import warnings
from datetime import datetime
from typing import List, Literal, Optional

import aiohttp
import requests
from pydantic import BaseModel, Field, model_validator

from letta.constants import DEFAULT_EMBEDDING_CHUNK_SIZE, LETTA_MODEL_ENDPOINT, LLM_MAX_TOKENS, MIN_CONTEXT_WINDOW
from letta.llm_api.azure_openai import get_azure_chat_completions_endpoint, get_azure_embeddings_endpoint
from letta.llm_api.azure_openai_constants import AZURE_MODEL_TO_CONTEXT_LENGTH
from letta.schemas.embedding_config import EmbeddingConfig
from letta.schemas.embedding_config_overrides import EMBEDDING_HANDLE_OVERRIDES
from letta.schemas.enums import ProviderCategory, ProviderType
from letta.schemas.letta_base import LettaBase
from letta.schemas.llm_config import LLMConfig
from letta.schemas.llm_config_overrides import LLM_HANDLE_OVERRIDES
from letta.settings import model_settings


class ProviderBase(LettaBase):
    __id_prefix__ = "provider"


class Provider(ProviderBase):
    id: Optional[str] = Field(None, description="The id of the provider, lazily created by the database manager.")
    name: str = Field(..., description="The name of the provider")
    provider_type: ProviderType = Field(..., description="The type of the provider")
    provider_category: ProviderCategory = Field(..., description="The category of the provider (base or byok)")
    api_key: Optional[str] = Field(None, description="API key or secret key used for requests to the provider.")
    base_url: Optional[str] = Field(None, description="Base URL for the provider.")
    access_key: Optional[str] = Field(None, description="Access key used for requests to the provider.")
    region: Optional[str] = Field(None, description="Region used for requests to the provider.")
    organization_id: Optional[str] = Field(None, description="The organization id of the user")
    updated_at: Optional[datetime] = Field(None, description="The last update timestamp of the provider.")

    @model_validator(mode="after")
    def default_base_url(self):
        if self.provider_type == ProviderType.openai and self.base_url is None:
            self.base_url = model_settings.openai_api_base
        return self

    def resolve_identifier(self):
        if not self.id:
            self.id = ProviderBase.generate_id(prefix=ProviderBase.__id_prefix__)

    def check_api_key(self):
        """Check if the API key is valid for the provider"""
        raise NotImplementedError

    def list_llm_models(self) -> List[LLMConfig]:
        return []

    async def list_llm_models_async(self) -> List[LLMConfig]:
        return []

    def list_embedding_models(self) -> List[EmbeddingConfig]:
        return []

    async def list_embedding_models_async(self) -> List[EmbeddingConfig]:
        return self.list_embedding_models()

    def get_model_context_window(self, model_name: str) -> Optional[int]:
        raise NotImplementedError

    async def get_model_context_window_async(self, model_name: str) -> Optional[int]:
        raise NotImplementedError

    def provider_tag(self) -> str:
        """String representation of the provider for display purposes"""
        raise NotImplementedError

    def get_handle(self, model_name: str, is_embedding: bool = False, base_name: Optional[str] = None) -> str:
        """
        Get the handle for a model, with support for custom overrides.

        Args:
            model_name (str): The name of the model.
            is_embedding (bool, optional): Whether the handle is for an embedding model. Defaults to False.

        Returns:
            str: The handle for the model.
        """
        base_name = base_name if base_name else self.name

        overrides = EMBEDDING_HANDLE_OVERRIDES if is_embedding else LLM_HANDLE_OVERRIDES
        if base_name in overrides and model_name in overrides[base_name]:
            model_name = overrides[base_name][model_name]

        return f"{base_name}/{model_name}"

    def cast_to_subtype(self):
        match self.provider_type:
            case ProviderType.letta:
                return LettaProvider(**self.model_dump(exclude_none=True))
            case ProviderType.openai:
                return OpenAIProvider(**self.model_dump(exclude_none=True))
            case ProviderType.anthropic:
                return AnthropicProvider(**self.model_dump(exclude_none=True))
            case ProviderType.bedrock:
                return BedrockProvider(**self.model_dump(exclude_none=True))
            case ProviderType.ollama:
                return OllamaProvider(**self.model_dump(exclude_none=True))
            case ProviderType.google_ai:
                return GoogleAIProvider(**self.model_dump(exclude_none=True))
            case ProviderType.google_vertex:
                return GoogleVertexProvider(**self.model_dump(exclude_none=True))
            case ProviderType.azure:
                return AzureProvider(**self.model_dump(exclude_none=True))
            case ProviderType.groq:
                return GroqProvider(**self.model_dump(exclude_none=True))
            case ProviderType.together:
                return TogetherProvider(**self.model_dump(exclude_none=True))
            case ProviderType.vllm_chat_completions:
                return VLLMChatCompletionsProvider(**self.model_dump(exclude_none=True))
            case ProviderType.vllm_completions:
                return VLLMCompletionsProvider(**self.model_dump(exclude_none=True))
            case ProviderType.xai:
                return XAIProvider(**self.model_dump(exclude_none=True))
            case _:
                raise ValueError(f"Unknown provider type: {self.provider_type}")


class ProviderCreate(ProviderBase):
    name: str = Field(..., description="The name of the provider.")
    provider_type: ProviderType = Field(..., description="The type of the provider.")
    api_key: str = Field(..., description="API key or secret key used for requests to the provider.")
    access_key: Optional[str] = Field(None, description="Access key used for requests to the provider.")
    region: Optional[str] = Field(None, description="Region used for requests to the provider.")


class ProviderUpdate(ProviderBase):
    api_key: str = Field(..., description="API key or secret key used for requests to the provider.")
    access_key: Optional[str] = Field(None, description="Access key used for requests to the provider.")
    region: Optional[str] = Field(None, description="Region used for requests to the provider.")


class ProviderCheck(BaseModel):
    provider_type: ProviderType = Field(..., description="The type of the provider.")
    api_key: str = Field(..., description="API key or secret key used for requests to the provider.")
    access_key: Optional[str] = Field(None, description="Access key used for requests to the provider.")
    region: Optional[str] = Field(None, description="Region used for requests to the provider.")


class LettaProvider(Provider):
    provider_type: Literal[ProviderType.letta] = Field(ProviderType.letta, description="The type of the provider.")
    provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")

    def list_llm_models(self) -> List[LLMConfig]:
        return [
            LLMConfig(
                model="letta-free",  # NOTE: renamed
                model_endpoint_type="openai",
                model_endpoint=LETTA_MODEL_ENDPOINT,
                context_window=30000,
                handle=self.get_handle("letta-free"),
                provider_name=self.name,
                provider_category=self.provider_category,
            )
        ]

    async def list_llm_models_async(self) -> List[LLMConfig]:
        return [
            LLMConfig(
                model="letta-free",  # NOTE: renamed
                model_endpoint_type="openai",
                model_endpoint=LETTA_MODEL_ENDPOINT,
                context_window=30000,
                handle=self.get_handle("letta-free"),
                provider_name=self.name,
                provider_category=self.provider_category,
            )
        ]

    def list_embedding_models(self):
        return [
            EmbeddingConfig(
                embedding_model="letta-free",  # NOTE: renamed
                embedding_endpoint_type="hugging-face",
                embedding_endpoint="https://embeddings.memgpt.ai",
                embedding_dim=1024,
                embedding_chunk_size=300,
                handle=self.get_handle("letta-free", is_embedding=True),
                batch_size=32,
            )
        ]


class OpenAIProvider(Provider):
    provider_type: Literal[ProviderType.openai] = Field(ProviderType.openai, description="The type of the provider.")
    provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")
    api_key: str = Field(..., description="API key for the OpenAI API.")
    base_url: str = Field(..., description="Base URL for the OpenAI API.")

