"""Blind comparison between a collaboration report and a roundtable export."""

from __future__ import annotations

from app.report_collaboration.eval.schema import ComparisonResult, EvalTask, ReportCandidate, TaskScore
from app.report_collaboration.eval.scorer import score_report


def compare_blind(
    task: EvalTask,
    collaboration: ReportCandidate,
    roundtable: ReportCandidate,
    *,
    directed_hits: list[bool] | None = None,
) -> ComparisonResult:
    left = score_report(task, collaboration.model_copy(update={"source": "collaboration"}), directed_hits=directed_hits)
    right = score_report(task, roundtable.model_copy(update={"source": "roundtable"}), directed_hits=directed_hits)
    deltas = {item.name: round(item.score - right.metric(item.name).score, 4) for item in left.metrics}
    if left.composite > right.composite + 1e-9:
        winner = "collaboration"
    elif right.composite > left.composite + 1e-9:
        winner = "roundtable"
    else:
        winner = "tie"
    notes = _notes(winner, left, right, deltas)
    return ComparisonResult(task_id=task.id, winner=winner, collaboration=left, roundtable=right, deltas=deltas, notes=notes)


def _notes(winner: str, left: TaskScore, right: TaskScore, deltas: dict[str, float]) -> str:
    drivers = [name for name, delta in sorted(deltas.items(), key=lambda item: item[1], reverse=True) if delta > 0][:3]
    if winner == "collaboration":
        return "协作报告在 " + "、".join(drivers or ["综合分"]) + " 上优于会商导出；上线不得仅以「已接入 AgentScope」为由。"
    if winner == "roundtable":
        return "会商导出综合分更高。按决策门，本任务不能作为协作方案上线依据。"
    return f"综合分持平（{left.composite} vs {right.composite}）。"


__all__ = ["compare_blind"]