# File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.

from typing import List, Optional
from typing_extensions import Literal

from ..._models import BaseModel
from ..completion_usage import CompletionUsage
from .chat_completion_token_logprob import ChatCompletionTokenLogprob

__all__ = [
    "ChatCompletionChunk",
    "Choice",
    "ChoiceDelta",
    "ChoiceDeltaFunctionCall",
    "ChoiceDeltaToolCall",
    "ChoiceDeltaToolCallFunction",
    "ChoiceLogprobs",
]


class ChoiceDeltaFunctionCall(BaseModel):
    arguments: Optional[str] = None
    """
    The arguments to call the function with, as generated by the model in JSON
    format. Note that the model does not always generate valid JSON, and may
    hallucinate parameters not defined by your function schema. Validate the
    arguments in your code before calling your function.
    """

    name: Optional[str] = None
    """The name of the function to call."""


class ChoiceDeltaToolCallFunction(BaseModel):
    arguments: Optional[str] = None
    """
    The arguments to call the function with, as generated by the model in JSON
    format. Note that the model does not always generate valid JSON, and may
    hallucinate parameters not defined by your function schema. Validate the
    arguments in your code before calling your function.
    """

    name: Optional[str] = None
    """The name of the function to call."""


class ChoiceDeltaToolCall(BaseModel):
    index: int

    id: Optional[str] = None
    """The ID of the tool call."""

    function: Optional[ChoiceDeltaToolCallFunction] = None

    type: Optional[Literal["function"]] = None
    """The type of the tool. Currently, only `function` is supported."""


class ChoiceDelta(BaseModel):
    content: Optional[str] = None
    """The contents of the chunk message."""

    function_call: Optional[ChoiceDeltaFunctionCall] = None
    """Deprecated and replaced by `tool_calls`.

    The name and arguments of a function that should be called, as generated by the
    model.
    """

    refusal: Optional[str] = None
    """The refusal message generated by the model."""

    role: Optional[Literal["developer", "system", "user", "assistant", "tool"]] = None
    """The role of the author of this message."""

    tool_calls: Optional[List[ChoiceDeltaToolCall]] = None


class ChoiceLogprobs(BaseModel):
    content: Optional[List[ChatCompletionTokenLogprob]] = None
    """A list of message content tokens with log probability information."""

    refusal: Optional[List[ChatCompletionTokenLogprob]] = None
    """A list of message refusal tokens with log probability information."""


class Choice(BaseModel):
    delta: ChoiceDelta
    """A chat completion delta generated by streamed model responses."""

    finish_reason: Optional[Literal["stop", "length", "tool_calls", "content_filter", "function_call"]] = None
    """The reason the model stopped generating tokens.

    This will be `stop` if the model hit a natural stop point or a provided stop
    sequence, `length` if the maximum number of tokens specified in the request was
    reached, `content_filter` if content was omitted due to a flag from our content
    filters, `tool_calls` if the model called a tool, or `function_call`
    (deprecated) if the model called a function.
    """

    index: int
    """The index of the choice in the list of choices."""

    logprobs: Optional[ChoiceLogprobs] = None
    """Log probability information for the choice."""


class ChatCompletionChunk(BaseModel):
    id: str
    """A unique identifier for the chat completion. Each chunk has the same ID."""

    choices: List[Choice]
    """A list of chat completion choices.

    Can contain more than one elements if `n` is greater than 1. Can also be empty
    for the last chunk if you set `stream_options: {"include_usage": true}`.
    """

    created: int
    """The Unix timestamp (in seconds) of when the chat completion was created.

    Each chunk has the same timestamp.
    """

    model: str
    """The model to generate the completion."""

    object: Literal["chat.completion.chunk"]
    """The object type, which is always `chat.completion.chunk`."""

    service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority"]] = None
    """Specifies the processing type used for serving the request.

    - If set to 'auto', then the request will be processed with the service tier
      configured in the Project settings. Unless otherwise configured, the Project
      will use 'default'.
    - If set to 'default', then the request will be processed with the standard
      pricing and performance for the selected model.
    - If set to '[flex](https://platform.openai.com/docs/guides/flex-processing)' or
      '[priority](https://openai.com/api-priority-processing/)', then the request
      will be processed with the corresponding service tier.
    - When not set, the default behavior is 'auto'.

    When the `service_tier` parameter is set, the response body will include the
    `service_tier` value based on the processing mode actually used to serve the
    request. This response value may be different from the value set in the
    parameter.
    """

    system_fingerprint: Optional[str] = None
    """
    This fingerprint represents the backend configuration that the model runs with.
    Can be used in conjunction with the `seed` request parameter to understand when
    backend changes have been made that might impact determinism.
    """

    usage: Optional[CompletionUsage] = None
    """
    An optional field that will only be present when you set
    `stream_options: {"include_usage": true}` in your request. When present, it
    contains a null value **except for the last chunk** which contains the token
    usage statistics for the entire request.

    **NOTE:** If the stream is interrupted or cancelled, you may not receive the
    final usage chunk which contains the total token usage for the request.
    """
