package org.keycloak.models.cache;

import org.keycloak.models.ApplicationModel;
import org.keycloak.models.ClientModel;
import org.keycloak.models.KeycloakSession;
import org.keycloak.models.KeycloakTransaction;
import org.keycloak.models.ModelProvider;
import org.keycloak.models.OAuthClientModel;
import org.keycloak.models.RealmModel;
import org.keycloak.models.RoleModel;
import org.keycloak.models.SocialLinkModel;
import org.keycloak.models.UserModel;
import org.keycloak.models.UserSessionModel;
import org.keycloak.models.UsernameLoginFailureModel;
import org.keycloak.models.cache.entities.CachedApplication;
import org.keycloak.models.cache.entities.CachedApplicationRole;
import org.keycloak.models.cache.entities.CachedOAuthClient;
import org.keycloak.models.cache.entities.CachedRealm;
import org.keycloak.models.cache.entities.CachedRealmRole;
import org.keycloak.models.cache.entities.CachedRole;
import org.keycloak.models.cache.entities.CachedUser;

import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
 * @version $Revision: 1 $
 */
public class DefaultCacheModelProvider implements CacheModelProvider {
    protected KeycloakCache cache;
    protected KeycloakSession session;
    protected ModelProvider delegate;
    protected KeycloakTransaction transactionDelegate;
    protected boolean transactionActive;
    protected boolean setRollbackOnly;

    protected Set<String> realmInvalidations = new HashSet<String>();
    protected Set<String> appInvalidations = new HashSet<String>();
    protected Set<String> roleInvalidations = new HashSet<String>();
    protected Set<String> clientInvalidations = new HashSet<String>();
    protected Set<String> userInvalidations = new HashSet<String>();
    protected Map<String, RealmModel> managedRealms = new HashMap<String, RealmModel>();
    protected Map<String, ApplicationModel> managedApplications = new HashMap<String, ApplicationModel>();
    protected Map<String, OAuthClientModel> managedClients = new HashMap<String, OAuthClientModel>();
    protected Map<String, RoleModel> managedRoles = new HashMap<String, RoleModel>();
    protected Map<String, UserModel> managedUsers = new HashMap<String, UserModel>();

    protected boolean clearAll;

    public DefaultCacheModelProvider(KeycloakCache cache, KeycloakSession session) {
        this.cache = cache;
        this.session = session;
    }

    @Override
    public ModelProvider getDelegate() {
        if (!transactionActive) throw new IllegalStateException("Cannot access delegate without a transaction");
        if (delegate != null) return delegate;
        delegate = session.getProvider(ModelProvider.class);
        transactionDelegate = delegate.getTransaction();
        if (!transactionDelegate.isActive()) {
            transactionDelegate.begin();
            if (setRollbackOnly) {
                transactionDelegate.setRollbackOnly();
            }
        }
        return delegate;
    }

    @Override
    public void registerRealmInvalidation(String id) {
        realmInvalidations.add(id);
    }

    @Override
    public void registerApplicationInvalidation(String id) {
        appInvalidations.add(id);
    }

    @Override
    public void registerRoleInvalidation(String id) {
        roleInvalidations.add(id);
    }

    @Override
    public void registerOAuthClientInvalidation(String id) {
        clientInvalidations.add(id);
    }

    @Override
    public void registerUserInvalidation(String id) {
        userInvalidations.add(id);
    }

    protected void runInvalidations() {
        for (String id : realmInvalidations) {
            cache.invalidateCachedRealmById(id);
        }
        for (String id : roleInvalidations) {
            cache.invalidateRoleById(id);
        }
        for (String id : appInvalidations) {
            cache.invalidateCachedApplicationById(id);
        }
        for (String id : clientInvalidations) {
            cache.invalidateCachedOAuthClientById(id);
        }
        for (String id : userInvalidations) {
            cache.invalidateCachedUserById(id);
        }

    }

    @Override
    public KeycloakTransaction getTransaction() {
        return new KeycloakTransaction() {
            @Override
            public void begin() {
                transactionActive = true;
            }

            @Override
            public void commit() {
                if (delegate == null) return;
                try {
                    delegate.getTransaction().commit();
                    if (clearAll) {
                        cache.clear();
                    }
                } finally {
                    runInvalidations();
                }
            }

            @Override
            public void rollback() {
                setRollbackOnly = true;
                if (delegate == null) return;
                try {
                    delegate.getTransaction().rollback();
                } finally {
                    runInvalidations();
                }
            }

            @Override
            public void setRollbackOnly() {
                setRollbackOnly = true;
                if (delegate == null) return;
                delegate.getTransaction().setRollbackOnly();
                setRollbackOnly = true;
            }

            @Override
            public boolean getRollbackOnly() {
                return setRollbackOnly;
            }

            @Override
            public boolean isActive() {
                return transactionActive;
            }
        };
    }

    @Override
    public RealmModel createRealm(String name) {
        RealmModel realm = getDelegate().createRealm(name);
        registerRealmInvalidation(realm.getId());
        return realm;
    }

