"""Request builder for Cerebras Inference (OpenAI-compatible chat completions).

Docs: https://inference-docs.cerebras.ai/resources/openai — use ``max_completion_tokens``
in API examples; non-standard fields via ``extra_body`` with the OpenAI client.
"""

from __future__ import annotations

from typing import Any

from loguru import logger

from core.anthropic import ReasoningReplayMode, build_base_request_body
from core.anthropic.conversion import OpenAIConversionError
from providers.exceptions import InvalidRequestError


def _normalize_max_completion_tokens(body: dict[str, Any]) -> None:
    if "max_completion_tokens" in body:
        body.pop("max_tokens", None)
        return
    if "max_tokens" in body and body["max_tokens"] is not None:
        body["max_completion_tokens"] = body.pop("max_tokens")


def build_request_body(request_data: Any, *, thinking_enabled: bool) -> dict:
    """Build OpenAI-format request body from an Anthropic request for Cerebras."""
    logger.debug(
        "CEREBRAS_REQUEST: conversion start model={} msgs={}",
        getattr(request_data, "model", "?"),
        len(getattr(request_data, "messages", [])),
    )
    try:
        body = build_base_request_body(
            request_data,
            reasoning_replay=ReasoningReplayMode.REASONING_CONTENT
            if thinking_enabled
            else ReasoningReplayMode.DISABLED,
        )
    except OpenAIConversionError as exc:
        raise InvalidRequestError(str(exc)) from exc

    request_extra = getattr(request_data, "extra_body", None)
    if isinstance(request_extra, dict) and request_extra:
        body["extra_body"] = dict(request_extra)

    _normalize_max_completion_tokens(body)

    logger.debug(
        "CEREBRAS_REQUEST: conversion done model={} msgs={} tools={}",
        body.get("model"),
        len(body.get("messages", [])),
        len(body.get("tools", [])),
    )
    return body