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package it.necsi.keycloak;

import java.io.InputStream;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.keycloak.adapters.KeycloakConfigResolver;
import org.keycloak.adapters.KeycloakDeployment;
import org.keycloak.adapters.KeycloakDeploymentBuilder;
import org.keycloak.adapters.spi.HttpFacade;

/**
 *
 * @author Mattia
 */
public class PathBasedKeycloakConfigResolver implements KeycloakConfigResolver {

    private final Map<String, KeycloakDeployment> cache = new ConcurrentHashMap<>();

    @Override
    public KeycloakDeployment resolve(HttpFacade.Request request) {
        String path = request.getURI();
        int multitenantIndex = path.indexOf("risolvo/");
        if (multitenantIndex == -1) {
            throw new IllegalStateException("Not able to resolve realm from the request path!");
        }

        String realm = path.substring(path.indexOf("risolvo/")).split("/")[1];
        if (realm.contains("?")) {
            realm = realm.split("\\?")[0];
        }

        KeycloakDeployment deployment = cache.get(realm);
        if (null == deployment) {
            // not found on the simple cache, try to load it from the file system
            InputStream is = getClass().getResourceAsStream("/" + realm + "-keycloak.json");
            if (is == null) {
                throw new IllegalStateException("Not able to find the file /" + realm + "-keycloak.json");
            }
            deployment = KeycloakDeploymentBuilder.build(is);
            cache.put(realm, deployment);
        }

        return deployment;
    }

}