    def check_api_key(self):
        from letta.llm_api.openai import openai_check_valid_api_key

        openai_check_valid_api_key(self.base_url, self.api_key)

    def _get_models(self) -> List[dict]:
        from letta.llm_api.openai import openai_get_model_list

        # Some hardcoded support for OpenRouter (so that we only get models with tool calling support)...
        # See: https://openrouter.ai/docs/requests
        extra_params = {"supported_parameters": "tools"} if "openrouter.ai" in self.base_url else None

        # Similar to Nebius
        extra_params = {"verbose": True} if "nebius.com" in self.base_url else None

        response = openai_get_model_list(
            self.base_url,
            api_key=self.api_key,
            extra_params=extra_params,
            # fix_url=True,  # NOTE: make sure together ends with /v1
        )

        if "data" in response:
            data = response["data"]
        else:
            # TogetherAI's response is missing the 'data' field
            data = response

        return data

    async def _get_models_async(self) -> List[dict]:
        from letta.llm_api.openai import openai_get_model_list_async

        # Some hardcoded support for OpenRouter (so that we only get models with tool calling support)...
        # See: https://openrouter.ai/docs/requests
        extra_params = {"supported_parameters": "tools"} if "openrouter.ai" in self.base_url else None

        # Similar to Nebius
        extra_params = {"verbose": True} if "nebius.com" in self.base_url else None

        response = await openai_get_model_list_async(
            self.base_url,
            api_key=self.api_key,
            extra_params=extra_params,
            # fix_url=True,  # NOTE: make sure together ends with /v1
        )

        if "data" in response:
            data = response["data"]
        else:
            # TogetherAI's response is missing the 'data' field
            data = response

        return data

    def list_llm_models(self) -> List[LLMConfig]:
        data = self._get_models()
        return self._list_llm_models(data)

    async def list_llm_models_async(self) -> List[LLMConfig]:
        data = await self._get_models_async()
        return self._list_llm_models(data)

    def _list_llm_models(self, data) -> List[LLMConfig]:
        configs = []
        for model in data:
            assert "id" in model, f"OpenAI model missing 'id' field: {model}"
            model_name = model["id"]

            if "context_length" in model:
                # Context length is returned in OpenRouter as "context_length"
                context_window_size = model["context_length"]
            else:
                context_window_size = self.get_model_context_window_size(model_name)

            if not context_window_size:
                continue

            # TogetherAI includes the type, which we can use to filter out embedding models
            if "api.together.ai" in self.base_url or "api.together.xyz" in self.base_url:
                if "type" in model and model["type"] not in ["chat", "language"]:
                    continue

                # for TogetherAI, we need to skip the models that don't support JSON mode / function calling
                # requests.exceptions.HTTPError: HTTP error occurred: 400 Client Error: Bad Request for url: https://api.together.ai/v1/chat/completions | Status code: 400, Message: {
                #   "error": {
                #     "message": "mistralai/Mixtral-8x7B-v0.1 is not supported for JSON mode/function calling",
                #     "type": "invalid_request_error",
                #     "param": null,
                #     "code": "constraints_model"
                #   }
                # }
                if "config" not in model:
                    continue

            if "nebius.com" in self.base_url:
                # Nebius includes the type, which we can use to filter for text models
                try:
                    model_type = model["architecture"]["modality"]
                    if model_type not in ["text->text", "text+image->text"]:
                        # print(f"Skipping model w/ modality {model_type}:\n{model}")
                        continue
                except KeyError:
                    print(f"Couldn't access architecture type field, skipping model:\n{model}")
                    continue

            # for openai, filter models
            if self.base_url == "https://api.openai.com/v1":
                allowed_types = ["gpt-4", "o1", "o3", "o4"]
                # NOTE: o1-mini and o1-preview do not support tool calling
                # NOTE: o1-mini does not support system messages
                # NOTE: o1-pro is only available in Responses API
                disallowed_types = ["transcribe", "search", "realtime", "tts", "audio", "computer", "o1-mini", "o1-preview", "o1-pro"]
                skip = True
                for model_type in allowed_types:
                    if model_name.startswith(model_type):
                        skip = False
                        break
                for keyword in disallowed_types:
                    if keyword in model_name:
                        skip = True
                        break
                # ignore this model
                if skip:
                    continue

            # set the handle to openai-proxy if the base URL isn't OpenAI
            if self.base_url != "https://api.openai.com/v1":
                handle = self.get_handle(model_name, base_name="openai-proxy")
            else:
                handle = self.get_handle(model_name)

            llm_config = LLMConfig(
                model=model_name,
                model_endpoint_type="openai",
                model_endpoint=self.base_url,
                context_window=context_window_size,
                handle=handle,
                provider_name=self.name,
                provider_category=self.provider_category,
            )

            # gpt-4o-mini has started to regress with pretty bad emoji spam loops
            # this is to counteract that
            if "gpt-4o-mini" in model_name:
                llm_config.frequency_penalty = 1.0
            if "gpt-4.1-mini" in model_name:
                llm_config.frequency_penalty = 1.0

            configs.append(llm_config)

        # for OpenAI, sort in reverse order
        if self.base_url == "https://api.openai.com/v1":
            # alphnumeric sort
            configs.sort(key=lambda x: x.model, reverse=True)

        return configs

    def list_embedding_models(self) -> List[EmbeddingConfig]:
        if self.base_url == "https://api.openai.com/v1":
            # TODO: actually automatically list models for OpenAI
            return [
                EmbeddingConfig(
                    embedding_model="text-embedding-ada-002",
                    embedding_endpoint_type="openai",
                    embedding_endpoint=self.base_url,
                    embedding_dim=1536,
                    embedding_chunk_size=300,
                    handle=self.get_handle("text-embedding-ada-002", is_embedding=True),
                    batch_size=1024,
                ),
                EmbeddingConfig(
                    embedding_model="text-embedding-3-small",
                    embedding_endpoint_type="openai",
                    embedding_endpoint=self.base_url,
                    embedding_dim=2000,
                    embedding_chunk_size=300,
                    handle=self.get_handle("text-embedding-3-small", is_embedding=True),
                    batch_size=1024,
                ),
                EmbeddingConfig(
                    embedding_model="text-embedding-3-large",
                    embedding_endpoint_type="openai",
                    embedding_endpoint=self.base_url,
                    embedding_dim=2000,
                    embedding_chunk_size=300,
                    handle=self.get_handle("text-embedding-3-large", is_embedding=True),
                    batch_size=1024,
                ),
            ]

