#include <iostream>
#include <memory>  // 提供智能指針的定義和實(shí)現(xiàn)
// 抽象組件類：咖啡
class Coffee {
public:
    virtual ~Coffee() {}
    // 獲取咖啡描述的方法，純虛函數(shù)
    virtual std::string getDescription() const = 0;
    // 獲取咖啡價(jià)格的方法，純虛函數(shù)
    virtual double cost() const = 0;
};
// 具體組件類：基本咖啡
class BasicCoffee : public Coffee {
public:
    // 實(shí)現(xiàn)獲取描述的方法
    std::string getDescription() const override {
        return "Basic Coffee";
    }
    // 實(shí)現(xiàn)獲取價(jià)格的方法
    double cost() const override {
        return 5.0; // 基本咖啡的價(jià)格
    }
};
// 抽象裝飾器類：咖啡裝飾器
class CoffeeDecorator : public Coffee {
protected:
    // 持有一個(gè)指向被裝飾對(duì)象的指針
    std::shared_ptr<Coffee> coffee;
public:
    // 構(gòu)造函數(shù)，接受一個(gè)被裝飾對(duì)象的指針
    CoffeeDecorator(std::shared_ptr<Coffee> coffee) : coffee(coffee) {}
    // 實(shí)現(xiàn)獲取描述的方法，調(diào)用被裝飾對(duì)象的方法
    std::string getDescription() const override {
        return coffee->getDescription();
    }
    // 實(shí)現(xiàn)獲取價(jià)格的方法，調(diào)用被裝飾對(duì)象的方法
    double cost() const override {
        return coffee->cost();
    }
};
// 具體裝飾器類：牛奶裝飾器
class MilkDecorator : public CoffeeDecorator {
public:
    // 構(gòu)造函數(shù)，接受一個(gè)被裝飾對(duì)象的指針
    MilkDecorator(std::shared_ptr<Coffee> coffee) : CoffeeDecorator(coffee) {}
    // 實(shí)現(xiàn)獲取描述的方法，添加牛奶的描述
    std::string getDescription() const override {
        return coffee->getDescription() + ", Milk";
    }
    // 實(shí)現(xiàn)獲取價(jià)格的方法，添加牛奶的價(jià)格
    double cost() const override {
        return coffee->cost() + 1.5; // 牛奶的價(jià)格
    }
};
// 具體裝飾器類：糖裝飾器
class SugarDecorator : public CoffeeDecorator {
public:
    // 構(gòu)造函數(shù)，接受一個(gè)被裝飾對(duì)象的指針
    SugarDecorator(std::shared_ptr<Coffee> coffee) : CoffeeDecorator(coffee) {}
    // 實(shí)現(xiàn)獲取描述的方法，添加糖的描述
    std::string getDescription() const override {
        return coffee->getDescription() + ", Sugar";
    }
    // 實(shí)現(xiàn)獲取價(jià)格的方法，添加糖的價(jià)格
    double cost() const override {
        return coffee->cost() + 0.5; // 糖的價(jià)格
    }
};
int main() {
    // 創(chuàng)建一個(gè)基本咖啡對(duì)象
    std::shared_ptr<Coffee> basicCoffee = std::make_shared<BasicCoffee>();
    std::cout << "Description: " << basicCoffee->getDescription() << ", Cost: " <<  basicCoffee->cost() << " RMB" << std::endl;
    // 用牛奶裝飾基本咖啡
    std::shared_ptr<Coffee> coffeeWithMilk =  std::make_shared<MilkDecorator>(basicCoffee);
    std::cout << "Description: " << coffeeWithMilk->getDescription() << ", Cost: "  << coffeeWithMilk->cost() << " RMB" << std::endl;
    // 再用糖裝飾已加牛奶的咖啡
    std::shared_ptr<Coffee> coffeeWithMilkAndSugar =  std::make_shared<SugarDecorator>(coffeeWithMilk);
    std::cout << "Description: " << coffeeWithMilkAndSugar->getDescription() << ",  Cost: " << coffeeWithMilkAndSugar->cost() << " RMB" << std::endl;
    return 0;
}