/**
 * ============LICENSE_START====================================================
 * org.onap.aaf
 * ===========================================================================
 * Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
 * ===========================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============LICENSE_END====================================================
 *
 */

package org.onap.aaf.cadi.aaf.v2_0;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.ConnectException;
import java.net.URISyntaxException;
import java.security.Principal;
import java.util.Map;

import org.onap.aaf.cadi.AbsUserCache;
import org.onap.aaf.cadi.Access;
import org.onap.aaf.cadi.Access.Level;
import org.onap.aaf.cadi.CachedPrincipal.Resp;
import org.onap.aaf.cadi.CadiException;
import org.onap.aaf.cadi.Lur;
import org.onap.aaf.cadi.Permission;
import org.onap.aaf.cadi.User;
import org.onap.aaf.cadi.aaf.AAFPermission;
import org.onap.aaf.cadi.client.Future;
import org.onap.aaf.cadi.client.Rcli;
import org.onap.aaf.cadi.client.Retryable;
import org.onap.aaf.cadi.config.Config;
import org.onap.aaf.cadi.lur.LocalPermission;
import org.onap.aaf.cadi.util.Holder;
import org.onap.aaf.cadi.util.Timing;
import org.onap.aaf.misc.env.APIException;
import org.onap.aaf.misc.env.util.Split;

import aaf.v2_0.Perm;
import aaf.v2_0.Perms;

/**
 * Use AAF Service as Permission Service.
 *
 * This Lur goes after AAF Permissions, which are elements of Roles, not the Roles themselves.
 *
 * If you want a simple Role Lur, use AAFRoleLur
 *
 * @author Jonathan
 *
 */
public class AAFLurPerm extends AbsAAFLur<AAFPermission> {
    private static final String ORG_ONAP_AAF_CADI_OAUTH_OAUTH_2_LUR = "org.onap.aaf.cadi.oauth.OAuth2Lur";

    /**
     *  Need to be able to transmutate a Principal into either Person or AppID, which are the only ones accepted at this
     *  point by AAF.  There is no "domain", aka, no "@att.com" in "ab1234@att.com".
     *
     *  The only thing that matters here for AAF is that we don't waste calls with IDs that obviously aren't valid.
     *  Thus, we validate that the ID portion follows the rules before we waste time accessing AAF remotely
     * @throws APIException
     * @throws URISyntaxException
     * @throws DME2Exception
     */
    // Package on purpose
    AAFLurPerm(AAFCon<?> con) throws CadiException, APIException {
        super(con);
        attachOAuth2(con);
    }

    // Package on purpose
    AAFLurPerm(AAFCon<?> con, AbsUserCache<AAFPermission> auc) throws APIException {
        super(con,auc);
        attachOAuth2(con);
    }

    private void attachOAuth2(AAFCon<?> con) throws APIException {
        String oauth2_url;
        Class<?> tmcls = Config.loadClass(access,"org.onap.aaf.cadi.oauth.TokenMgr");
        if (tmcls!=null) {
            if ((oauth2_url = con.access.getProperty(Config.CADI_OAUTH2_URL,null))!=null) {
                try {
                    Constructor<?> tmconst = tmcls.getConstructor(AAFCon.class,String.class);
                    Object tokMangr = tmconst.newInstance(con,oauth2_url);
                    @SuppressWarnings("unchecked")
                    Class<Lur> oa2cls = (Class<Lur>)Config.loadClass(access, ORG_ONAP_AAF_CADI_OAUTH_OAUTH_2_LUR);
                    Constructor<Lur> oa2const = oa2cls.getConstructor(tmcls);
                    Lur oa2 = oa2const.newInstance(tokMangr);
                    setPreemptiveLur(oa2);
                } catch (NoSuchMethodException | SecurityException | InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
                    throw new APIException(e);
                }
            } else {
                access.log(Level.INIT, "Both cadi-oauth jar and Property",Config.CADI_OAUTH2_URL,"is required to initialize OAuth2");
            }
        }
    }

    protected User<AAFPermission> loadUser(final Principal principal)  {
        final String name = principal.getName();
        final long start = System.nanoTime();
        final Holder<Float> remote = new Holder<Float>(0f);

        final boolean[] success = new boolean[]{false};

        try {
            return aaf.best(new Retryable<User<AAFPermission>>() {
                @Override
                public User<AAFPermission> code(Rcli<?> client) throws CadiException, ConnectException, APIException {
                    final long remoteStart = System.nanoTime();
                    StringBuilder sb = new StringBuilder("/authz/perms/user/");
                    sb.append(name);
                    if(details) {
                        sb.append("?force");
                    }
                    Future<Perms> fp = client.read(sb.toString(),aaf.permsDF);