        else:
            # Actually attempt to list
            data = self._get_models()
            return self._list_embedding_models(data)

    async def list_embedding_models_async(self) -> List[EmbeddingConfig]:
        if self.base_url == "https://api.openai.com/v1":
            # TODO: actually automatically list models for OpenAI
            return [
                EmbeddingConfig(
                    embedding_model="text-embedding-ada-002",
                    embedding_endpoint_type="openai",
                    embedding_endpoint=self.base_url,
                    embedding_dim=1536,
                    embedding_chunk_size=300,
                    handle=self.get_handle("text-embedding-ada-002", is_embedding=True),
                    batch_size=1024,
                ),
                EmbeddingConfig(
                    embedding_model="text-embedding-3-small",
                    embedding_endpoint_type="openai",
                    embedding_endpoint=self.base_url,
                    embedding_dim=2000,
                    embedding_chunk_size=300,
                    handle=self.get_handle("text-embedding-3-small", is_embedding=True),
                    batch_size=1024,
                ),
                EmbeddingConfig(
                    embedding_model="text-embedding-3-large",
                    embedding_endpoint_type="openai",
                    embedding_endpoint=self.base_url,
                    embedding_dim=2000,
                    embedding_chunk_size=300,
                    handle=self.get_handle("text-embedding-3-large", is_embedding=True),
                    batch_size=1024,
                ),
            ]

        else:
            # Actually attempt to list
            data = await self._get_models_async()
            return self._list_embedding_models(data)

    def _list_embedding_models(self, data) -> List[EmbeddingConfig]:
        configs = []
        for model in data:
            assert "id" in model, f"Model missing 'id' field: {model}"
            model_name = model["id"]

            if "context_length" in model:
                # Context length is returned in Nebius as "context_length"
                context_window_size = model["context_length"]
            else:
                context_window_size = self.get_model_context_window_size(model_name)

            # We need the context length for embeddings too
            if not context_window_size:
                continue

            if "nebius.com" in self.base_url:
                # Nebius includes the type, which we can use to filter for embedidng models
                try:
                    model_type = model["architecture"]["modality"]
                    if model_type not in ["text->embedding"]:
                        # print(f"Skipping model w/ modality {model_type}:\n{model}")
                        continue
                except KeyError:
                    print(f"Couldn't access architecture type field, skipping model:\n{model}")
                    continue

            elif "together.ai" in self.base_url or "together.xyz" in self.base_url:
                # TogetherAI includes the type, which we can use to filter for embedding models
                if "type" in model and model["type"] not in ["embedding"]:
                    # print(f"Skipping model w/ modality {model_type}:\n{model}")
                    continue

            else:
                # For other providers we should skip by default, since we don't want to assume embeddings are supported
                continue

            configs.append(
                EmbeddingConfig(
                    embedding_model=model_name,
                    embedding_endpoint_type=self.provider_type,
                    embedding_endpoint=self.base_url,
                    embedding_dim=context_window_size,
                    embedding_chunk_size=DEFAULT_EMBEDDING_CHUNK_SIZE,
                    handle=self.get_handle(model, is_embedding=True),
                )
            )

        return configs

    def get_model_context_window_size(self, model_name: str):
        if model_name in LLM_MAX_TOKENS:
            return LLM_MAX_TOKENS[model_name]
        else:
            return LLM_MAX_TOKENS["DEFAULT"]


class DeepSeekProvider(OpenAIProvider):
    """
    DeepSeek ChatCompletions API is similar to OpenAI's reasoning API,
    but with slight differences:
    * For example, DeepSeek's API requires perfect interleaving of user/assistant
    * It also does not support native function calling
    """

    provider_type: Literal[ProviderType.deepseek] = Field(ProviderType.deepseek, description="The type of the provider.")
    provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")
    base_url: str = Field("https://api.deepseek.com/v1", description="Base URL for the DeepSeek API.")
    api_key: str = Field(..., description="API key for the DeepSeek API.")

    def get_model_context_window_size(self, model_name: str) -> Optional[int]:
        # DeepSeek doesn't return context window in the model listing,
        # so these are hardcoded from their website
        if model_name == "deepseek-reasoner":
            return 64000
        elif model_name == "deepseek-chat":
            return 64000
        else:
            return None

    def list_llm_models(self) -> List[LLMConfig]:
        from letta.llm_api.openai import openai_get_model_list

        response = openai_get_model_list(self.base_url, api_key=self.api_key)

        if "data" in response:
            data = response["data"]
        else:
            data = response

        configs = []
        for model in data:
            assert "id" in model, f"DeepSeek model missing 'id' field: {model}"
            model_name = model["id"]

            # In case DeepSeek starts supporting it in the future:
            if "context_length" in model:
                # Context length is returned in OpenRouter as "context_length"
                context_window_size = model["context_length"]
            else:
                context_window_size = self.get_model_context_window_size(model_name)

            if not context_window_size:
                warnings.warn(f"Couldn't find context window size for model {model_name}")
                continue

            # Not used for deepseek-reasoner, but otherwise is true
            put_inner_thoughts_in_kwargs = False if model_name == "deepseek-reasoner" else True

            configs.append(
                LLMConfig(
                    model=model_name,
                    model_endpoint_type="deepseek",
                    model_endpoint=self.base_url,
                    context_window=context_window_size,
                    handle=self.get_handle(model_name),
                    put_inner_thoughts_in_kwargs=put_inner_thoughts_in_kwargs,
                    provider_name=self.name,
                    provider_category=self.provider_category,
                )
            )

        return configs

    def list_embedding_models(self) -> List[EmbeddingConfig]:
        # No embeddings supported
        return []


class LMStudioOpenAIProvider(OpenAIProvider):
    provider_type: Literal[ProviderType.lmstudio_openai] = Field(ProviderType.lmstudio_openai, description="The type of the provider.")
    provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")
    base_url: str = Field(..., description="Base URL for the LMStudio OpenAI API.")
    api_key: Optional[str] = Field(None, description="API key for the LMStudio API.")

    def list_llm_models(self) -> List[LLMConfig]:
        from letta.llm_api.openai import openai_get_model_list

        # For LMStudio, we want to hit 'GET /api/v0/models' instead of 'GET /v1/models'
        MODEL_ENDPOINT_URL = f"{self.base_url.strip('/v1')}/api/v0"
        response = openai_get_model_list(MODEL_ENDPOINT_URL)

        """
        Example response:

