"""
实例：
汤宝宝申请报销款，需要走产品经理、部门经理和总经理的审核~
"""

class Manager:
    def __init__(self, name):
        self.name = name
        self.successor = None
        self.amount = 0

    def set_successor(self, manager: 'Manager'):
        self.successor = manager
        print(f"{self.name}的下一级经理是{manager.name}")

    def set_amount_right(self, amount: float):
        self.amount = amount
        print(f"{self.name}的报销权限是{amount:.2f}元")

    def have_right(self, amount: float) -> bool:
        right = amount <= self.amount
        if right:
            print(f"{self.name}有权限审批{amount:.2f}元的报销请求")
        else:
            print(f"{self.name}没有权限审批{amount:.2f}元的报销请求")
        return right

    def approve(self, name:str, amount: float):
        print(f"{name}提交了一笔{amount:.2f}元的报销请求")
        if self.have_right(amount):
            print(f"{self.name}审批通过了{name}的报销请求，金额为{amount:.2f}元")
        elif self.successor:
            print(f"{self.name}将{name}的报销请求上报给{self.successor.name}审批")
            self.successor.approve(name, amount)
        else:
            print(f"没有合适的经理审批{name}的报销请求，金额为{amount:.2f}元")

if __name__ == "__main__":
    print("========= 责任链模式 =========")

    # 创建经理
    pm = Manager("产品经理")
    pm.set_amount_right(1000)
    dm = Manager("部门经理")
    dm.set_amount_right(5000)
    gm = Manager("总经理")
    gm.set_amount_right(20000)

    # 设置责任链
    pm.set_successor(dm)
    dm.set_successor(gm)

    # 提交报销请求
    print("-----")
    pm.approve("汤宝宝", 800)
    print("-----")
    pm.approve("汤宝宝", 3000)
    print("-----")
    pm.approve("汤宝宝", 15000)
    print("-----")
    pm.approve("汤宝宝", 25000)

    print("\n======= 责任链模式结束 =======")