/**
 * ============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.batch.reports.bodies;

import java.io.File;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Modifier;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

import org.onap.aaf.auth.batch.helpers.LastNotified;
import org.onap.aaf.auth.batch.reports.Notify;
import org.onap.aaf.auth.env.AuthzTrans;
import org.onap.aaf.cadi.Access;
import org.onap.aaf.misc.env.APIException;

public abstract class NotifyBody {
	private static final String DUPL = "<td style=\"text-indent: 4em;\">''</td>";
	private static final Map<String,NotifyBody> bodyMap = new HashMap<>();

	protected Map<String,List<List<String>>> rows;
	protected final String env;
	protected final String gui_url;
	
	private final String name;
	private final String type;
	private String date;
	private int escalation;
	private int count;
	
	public NotifyBody(Access access, final String type, final String name) {
		rows = new TreeMap<>();
		this.name = name;
		this.type = type;
		date="";
		escalation = 1;
		count = 0;
		env = access.getProperty("CASS_ENV","DEVL");
		gui_url = access.getProperty("GUI_URL", "");
	}
	
	public void store(List<String> row) {
		if(!row.isEmpty()) {
			if("info".equals(row.get(0))) {
				if(row.size()>2) {
					date = row.get(2);
				}
				if(row.size()>3) {
					escalation = Integer.parseInt(row.get(3));
				}
				return;
			} else if(type.equals(row.get(0))) {
				String user = user(row);
				if(user!=null) {
					List<List<String>> lss = rows.get(user); 
					if(lss == null) {
						lss = new ArrayList<>();
						rows.put(user,lss);
					}
					lss.add(row);
				}
			}
		}
	}

	public String name() {
		return name;
	}
	
	public String type() {
		return type;
	}
	
	public String date() {
		return date;
	}
	public int escalation() {
		return escalation;
	}
	
	public Set<String> users() {
		return rows.keySet();
	}
	
	/**
	 * ID must be set from Row for Email lookup
	 * 
	 * @param trans
	 * @param n
	 * @param id
	 * @param row
	 * @return
	 */
	public abstract boolean body(AuthzTrans trans, StringBuilder sb, int indent, Notify n, String id);
	
	/**
	 * Return "null" if user not found in row... Code will handle.
	 * @param row
	 * @return
	 */
	protected abstract String user(List<String> row);
	
	/**
	 * Provide a context-sensitive Subject, which includes ENV as well as details
	 * 
	 * @return
	 */
	public abstract String subject();

	/**
	 * Record the fact that a particular Notification was marked as "sent" by Emailer.
	 * 
	 * @param trans
	 * @param approver
	 * @param ln
	 */
	public abstract void record(AuthzTrans trans, StringBuilder query, String id, List<String> notified, LastNotified ln);
	
	/**
	 * Get Notify Body based on key of
	 * type|name
	 */
	public static NotifyBody get(String key) {
		return bodyMap.get(key);
	}
	
	/**
	 * Return set of loaded NotifyBodies
	 * 
	 */
	public static Collection<NotifyBody> getAll() {
		// Note: The same Notify Body is entered several times with different keys.
		// Therefore, need a Set of Values, not all the Values.
		Set<NotifyBody> set = new HashSet<>();
		set.addAll(bodyMap.values());
		return set;
	}
	
	/**
	 * @param propAccess 
	 * @throws URISyntaxException 
	 * 
	 */
	public static void load(Access access) throws APIException, IOException {
		// class load available NotifyBodies
		ClassLoader cl = Thread.currentThread().getContextClassLoader();
		Package pkg = NotifyBody.class.getPackage();
		String path = pkg.getName().replace('.', '/');
		URL url = cl.getResource(path);
		List<String> classNames = new ArrayList<>();
		String urlString = url.toString();
		if(urlString.startsWith("jar:file:")) {
			int exclam = urlString.lastIndexOf('!');
			JarFile jf = new JarFile(urlString.substring(9,exclam));
			try {
				Enumeration<JarEntry> jfe = jf.entries();
				while(jfe.hasMoreElements()) {
					String name = jfe.nextElement().getName();
					if(name.startsWith(path) && name.endsWith(".class")) {
						classNames.add(name.substring(0,name.length()-6).replace('/', '.'));
					}
				}
			} finally {
				jf.close();
			}
		} else {
			File dir = new File(url.getFile());
			for( String f : dir.list()) {
				if(f.endsWith(".class")) {
					classNames.add(pkg.getName()+'.'+f.substring(0,f.length()-6));
				}
			}
		}
		for(String cls : classNames) {
			try {
				Class<?> c = cl.loadClass(cls);
				if(c!=null) {
					if(!Modifier.isAbstract(c.getModifiers())) {
						Constructor<?> cst = c.getConstructor(Access.class);
						NotifyBody nb = (NotifyBody)cst.newInstance(access);
						if(nb!=null) {
							bodyMap.put("info|"+nb.name, nb);
							bodyMap.put(nb.type+'|'+nb.name, nb);
						}
					}
				}
			} catch (ClassNotFoundException | NoSuchMethodException | SecurityException | InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
				e.printStackTrace();
			}
		}
	}

	protected void print(StringBuilder sb, int indent, Object ... objs) {
		for(int i=0;i<indent;++i) {
			sb.append(' ');
		}
		for(Object o : objs) {
			sb.append(o.toString());
		}
	}
			
	protected void println(StringBuilder sb, int indent, Object ... objs) {
		print(sb,indent,objs);
		sb.append('\n');
	}

	protected void printf(StringBuilder sb, int indent, String fmt, Object ... objs) {
		print(sb,indent,String.format(fmt, objs));
	}

	protected String printCell(StringBuilder sb, int indent, String current, String prev) {
		if(current.equals(prev)) {
			println(sb,indent,DUPL);
		} else {
			printCell(sb,indent,current);
		}
		return current; // use to set prev...
	}
	
	protected void printCell(StringBuilder sb, int indent, String current) {
		println(sb,indent,"<td>",current,"</td>");
	}
	
	public synchronized void inc() {
		++count;
	}
	
	public int count() {
		return count;
	}
}