import json
import time

STERILIZATION_TEMP_C = 72.0
REQUIRED_DURATION_SEC = 15  # HTST殺菌需持續達標的最短秒數

# 實際專案建議搭配DynamoDB記錄「持續達標開始時間」，此處為簡化示範
def lambda_handler(event, context):
    batch_id = event.get("batch_id", "unknown")
    temperature = event.get("temperature")
    duration_sec = event.get("duration_at_temp_sec", 0)

    if temperature is None:
        return {"statusCode": 400, "body": "缺少temperature欄位"}

    is_qualified = (temperature >= STERILIZATION_TEMP_C and duration_sec >= REQUIRED_DURATION_SEC)

    if is_qualified:
        print(f"批次{batch_id}殺菌條件達標：{temperature}°C持續{duration_sec}秒")
    else:
        print(f"[未達標] 批次{batch_id}：{temperature}°C持續{duration_sec}秒，"
            f"需求為{STERILIZATION_TEMP_C}°C持續{REQUIRED_DURATION_SEC}秒以上")
        # 此處可接續呼叫SNS通知品保人員該批次需複檢

    return {"statusCode": 200, "body": json.dumps({"batch_id": batch_id, "qualified": is_qualified})}