# 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.


from typing import Any, AsyncGenerator, List, Optional, Union

import httpx
from ollama import AsyncClient

from llama_stack.apis.common.content_types import (
    ImageContentItem,
    InterleavedContent,
    InterleavedContentItem,
    TextContentItem,
)
from llama_stack.apis.inference import (
    ChatCompletionRequest,
    ChatCompletionResponse,
    ChatCompletionResponseStreamChunk,
    CompletionRequest,
    CompletionResponse,
    CompletionResponseStreamChunk,
    EmbeddingsResponse,
    EmbeddingTaskType,
    GrammarResponseFormat,
    Inference,
    JsonSchemaResponseFormat,
    LogProbConfig,
    Message,
    ResponseFormat,
    SamplingParams,
    TextTruncation,
    ToolChoice,
    ToolConfig,
    ToolDefinition,
    ToolPromptFormat,
)
from llama_stack.apis.models import Model, ModelType
from llama_stack.log import get_logger
from llama_stack.providers.datatypes import ModelsProtocolPrivate
from llama_stack.providers.utils.inference.model_registry import (
    ModelRegistryHelper,
)
from llama_stack.providers.utils.inference.openai_compat import (
    OpenAICompatCompletionChoice,
    OpenAICompatCompletionResponse,
    get_sampling_options,
    process_chat_completion_response,
    process_chat_completion_stream_response,
    process_completion_response,
    process_completion_stream_response,
)
from llama_stack.providers.utils.inference.prompt_adapter import (
    chat_completion_request_to_prompt,
    completion_request_to_prompt,
    content_has_media,
    convert_image_content_to_url,
    interleaved_content_as_str,
    request_has_media,
)

from .models import model_entries

logger = get_logger(name=__name__, category="inference")


class OllamaInferenceAdapter(Inference, ModelsProtocolPrivate):
    def __init__(self, url: str) -> None:
        self.register_helper = ModelRegistryHelper(model_entries)
        self.url = url

    @property
    def client(self) -> AsyncClient:
        return AsyncClient(host=self.url)

    async def initialize(self) -> None:
        logger.info(f"checking connectivity to Ollama at `{self.url}`...")
        try:
            await self.client.ps()
        except httpx.ConnectError as e:
            raise RuntimeError(
                "Ollama Server is not running, start it using `ollama serve` in a separate terminal"
            ) from e

    async def shutdown(self) -> None:
        pass

    async def unregister_model(self, model_id: str) -> None:
        pass

    async def _get_model(self, model_id: str) -> Model:
        if not self.model_store:
            raise ValueError("Model store not set")
        return await self.model_store.get_model(model_id)

    async def completion(
        self,
        model_id: str,
        content: InterleavedContent,
        sampling_params: Optional[SamplingParams] = None,
        response_format: Optional[ResponseFormat] = None,
        stream: Optional[bool] = False,
        logprobs: Optional[LogProbConfig] = None,
    ) -> CompletionResponse | AsyncGenerator[CompletionResponseStreamChunk, None]:
        if sampling_params is None:
            sampling_params = SamplingParams()
        model = await self._get_model(model_id)
        request = CompletionRequest(
            model=model.provider_resource_id,
            content=content,
            sampling_params=sampling_params,
            response_format=response_format,
            stream=stream,
            logprobs=logprobs,
        )
        if stream:
            return self._stream_completion(request)
        else:
            return await self._nonstream_completion(request)

    async def _stream_completion(
        self, request: CompletionRequest
    ) -> AsyncGenerator[CompletionResponseStreamChunk, None]:
        params = await self._get_params(request)

        async def _generate_and_convert_to_openai_compat():
            s = await self.client.generate(**params)
            async for chunk in s:
                choice = OpenAICompatCompletionChoice(
                    finish_reason=chunk["done_reason"] if chunk["done"] else None,
                    text=chunk["response"],
                )
                yield OpenAICompatCompletionResponse(
                    choices=[choice],
                )

        stream = _generate_and_convert_to_openai_compat()
        async for chunk in process_completion_stream_response(stream):
            yield chunk

    async def _nonstream_completion(self, request: CompletionRequest) -> CompletionResponse:
        params = await self._get_params(request)
        r = await self.client.generate(**params)

        choice = OpenAICompatCompletionChoice(
            finish_reason=r["done_reason"] if r["done"] else None,
            text=r["response"],
        )
        response = OpenAICompatCompletionResponse(
            choices=[choice],
        )

        return process_completion_response(response)

    async def chat_completion(
        self,
        model_id: str,
        messages: List[Message],
        sampling_params: Optional[SamplingParams] = None,
        tools: Optional[List[ToolDefinition]] = None,
        tool_choice: Optional[ToolChoice] = ToolChoice.auto,
        tool_prompt_format: Optional[ToolPromptFormat] = None,
        response_format: Optional[ResponseFormat] = None,
        stream: Optional[bool] = False,
        logprobs: Optional[LogProbConfig] = None,
        tool_config: Optional[ToolConfig] = None,
    ) -> ChatCompletionResponse | AsyncGenerator[ChatCompletionResponseStreamChunk, None]:
        if sampling_params is None:
            sampling_params = SamplingParams()
        model = await self._get_model(model_id)
        request = ChatCompletionRequest(
            model=model.provider_resource_id,
            messages=messages,
            sampling_params=sampling_params,
            tools=tools or [],
            stream=stream,
            logprobs=logprobs,
            response_format=response_format,
            tool_config=tool_config,
        )
        if stream:
            return self._stream_chat_completion(request)
        else:
            return await self._nonstream_chat_completion(request)