        {
          "object": "list",
          "data": [
            {
              "id": "qwen2-vl-7b-instruct",
              "object": "model",
              "type": "vlm",
              "publisher": "mlx-community",
              "arch": "qwen2_vl",
              "compatibility_type": "mlx",
              "quantization": "4bit",
              "state": "not-loaded",
              "max_context_length": 32768
            },
            ...
        """
        if "data" not in response:
            warnings.warn(f"LMStudio OpenAI model query response missing 'data' field: {response}")
            return []

        configs = []
        for model in response["data"]:
            assert "id" in model, f"Model missing 'id' field: {model}"
            model_name = model["id"]

            if "type" not in model:
                warnings.warn(f"LMStudio OpenAI model missing 'type' field: {model}")
                continue
            elif model["type"] not in ["vlm", "llm"]:
                continue

            if "max_context_length" in model:
                context_window_size = model["max_context_length"]
            else:
                warnings.warn(f"LMStudio OpenAI model missing 'max_context_length' field: {model}")
                continue

            configs.append(
                LLMConfig(
                    model=model_name,
                    model_endpoint_type="openai",
                    model_endpoint=self.base_url,
                    context_window=context_window_size,
                    handle=self.get_handle(model_name),
                )
            )

        return configs

    def list_embedding_models(self) -> List[EmbeddingConfig]:
        from letta.llm_api.openai import openai_get_model_list

        # For LMStudio, we want to hit 'GET /api/v0/models' instead of 'GET /v1/models'
        MODEL_ENDPOINT_URL = f"{self.base_url.strip('/v1')}/api/v0"
        response = openai_get_model_list(MODEL_ENDPOINT_URL)

        """
        Example response:
        {
          "object": "list",
          "data": [
            {
              "id": "text-embedding-nomic-embed-text-v1.5",
              "object": "model",
              "type": "embeddings",
              "publisher": "nomic-ai",
              "arch": "nomic-bert",
              "compatibility_type": "gguf",
              "quantization": "Q4_0",
              "state": "not-loaded",
              "max_context_length": 2048
            }
            ...
        """
        if "data" not in response:
            warnings.warn(f"LMStudio OpenAI model query response missing 'data' field: {response}")
            return []

        configs = []
        for model in response["data"]:
            assert "id" in model, f"Model missing 'id' field: {model}"
            model_name = model["id"]

            if "type" not in model:
                warnings.warn(f"LMStudio OpenAI model missing 'type' field: {model}")
                continue
            elif model["type"] not in ["embeddings"]:
                continue

            if "max_context_length" in model:
                context_window_size = model["max_context_length"]
            else:
                warnings.warn(f"LMStudio OpenAI model missing 'max_context_length' field: {model}")
                continue

            configs.append(
                EmbeddingConfig(
                    embedding_model=model_name,
                    embedding_endpoint_type="openai",
                    embedding_endpoint=self.base_url,
                    embedding_dim=context_window_size,
                    embedding_chunk_size=300,  # NOTE: max is 2048
                    handle=self.get_handle(model_name),
                ),
            )

        return configs


class XAIProvider(OpenAIProvider):
    """https://docs.x.ai/docs/api-reference"""

    provider_type: Literal[ProviderType.xai] = Field(ProviderType.xai, description="The type of the provider.")
    provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")
    api_key: str = Field(..., description="API key for the xAI/Grok API.")
    base_url: str = Field("https://api.x.ai/v1", description="Base URL for the xAI/Grok API.")

    def get_model_context_window_size(self, model_name: str) -> Optional[int]:
        # xAI doesn't return context window in the model listing,
        # so these are hardcoded from their website
        if model_name == "grok-2-1212":
            return 131072
        # NOTE: disabling the minis for now since they return weird MM parts
        # elif model_name == "grok-3-mini-fast-beta":
        #     return 131072
        # elif model_name == "grok-3-mini-beta":
        #     return 131072
        elif model_name == "grok-3-fast-beta":
            return 131072
        elif model_name == "grok-3-beta":
            return 131072
        else:
            return None

    def list_llm_models(self) -> List[LLMConfig]:
        from letta.llm_api.openai import openai_get_model_list

        response = openai_get_model_list(self.base_url, api_key=self.api_key)

        if "data" in response:
            data = response["data"]
        else:
            data = response

        configs = []
        for model in data:
            assert "id" in model, f"xAI/Grok model missing 'id' field: {model}"
            model_name = model["id"]

            # In case xAI starts supporting it in the future:
            if "context_length" in model:
                context_window_size = model["context_length"]
            else:
                context_window_size = self.get_model_context_window_size(model_name)

            if not context_window_size:
                warnings.warn(f"Couldn't find context window size for model {model_name}")
                continue

            configs.append(
                LLMConfig(
                    model=model_name,
                    model_endpoint_type="xai",
                    model_endpoint=self.base_url,
                    context_window=context_window_size,
                    handle=self.get_handle(model_name),
                    provider_name=self.name,
                    provider_category=self.provider_category,
                )
            )

        return configs

    def list_embedding_models(self) -> List[EmbeddingConfig]:
        # No embeddings supported
        return []


class AnthropicProvider(Provider):
    provider_type: Literal[ProviderType.anthropic] = Field(ProviderType.anthropic, description="The type of the provider.")
    provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")
    api_key: str = Field(..., description="API key for the Anthropic API.")
    base_url: str = "https://api.anthropic.com/v1"

    def check_api_key(self):
        from letta.llm_api.anthropic import anthropic_check_valid_api_key

        anthropic_check_valid_api_key(self.api_key)

    def list_llm_models(self) -> List[LLMConfig]:
        from letta.llm_api.anthropic import anthropic_get_model_list

        models = anthropic_get_model_list(api_key=self.api_key)
        return self._list_llm_models(models)

    async def list_llm_models_async(self) -> List[LLMConfig]:
        from letta.llm_api.anthropic import anthropic_get_model_list_async

        models = await anthropic_get_model_list_async(api_key=self.api_key)
        return self._list_llm_models(models)

    def _list_llm_models(self, models) -> List[LLMConfig]:
        from letta.llm_api.anthropic import MODEL_LIST

        configs = []
        for model in models:
            if model["type"] != "model":
                continue

            if "id" not in model:
                continue

            # Don't support 2.0 and 2.1
            if model["id"].startswith("claude-2"):
                continue

            # Anthropic doesn't return the context window in their API
            if "context_window" not in model:
                # Remap list to name: context_window
                model_library = {m["name"]: m["context_window"] for m in MODEL_LIST}
                # Attempt to look it up in a hardcoded list
                if model["id"] in model_library:
                    model["context_window"] = model_library[model["id"]]
                else:
                    # On fallback, we can set 200k (generally safe), but we should warn the user
                    warnings.warn(f"Couldn't find context window size for model {model['id']}, defaulting to 200,000")
                    model["context_window"] = 200000

            max_tokens = 8192
            if "claude-3-opus" in model["id"]:
                max_tokens = 4096
            if "claude-3-haiku" in model["id"]:
                max_tokens = 4096
            # TODO: set for 3-7 extended thinking mode