    @Override
    public RealmModel createRealm(String id, String name) {
        RealmModel realm =  getDelegate().createRealm(id, name);
        registerRealmInvalidation(realm.getId());
        return realm;
    }

    @Override
    public RealmModel getRealm(String id) {
        CachedRealm cached = cache.getCachedRealm(id);
        if (cached == null) {
            RealmModel model = getDelegate().getRealm(id);
            if (model == null) return null;
            if (realmInvalidations.contains(id)) return model;
            cached = new CachedRealm(cache, this, model);
            cache.addCachedRealm(cached);
        } else if (realmInvalidations.contains(id)) {
            return getDelegate().getRealm(id);
        } else if (managedRealms.containsKey(id)) {
            return managedRealms.get(id);
        }
        RealmAdapter adapter = new RealmAdapter(cached, this);
        managedRealms.put(id, adapter);
        return adapter;
    }

    @Override
    public RealmModel getRealmByName(String name) {
        CachedRealm cached = cache.getCachedRealmByName(name);
        if (cached == null) {
            RealmModel model = getDelegate().getRealmByName(name);
            if (model == null) return null;
            if (realmInvalidations.contains(model.getId())) return model;
            cached = new CachedRealm(cache, this, model);
            cache.addCachedRealm(cached);
        } else if (realmInvalidations.contains(cached.getId())) {
            return getDelegate().getRealmByName(name);
        } else if (managedRealms.containsKey(cached.getId())) {
            return managedRealms.get(cached.getId());
        }
        RealmAdapter adapter = new RealmAdapter(cached, this);
        managedRealms.put(cached.getId(), adapter);
        return adapter;
    }

    @Override
    public UserModel getUserById(String id, RealmModel realm) {
        CachedUser cached = cache.getCachedUser(id);
        if (cached == null) {
            UserModel model = getDelegate().getUserById(id, realm);
            if (model == null) return null;
            if (userInvalidations.contains(id)) return model;
            cached = new CachedUser(realm, model);
            cache.addCachedUser(cached);
        } else if (userInvalidations.contains(id)) {
            return getDelegate().getUserById(id, realm);
        } else if (managedUsers.containsKey(id)) {
            return managedUsers.get(id);
        }
        UserAdapter adapter = new UserAdapter(cached, cache, this, realm);
        managedUsers.put(id, adapter);
        return adapter;
    }

    @Override
    public UserModel getUserByUsername(String username, RealmModel realm) {
        CachedUser cached = cache.getCachedUserByUsername(username, realm);
        if (cached == null) {
            UserModel model = getDelegate().getUserByUsername(username, realm);
            if (model == null) return null;
            if (userInvalidations.contains(model.getId())) return model;
            cached = new CachedUser(realm, model);
            cache.addCachedUser(cached);
        } else if (userInvalidations.contains(cached.getId())) {
            return getDelegate().getUserById(cached.getId(), realm);
        } else if (managedUsers.containsKey(cached.getId())) {
            return managedUsers.get(cached.getId());
        }
        UserAdapter adapter = new UserAdapter(cached, cache, this, realm);
        managedUsers.put(cached.getId(), adapter);
        return adapter;
    }

    @Override
    public UserModel getUserByEmail(String email, RealmModel realm) {
        CachedUser cached = cache.getCachedUserByEmail(email, realm);
        if (cached == null) {
            UserModel model = getDelegate().getUserByEmail(email, realm);
            if (model == null) return null;
            if (userInvalidations.contains(model.getId())) return model;
            cached = new CachedUser(realm, model);
            cache.addCachedUser(cached);
        } else if (userInvalidations.contains(cached.getId())) {
            return getDelegate().getUserByEmail(email, realm);
        } else if (managedUsers.containsKey(cached.getId())) {
            return managedUsers.get(cached.getId());
        }
        UserAdapter adapter = new UserAdapter(cached, cache, this, realm);
        managedUsers.put(cached.getId(), adapter);
        return adapter;
    }

    @Override
    public List<RealmModel> getRealms() {
        // we don't cache this for now
        return getDelegate().getRealms();
    }

    @Override
    public boolean removeRealm(String id) {
        cache.invalidateCachedRealmById(id);
        boolean didIt = getDelegate().removeRealm(id);
        realmInvalidations.add(id);

        return didIt;
    }

    @Override
    public void removeAllData() {
        cache.clear();
        getDelegate().removeAllData();
        clearAll = true;
    }

    @Override
    public void close() {
        if (delegate != null) delegate.close();
    }

    @Override
    public UserModel getUserBySocialLink(SocialLinkModel socialLink, RealmModel realm) {
        return getDelegate().getUserBySocialLink(socialLink, realm);
    }

    @Override
    public List<UserModel> getUsers(RealmModel realm) {
        return getDelegate().getUsers(realm);
    }

    @Override
    public List<UserModel> searchForUser(String search, RealmModel realm) {
        return getDelegate().searchForUser(search, realm);
    }