    async def _get_params(self, request: Union[ChatCompletionRequest, CompletionRequest]) -> dict:
        sampling_options = get_sampling_options(request.sampling_params)
        # This is needed since the Ollama API expects num_predict to be set
        # for early truncation instead of max_tokens.
        if sampling_options.get("max_tokens") is not None:
            sampling_options["num_predict"] = sampling_options["max_tokens"]

        input_dict: dict[str, Any] = {}
        media_present = request_has_media(request)
        llama_model = self.register_helper.get_llama_model(request.model)
        if isinstance(request, ChatCompletionRequest):
            if media_present or not llama_model:
                contents = [await convert_message_to_openai_dict_for_ollama(m) for m in request.messages]
                # flatten the list of lists
                input_dict["messages"] = [item for sublist in contents for item in sublist]
            else:
                input_dict["raw"] = True
                input_dict["prompt"] = await chat_completion_request_to_prompt(
                    request,
                    llama_model,
                )
        else:
            assert not media_present, "Ollama does not support media for Completion requests"
            input_dict["prompt"] = await completion_request_to_prompt(request)
            input_dict["raw"] = True

        if fmt := request.response_format:
            if isinstance(fmt, JsonSchemaResponseFormat):
                input_dict["format"] = fmt.json_schema
            elif isinstance(fmt, GrammarResponseFormat):
                raise NotImplementedError("Grammar response format is not supported")
            else:
                raise ValueError(f"Unknown response format type: {fmt.type}")

        params = {
            "model": request.model,
            **input_dict,
            "options": sampling_options,
            "stream": request.stream,
        }
        logger.debug(f"params to ollama: {params}")

        return params

    async def _nonstream_chat_completion(self, request: ChatCompletionRequest) -> ChatCompletionResponse:
        params = await self._get_params(request)
        if "messages" in params:
            r = await self.client.chat(**params)
        else:
            r = await self.client.generate(**params)

        if "message" in r:
            choice = OpenAICompatCompletionChoice(
                finish_reason=r["done_reason"] if r["done"] else None,
                text=r["message"]["content"],
            )
        else:
            choice = OpenAICompatCompletionChoice(
                finish_reason=r["done_reason"] if r["done"] else None,
                text=r["response"],
            )
        response = OpenAICompatCompletionResponse(
            choices=[choice],
        )
        return process_chat_completion_response(response, request)

    async def _stream_chat_completion(
        self, request: ChatCompletionRequest
    ) -> AsyncGenerator[ChatCompletionResponseStreamChunk, None]:
        params = await self._get_params(request)

        async def _generate_and_convert_to_openai_compat():
            if "messages" in params:
                s = await self.client.chat(**params)
            else:
                s = await self.client.generate(**params)
            async for chunk in s:
                if "message" in chunk:
                    choice = OpenAICompatCompletionChoice(
                        finish_reason=chunk["done_reason"] if chunk["done"] else None,
                        text=chunk["message"]["content"],
                    )
                else:
                    choice = OpenAICompatCompletionChoice(
                        finish_reason=chunk["done_reason"] if chunk["done"] else None,
                        text=chunk["response"],
                    )
                yield OpenAICompatCompletionResponse(
                    choices=[choice],
                )

        stream = _generate_and_convert_to_openai_compat()
        async for chunk in process_chat_completion_stream_response(stream, request):
            yield chunk

    async def embeddings(
        self,
        model_id: str,
        contents: List[str] | List[InterleavedContentItem],
        text_truncation: Optional[TextTruncation] = TextTruncation.none,
        output_dimension: Optional[int] = None,
        task_type: Optional[EmbeddingTaskType] = None,
    ) -> EmbeddingsResponse:
        model = await self._get_model(model_id)

        assert all(not content_has_media(content) for content in contents), (
            "Ollama does not support media for embeddings"
        )
        response = await self.client.embed(
            model=model.provider_resource_id,
            input=[interleaved_content_as_str(content) for content in contents],
        )
        embeddings = response["embeddings"]

        return EmbeddingsResponse(embeddings=embeddings)

    async def register_model(self, model: Model) -> Model:
        model = await self.register_helper.register_model(model)
        if model.model_type == ModelType.embedding:
            logger.info(f"Pulling embedding model `{model.provider_resource_id}` if necessary...")
            await self.client.pull(model.provider_resource_id)
        # we use list() here instead of ps() -
        #  - ps() only lists running models, not available models
        #  - models not currently running are run by the ollama server as needed
        response = await self.client.list()
        available_models = [m["model"] for m in response["models"]]
        if model.provider_resource_id not in available_models:
            raise ValueError(
                f"Model '{model.provider_resource_id}' is not available in Ollama. Available models: {', '.join(available_models)}"
            )

        return model


async def convert_message_to_openai_dict_for_ollama(message: Message) -> List[dict]:
    async def _convert_content(content) -> dict:
        if isinstance(content, ImageContentItem):
            return {
                "role": message.role,
                "images": [await convert_image_content_to_url(content, download=True, include_format=False)],
            }
        else:
            text = content.text if isinstance(content, TextContentItem) else content
            assert isinstance(text, str)
            return {
                "role": message.role,
                "content": text,
            }

    if isinstance(message.content, list):
        return [await _convert_content(c) for c in message.content]
    else:
        return [await _convert_content(message.content)]