            # We set this to false by default, because Anthropic can
            # natively support <thinking> tags inside of content fields
            # However, putting COT inside of tool calls can make it more
            # reliable for tool calling (no chance of a non-tool call step)
            # Since tool_choice_type 'any' doesn't work with in-content COT
            # NOTE For Haiku, it can be flaky if we don't enable this by default
            # inner_thoughts_in_kwargs = True if "haiku" in model["id"] else False
            inner_thoughts_in_kwargs = True  # we no longer support thinking tags

            configs.append(
                LLMConfig(
                    model=model["id"],
                    model_endpoint_type="anthropic",
                    model_endpoint=self.base_url,
                    context_window=model["context_window"],
                    handle=self.get_handle(model["id"]),
                    put_inner_thoughts_in_kwargs=inner_thoughts_in_kwargs,
                    max_tokens=max_tokens,
                    provider_name=self.name,
                    provider_category=self.provider_category,
                )
            )
        return configs


class MistralProvider(Provider):
    provider_type: Literal[ProviderType.mistral] = Field(ProviderType.mistral, description="The type of the provider.")
    provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")
    api_key: str = Field(..., description="API key for the Mistral API.")
    base_url: str = "https://api.mistral.ai/v1"

    def list_llm_models(self) -> List[LLMConfig]:
        from letta.llm_api.mistral import mistral_get_model_list

        # Some hardcoded support for OpenRouter (so that we only get models with tool calling support)...
        # See: https://openrouter.ai/docs/requests
        response = mistral_get_model_list(self.base_url, api_key=self.api_key)

        assert "data" in response, f"Mistral model query response missing 'data' field: {response}"

        configs = []
        for model in response["data"]:
            # If model has chat completions and function calling enabled
            if model["capabilities"]["completion_chat"] and model["capabilities"]["function_calling"]:
                configs.append(
                    LLMConfig(
                        model=model["id"],
                        model_endpoint_type="openai",
                        model_endpoint=self.base_url,
                        context_window=model["max_context_length"],
                        handle=self.get_handle(model["id"]),
                        provider_name=self.name,
                        provider_category=self.provider_category,
                    )
                )

        return configs

    def list_embedding_models(self) -> List[EmbeddingConfig]:
        # Not supported for mistral
        return []

    def get_model_context_window(self, model_name: str) -> Optional[int]:
        # Redoing this is fine because it's a pretty lightweight call
        models = self.list_llm_models()

        for m in models:
            if model_name in m["id"]:
                return int(m["max_context_length"])

        return None


class OllamaProvider(OpenAIProvider):
    """Ollama provider that uses the native /api/generate endpoint

    See: https://github.com/ollama/ollama/blob/main/docs/api.md#generate-a-completion
    """

    provider_type: Literal[ProviderType.ollama] = Field(ProviderType.ollama, description="The type of the provider.")
    provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")
    base_url: str = Field(..., description="Base URL for the Ollama API.")
    api_key: Optional[str] = Field(None, description="API key for the Ollama API (default: `None`).")
    default_prompt_formatter: str = Field(
        ..., description="Default prompt formatter (aka model wrapper) to use on a /completions style API."
    )

    async def list_llm_models_async(self) -> List[LLMConfig]:
        """Async version of list_llm_models below"""
        endpoint = f"{self.base_url}/api/tags"
        async with aiohttp.ClientSession() as session:
            async with session.get(endpoint) as response:
                if response.status != 200:
                    raise Exception(f"Failed to list Ollama models: {response.text}")
                response_json = await response.json()

        configs = []
        for model in response_json["models"]:
            context_window = self.get_model_context_window(model["name"])
            if context_window is None:
                print(f"Ollama model {model['name']} has no context window")
                continue
            configs.append(
                LLMConfig(
                    model=model["name"],
                    model_endpoint_type="ollama",
                    model_endpoint=self.base_url,
                    model_wrapper=self.default_prompt_formatter,
                    context_window=context_window,
                    handle=self.get_handle(model["name"]),
                    provider_name=self.name,
                    provider_category=self.provider_category,
                )
            )
        return configs

    def list_llm_models(self) -> List[LLMConfig]:
        # https://github.com/ollama/ollama/blob/main/docs/api.md#list-local-models
        response = requests.get(f"{self.base_url}/api/tags")
        if response.status_code != 200:
            raise Exception(f"Failed to list Ollama models: {response.text}")
        response_json = response.json()

        configs = []
        for model in response_json["models"]:
            context_window = self.get_model_context_window(model["name"])
            if context_window is None:
                print(f"Ollama model {model['name']} has no context window")
                continue
            configs.append(
                LLMConfig(
                    model=model["name"],
                    model_endpoint_type="ollama",
                    model_endpoint=self.base_url,
                    model_wrapper=self.default_prompt_formatter,
                    context_window=context_window,
                    handle=self.get_handle(model["name"]),
                    provider_name=self.name,
                    provider_category=self.provider_category,
                )
            )
        return configs

    def get_model_context_window(self, model_name: str) -> Optional[int]:
        response = requests.post(f"{self.base_url}/api/show", json={"name": model_name, "verbose": True})
        response_json = response.json()

        ## thank you vLLM: https://github.com/vllm-project/vllm/blob/main/vllm/config.py#L1675
        # possible_keys = [
        #    # OPT
        #    "max_position_embeddings",
        #    # GPT-2
        #    "n_positions",
        #    # MPT
        #    "max_seq_len",
        #    # ChatGLM2
        #    "seq_length",
        #    # Command-R
        #    "model_max_length",
        #    # Others
        #    "max_sequence_length",
        #    "max_seq_length",
        #    "seq_len",
        # ]
        # max_position_embeddings
        # parse model cards: nous, dolphon, llama
        if "model_info" not in response_json:
            if "error" in response_json:
                print(f"Ollama fetch model info error for {model_name}: {response_json['error']}")
            return None
        for key, value in response_json["model_info"].items():
            if "context_length" in key:
                return value
        return None

    def _get_model_embedding_dim(self, model_name: str):
        response = requests.post(f"{self.base_url}/api/show", json={"name": model_name, "verbose": True})
        response_json = response.json()
        return self._get_model_embedding_dim_impl(response_json, model_name)

    async def _get_model_embedding_dim_async(self, model_name: str):
        async with aiohttp.ClientSession() as session:
            async with session.post(f"{self.base_url}/api/show", json={"name": model_name, "verbose": True}) as response:
                response_json = await response.json()
            return self._get_model_embedding_dim_impl(response_json, model_name)

