/**
 *  Copyright (C) 2010 Cloud.com, Inc.  All rights reserved.
 * 
 * This software is licensed under the GNU General Public License v3 or later.
 * 
 * It is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */
package com.cloud.resource;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Date;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;

import javax.naming.ConfigurationException;

import org.apache.log4j.Logger;

import com.cloud.agent.IAgentControl;
import com.cloud.agent.api.Answer;
import com.cloud.agent.api.Command;
import com.cloud.agent.api.StartupCommand;
import com.cloud.utils.net.NetUtils;
import com.cloud.utils.script.Script;

public abstract class ServerResourceBase implements ServerResource {
    private static final Logger s_logger = Logger.getLogger(ServerResourceBase.class);
    protected String _name;
    private ArrayList<String> _warnings = new ArrayList<String>();
    private ArrayList<String> _errors = new ArrayList<String>();
    protected NetworkInterface _publicNic;
    protected NetworkInterface _privateNic;
    protected NetworkInterface _storageNic;
    protected NetworkInterface _storageNic2;
    protected IAgentControl _agentControl;

    @Override
    public String getName() {
        return _name;
    }
    
    protected String findScript(String script) {
        return Script.findScript(getDefaultScriptsDir(), script);
    }
    
    protected abstract String getDefaultScriptsDir();

    @Override
    public boolean configure(final String name, final Map<String, Object> params) throws ConfigurationException {
    	_name = name;

        String publicNic = (String)params.get("public.network.device");
        if (publicNic == null) {
        	publicNic = "xenbr1";
        }
        String privateNic = (String)params.get("private.network.device");
        if (privateNic == null) {
        	privateNic = "xenbr0";
        }
        final String storageNic = (String)params.get("storage.network.device");
        final String storageNic2 = (String)params.get("storage.network.device.2");

        _privateNic = getNetworkInterface(privateNic);
        _publicNic = getNetworkInterface(publicNic);
        _storageNic = getNetworkInterface(storageNic);
        _storageNic2 = getNetworkInterface(storageNic2);
        
        if (_privateNic == null) {
            s_logger.error("Nics are not configured!");

			Enumeration<NetworkInterface> nics = null;
            try {
                nics = NetworkInterface.getNetworkInterfaces();
                if (nics == null || !nics.hasMoreElements()) {
                    throw new ConfigurationException("Private NIC is not configured");
                }
            } catch (final SocketException e) {
                throw new ConfigurationException("Private NIC is not configured");
            }

            while (nics.hasMoreElements()) {
                final NetworkInterface nic = nics.nextElement();
                final String nicName = nic.getName();
              //  try {
                    if (//!nic.isLoopback() &&
                        //nic.isUp() &&
                        !nic.isVirtual() &&
                        !nicName.startsWith("vnif") &&
                        !nicName.startsWith("vnbr") &&
                        !nicName.startsWith("peth") &&
                        !nicName.startsWith("vif") &&
                        !nicName.startsWith("virbr") &&
                        !nicName.contains(":")) {
                        final String[] info = NetUtils.getNicParams(nicName);
                        if (info != null && info[0] != null) {
                            _privateNic = nic;
                            s_logger.info("Designating private to be nic " + nicName);
                            break;
                        }
                    }
          //      } catch (final SocketException e) {
            //    	s_logger.warn("Error looking at " + nicName, e);
              //  }
                s_logger.debug("Skipping nic " + nicName);
            }

            if (_privateNic == null) {
                throw new ConfigurationException("Private NIC is not configured");
            }
        }

    	return true;
    }
    
    protected NetworkInterface getNetworkInterface(String nicName) {
    	s_logger.debug("Retrieving network interface: " + nicName);
        if (nicName == null) {
            return null;
        }

        if (nicName.trim().length() == 0) {
            return null;
        }

        nicName = nicName.trim();

