package chain;

/**
 * Handler interface — defines the chain contract.
 * Each handler knows its next handler and can either
 * handle the request itself or pass it along.
 */
public abstract class SupportHandler {

    private SupportHandler next;

    public SupportHandler setNext(SupportHandler next) {
        this.next = next;
        return next;  // fluent API: h1.setNext(h2).setNext(h3)
    }

    // Template method: subclasses implement handle(); base manages chaining
    public final void handleRequest(SupportTicket ticket) {
        if (canHandle(ticket)) {
            handle(ticket);
        } else if (next != null) {
            System.out.println("  [" + getClass().getSimpleName() + "] passing up...");
            next.handleRequest(ticket);
        } else {
            System.out.println("  [UNHANDLED] No handler for: " + ticket);
        }
    }

    protected abstract boolean canHandle(SupportTicket ticket);
    protected abstract void handle(SupportTicket ticket);
}