package chain;

/**
 * Chain of Responsibility Design Pattern — Runnable Demo
 *
 * A support ticket routing system where each handler
 * either resolves a ticket or passes it up the chain.
 *
 * Run: javac chain/*.java -d out/chain && java -cp out/chain chain.Main
 * Article: https://ankurm.com/chain-of-responsibility-design-pattern-java/
 */
public class Main {

    public static void main(String[] args) {
        System.out.println("=== Chain of Responsibility Demo ===\n");

        // Build the chain: L1 -> L2 -> L3 -> Critical
        SupportHandler l1 = new Level1Support();
        l1.setNext(new Level2Support())
          .setNext(new Level3Support())
          .setNext(new CriticalIncidentTeam());

        SupportTicket[] tickets = {
            new SupportTicket("Can't find the login button",          SupportTicket.Priority.LOW),
            new SupportTicket("API returns 500 on /checkout",          SupportTicket.Priority.MEDIUM),
            new SupportTicket("Database replication lag > 30s",        SupportTicket.Priority.HIGH),
            new SupportTicket("Complete payment system outage",         SupportTicket.Priority.CRITICAL),
        };

        for (SupportTicket t : tickets) {
            System.out.println("Ticket: " + t);
            l1.handleRequest(t);
            System.out.println();
        }

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