        NetworkInterface nic;
        try {
            nic = NetworkInterface.getByName(nicName);
            if (nic == null) {
                s_logger.debug("Unable to get network interface for " + nicName);
                return null;
            }

            return nic;
        } catch (final SocketException e) {
            s_logger.warn("Unable to get network interface for " + nicName, e);
            return null;
        }
    }

    protected void fillNetworkInformation(final StartupCommand cmd) {
        String[] info = null;
        if (_privateNic != null) {
            info = NetUtils.getNetworkParams(_privateNic);
            if (info != null) {
            	if (s_logger.isDebugEnabled()) {
            		s_logger.debug("Parameters for private nic: " + info[0] + " - " + info[1] + "-" + info[2]);
            	}
                cmd.setPrivateIpAddress(info[0]);
                cmd.setPrivateMacAddress(info[1]);
                cmd.setPrivateNetmask(info[2]);
            }
        }

        if (_storageNic != null) {
        	if (s_logger.isDebugEnabled()) {
        		s_logger.debug("Storage has its now nic: " + _storageNic.getName());
        	}
            info = NetUtils.getNetworkParams(_storageNic);
        }

        // NOTE: In case you're wondering, this is not here by mistake.
        if (info != null) {
        	if (s_logger.isDebugEnabled()) {
        		s_logger.debug("Parameters for storage nic: " + info[0] + " - " + info[1] + "-" + info[2]);
        	}
            cmd.setStorageIpAddress(info[0]);
            cmd.setStorageMacAddress(info[1]);
            cmd.setStorageNetmask(info[2]);
        }

        if (_publicNic != null) {
            info = NetUtils.getNetworkParams(_publicNic);
            if (info != null) {
            	if (s_logger.isDebugEnabled()) {
            		s_logger.debug("Parameters for pubic nic: " + info[0] + " - " + info[1] + "-" + info[2]);
            	}
	            cmd.setPublicIpAddress(info[0]);
	            cmd.setPublicMacAddress(info[1]);
	            cmd.setPublicNetmask(info[2]);
            }
        }
        
        if (_storageNic2 != null) {
        	info = NetUtils.getNetworkParams(_storageNic2);
        	if (info != null) {
            	if (s_logger.isDebugEnabled()) {
            		s_logger.debug("Parameters for storage nic 2: " + info[0] + " - " + info[1] + "-" + info[2]);
            	}
        		cmd.setStorageIpAddressDeux(info[0]);
        		cmd.setStorageMacAddressDeux(info[1]);
        		cmd.setStorageNetmaskDeux(info[2]);
        	}
        }
    }

    @Override
    public void disconnected() {
    }
    
    @Override
    public IAgentControl getAgentControl() {
    	return _agentControl; 
    }
    
    @Override
    public void setAgentControl(IAgentControl agentControl) {
    	_agentControl = agentControl;
    }

    protected void recordWarning(final String msg, final Throwable th) {
        final String str = getLogStr(msg, th);
        synchronized(_warnings) {
            _warnings.add(str);
        }
    }

    protected void recordWarning(final String msg) {
        recordWarning(msg, null);
    }

    protected List<String> getWarnings() {
        synchronized(this) {
            final ArrayList<String> results = _warnings;
            _warnings = new ArrayList<String>();
            return results;
        }
    }

    protected List<String> getErrors() {
        synchronized(this) {
            final ArrayList<String> result = _errors;
            _errors = new ArrayList<String>();
            return result;
        }
    }

    protected void recordError(final String msg, final Throwable th) {
        final String str = getLogStr(msg, th);
        synchronized(_errors) {
            _errors.add(str);
        }
    }

    protected void recordError(final String msg) {
        recordError(msg, null);
    }

    protected Answer createErrorAnswer(final Command cmd, final String msg, final Throwable th) {
        final StringWriter writer = new StringWriter();
        if (msg != null) {
            writer.append(msg);
        }
        writer.append("===>Stack<===");
        th.printStackTrace(new PrintWriter(writer));
        return new Answer(cmd, false, writer.toString());
    }

    protected String createErrorDetail(final String msg, final Throwable th) {
        final StringWriter writer = new StringWriter();
        if (msg != null) {
            writer.append(msg);
        }
        writer.append("===>Stack<===");
        th.printStackTrace(new PrintWriter(writer));
        return writer.toString();
    }

    protected String getLogStr(final String msg, final Throwable th) {
        final StringWriter writer = new StringWriter();
        writer.append(new Date().toString()).append(": ").append(msg);
        if (th != null) {
            writer.append("\n  Exception: ");
            th.printStackTrace(new PrintWriter(writer));
        }
        return writer.toString();
    }

    @Override
    public boolean start() {
        return true;
    }

    @Override
    public boolean stop() {
        return true;
    }
}