"""Azure OpenAI embeddings wrapper."""

from __future__ import annotations

import os
from typing import Callable, Dict, Optional, Union

import openai
from langchain_core.pydantic_v1 import Field, SecretStr, root_validator
from langchain_core.utils import convert_to_secret_str, get_from_dict_or_env

from langchain_openai.embeddings.base import OpenAIEmbeddings


class AzureOpenAIEmbeddings(OpenAIEmbeddings):
    """`Azure OpenAI` Embeddings API.

    To use, you should have the
    environment variable ``AZURE_OPENAI_API_KEY`` set with your API key or pass it
    as a named parameter to the constructor.

    Example:
        .. code-block:: python

            from langchain_openai import AzureOpenAIEmbeddings

            openai = AzureOpenAIEmbeddings(model="text-embedding-3-large")
    """

    azure_endpoint: Union[str, None] = None
    """Your Azure endpoint, including the resource.

        Automatically inferred from env var `AZURE_OPENAI_ENDPOINT` if not provided.

        Example: `https://example-resource.azure.openai.com/`
    """
    deployment: Optional[str] = Field(default=None, alias="azure_deployment")
    """A model deployment.

        If given sets the base client URL to include `/deployments/{azure_deployment}`.
        Note: this means you won't be able to use non-deployment endpoints.
    """
    openai_api_key: Optional[SecretStr] = Field(default=None, alias="api_key")
    """Automatically inferred from env var `AZURE_OPENAI_API_KEY` if not provided."""
    azure_ad_token: Optional[SecretStr] = None
    """Your Azure Active Directory token.

        Automatically inferred from env var `AZURE_OPENAI_AD_TOKEN` if not provided.

        For more:
        https://www.microsoft.com/en-us/security/business/identity-access/microsoft-entra-id.
    """
    azure_ad_token_provider: Union[Callable[[], str], None] = None
    """A function that returns an Azure Active Directory token.

        Will be invoked on every request.
    """
    openai_api_version: Optional[str] = Field(default=None, alias="api_version")
    """Automatically inferred from env var `OPENAI_API_VERSION` if not provided."""
    validate_base_url: bool = True
    chunk_size: int = 2048
    """Maximum number of texts to embed in each batch"""

    @root_validator()
    def validate_environment(cls, values: Dict) -> Dict:
        """Validate that api key and python package exists in environment."""
        # Check OPENAI_KEY for backwards compatibility.
        # TODO: Remove OPENAI_API_KEY support to avoid possible conflict when using
        # other forms of azure credentials.
        openai_api_key = (
            values["openai_api_key"]
            or os.getenv("AZURE_OPENAI_API_KEY")
            or os.getenv("OPENAI_API_KEY")
        )
        values["openai_api_key"] = (
            convert_to_secret_str(openai_api_key) if openai_api_key else None
        )
        values["openai_api_base"] = (
            values["openai_api_base"]
            if "openai_api_base" in values
            else os.getenv("OPENAI_API_BASE")
        )
        values["openai_api_version"] = values["openai_api_version"] or os.getenv(
            "OPENAI_API_VERSION", default="2023-05-15"
        )
        values["openai_api_type"] = get_from_dict_or_env(
            values, "openai_api_type", "OPENAI_API_TYPE", default="azure"
        )
        values["openai_organization"] = (
            values["openai_organization"]
            or os.getenv("OPENAI_ORG_ID")
            or os.getenv("OPENAI_ORGANIZATION")
        )
        values["openai_proxy"] = get_from_dict_or_env(
            values, "openai_proxy", "OPENAI_PROXY", default=""
        )
        values["azure_endpoint"] = values["azure_endpoint"] or os.getenv(
            "AZURE_OPENAI_ENDPOINT"
        )
        azure_ad_token = values["azure_ad_token"] or os.getenv("AZURE_OPENAI_AD_TOKEN")
        values["azure_ad_token"] = (
            convert_to_secret_str(azure_ad_token) if azure_ad_token else None
        )
        # For backwards compatibility. Before openai v1, no distinction was made
        # between azure_endpoint and base_url (openai_api_base).
        openai_api_base = values["openai_api_base"]
        if openai_api_base and values["validate_base_url"]:
            if "/openai" not in openai_api_base:
                values["openai_api_base"] += "/openai"
                raise ValueError(
                    "As of openai>=1.0.0, Azure endpoints should be specified via "
                    "the `azure_endpoint` param not `openai_api_base` "
                    "(or alias `base_url`). "
                )
            if values["deployment"]:
                raise ValueError(
                    "As of openai>=1.0.0, if `deployment` (or alias "
                    "`azure_deployment`) is specified then "
                    "`openai_api_base` (or alias `base_url`) should not be. "
                    "Instead use `deployment` (or alias `azure_deployment`) "
                    "and `azure_endpoint`."
                )
        client_params = {
            "api_version": values["openai_api_version"],
            "azure_endpoint": values["azure_endpoint"],
            "azure_deployment": values["deployment"],
            "api_key": (
                values["openai_api_key"].get_secret_value()
                if values["openai_api_key"]
                else None
            ),
            "azure_ad_token": (
                values["azure_ad_token"].get_secret_value()
                if values["azure_ad_token"]
                else None
            ),
            "azure_ad_token_provider": values["azure_ad_token_provider"],
            "organization": values["openai_organization"],
            "base_url": values["openai_api_base"],
            "timeout": values["request_timeout"],
            "max_retries": values["max_retries"],
            "default_headers": values["default_headers"],
            "default_query": values["default_query"],
        }
        if not values.get("client"):
            sync_specific = {"http_client": values["http_client"]}
            values["client"] = openai.AzureOpenAI(
                **client_params, **sync_specific
            ).embeddings
        if not values.get("async_client"):
            async_specific = {"http_client": values["http_async_client"]}
            values["async_client"] = openai.AsyncAzureOpenAI(
                **client_params, **async_specific
            ).embeddings
        return values

    @property
    def _llm_type(self) -> str:
        return "azure-openai-chat"
