package decorator;

/**
 * Decorator Design Pattern — Runnable Demo
 *
 * Shows how text processors can be stacked like Java IO streams.
 * Each decorator adds one behaviour; the order of wrapping matters.
 *
 * Run: javac decorator/*.java && java decorator.Main
 * Article: https://ankurm.com/decorator-design-pattern-java/
 */
public class Main {

    public static void main(String[] args) {
        System.out.println("=== Decorator Design Pattern Demo ===\n");

        String input = "  hello world, badword is here  ";
        System.out.println("Input: \"" + input + "\"");
        System.out.println();

        // Stack 1: just trim
        TextProcessor trimOnly = new TrimDecorator(new PlainTextProcessor());
        System.out.println("Trim only:               \"" + trimOnly.process(input) + "\"");

        // Stack 2: trim, then upper case
        TextProcessor trimThenUpper =
            new UpperCaseDecorator(
                new TrimDecorator(
                    new PlainTextProcessor()));
        System.out.println("Trim + UpperCase:        \"" + trimThenUpper.process(input) + "\"");

        // Stack 3: trim, filter profanity, then upper case
        TextProcessor full =
            new UpperCaseDecorator(
                new ProfanityFilterDecorator(
                    new TrimDecorator(
                        new PlainTextProcessor())));
        System.out.println("Trim + Filter + Upper:   \"" + full.process(input) + "\"");

        // Stack 4: different order — filter then trim (order matters!)
        TextProcessor filterFirst =
            new TrimDecorator(
                new ProfanityFilterDecorator(
                    new PlainTextProcessor()));
        System.out.println("Filter + Trim:           \"" + filterFirst.process(input) + "\"");

        System.out.println();
        System.out.println("JDK parallel: new BufferedReader(new InputStreamReader(socket.getInputStream()))");
        System.out.println("Same pattern: each wrapper adds one behaviour, order matters.");

        System.out.println("\n=== Demo complete ===");
    }
}