                    // In the meantime, lookup User, create if necessary
                    User<AAFPermission> user = getUser(principal);
                    Principal p;
                    if (user!=null && user.principal == null) {
                        p = new Principal() {// Create a holder for lookups
                            private String n = name;
                            public String getName() {
                                return n;
                            }
                        };
                    } else {
                        p = principal;
                    }

                    if (user==null) {
                        addUser(user = new User<AAFPermission>(p,aaf.userExpires)); // no password
                    }

                    // OK, done all we can, now get content
                    boolean ok = fp.get(aaf.timeout);
                    remote.set(Timing.millis(remoteStart));
                    if (ok) {
                        success[0]=true;
                        Map<String, Permission> newMap = user.newMap();
                        boolean willLog = aaf.access.willLog(Level.DEBUG);
                        for (Perm perm : fp.value.getPerm()) {
                            user.add(newMap,new AAFPermission(perm.getNs(),perm.getType(),perm.getInstance(),perm.getAction(),perm.getRoles()));
                            if (willLog) {
                                aaf.access.log(Level.DEBUG, name,"has '",perm.getType(),'|',perm.getInstance(),'|',perm.getAction(),'\'');
                            }
                        }
                        user.setMap(newMap);
                    } else {
                        int code;
                        switch(code=fp.code()) {
                            case 401:
                                aaf.access.log(Access.Level.ERROR, code, "Unauthorized to make AAF calls");
                                break;
                            case 404:
                                user.setNoPerms();
                                break;
                            default:
                                aaf.access.log(Access.Level.ERROR, code, fp.body());
                        }
                    }

                    return user;
                }
            });
        } catch (Exception e) {
            aaf.access.log(e,"Calling","/authz/perms/user/"+name);
            success[0]=false;
            return null;
        } finally {
            aaf.access.printf(Level.INFO, "AAFLurPerm: %s %s perms from AAF in %f ms, remote=%f",
                    (success[0]?"Loaded":"Load Failure"),name,Timing.millis(start),remote.get());
        }
    }

    public Resp reload(final User<AAFPermission> user) {
        final String name = user.name;
        long start = System.nanoTime();
        final Holder<Float> remote = new Holder<Float>(0f);
        final Holder<Boolean> success = new Holder<Boolean>(false);
        try {
            Resp rv = aaf.best(new Retryable<Resp>() {
                @Override
                public Resp code(Rcli<?> client) throws CadiException, ConnectException, APIException {
                    final long remoteStart = System.nanoTime();
                    Future<Perms> fp = aaf.client().read(
                            "/authz/perms/user/"+name,
                            aaf.permsDF
                            );

                    // OK, done all we can, now get content
                    boolean ok = fp.get(aaf.timeout);
                    remote.set(Timing.millis(remoteStart));
                    if (ok) {
                        success.set(true);
                        Map<String,Permission> newMap = user.newMap();
                        boolean willLog = aaf.access.willLog(Level.DEBUG);
                        for (Perm perm : fp.value.getPerm()) {
                            user.add(newMap, new AAFPermission(perm.getNs(),perm.getType(),perm.getInstance(),perm.getAction(),perm.getRoles()));
                            if (willLog) {
                                aaf.access.log(Level.DEBUG, name,"has",perm.getType(),perm.getInstance(),perm.getAction());
                            }
                        }
                        user.renewPerm();
                        return Resp.REVALIDATED;
                    } else {
                        int code;
                        switch(code=fp.code()) {
                            case 401:
                                aaf.access.log(Access.Level.ERROR, code, "Unauthorized to make AAF calls");
                                break;
                            default:
                                aaf.access.log(Access.Level.ERROR, code, fp.body());
                        }
                        return Resp.UNVALIDATED;
                    }
                }
            });
            return rv;
        } catch (Exception e) {
            aaf.access.log(e,"Calling","/authz/perms/user/"+name);
            return Resp.INACCESSIBLE;
        } finally {
            aaf.access.printf(Level.INFO, "AAFLurPerm: %s %s perms from AAF in %f ms (remote=%f)",
                    (success.get()?"Reloaded":"Reload Failure"),name,Timing.millis(start),remote.get());
        }
    }

    @Override
    protected boolean isCorrectPermType(Permission pond) {
        return pond instanceof AAFPermission;
    }

    /* (non-Javadoc)
     * @see org.onap.aaf.cadi.Lur#createPerm(java.lang.String)
     */
    @Override
    public Permission createPerm(String p) {
        String[] params = Split.split('|', p);
        switch(params.length) {
            case 3:
                return new AAFPermission(null,params[0],params[1],params[2]);
            case 4:
                return new AAFPermission(params[0],params[1],params[2],params[3]);
            default:
                return new LocalPermission(p);
        }
    }

}