IInstance.py

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"""
Chart (Chart.js) tool node instance.

Binds the pipeline LLM to the ``ChartjsDriver`` and delegates tool
invocation.
"""

from __future__ import annotations

from typing import Any

from rocketlib import IInstanceBase
from rocketlib.types import IInvokeLLM

from .IGlobal import IGlobal


def _make_llm_invoker(instance: Any) -> Any:
    """Create an LLM-invoking callable bound to the pipeline instance.

    Returns a callable that accepts a ``Question`` and returns the LLM
    response text.
    """
    llm_nodes = instance.getControllerNodeIds('llm')
    if not llm_nodes:
        return None
    llm_node_id = llm_nodes[0]

    def invoke_llm(question: Any) -> str:
        result = instance.invoke('llm', IInvokeLLM(op='ask', question=question), nodeId=llm_node_id)
        if hasattr(result, 'getText') and callable(result.getText):
            return (result.getText() or '').strip()
        return str(result).strip()

    return invoke_llm


class IInstance(IInstanceBase):
    IGlobal: IGlobal

    def invoke(self, param: Any) -> Any:  # noqa: ANN401
        driver = getattr(self.IGlobal, 'driver', None)
        if driver is None:
            raise RuntimeError('chart_chartjs: driver not initialized')

        # Bind the LLM invoker before each invocation
        if driver._llm_invoke is None:
            llm_invoker = _make_llm_invoker(self.instance)
            if llm_invoker is None:
                raise RuntimeError('Chart generator requires an LLM node connected to the pipeline.')
            driver.set_llm_invoker(llm_invoker)

        return driver.handle_invoke(param)