    @Override
    public List<UserModel> searchForUserByAttributes(Map<String, String> attributes, RealmModel realm) {
        return getDelegate().searchForUserByAttributes(attributes, realm);
    }

    @Override
    public Set<SocialLinkModel> getSocialLinks(UserModel user, RealmModel realm) {
        return getDelegate().getSocialLinks(user, realm);
    }

    @Override
    public SocialLinkModel getSocialLink(UserModel user, String socialProvider, RealmModel realm) {
        return getDelegate().getSocialLink(user, socialProvider, realm);
    }

    @Override
    public RoleModel getRoleById(String id, RealmModel realm) {
        CachedRole cached = cache.getRole(id);
        if (cached == null) {
            RoleModel model = getDelegate().getRoleById(id, realm);
            if (model == null) return null;
            if (roleInvalidations.contains(id)) return model;
            if (model.getContainer() instanceof ApplicationModel) {
                cached = new CachedApplicationRole(((ApplicationModel) model.getContainer()).getId(), model);
            } else {
                cached = new CachedRealmRole(model);
            }
            cache.addCachedRole(cached);

        } else if (roleInvalidations.contains(id)) {
            return getDelegate().getRoleById(id, realm);
        } else if (managedRoles.containsKey(id)) {
            return managedRoles.get(id);
        }
        RoleAdapter adapter = new RoleAdapter(cached, cache, this, realm);
        managedRoles.put(id, adapter);
        return adapter;
    }

    @Override
    public ApplicationModel getApplicationById(String id, RealmModel realm) {
        CachedApplication cached = cache.getApplication(id);
        if (cached == null) {
            ApplicationModel model = getDelegate().getApplicationById(id, realm);
            if (model == null) return null;
            if (appInvalidations.contains(id)) return model;
            cached = new CachedApplication(cache, getDelegate(), realm, model);
            cache.addCachedApplication(cached);
        } else if (appInvalidations.contains(id)) {
            return getDelegate().getApplicationById(id, realm);
        } else if (managedApplications.containsKey(id)) {
            return managedApplications.get(id);
        }
        ApplicationAdapter adapter = new ApplicationAdapter(realm, cached, this, cache);
        managedApplications.put(id, adapter);
        return adapter;
    }

    @Override
    public OAuthClientModel getOAuthClientById(String id, RealmModel realm) {
        CachedOAuthClient cached = cache.getOAuthClient(id);
        if (cached == null) {
            OAuthClientModel model = getDelegate().getOAuthClientById(id, realm);
            if (model == null) return null;
            if (clientInvalidations.contains(id)) return model;
            cached = new CachedOAuthClient(cache, getDelegate(), realm, model);
            cache.addCachedOAuthClient(cached);
        } else if (clientInvalidations.contains(id)) {
            return getDelegate().getOAuthClientById(id, realm);
        } else if (managedClients.containsKey(id)) {
            return managedClients.get(id);
        }
        OAuthClientAdapter adapter = new OAuthClientAdapter(realm, cached, this, cache);
        managedClients.put(id, adapter);
        return adapter;
    }

    @Override
    public UsernameLoginFailureModel getUserLoginFailure(String username, RealmModel realm) {
        return getDelegate().getUserLoginFailure(username, realm);
    }

    @Override
    public UsernameLoginFailureModel addUserLoginFailure(String username, RealmModel realm) {
        return getDelegate().addUserLoginFailure(username, realm);
    }

    @Override
    public List<UsernameLoginFailureModel> getAllUserLoginFailures(RealmModel realm) {
        return getDelegate().getAllUserLoginFailures(realm);
    }

    @Override
    public UserSessionModel createUserSession(RealmModel realm, UserModel user, String ipAddress) {
        return getDelegate().createUserSession(realm, user, ipAddress);
    }

    @Override
    public UserSessionModel getUserSession(String id, RealmModel realm) {
        return getDelegate().getUserSession(id, realm);
    }

    @Override
    public List<UserSessionModel> getUserSessions(UserModel user, RealmModel realm) {
        return getDelegate().getUserSessions(user, realm);
    }

    @Override
    public Set<UserSessionModel> getUserSessions(RealmModel realm, ClientModel client) {
        return getDelegate().getUserSessions(realm, client);
    }

    @Override
    public int getActiveUserSessions(RealmModel realm, ClientModel client) {
        return getDelegate().getActiveUserSessions(realm, client);
    }

    @Override
    public void removeUserSession(UserSessionModel session) {
        getDelegate().removeUserSession(session);
    }

    @Override
    public void removeUserSessions(RealmModel realm, UserModel user) {
        getDelegate().removeUserSessions(realm, user);
    }

    @Override
    public void removeExpiredUserSessions(RealmModel realm) {
        getDelegate().removeExpiredUserSessions(realm);
    }

    @Override
    public void removeUserSessions(RealmModel realm) {
        getDelegate().removeUserSessions(realm);
    }
}
