class TakeoverReadinessAssessor:
    """
    L3驾驶员接管就绪评估器
    基于GB 44721-2026要求
    
    多维度评估:
    1. 视觉就绪 - 视线是否朝向道路
    2. 认知就绪 - 注意力恢复程度
    3. 物理就绪 - 手部位置
    4. 响应能力 - 反应时间估计
    """
    
    def __init__(self):
        self.gaze_weight = 0.35    # 视线权重最高
        self.cognitive_weight = 0.25
        self.physical_weight = 0.20
        self.response_weight = 0.20
    
    def assess(self, gaze_on_road: bool, pupil_baseline: float,
               hand_on_wheel: bool, response_time_ms: float) -> dict:
        """
        评估接管就绪度
        
        Returns:
            readiness_score (0-1), recommendation
        """
        visual_score = 1.0 if gaze_on_road else 0.0
        cognitive_score = min(pupil_baseline / 5.0, 1.0)  # 瞳孔基线高=负荷高
        physical_score = 1.0 if hand_on_wheel else 0.3
        response_score = max(0, 1.0 - response_time_ms / 3000)  # 3s内满分
        
        total = (self.gaze_weight * visual_score +
                 self.cognitive_weight * cognitive_score +
                 self.physical_weight * physical_score +
                 self.response_weight * response_score)
        
        if total > 0.7:
            rec = "READY_FOR_TAKEOVER"
        elif total > 0.4:
            rec = "PARTIALLY_READY - 延长接管时间"
        else:
            rec = "NOT_READY - 触发最小风险"
        
        return {
            'score': round(total, 2),
            'visual': round(visual_score, 2),
            'cognitive': round(cognitive_score, 2),
            'physical': round(physical_score, 2),
            'response': round(response_score, 2),
            'recommendation': rec
        }