    @staticmethod
    def _get_model_embedding_dim_impl(response_json: dict, model_name: str):
        if "model_info" not in response_json:
            if "error" in response_json:
                print(f"Ollama fetch model info error for {model_name}: {response_json['error']}")
            return None
        for key, value in response_json["model_info"].items():
            if "embedding_length" in key:
                return value
        return None

    async def list_embedding_models_async(self) -> List[EmbeddingConfig]:
        """Async version of list_embedding_models below"""
        endpoint = f"{self.base_url}/api/tags"
        async with aiohttp.ClientSession() as session:
            async with session.get(endpoint) as response:
                if response.status != 200:
                    raise Exception(f"Failed to list Ollama models: {response.text}")
                response_json = await response.json()

        configs = []
        for model in response_json["models"]:
            embedding_dim = await self._get_model_embedding_dim_async(model["name"])
            if not embedding_dim:
                print(f"Ollama model {model['name']} has no embedding dimension")
                continue
            configs.append(
                EmbeddingConfig(
                    embedding_model=model["name"],
                    embedding_endpoint_type="ollama",
                    embedding_endpoint=self.base_url,
                    embedding_dim=embedding_dim,
                    embedding_chunk_size=300,
                    handle=self.get_handle(model["name"], is_embedding=True),
                )
            )
        return configs

    def list_embedding_models(self) -> List[EmbeddingConfig]:
        # https://github.com/ollama/ollama/blob/main/docs/api.md#list-local-models
        response = requests.get(f"{self.base_url}/api/tags")
        if response.status_code != 200:
            raise Exception(f"Failed to list Ollama models: {response.text}")
        response_json = response.json()

        configs = []
        for model in response_json["models"]:
            embedding_dim = self._get_model_embedding_dim(model["name"])
            if not embedding_dim:
                print(f"Ollama model {model['name']} has no embedding dimension")
                continue
            configs.append(
                EmbeddingConfig(
                    embedding_model=model["name"],
                    embedding_endpoint_type="ollama",
                    embedding_endpoint=self.base_url,
                    embedding_dim=embedding_dim,
                    embedding_chunk_size=300,
                    handle=self.get_handle(model["name"], is_embedding=True),
                )
            )
        return configs


class GroqProvider(OpenAIProvider):
    provider_type: Literal[ProviderType.groq] = Field(ProviderType.groq, description="The type of the provider.")
    provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")
    base_url: str = "https://api.groq.com/openai/v1"
    api_key: str = Field(..., description="API key for the Groq API.")

    def list_llm_models(self) -> List[LLMConfig]:
        from letta.llm_api.openai import openai_get_model_list

        response = openai_get_model_list(self.base_url, api_key=self.api_key)
        configs = []
        for model in response["data"]:
            if "context_window" not in model:
                continue
            configs.append(
                LLMConfig(
                    model=model["id"],
                    model_endpoint_type="groq",
                    model_endpoint=self.base_url,
                    context_window=model["context_window"],
                    handle=self.get_handle(model["id"]),
                    provider_name=self.name,
                    provider_category=self.provider_category,
                )
            )
        return configs

    def list_embedding_models(self) -> List[EmbeddingConfig]:
        return []


class TogetherProvider(OpenAIProvider):
    """TogetherAI provider that uses the /completions API

    TogetherAI can also be used via the /chat/completions API
    by settings OPENAI_API_KEY and OPENAI_API_BASE to the TogetherAI API key
    and API URL, however /completions is preferred because their /chat/completions
    function calling support is limited.
    """

    provider_type: Literal[ProviderType.together] = Field(ProviderType.together, description="The type of the provider.")
    provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")
    base_url: str = "https://api.together.ai/v1"
    api_key: str = Field(..., description="API key for the TogetherAI API.")
    default_prompt_formatter: str = Field(..., description="Default prompt formatter (aka model wrapper) to use on vLLM /completions API.")

    def list_llm_models(self) -> List[LLMConfig]:
        from letta.llm_api.openai import openai_get_model_list

        models = openai_get_model_list(self.base_url, api_key=self.api_key)
        return self._list_llm_models(models)

    async def list_llm_models_async(self) -> List[LLMConfig]:
        from letta.llm_api.openai import openai_get_model_list_async

        models = await openai_get_model_list_async(self.base_url, api_key=self.api_key)
        return self._list_llm_models(models)

    def _list_llm_models(self, models) -> List[LLMConfig]:
        pass

        # TogetherAI's response is missing the 'data' field
        # assert "data" in response, f"OpenAI model query response missing 'data' field: {response}"
        if "data" in models:
            data = models["data"]
        else:
            data = models

        configs = []
        for model in data:
            assert "id" in model, f"TogetherAI model missing 'id' field: {model}"
            model_name = model["id"]

            if "context_length" in model:
                # Context length is returned in OpenRouter as "context_length"
                context_window_size = model["context_length"]
            else:
                context_window_size = self.get_model_context_window_size(model_name)

            # We need the context length for embeddings too
            if not context_window_size:
                continue

            # Skip models that are too small for Letta
            if context_window_size <= MIN_CONTEXT_WINDOW:
                continue

            # TogetherAI includes the type, which we can use to filter for embedding models
            if "type" in model and model["type"] not in ["chat", "language"]:
                continue

            configs.append(
                LLMConfig(
                    model=model_name,
                    model_endpoint_type="together",
                    model_endpoint=self.base_url,
                    model_wrapper=self.default_prompt_formatter,
                    context_window=context_window_size,
                    handle=self.get_handle(model_name),
                    provider_name=self.name,
                    provider_category=self.provider_category,
                )
            )

        return configs

    def list_embedding_models(self) -> List[EmbeddingConfig]:
        # TODO renable once we figure out how to pass API keys through properly
        return []

        # from letta.llm_api.openai import openai_get_model_list

        # response = openai_get_model_list(self.base_url, api_key=self.api_key)

        # # TogetherAI's response is missing the 'data' field
        # # assert "data" in response, f"OpenAI model query response missing 'data' field: {response}"
        # if "data" in response:
        #     data = response["data"]
        # else:
        #     data = response

        # configs = []
        # for model in data:
        #     assert "id" in model, f"TogetherAI model missing 'id' field: {model}"
        #     model_name = model["id"]

        #     if "context_length" in model:
        #         # Context length is returned in OpenRouter as "context_length"
        #         context_window_size = model["context_length"]
        #     else:
        #         context_window_size = self.get_model_context_window_size(model_name)

        #     if not context_window_size:
        #         continue

        #     # TogetherAI includes the type, which we can use to filter out embedding models
        #     if "type" in model and model["type"] not in ["embedding"]:
        #         continue

        #     configs.append(
        #         EmbeddingConfig(
        #             embedding_model=model_name,
        #             embedding_endpoint_type="openai",
        #             embedding_endpoint=self.base_url,
        #             embedding_dim=context_window_size,
        #             embedding_chunk_size=300,  # TODO: change?
        #         )
        #     )

        # return configs


class GoogleAIProvider(Provider):
    # gemini
    provider_type: Literal[ProviderType.google_ai] = Field(ProviderType.google_ai, description="The type of the provider.")
    provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")
    api_key: str = Field(..., description="API key for the Google AI API.")
    base_url: str = "https://generativelanguage.googleapis.com"

    def check_api_key(self):
        from letta.llm_api.google_ai_client import google_ai_check_valid_api_key

        google_ai_check_valid_api_key(self.api_key)

    def list_llm_models(self):
        from letta.llm_api.google_ai_client import google_ai_get_model_list

        model_options = google_ai_get_model_list(base_url=self.base_url, api_key=self.api_key)
        model_options = [mo for mo in model_options if "generateContent" in mo["supportedGenerationMethods"]]
        model_options = [str(m["name"]) for m in model_options]

