"""
Adapter: Reflective Mutation Proposer.

Implements the ProposerPort via the DSPy InstructionProposer.
Converts trajectories into readable format for the LLM proposer.
"""
from __future__ import annotations

import dspy

from prometheus.domain.entities import Prompt, Trajectory
from prometheus.domain.ports import ProposerPort
from prometheus.infrastructure.dspy_modules import InstructionProposer


class DSPyProposerAdapter(ProposerPort):
    """Uses evaluation trajectories to build a failure report and propose a new prompt."""

    def __init__(self, lm: dspy.LM) -> None:
        self._lm = lm
        self._proposer = InstructionProposer()

    def propose(
        self,
        current_prompt: Prompt,
        trajectories: list[Trajectory],
        task_description: str,
    ) -> Prompt:
        failure_examples = self._format_failures(trajectories)
        with dspy.context(lm=self._lm):
            pred = self._proposer(
                current_instruction=current_prompt.text,
                task_description=task_description,
                failure_examples=failure_examples,
            )
        return Prompt(text=pred.new_instruction)

    @staticmethod
    def _format_failures(trajectories: list[Trajectory]) -> str:
        """Convert trajectories into a structured textual report."""
        sections: list[str] = []
        for i, t in enumerate(trajectories, 1):
            section = (
                f"# Example {i}\n"
                f"## Input\n{t.input_text}\n\n"
                f"## Generated Output\n{t.output_text}\n\n"
                f"## Score\n{t.score:.2f}\n\n"
                f"## Feedback\n{t.feedback}\n"
            )
            sections.append(section)
        return "\n---\n".join(sections)