"""xAI-specific utilities.

This module contains utilities specific to the xAI provider,
including reask functions, response handlers, and message formatting.
"""

from __future__ import annotations

from typing import Any, TYPE_CHECKING

from ...mode import Mode

if TYPE_CHECKING:
    from xai_sdk import chat as xchat
else:
    try:
        from xai_sdk import chat as xchat
    except ImportError:
        xchat = None


def _convert_messages(messages: list[dict[str, Any]]):
    """Convert OpenAI-style messages to xAI format."""
    if xchat is None:
        from ...core.exceptions import ConfigurationError

        raise ConfigurationError(
            "The xAI provider needs the optional dependency `xai-sdk`. "
            'Install it with `uv pip install "instructor[xai]"` (or `pip install "instructor[xai]"`). '
            "Note: xai-sdk requires Python 3.10+."
        ) from None

    converted = []
    for m in messages:
        role = m["role"]
        content = m.get("content", "")
        if isinstance(content, str):
            c = xchat.text(content)
        else:
            raise ValueError("Only string content supported for xAI provider")
        if role == "user":
            converted.append(xchat.user(c))
        elif role == "assistant":
            converted.append(xchat.assistant(c))
        elif role == "system":
            converted.append(xchat.system(c))
        elif role == "tool":
            converted.append(xchat.tool_result(content))
        else:
            raise ValueError(f"Unsupported role: {role}")
    return converted


def reask_xai_json(
    kwargs: dict[str, Any],
    response: Any,
    exception: Exception,
):
    """
    Handle reask for xAI JSON mode when validation fails.

    Kwargs modifications:
    - Modifies: "messages" (appends user message requesting correction)
    """
    kwargs = kwargs.copy()
    reask_msg = {
        "role": "user",
        "content": f"Validation Errors found:\n{exception}\nRecall the function correctly, fix the errors found in the following attempt:\n{response}",
    }
    kwargs["messages"].append(reask_msg)
    return kwargs


def reask_xai_tools(
    kwargs: dict[str, Any],
    response: Any,
    exception: Exception,
):
    """
    Handle reask for xAI tools mode when validation fails.

    Kwargs modifications:
    - Modifies: "messages" (appends assistant and user messages for tool correction)
    """
    kwargs = kwargs.copy()

    # Add assistant response to conversation history
    assistant_msg = {
        "role": "assistant",
        "content": str(response),
    }
    kwargs["messages"].append(assistant_msg)

    # Add user correction request
    reask_msg = {
        "role": "user",
        "content": f"Validation Error found:\n{exception}\nRecall the function correctly, fix the errors",
    }
    kwargs["messages"].append(reask_msg)
    return kwargs


def handle_xai_json(
    response_model: type[Any] | None, new_kwargs: dict[str, Any]
) -> tuple[type[Any] | None, dict[str, Any]]:
    """
    Handle xAI JSON mode.

    When response_model is None:
        - Converts messages from OpenAI format to xAI format
        - No schema is added to the request

    When response_model is provided:
        - Converts messages from OpenAI format to xAI format
        - Sets up the model for JSON parsing mode

    Kwargs modifications:
    - Modifies: "messages" (converts from OpenAI to xAI format)
    - Removes: instructor-specific kwargs (max_retries, validation_context, context, hooks)
    """
    # Convert messages to xAI format
    messages = new_kwargs.get("messages", [])
    new_kwargs["x_messages"] = _convert_messages(messages)

    # Remove instructor-specific kwargs that xAI doesn't support
    new_kwargs.pop("max_retries", None)
    new_kwargs.pop("validation_context", None)
    new_kwargs.pop("context", None)
    new_kwargs.pop("hooks", None)

    return response_model, new_kwargs


def handle_xai_tools(
    response_model: type[Any] | None, new_kwargs: dict[str, Any]
) -> tuple[type[Any] | None, dict[str, Any]]:
    """
    Handle xAI tools mode.

    When response_model is None:
        - Converts messages from OpenAI format to xAI format
        - No tools are configured

    When response_model is provided:
        - Converts messages from OpenAI format to xAI format
        - Sets up tool schema from the response model
        - Configures tool choice for automatic tool selection

    Kwargs modifications:
    - Modifies: "messages" (converts from OpenAI to xAI format)
    - Adds: "tool" (xAI tool schema) - only when response_model provided
    - Removes: instructor-specific kwargs (max_retries, validation_context, context, hooks)
    """
    # Convert messages to xAI format
    messages = new_kwargs.get("messages", [])
    new_kwargs["x_messages"] = _convert_messages(messages)

    # Remove instructor-specific kwargs that xAI doesn't support
    new_kwargs.pop("max_retries", None)
    new_kwargs.pop("validation_context", None)
    new_kwargs.pop("context", None)
    new_kwargs.pop("hooks", None)

    if response_model is not None and xchat is not None:
        # Set up tool schema for structured output
        new_kwargs["tool"] = xchat.tool(
            name=response_model.__name__,
            description=response_model.__doc__ or "",
            parameters=response_model.model_json_schema(),
        )

    return response_model, new_kwargs


# Handler registry for xAI
XAI_HANDLERS = {
    Mode.XAI_JSON: {
        "reask": reask_xai_json,
        "response": handle_xai_json,
    },
    Mode.XAI_TOOLS: {
        "reask": reask_xai_tools,
        "response": handle_xai_tools,
    },
}