# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
#
# This source code is licensed under the terms described in the LICENSE file in
# the root directory of this source tree.

import warnings
from typing import AsyncIterator, List, Optional, Union

from openai import APIConnectionError, AsyncOpenAI

from llama_stack.apis.inference import (
    ChatCompletionRequest,
    ChatCompletionResponse,
    ChatCompletionResponseStreamChunk,
    CompletionRequest,
    CompletionResponse,
    CompletionResponseStreamChunk,
    EmbeddingsResponse,
    Inference,
    InterleavedContent,
    LogProbConfig,
    Message,
    ResponseFormat,
    ToolChoice,
    ToolConfig,
)
from llama_stack.models.llama.datatypes import SamplingParams, ToolDefinition, ToolPromptFormat
from llama_stack.providers.utils.inference.model_registry import (
    ModelRegistryHelper,
)
from llama_stack.providers.utils.inference.prompt_adapter import content_has_media

from . import NVIDIAConfig
from .models import _MODEL_ALIASES
from .openai_utils import (
    convert_chat_completion_request,
    convert_completion_request,
    convert_openai_chat_completion_choice,
    convert_openai_chat_completion_stream,
    convert_openai_completion_choice,
    convert_openai_completion_stream,
)
from .utils import _is_nvidia_hosted, check_health


class NVIDIAInferenceAdapter(Inference, ModelRegistryHelper):
    def __init__(self, config: NVIDIAConfig) -> None:
        # TODO(mf): filter by available models
        ModelRegistryHelper.__init__(self, model_aliases=_MODEL_ALIASES)

        logger.info(f"Initializing NVIDIAInferenceAdapter({config.url})...")

        if _is_nvidia_hosted(config):
            if not config.api_key:
                raise RuntimeError(
                    "API key is required for hosted NVIDIA NIM. Either provide an API key or use a self-hosted NIM."
                )
        # elif self._config.api_key:
        #
        # we don't raise this warning because a user may have deployed their
        # self-hosted NIM with an API key requirement.
        #
        #     warnings.warn(
        #         "API key is not required for self-hosted NVIDIA NIM. "
        #         "Consider removing the api_key from the configuration."
        #     )

        self._config = config
        # make sure the client lives longer than any async calls
        self._client = AsyncOpenAI(
            base_url=f"{self._config.url}/v1",
            api_key=(self._config.api_key.get_secret_value() if self._config.api_key else "NO KEY"),
            timeout=self._config.timeout,
        )

    async def completion(
        self,
        model_id: str,
        content: InterleavedContent,
        sampling_params: Optional[SamplingParams] = SamplingParams(),
        response_format: Optional[ResponseFormat] = None,
        stream: Optional[bool] = False,
        logprobs: Optional[LogProbConfig] = None,
    ) -> Union[CompletionResponse, AsyncIterator[CompletionResponseStreamChunk]]:
        if content_has_media(content):
            raise NotImplementedError("Media is not supported")

        await check_health(self._config)  # this raises errors

        request = convert_completion_request(
            request=CompletionRequest(
                model=self.get_provider_model_id(model_id),
                content=content,
                sampling_params=sampling_params,
                response_format=response_format,
                stream=stream,
                logprobs=logprobs,
            ),
            n=1,
        )

        try:
            response = await self._client.completions.create(**request)
        except APIConnectionError as e:
            raise ConnectionError(f"Failed to connect to NVIDIA NIM at {self._config.url}: {e}") from e

        if stream:
            return convert_openai_completion_stream(response)
        else:
            # we pass n=1 to get only one completion
            return convert_openai_completion_choice(response.choices[0])

    async def embeddings(
        self,
        model_id: str,
        contents: List[InterleavedContent],
    ) -> EmbeddingsResponse:
        raise NotImplementedError()

    async def chat_completion(
        self,
        model_id: str,
        messages: List[Message],
        sampling_params: Optional[SamplingParams] = SamplingParams(),
        response_format: Optional[ResponseFormat] = None,
        tools: Optional[List[ToolDefinition]] = None,
        tool_choice: Optional[ToolChoice] = ToolChoice.auto,
        tool_prompt_format: Optional[ToolPromptFormat] = None,
        stream: Optional[bool] = False,
        logprobs: Optional[LogProbConfig] = None,
        tool_config: Optional[ToolConfig] = None,
    ) -> Union[ChatCompletionResponse, AsyncIterator[ChatCompletionResponseStreamChunk]]:
        if tool_prompt_format:
            warnings.warn("tool_prompt_format is not supported by NVIDIA NIM, ignoring")

        await check_health(self._config)  # this raises errors

        request = await convert_chat_completion_request(
            request=ChatCompletionRequest(
                model=self.get_provider_model_id(model_id),
                messages=messages,
                sampling_params=sampling_params,
                response_format=response_format,
                tools=tools,
                stream=stream,
                logprobs=logprobs,
                tool_config=tool_config,
            ),
            n=1,
        )

        try:
            response = await self._client.chat.completions.create(**request)
        except APIConnectionError as e:
            raise ConnectionError(f"Failed to connect to NVIDIA NIM at {self._config.url}: {e}") from e

        if stream:
            return convert_openai_chat_completion_stream(response)
        else:
            # we pass n=1 to get only one completion
            return convert_openai_chat_completion_choice(response.choices[0])