"""物流模块基类,不做具体实现"""
from enum import Enum

class LogisticsType(Enum):
    EXPRESS = '快递'
    LTL = '卡派'
    OCEAN = '海运'
    AIR = '空运'
class PortType(Enum):
    DEFAULT = '默认'
    WEST = 'west'
    CENTRAL = 'central'
    EAST = 'east'
    SOUTH = 'south'
    NORTH = 'north'

# 基础物流费用类
class BaseLogistics():
    """基础物流类，强制要求子类定义特定属性"""
    company: str   
    currency:str = 'USD'  # 货币单位，默认美元
    port: PortType = PortType.DEFAULT   
    logistics_type:LogisticsType
    active: bool = True # 是否启用该物流,默认未启用
    def __init__(self):
        # 检查子类是否定义了必要的类变量
        for attr in ['company', 'country_code', 'country']:
            if not getattr(self.__class__, attr, None):
                raise AttributeError(f"Subclass {self.__class__.__name__} is missing required attribute '{attr}'.")

    def __repr__(self):
        return f"类名：{self.__class__.__name__}, 物流类型：{self.logistics_type.value}"
    
    @classmethod
    def get_open_subclasses(cls):
        """递归获取所有启用状态为 True 的子类"""
        subclasses = set(cls.__subclasses__())
        for subclass in cls.__subclasses__():
            subclasses.update(subclass.get_open_subclasses())
        subclasses = {subclass for subclass in subclasses if subclass.active ==True}
        return subclasses
    @classmethod
    def get_close_subclasses(cls):
        """获取关闭状态的子类，状态为 False 的子类"""
        subclasses = set(cls.__subclasses__())
        for subclass in cls.__subclasses__():
            subclasses.update(subclass.get_close_subclasses())
        return {subclass for subclass in subclasses if subclass.active == False}
    @classmethod
    def open_logistics(cls):
        """打开该类"""
        cls.active = True
    @classmethod
    def close_logistics(cls):
        """关闭该类"""
        cls.active = False
    


class TailLogistics(BaseLogistics):
    """尾端物流类，包含快递和卡派"""
    # 费用结果保存在实例对象中，不需要cal函数返回
    country_code: str
    country: str
    company: str   
    currency:str = 'USD'  # 货币单位，默认美元
    port: PortType = PortType.DEFAULT   
    logistics_type = LogisticsType.EXPRESS  # 默认快递
    def __init__(self):
        super().__init__()
    def calculate_fee(self):
        """计算费用"""
        raise NotImplementedError("Subclasses must implement express fee calculation.")


class HeadLogistics(BaseLogistics):
    """头程物流类，包含海运和空运"""
    country_code: list[str]
    country: list[str]
    logistics_type = LogisticsType.OCEAN  # 默认海运
    currency = 'CNY'
    def __init__(self):
        super().__init__()
        self.head_ratio:float

    def calculate_fee(self, packages):
        """计算费用"""
        detail_amount = {
            "volume_weight":0.00,
            "head_per":0.00,
            "head_amount":0.00
        }
        total_weight = sum([package.get_volume_weight(6000) for package in packages])
        detail_amount['volume_weight'] = round(total_weight,2)
        detail_amount['head_per'] = self.head_ratio
        detail_amount["head_amount"] = total_weight * self.head_ratio
        return detail_amount