from __future__ import annotations
from abc import ABC, abstractmethod


class Creator(ABC):
    """
    The Creator class declares the factory method that is supposed to return an
    object of a Product class. The Creator's subclasses usually provide the
    implementation of this method.
    """

    @abstractmethod
    def factory_method(self):
        """
        Note that the Creator may also provide some default implementation of
        the factory method.
        """
        pass

    def some_operation(self) -> str:
        """
        Also note that, despite its name, the Creator's primary responsibility
        is not creating products. Usually, it contains some core business logic
        that relies on Product objects, returned by the factory method.
        Subclasses can indirectly change that business logic by overriding the
        factory method and returning a different type of product from it.
        """

        # Call the factory method to create a Product object.
        product = self.factory_method()

        # Now, use the product.
        result = f"Creator: The same creator's code has just worked with {product.operation()}"

        return result


"""
Concrete Creators override the factory method in order to change the resulting
product's type.
"""


class ConcreteCreator1(Creator):
    """
    Note that the signature of the method still uses the abstract product type,
    even though the concrete product is actually returned from the method. This
    way the Creator can stay independent of concrete product classes.
    """

    def factory_method(self) -> ConcreteProduct1:
        return ConcreteProduct1()


class ConcreteCreator2(Creator):
    def factory_method(self) -> ConcreteProduct2:
        return ConcreteProduct2()


class Product(ABC):
    """
    The Product interface declares the operations that all concrete products
    must implement.
    """

    @abstractmethod
    def operation(self) -> str:
        pass


"""
Concrete Products provide various implementations of the Product interface.
"""


class ConcreteProduct1(Product):
    def operation(self) -> str:
        return "{Result of the ConcreteProduct1}"


class ConcreteProduct2(Product):
    def operation(self) -> str:
        return "{Result of the ConcreteProduct2}"


def client_code(creator: Creator) -> None:
    """
    The client code works with an instance of a concrete creator, albeit through
    its base interface. As long as the client keeps working with the creator via
    the base interface, you can pass it any creator's subclass.
    """

    print(f"Client: I'm not aware of the creator's class, but it still works.\n"
          f"{creator.some_operation()}", end="")


if __name__ == "__main__":
    print("App: Launched with the ConcreteCreator1.")
    client_code(ConcreteCreator1())
    print("\n")

    print("App: Launched with the ConcreteCreator2.")
    client_code(ConcreteCreator2())    	
    	

    	
    		
namespace RefactoringGuru\FactoryMethod\Conceptual;

/**
 * The Creator class declares the factory method that is supposed to return an
 * object of a Product class. The Creator's subclasses usually provide the
 * implementation of this method.
 */
abstract class Creator
{
    /**
     * Note that the Creator may also provide some default implementation of the
     * factory method.
     */
    abstract public function factoryMethod(): Product;

    /**
     * Also note that, despite its name, the Creator's primary responsibility is
     * not creating products. Usually, it contains some core business logic that
     * relies on Product objects, returned by the factory method. Subclasses can
     * indirectly change that business logic by overriding the factory method
     * and returning a different type of product from it.
     */
    public function someOperation(): string
    {
        // Call the factory method to create a Product object.
        $product = $this->factoryMethod();
        // Now, use the product.
        $result = "Creator: The same creator's code has just worked with " .
            $product->operation();

        return $result;
    }
}

/**
 * Concrete Creators override the factory method in order to change the
 * resulting product's type.
 */
class ConcreteCreator1 extends Creator
{
    /**
     * Note that the signature of the method still uses the abstract product
     * type, even though the concrete product is actually returned from the
     * method. This way the Creator can stay independent of concrete product
     * classes.
     */
    public function factoryMethod(): Product
    {
        return new ConcreteProduct1();
    }
}

class ConcreteCreator2 extends Creator
{
    public function factoryMethod(): Product
    {
        return new ConcreteProduct2();
    }
}

/**
 * The Product interface declares the operations that all concrete products must
 * implement.
 */
interface Product
{
    public function operation(): string;
}

/**
 * Concrete Products provide various implementations of the Product interface.
 */
class ConcreteProduct1 implements Product
{
    public function operation(): string
    {
        return "{Result of the ConcreteProduct1}";
    }
}

class ConcreteProduct2 implements Product
{
    public function operation(): string
    {
        return "{Result of the ConcreteProduct2}";
    }
}

/**
 * The client code works with an instance of a concrete creator, albeit through
 * its base interface. As long as the client keeps working with the creator via
 * the base interface, you can pass it any creator's subclass.
 */
function clientCode(Creator $creator)
{
    // ...
    echo "Client: I'm not aware of the creator's class, but it still works.\n"
        . $creator->someOperation();
    // ...
}

/**
 * The Application picks a creator's type depending on the configuration or
 * environment.
 */
echo "App: Launched with the ConcreteCreator1.\n";
clientCode(new ConcreteCreator1());
echo "\n\n";

echo "App: Launched with the ConcreteCreator2.\n";
clientCode(new ConcreteCreator2());    	
    	

    	
    		
interface ImageReader {
    DecodedImage getDecodeImage();
}

class DecodedImage {
    private String image;

    public DecodedImage(String image) {
        this.image = image;
    }

    @Override
    public String toString() {
        return image + ": is decoded";
    }
}

class GifReader implements ImageReader {
    private DecodedImage decodedImage;

    public GifReader(String image) {
        this.decodedImage = new DecodedImage(image);
    }

    @Override
    public DecodedImage getDecodeImage() {
        return decodedImage;
    }
}

class JpegReader implements ImageReader {
    private DecodedImage decodedImage;

    public JpegReader(String image) {
        decodedImage = new DecodedImage(image);
    }

    @Override
    public DecodedImage getDecodeImage() {
        return decodedImage;
    }
}

public class FactoryMethodDemo {
    public static void main(String[] args) {
        DecodedImage decodedImage;
        ImageReader reader = null;
        String image = args[0];
        String format = image.substring(image.indexOf('.') + 1, (image.length()));
        if (format.equals("gif")) {
            reader = new GifReader(image);
        }
        if (format.equals("jpeg")) {
            reader = new JpegReader(image);
        }
        assert reader != null;
        decodedImage = reader.getDecodeImage();
        System.out.println(decodedImage);
    }
}