        # filter by model names
        model_options = [mo[len("models/") :] if mo.startswith("models/") else mo for mo in model_options]

        # Add support for all gemini models
        model_options = [mo for mo in model_options if str(mo).startswith("gemini-")]

        configs = []
        for model in model_options:
            configs.append(
                LLMConfig(
                    model=model,
                    model_endpoint_type="google_ai",
                    model_endpoint=self.base_url,
                    context_window=self.get_model_context_window(model),
                    handle=self.get_handle(model),
                    max_tokens=8192,
                    provider_name=self.name,
                    provider_category=self.provider_category,
                )
            )

        return configs

    async def list_llm_models_async(self):
        import asyncio

        from letta.llm_api.google_ai_client import google_ai_get_model_list_async

        # Get and filter the model list
        model_options = await google_ai_get_model_list_async(base_url=self.base_url, api_key=self.api_key)
        model_options = [mo for mo in model_options if "generateContent" in mo["supportedGenerationMethods"]]
        model_options = [str(m["name"]) for m in model_options]

        # filter by model names
        model_options = [mo[len("models/") :] if mo.startswith("models/") else mo for mo in model_options]

        # Add support for all gemini models
        model_options = [mo for mo in model_options if str(mo).startswith("gemini-")]

        # Prepare tasks for context window lookups in parallel
        async def create_config(model):
            context_window = await self.get_model_context_window_async(model)
            return LLMConfig(
                model=model,
                model_endpoint_type="google_ai",
                model_endpoint=self.base_url,
                context_window=context_window,
                handle=self.get_handle(model),
                max_tokens=8192,
                provider_name=self.name,
                provider_category=self.provider_category,
            )

        # Execute all config creation tasks concurrently
        configs = await asyncio.gather(*[create_config(model) for model in model_options])

        return configs

    def list_embedding_models(self):
        from letta.llm_api.google_ai_client import google_ai_get_model_list

        # TODO: use base_url instead
        model_options = google_ai_get_model_list(base_url=self.base_url, api_key=self.api_key)
        return self._list_embedding_models(model_options)

    async def list_embedding_models_async(self):
        from letta.llm_api.google_ai_client import google_ai_get_model_list_async

        # TODO: use base_url instead
        model_options = await google_ai_get_model_list_async(base_url=self.base_url, api_key=self.api_key)
        return self._list_embedding_models(model_options)

    def _list_embedding_models(self, model_options):
        # filter by 'generateContent' models
        model_options = [mo for mo in model_options if "embedContent" in mo["supportedGenerationMethods"]]
        model_options = [str(m["name"]) for m in model_options]
        model_options = [mo[len("models/") :] if mo.startswith("models/") else mo for mo in model_options]

        configs = []
        for model in model_options:
            configs.append(
                EmbeddingConfig(
                    embedding_model=model,
                    embedding_endpoint_type="google_ai",
                    embedding_endpoint=self.base_url,
                    embedding_dim=768,
                    embedding_chunk_size=300,  # NOTE: max is 2048
                    handle=self.get_handle(model, is_embedding=True),
                    batch_size=1024,
                )
            )
        return configs

    def get_model_context_window(self, model_name: str) -> Optional[int]:
        from letta.llm_api.google_ai_client import google_ai_get_model_context_window

        if model_name in LLM_MAX_TOKENS:
            return LLM_MAX_TOKENS[model_name]
        else:
            return google_ai_get_model_context_window(self.base_url, self.api_key, model_name)

    async def get_model_context_window_async(self, model_name: str) -> Optional[int]:
        from letta.llm_api.google_ai_client import google_ai_get_model_context_window_async

        if model_name in LLM_MAX_TOKENS:
            return LLM_MAX_TOKENS[model_name]
        else:
            return await google_ai_get_model_context_window_async(self.base_url, self.api_key, model_name)


class GoogleVertexProvider(Provider):
    provider_type: Literal[ProviderType.google_vertex] = Field(ProviderType.google_vertex, description="The type of the provider.")
    provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")
    google_cloud_project: str = Field(..., description="GCP project ID for the Google Vertex API.")
    google_cloud_location: str = Field(..., description="GCP region for the Google Vertex API.")

    def list_llm_models(self) -> List[LLMConfig]:
        from letta.llm_api.google_constants import GOOGLE_MODEL_TO_CONTEXT_LENGTH

        configs = []
        for model, context_length in GOOGLE_MODEL_TO_CONTEXT_LENGTH.items():
            configs.append(
                LLMConfig(
                    model=model,
                    model_endpoint_type="google_vertex",
                    model_endpoint=f"https://{self.google_cloud_location}-aiplatform.googleapis.com/v1/projects/{self.google_cloud_project}/locations/{self.google_cloud_location}",
                    context_window=context_length,
                    handle=self.get_handle(model),
                    max_tokens=8192,
                    provider_name=self.name,
                    provider_category=self.provider_category,
                )
            )
        return configs

    def list_embedding_models(self) -> List[EmbeddingConfig]:
        from letta.llm_api.google_constants import GOOGLE_EMBEDING_MODEL_TO_DIM

        configs = []
        for model, dim in GOOGLE_EMBEDING_MODEL_TO_DIM.items():
            configs.append(
                EmbeddingConfig(
                    embedding_model=model,
                    embedding_endpoint_type="google_vertex",
                    embedding_endpoint=f"https://{self.google_cloud_location}-aiplatform.googleapis.com/v1/projects/{self.google_cloud_project}/locations/{self.google_cloud_location}",
                    embedding_dim=dim,
                    embedding_chunk_size=300,  # NOTE: max is 2048
                    handle=self.get_handle(model, is_embedding=True),
                    batch_size=1024,
                )
            )
        return configs


class AzureProvider(Provider):
    provider_type: Literal[ProviderType.azure] = Field(ProviderType.azure, description="The type of the provider.")
    provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")
    latest_api_version: str = "2024-09-01-preview"  # https://learn.microsoft.com/en-us/azure/ai-services/openai/api-version-deprecation
    base_url: str = Field(
        ..., description="Base URL for the Azure API endpoint. This should be specific to your org, e.g. `https://letta.openai.azure.com`."
    )
    api_key: str = Field(..., description="API key for the Azure API.")
    api_version: str = Field(latest_api_version, description="API version for the Azure API")

