: str,
    default_value: Optional[bool] = None,
) -> Optional[bool]:
    """
    Guarantees response from 'get_secret' is either boolean or none. Used for fixing linting errors.

    Args:
        secret_name: The name of the secret to get.
        default_value: The default value to return if the secret is not found.

    Returns:
        The secret value as a boolean or None if the secret is not found.
    """
    _secret_value = get_secret(secret_name, default_value)
    if _secret_value is None:
        return None
    elif isinstance(_secret_value, bool):
        return _secret_value
    else:
        return str_to_bool(_secret_value)


def get_secret(  # noqa: PLR0915
    secret_name: str,
    default_value: Optional[Union[str, bool]] = None,
):
    key_management_system = litellm._key_management_system
    key_management_settings = litellm._key_management_settings
    secret = None

    if secret_name.startswith("os.environ/"):
        secret_name = secret_name.replace("os.environ/", "")

    # Example: oidc/google/https://bedrock-runtime.us-east-1.amazonaws.com/model/stability.stable-diffusion-xl-v1/invoke
    if secret_name.startswith("oidc/"):
        secret_name_split = secret_name.replace("oidc/", "")
        oidc_provider, oidc_aud = secret_name_split.split("/", 1)
        # TODO: Add caching for HTTP requests
        if oidc_provider == "google":
            oidc_token = oidc_cache.get_cache(key=secret_name)
            if oidc_token is not None:
                return oidc_token

            oidc_client = HTTPHandler(timeout=httpx.Timeout(timeout=600.0, connect=5.0))
            # https://cloud.google.com/compute/docs/instances/verifying-instance-identity#request_signature
            response = oidc_client.get(
                "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/identity",
                params={"audience": oidc_aud},
                headers={"Metadata-Flavor": "Google"},
            )
            if response.status_code == 200:
                oidc_token = response.text
                oidc_cache.set_cache(key=secret_name, value=oidc_token, ttl=3600 - 60)
                return oidc_token
            else:
                raise ValueError("Google OIDC provider failed")
        elif oidc_provider == "circleci":
            # https://circleci.com/docs/openid-connect-tokens/
            env_secret = os.getenv("CIRCLE_OIDC_TOKEN")
            if env_secret is None:
                raise ValueError("CIRCLE_OIDC_TOKEN not found in environment")
            return env_secret
        elif oidc_provider == "circleci_v2":
            # https://circleci.com/docs/openid-connect-tokens/
            env_secret = os.getenv("CIRCLE_OIDC_TOKEN_V2")
            if env_secret is None:
                raise ValueError("CIRCLE_OIDC_TOKEN_V2 not found in environment")
            return env_secret
        elif oidc_provider == "github":
            # https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/configuring-openid-connect-in-cloud-providers#using-custom-actions
            actions_id_token_request_url = os.getenv("ACTIONS_ID_TOKEN_REQUEST_URL")
            actions_id_token_request_token = os.getenv("ACTIONS_ID_TOKEN_REQUEST_TOKEN")
            if (
                actions_id_token_request_url is None
                or actions_id_token_request_token is None
            ):
                raise ValueError(
                    "ACTIONS_ID_TOKEN_REQUEST_URL or ACTIONS_ID_TOKEN_REQUEST_TOKEN not found in environment"
                )

            oidc_token = oidc_cache.get_cache(key=secret_name)
            if oidc_token is not None:
                return oidc_token

            oidc_client = HTTPHandler(timeout=httpx.Timeout(timeout=600.0, connect=5.0))
            response = oidc_client.get(
                actions_id_token_request_url,
                params={"audience": oidc_aud},
                headers={
                    "Authorization": f"Bearer {actions_id_token_request_token}",
                    "Accept": "application/json; api-version=2.0",
                },
            )
            if response.status_code == 200:
                oidc_token = response.json().get("value", None)
                oidc_cache.set_cache(key=secret_name, value=oidc_token, ttl=300 - 5)
                return oidc_token
            else:
                raise ValueError("Github OIDC provider failed")
        elif oidc_provider == "azure":
            # https://azure.github.io/azure-workload-identity/docs/quick-start.html
            azure_federated_token_file = os.getenv("AZURE_FEDERATED_TOKEN_FILE")
            if azure_federated_token_file is None:
                raise ValueError("AZURE_FEDERATED_TOKEN_FILE not found in environment")
            with open(azure_federated_token_file, "r") as f:
                oidc_token = f.read()
                return oidc_token
        elif oidc_provider == "file":
            # Load token from a file
            with open(oidc_aud, "r") as f:
                oidc_token = f.read()
                return oidc_token
        elif oidc_provider == "env":
            # Load token directly from an environment variable
            oidc_token = os.getenv(oidc_aud)
            if oidc_token is None:
                raise ValueError(f"Environment variable {oidc_aud} not found")
            return oidc_token
        elif oidc_provider == "env_path":
            # Load token from a file path specified in an environment variable
            token_file_path = os.getenv(oidc_aud)
            if token_file_path is None:
                raise ValueError(f"Environment variable {oidc_aud} not found")
            with open(token_file_path, "r") as f:
                oidc_token = f.read()
                return oidc_token
        else:
            raise ValueError("Unsupported OIDC provider")

    try:
        if (
            _should_read_secret_from_secret_manager()
            and litellm.secret_manager_client is not None
        ):
            try:
                client = litellm.secret_manager_client
                key_manager = "local"
                if key_management_system is not None:
                    key_manager = key_management_system.value

