package org.keycloak.testframework.clustering;

import java.util.List;

import org.keycloak.testframework.annotations.InjectLoadBalancer;
import org.keycloak.testframework.injection.DependenciesBuilder;
import org.keycloak.testframework.injection.Dependency;
import org.keycloak.testframework.injection.InstanceContext;
import org.keycloak.testframework.injection.RequestedInstance;
import org.keycloak.testframework.injection.Supplier;
import org.keycloak.testframework.injection.SupplierOrder;
import org.keycloak.testframework.server.ClusteredKeycloakServer;
import org.keycloak.testframework.server.KeycloakServer;
import org.keycloak.testframework.server.KeycloakServerConfigBuilder;
import org.keycloak.testframework.server.KeycloakServerConfigInterceptor;

public class LoadBalancerSupplier implements Supplier<LoadBalancer, InjectLoadBalancer>, KeycloakServerConfigInterceptor<LoadBalancer, InjectLoadBalancer> {

    @Override
    public LoadBalancer getValue(InstanceContext<LoadBalancer, InjectLoadBalancer> instanceContext) {
        KeycloakServer server = instanceContext.getDependency(KeycloakServer.class);

        if (server instanceof ClusteredKeycloakServer clusteredKeycloakServer) {
            return new LoadBalancer(clusteredKeycloakServer);
        }

        throw new IllegalStateException("Load balancer can only be used with ClusteredKeycloakServer");
    }

    @Override
    public void close(InstanceContext<LoadBalancer, InjectLoadBalancer> instanceContext) {
        instanceContext.getValue().close();
    }

    @Override
    public boolean compatible(InstanceContext<LoadBalancer, InjectLoadBalancer> a, RequestedInstance<LoadBalancer, InjectLoadBalancer> b) {
        return true;
    }

    @Override
    public int order() {
        return SupplierOrder.BEFORE_REALM;
    }

    @Override
    public KeycloakServerConfigBuilder intercept(KeycloakServerConfigBuilder serverConfig, InstanceContext<LoadBalancer, InjectLoadBalancer> instanceContext) {
        return serverConfig.option("hostname", LoadBalancer.HOSTNAME);
    }

    @Override
    public List<Dependency> getDependencies(RequestedInstance<LoadBalancer, InjectLoadBalancer> instanceContext) {
        return DependenciesBuilder.create(KeycloakServer.class).build();
    }
}