    @model_validator(mode="before")
    def set_default_api_version(cls, values):
        """
        This ensures that api_version is always set to the default if None is passed in.
        """
        if values.get("api_version") is None:
            values["api_version"] = cls.model_fields["latest_api_version"].default
        return values

    def list_llm_models(self) -> List[LLMConfig]:
        from letta.llm_api.azure_openai import azure_openai_get_chat_completion_model_list

        model_options = azure_openai_get_chat_completion_model_list(self.base_url, api_key=self.api_key, api_version=self.api_version)
        configs = []
        for model_option in model_options:
            model_name = model_option["id"]
            context_window_size = self.get_model_context_window(model_name)
            model_endpoint = get_azure_chat_completions_endpoint(self.base_url, model_name, self.api_version)
            configs.append(
                LLMConfig(
                    model=model_name,
                    model_endpoint_type="azure",
                    model_endpoint=model_endpoint,
                    context_window=context_window_size,
                    handle=self.get_handle(model_name),
                    provider_name=self.name,
                    provider_category=self.provider_category,
                ),
            )
        return configs

    def list_embedding_models(self) -> List[EmbeddingConfig]:
        from letta.llm_api.azure_openai import azure_openai_get_embeddings_model_list

        model_options = azure_openai_get_embeddings_model_list(
            self.base_url, api_key=self.api_key, api_version=self.api_version, require_embedding_in_name=True
        )
        configs = []
        for model_option in model_options:
            model_name = model_option["id"]
            model_endpoint = get_azure_embeddings_endpoint(self.base_url, model_name, self.api_version)
            configs.append(
                EmbeddingConfig(
                    embedding_model=model_name,
                    embedding_endpoint_type="azure",
                    embedding_endpoint=model_endpoint,
                    embedding_dim=768,
                    embedding_chunk_size=300,  # NOTE: max is 2048
                    handle=self.get_handle(model_name),
                    batch_size=1024,
                ),
            )
        return configs

    def get_model_context_window(self, model_name: str) -> Optional[int]:
        """
        This is hardcoded for now, since there is no API endpoints to retrieve metadata for a model.
        """
        context_window = AZURE_MODEL_TO_CONTEXT_LENGTH.get(model_name, None)
        if context_window is None:
            context_window = LLM_MAX_TOKENS.get(model_name, 4096)
        return context_window


class VLLMChatCompletionsProvider(Provider):
    """vLLM provider that treats vLLM as an OpenAI /chat/completions proxy"""

    # NOTE: vLLM only serves one model at a time (so could configure that through env variables)
    provider_type: Literal[ProviderType.vllm] = Field(ProviderType.vllm, description="The type of the provider.")
    provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")
    base_url: str = Field(..., description="Base URL for the vLLM API.")

    def list_llm_models(self) -> List[LLMConfig]:
        # not supported with vLLM
        from letta.llm_api.openai import openai_get_model_list

        assert self.base_url, "base_url is required for vLLM provider"
        response = openai_get_model_list(self.base_url, api_key=None)

        configs = []
        for model in response["data"]:
            configs.append(
                LLMConfig(
                    model=model["id"],
                    model_endpoint_type="openai",
                    model_endpoint=self.base_url,
                    context_window=model["max_model_len"],
                    handle=self.get_handle(model["id"]),
                    provider_name=self.name,
                    provider_category=self.provider_category,
                )
            )
        return configs

    def list_embedding_models(self) -> List[EmbeddingConfig]:
        # not supported with vLLM
        return []


class VLLMCompletionsProvider(Provider):
    """This uses /completions API as the backend, not /chat/completions, so we need to specify a model wrapper"""

    # NOTE: vLLM only serves one model at a time (so could configure that through env variables)
    provider_type: Literal[ProviderType.vllm] = Field(ProviderType.vllm, description="The type of the provider.")
    provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")
    base_url: str = Field(..., description="Base URL for the vLLM API.")
    default_prompt_formatter: str = Field(..., description="Default prompt formatter (aka model wrapper) to use on vLLM /completions API.")

    def list_llm_models(self) -> List[LLMConfig]:
        # not supported with vLLM
        from letta.llm_api.openai import openai_get_model_list

        response = openai_get_model_list(self.base_url, api_key=None)

        configs = []
        for model in response["data"]:
            configs.append(
                LLMConfig(
                    model=model["id"],
                    model_endpoint_type="vllm",
                    model_endpoint=self.base_url,
                    model_wrapper=self.default_prompt_formatter,
                    context_window=model["max_model_len"],
                    handle=self.get_handle(model["id"]),
                    provider_name=self.name,
                    provider_category=self.provider_category,
                )
            )
        return configs

    def list_embedding_models(self) -> List[EmbeddingConfig]:
        # not supported with vLLM
        return []


class CohereProvider(OpenAIProvider):
    pass


class BedrockProvider(Provider):
    provider_type: Literal[ProviderType.bedrock] = Field(ProviderType.bedrock, description="The type of the provider.")
    provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")
    region: str = Field(..., description="AWS region for Bedrock")

    def check_api_key(self):
        """Check if the Bedrock credentials are valid"""
        from letta.errors import LLMAuthenticationError
        from letta.llm_api.aws_bedrock import bedrock_get_model_list

        try:
            # For BYOK providers, use the custom credentials
            if self.provider_category == ProviderCategory.byok:
                # If we can list models, the credentials are valid
                bedrock_get_model_list(
                    region_name=self.region,
                    access_key_id=self.access_key,
                    secret_access_key=self.api_key,  # api_key stores the secret access key
                )
            else:
                # For base providers, use default credentials
                bedrock_get_model_list(region_name=self.region)
        except Exception as e:
            raise LLMAuthenticationError(message=f"Failed to authenticate with Bedrock: {e}")

    def list_llm_models(self):
        from letta.llm_api.aws_bedrock import bedrock_get_model_list

        models = bedrock_get_model_list(self.region)

        configs = []
        for model_summary in models:
            model_arn = model_summary["inferenceProfileArn"]
            configs.append(
                LLMConfig(
                    model=model_arn,
                    model_endpoint_type=self.provider_type.value,
                    model_endpoint=None,
                    context_window=self.get_model_context_window(model_arn),
                    handle=self.get_handle(model_arn),
                    provider_name=self.name,
                    provider_category=self.provider_category,
                )
            )
        return configs

    async def list_llm_models_async(self) -> List[LLMConfig]:
        from letta.llm_api.aws_bedrock import bedrock_get_model_list_async

        models = await bedrock_get_model_list_async(
            self.access_key,
            self.api_key,
            self.region,
        )

        configs = []
        for model_summary in models:
            model_arn = model_summary["inferenceProfileArn"]
            configs.append(
                LLMConfig(
                    model=model_arn,
                    model_endpoint_type=self.provider_type.value,
                    model_endpoint=None,
                    context_window=self.get_model_context_window(model_arn),
                    handle=self.get_handle(model_arn),
                    provider_name=self.name,
                    provider_category=self.provider_category,
                )
            )

        return configs

    def list_embedding_models(self):
        return []

    def get_model_context_window(self, model_name: str) -> Optional[int]:
        # Context windows for Claude models
        from letta.llm_api.aws_bedrock import bedrock_get_model_context_window

        return bedrock_get_model_context_window(model_name)

    def get_handle(self, model_name: str, is_embedding: bool = False, base_name: Optional[str] = None) -> str:
        print(model_name)
        model = model_name.split(".")[-1]
        return f"{self.name}/{model}"