                if key_management_settings is not None:
                    if (
                        key_management_settings.hosted_keys is not None
                        and secret_name not in key_management_settings.hosted_keys
                    ):  # allow user to specify which keys to check in hosted key manager
                        key_manager = "local"

                if (
                    key_manager == KeyManagementSystem.AZURE_KEY_VAULT.value
                    or type(client).__module__ + "." + type(client).__name__
                    == "azure.keyvault.secrets._client.SecretClient"
                ):  # support Azure Secret Client - from azure.keyvault.secrets import SecretClient
                    secret = client.get_secret(secret_name).value
                elif (
                    key_manager == KeyManagementSystem.GOOGLE_KMS.value
                    or client.__class__.__name__ == "KeyManagementServiceClient"
                ):
                    encrypted_secret: Any = os.getenv(secret_name)
                    if encrypted_secret is None:
                        raise ValueError(
                            "Google KMS requires the encrypted secret to be in the environment!"
                        )
                    b64_flag = _is_base64(encrypted_secret)
                    if b64_flag is True:  # if passed in as encoded b64 string
                        encrypted_secret = base64.b64decode(encrypted_secret)
                        ciphertext = encrypted_secret
                    else:
                        raise ValueError(
                            "Google KMS requires the encrypted secret to be encoded in base64"
                        )  # fix for this vulnerability https://huntr.com/bounties/ae623c2f-b64b-4245-9ed4-f13a0a5824ce
                    response = client.decrypt(
                        request={
                            "name": litellm._google_kms_resource_name,
                            "ciphertext": ciphertext,
                        }
                    )
                    secret = response.plaintext.decode(
                        "utf-8"
                    )  # assumes the original value was encoded with utf-8
                elif key_manager == KeyManagementSystem.AWS_KMS.value:
                    """
                    Only check the tokens which start with 'aws_kms/'. This prevents latency impact caused by checking all keys.
                    """
                    encrypted_value = os.getenv(secret_name, None)
                    if encrypted_value is None:
                        raise Exception(
                            "AWS KMS - Encrypted Value of Key={} is None".format(
                                secret_name
                            )
                        )
                    # Decode the base64 encoded ciphertext
                    ciphertext_blob = base64.b64decode(encrypted_value)

                    # Set up the parameters for the decrypt call
                    params = {"CiphertextBlob": ciphertext_blob}
                    # Perform the decryption
                    response = client.decrypt(**params)

                    # Extract and decode the plaintext
                    plaintext = response["Plaintext"]
                    secret = plaintext.decode("utf-8")
                    if isinstance(secret, str):
                        secret = secret.strip()
                elif key_manager == KeyManagementSystem.AWS_SECRET_MANAGER.value:
                    from litellm.secret_managers.aws_secret_manager_v2 import (
                        AWSSecretsManagerV2,
                    )

                    if isinstance(client, AWSSecretsManagerV2):
                        secret = client.sync_read_secret(secret_name=secret_name)
                        print_verbose(f"get_secret_value_response: {secret}")
                elif key_manager == KeyManagementSystem.GOOGLE_SECRET_MANAGER.value:
                    try:
                        secret = client.get_secret_from_google_secret_manager(
                            secret_name
                        )
                        print_verbose(f"secret from google secret manager:  {secret}")
                        if secret is None:
                            raise ValueError(
                                f"No secret found in Google Secret Manager for {secret_name}"
                            )
                    except Exception as e:
                        print_verbose(f"An error occurred - {str(e)}")
                        raise e
                elif key_manager == KeyManagementSystem.HASHICORP_VAULT.value:
                    try:
                        secret = client.sync_read_secret(secret_name=secret_name)
                        if secret is None:
                            raise ValueError(
                                f"No secret found in Hashicorp Secret Manager for {secret_name}"
                            )
                    except Exception as e:
                        print_verbose(f"An error occurred - {str(e)}")
                        raise e
                elif key_manager == "local":
                    secret = os.getenv(secret_name)
                else:  # assume the default is infisicial client
                    secret = client.get_secret(secret_name).secret_value
            except Exception as e:  # check if it's in os.environ
                verbose_logger.error(
                    f"Defaulting to os.environ value for key={secret_name}. An exception occurred - {str(e)}.\n\n{traceback.format_exc()}"
                )
                secret = os.getenv(secret_name)
            try:
                if isinstance(secret, str):
                    secret_value_as_bool = ast.literal_eval(secret)
                    if isinstance(secret_value_as_bool, bool):
                        return secret_value_as_bool
                    else:
                        return secret
            except Exception:
                return secret
        else:
            secret = os.environ.get(secret_name)
            secret_value_as_bool = str_to_bool(secret) if secret is not None else None
            if secret_value_as_bool is not None and isinstance(
                secret_value_as_bool, bool
            ):
                return secret_value_as_bool
            else:
                return secret
    except Exception as e:
        if default_value is not None:
            return default_value
        else:
            raise e


def _should_read_secret_from_secret_manager() -> bool:
    """
    Returns True if the secret manager should be used to read the secret, False otherwise

    - If the secret manager client is not set, return False
    - If the `_key_management_settings` access mode is "read_only" or "read_and_write", return True
    - Otherwise, return False
    """
    if litellm.secret_manager_client is not None:
        if litellm._key_management_settings is not None:
            if (
                litellm._key_management_settings.access_mode == "read_only"
                or litellm._key_management_settings.access_mode == "read_and_write"
            ):
                return True
    return False