"""
Active Straight-Leg Raise rubric scorer — pure function, no model calls.

FMS ASLR Criteria (bilateral):
- Score 3: raised leg malleolus past contralateral knee (>70°), down leg flat.
- Score 2: malleolus between mid-thigh and knee (45-70°).
- Score 1: malleolus below mid-thigh (<45°).
- Score 0: PAIN — never auto-scored.
"""
from __future__ import annotations

from formscout.types import BiomechFeatures, ScoreResult


def score_active_slr(features: BiomechFeatures) -> ScoreResult:
    """Pure rubric scorer for active straight-leg raise."""
    angles = features.angles
    alignments = features.alignments

    has_angle = "raised_leg_angle_deg" in angles
    if not has_angle:
        return ScoreResult(
            score=1, rationale="Insufficient data: leg raise angle not measurable",
            confidence=0.3, notes="missing key measurements",
        )

    angle = angles["raised_leg_angle_deg"]
    past_knee = alignments.get("past_contralateral_knee", False)
    past_mid = alignments.get("past_mid_thigh", False)
    down_flat = alignments.get("down_leg_flat", True)

    rationale_parts = []

    if past_knee and down_flat:
        score = 3
        rationale_parts.append(f"Raised leg at {angle:.0f}° (past contralateral knee)")
    elif past_mid:
        score = 2
        rationale_parts.append(f"Raised leg at {angle:.0f}° (between mid-thigh and knee)")
        if not down_flat:
            rationale_parts.append("down leg lifted off surface")
    else:
        score = 1
        rationale_parts.append(f"Raised leg only {angle:.0f}° (below mid-thigh)")

    confidence = features.confidence * 0.9

    return ScoreResult(
        score=score, rationale="; ".join(rationale_parts),
        confidence=confidence, notes="",
    )