/**
 * ============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.dao.cached;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import org.onap.aaf.auth.dao.Cached.Getter;
import org.onap.aaf.auth.dao.cass.CredDAO;
import org.onap.aaf.auth.dao.cass.CredDAO.Data;
import org.onap.aaf.auth.layer.Result;
import org.onap.aaf.cadi.Access;
import org.onap.aaf.cadi.Access.Level;
import org.onap.aaf.cadi.CadiException;
import org.onap.aaf.cadi.Hash;
import org.onap.aaf.cadi.PropAccess;
import org.onap.aaf.cadi.util.CSV;

public class FileGetter {
    private static final String AAF_FILEGETTER = "aaf_filegetter";
    private static boolean isLoaded = false;
    private static FileGetter singleton;
    private static List<CredDAO.Data> EMPTY = new ArrayList<>();
    private Map<String,List<CredDAO.Data>> data;
    private SimpleDateFormat sdf;
    private FileGetter(Access access) {
        if(access!=null) {
            String filename = access.getProperty(AAF_FILEGETTER,null);
            if((filename!=null)&&(!isLoaded)) {
                    data = new TreeMap<>();
                    sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss+SSSS");
                    CSV csv = new CSV(access, filename).setDelimiter('|');
                    try {
                        access.log(Level.INIT, "Loading Filebased Cred from",filename);
                        csv.visit(row -> {
                            if(row.size()<1) {
                                access.log(Level.INIT, "Bad Row");
                            }
                            int type;
                              try {
                                  type =Integer.parseInt(row.get(1));
                              } catch(Exception e) {
                                  access.log(Level.INIT, e, "skipping ", row.get(0));
                                  return;
                              }
                            if(CredDAO.CERT_SHA256_RSA == type) {
                                return;
                            }
                            CredDAO.Data cdd = new CredDAO.Data();
                            cdd.id=row.get(0);
                            cdd.type = type;
                            try {
                                cdd.expires = sdf.parse(row.get(2));
                                cdd.cred = ByteBuffer.wrap(Hash.fromHex(row.get(3)));
                                cdd.notes= row.get(4);
                                cdd.ns = row.get(5);
                                cdd.other = Integer.parseInt(row.get(6));
                                if(row.size()>8) {
                                    cdd.tag = row.get(8);
                                } else {
                                    cdd.tag = "";
                                }
                                List<CredDAO.Data> lcdd = data.get(cdd.id);
                                if(lcdd == null) {
                                    lcdd = new ArrayList<>();
                                    data.put(cdd.id, lcdd);
                                }
                                lcdd.add(cdd);
                            } catch (ParseException e) {
                                access.log(Level.INIT, e);
                            }

                        });
                        access.printf(Level.INIT, "Filebased Cred finished...");
                        isLoaded = true;
                    } catch( CadiException | IOException e) {
                        access.log(Level.ERROR, e);
                    }
            }
        }
    }

    public static synchronized FileGetter singleton(Access access) {
        if(singleton==null) {
            singleton = new FileGetter(access);
        }
        return singleton;
    }

    public Getter<CredDAO.Data> getter(String id) {
        return new FGetter(id);
    }
    
    public class FGetter implements Getter<CredDAO.Data> {
        private final List<CredDAO.Data> lcdd;
        public FGetter(final String id) {
            lcdd = data.get(id);
        }
        @Override
        public Result<List<Data>> get() {
            return Result.ok(lcdd==null?EMPTY:lcdd);
        }
    }

    public static void main(String[] args) {
        PropAccess access = new PropAccess(args);
        access.setProperty(AAF_FILEGETTER,"/opt/app/aaf/data/cred.dat");
        FileGetter fg = FileGetter.singleton(access);

        for(String id : new String[] {"m01891@aaf.att.com","bogus"}) {
            Getter<CredDAO.Data> g = fg.getter(id);
            Result<List<CredDAO.Data>> r = g.get();
            if(r.isOKhasData()) {
                for(CredDAO.Data cdd : r.value) {
                    System.out.println(cdd);
                }
            }
        }
    }

    public static boolean isLoaded() {
        return isLoaded;
    }
}