package launchserver.auth.provider;

import java.io.IOException;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;

import launcher.LauncherAPI;
import launcher.helper.VerifyHelper;
import launcher.serialize.config.ConfigObject;
import launcher.serialize.config.entry.BlockConfigEntry;
import launchserver.auth.AuthException;

public abstract class AuthProvider extends ConfigObject implements AutoCloseable {
    private static final Map<String, Adapter<AuthProvider>> AUTH_PROVIDERS = new ConcurrentHashMap<>(8);

    @LauncherAPI
    protected AuthProvider(BlockConfigEntry block) {
        super(block);
    }

    @Override
    public abstract void close() throws IOException;

    @LauncherAPI
    public abstract String auth(String login, String password) throws Exception;

    @LauncherAPI
    public static String authError(String message) throws AuthException {
        throw new AuthException(message);
    }

    @LauncherAPI
    public static AuthProvider newProvider(String name, BlockConfigEntry block) {
        VerifyHelper.verifyIDName(name);
        Adapter<AuthProvider> authHandlerAdapter = VerifyHelper.getMapValue(AUTH_PROVIDERS, name,
            String.format("Unknown auth provider: '%s'", name));
        return authHandlerAdapter.convert(block);
    }

    @LauncherAPI
    public static void registerProvider(String name, Adapter<AuthProvider> adapter) {
        VerifyHelper.putIfAbsent(AUTH_PROVIDERS, name, Objects.requireNonNull(adapter, "adapter"),
            String.format("Auth provider has been already registered: '%s'", name));
    }

    static {
        registerProvider("null", NullAuthProvider::new);
        registerProvider("accept", AcceptAuthProvider::new);
        registerProvider("reject", RejectAuthProvider::new);

        // Auth providers that doesn't do nothing :D
        registerProvider("mysql", MySQLAuthProvider::new);
        registerProvider("file", FileAuthProvider::new);
        registerProvider("request", RequestAuthProvider::new);
    }
}