/**
 * ============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.auth.gui.pages;

import java.io.IOException;
import java.net.ConnectException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.UUID;

import org.onap.aaf.auth.env.AuthzEnv;
import org.onap.aaf.auth.env.AuthzTrans;
import org.onap.aaf.auth.gui.AAF_GUI;
import org.onap.aaf.auth.gui.BreadCrumbs;
import org.onap.aaf.auth.gui.NamedCode;
import org.onap.aaf.auth.gui.Page;
import org.onap.aaf.auth.gui.Table;
import org.onap.aaf.auth.gui.Table.Cells;
import org.onap.aaf.auth.gui.table.AbsCell;
import org.onap.aaf.auth.gui.table.RefCell;
import org.onap.aaf.auth.gui.table.TableData;
import org.onap.aaf.auth.gui.table.TextCell;
import org.onap.aaf.cadi.CadiException;
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.misc.env.APIException;
import org.onap.aaf.misc.env.Env;
import org.onap.aaf.misc.env.Slot;
import org.onap.aaf.misc.env.TimeTaken;
import org.onap.aaf.misc.xgen.Cache;
import org.onap.aaf.misc.xgen.DynamicCode;
import org.onap.aaf.misc.xgen.html.HTMLGen;

import aaf.v2_0.Approval;
import aaf.v2_0.Approvals;

public class PendingRequestsShow extends Page {
    public static final String HREF = "/gui/myrequests";
    public static final String NAME = "MyRequests";
    private static final String[] FIELDS = new String[] {"as_user"}; // as_user Checked in Display
    private static final String AS_USER=NAME+".as_user";
    
    public PendingRequestsShow(final AAF_GUI gui, final Page ... breadcrumbs) throws APIException, IOException {
        super(gui.env, NAME,HREF, FIELDS,
            new BreadCrumbs(breadcrumbs), 
            new TopOfPage(gui.env,true, "expedite"),
            new Table<AAF_GUI,AuthzTrans>("Pending Requests",gui.env.newTransNoAvg(),new Model(gui.env), "class=std")
        );
    }

    private static final class TopOfPage extends NamedCode {
        private Slot sAsUser;

        private TopOfPage(AuthzEnv env, boolean no_cache, String name) {
            super(no_cache, name);
             sAsUser = env.slot(AS_USER);
        }

        @Override
        public void code(final Cache<HTMLGen> cache, final HTMLGen hgen) throws APIException, IOException {
            cache.dynamic(hgen, new DynamicCode<HTMLGen, AAF_GUI, AuthzTrans>() {
                @Override
                public void code(final AAF_GUI gui, final AuthzTrans trans,    final Cache<HTMLGen> cache, final HTMLGen hgen)    throws APIException, IOException {
                    String user = trans.get(sAsUser,null);
                    if(user==null) {
                        user=trans.user();
                    } else {
                        hgen.incr(HTMLGen.H3,"class=center").text("Displaying for " + user).end();
                    }

                    hgen
                        .leaf(HTMLGen.P, "class=expedite_request").text("These are your submitted Requests that are awaiting Approval. ")
                        .br()
                        .text("To Expedite a Request: ")
                        .leaf("a","href=#expedite_directions","onclick=divVisibility('expedite_directions');")
                            .text("Click Here").end()
                        .divID("expedite_directions", "style=display:none");
                    
                    hgen
                        .incr(HTMLGen.OL)
                        .incr(HTMLGen.LI)
                        .leaf("a","href="+ApprovalForm.HREF+"?user="+user, "id=userApprove")
                        .text("Copy This Link")
                        .end()
                        .end()
                        .incr(HTMLGen.LI)
                        .text("Send it to the Approver Listed")
                        .end()
                        .end()
                        .text("NOTE: Using this link, the Approver will only see your requests. You only need to send this link once!")
                        .end()
                        .end();
                }
            });
         }
    }

    /**
     * Implement the Table Content for Requests by User
     * 
     * @author Jeremiah
     *
     */
    private static class Model extends TableData<AAF_GUI,AuthzTrans> {
        final long NUM_100NS_INTERVALS_SINCE_UUID_EPOCH = 0x01b21dd213814000L;
        private final Slot sAsUser;
        private static final String[] headers = new String[] {"Request Date","Status","Memo","Approver"};

        public Model(AuthzEnv env) {
            sAsUser = env.slot(AS_USER);
        }

        @Override
        public String[] headers() {
            return headers;
        }
        
        @Override
        public Cells get(final AuthzTrans trans, final AAF_GUI gui) {
            final ArrayList<AbsCell[]> rv = new ArrayList<>();
            try {
                gui.clientAsUser(trans.getUserPrincipal(), new Retryable<Void>() {
                    @Override
                    public Void code(Rcli<?> client)throws CadiException, ConnectException, APIException {
                        final String user = trans.get(sAsUser,trans.user());

                        TimeTaken tt = trans.start("AAF Get Approvals by User",Env.REMOTE);
                        try {
                            Future<Approvals> fa = client.read("/authz/approval/user/"+user,gui.getDF(Approvals.class));
                            if (fa.get(5000)) {
                                tt.done();
                                tt = trans.start("Load Data", Env.SUB);
                                if (fa.value!=null) {
                                    List<Approval> approvals = fa.value.getApprovals();
                                    Collections.sort(approvals, new Comparator<Approval>() {
                                        @Override
                                        public int compare(Approval a1, Approval a2) {
                                            UUID id1 = UUID.fromString(a1.getId());
                                            UUID id2 = UUID.fromString(a2.getId());
                                            return id1.timestamp()<=id2.timestamp()?1:-1;
                                        }
                                    });
                                    
                                    String prevTicket = null;
                                    for (Approval a : approvals) {
                                        String approver = a.getApprover();
//                                        String approverShort = approver.substring(0,approver.indexOf('@'));
                                        
                                        AbsCell tsCell = null;
                                        String ticket = a.getTicket();
                                        if (ticket==null || ticket.equals(prevTicket)) {
                                            tsCell = AbsCell.Null;
                                        } else {
                                            UUID id = UUID.fromString(a.getId());
                                            // Sonar says SimpleDate should not be static
                                            tsCell = new RefCell(new SimpleDateFormat("yyyy-MM-dd").format((id.timestamp() - NUM_100NS_INTERVALS_SINCE_UUID_EPOCH)/10000),
                                                    RequestDetail.HREF + "?ticket=" + ticket,false);
                                            prevTicket = ticket;
                                        }
                                        
                                        AbsCell approverCell = new TextCell(approver);
                                        AbsCell[] sa = new AbsCell[] {
                                            tsCell,
                                            new TextCell(a.getStatus()),
                                            new TextCell(a.getMemo()),
                                            approverCell
                                        };
                                        rv.add(sa);
                                    }
                                }
                            } else {
                                gui.writeError(trans, fa, null, 0);
                            }
                        } finally {
                            tt.done();
                        }


                        return null;
                    }
                });
            } catch (Exception e) {
                trans.error().log(e);
            }
            return new Cells(rv,null);
        }
    }
}