package de.tudarmstadt.informatik.hostage.sync;

/**
 * Created by Julien on 08.12.2014.
 */

import java.net.ServerSocket;
import java.util.ArrayList;
import java.util.List;

import de.tudarmstadt.informatik.hostage.logging.NetworkRecord;
import de.tudarmstadt.informatik.hostage.logging.SyncDevice;
import de.tudarmstadt.informatik.hostage.logging.SyncRecord;
import de.tudarmstadt.informatik.hostage.persistence.HostageDBOpenHelper;
import de.tudarmstadt.informatik.hostage.system.Device;


public class Synchronizer {

    private HostageDBOpenHelper  dbh;

    public Synchronizer(HostageDBOpenHelper dbh){
        super();
        this.dbh = dbh;
    }

    /**
     *
     * Update Idea:
     * PullDevices
     * PullNetworks
     * PullAttacks
     *
     * Commit Idea:
     * PushDevice
     * PushNetworks
     * PushAttacks
     *
     */

    /***
     *
     *  PULL METHODS
     *
     *
     */

    /**
     * Get a list of missing network records from the other device.
     * @param serverSocket server socket
     */
    public void pullNetworks(ServerSocket serverSocket){
        ArrayList<String> myNetworks = this.dbh.getAllBSSIDS();

        ArrayList<NetworkRecord> others = this.getOtherNetworkInformation(serverSocket, myNetworks);
        if (others != null && others.size() > 0){
            this.dbh.updateNetworkInformation(others);
        }
    }

    /**
     * Get a list of missing devices from the other device.
     * @param serverSocket server socket
     */
    public void pullNewDevices(ServerSocket serverSocket){
        ArrayList<String> myDevices = this.dbh.getAllDevicesIds();
        ArrayList<String> otherDeviceIds = this.getOtherDevices(serverSocket, myDevices);

        if (otherDeviceIds != null){
            ArrayList<SyncDevice> otherDevices = new ArrayList<SyncDevice>();

            for (String deviceId : otherDeviceIds){
                SyncDevice device = new SyncDevice();
                device.setDeviceID(deviceId);
                device.setHighest_attack_id(-1);
                device.setLast_sync_timestamp(0);
                otherDevices.add(device);
            }

            if (otherDevices.size() > 0)
                this.dbh.updateSyncDevices(otherDevices);
        }
    }

    /**
     * Get all missing sync records from the other device.
     * @param serverSocket server socket
     */
    public void pullAttacks(ServerSocket serverSocket){
        ArrayList<SyncDevice> myState = this.dbh.getSyncDevices();

        ArrayList<SyncRecord> updates = this.getChanges(serverSocket, myState);

        if (updates != null && updates.size() > 0)
            this.dbh.insertSyncRecords(updates);
    }

    /**
     * Sends own devices ids and parses a list of missing device ids.
     * @param serverSocket server socket
     * @param ownDevices own device ids
     * @return list of missing device ids
     */
    private ArrayList<String> getOtherDevices(ServerSocket serverSocket, ArrayList<String> ownDevices){
        // TODO parse other device ids from in put stream here
        return null;
    }

    /**
     * Sends all network bssids to the  other devices and parses all missing network records.
     * @param serverSocket server socket
     * @param records network bssids
     * @return list of missing networks
     */
    private ArrayList<NetworkRecord> getOtherNetworkInformation(ServerSocket serverSocket, List<String> records){
        // TODO Parse missing network records from input stream here
        return null;
    }

    /**
     * Sends the own state to the other device and parses the answer.
     * @param serverSocket server socket
     * @param ownState our state
     * @return list of unsynced sync records
     */
    private ArrayList<SyncRecord> getChanges(ServerSocket serverSocket, ArrayList<SyncDevice> ownState){
        // TODO Parse unsynced sync records from in put stream here
        return null;
    }


    /**
    *
    *  PUSH METHODS
    *
    *
    * */

    /**
     * Parses an array of device id strings and sends all missing sync devices ids.
     * @param serverSocket server socket
     */
    public void pushDeviceIds(ServerSocket serverSocket){

        // TODO parse other device ids from input stream here
        ArrayList<String> otherIDs = null;


        if (otherIDs != null){
            ArrayList<String> missingIds = this.dbh.getMissingDeviceIds(otherIDs);
            this.sendMissingDeviceIds(serverSocket, missingIds);
        }
    }

    /**
     * Parses an array of sync devices and sends the all unsynced records.
     * @param serverSocket server socket
     */
    public void pushUnsyncedRecords(ServerSocket serverSocket){

        // TODO parse other sync devices from input stream here
        ArrayList<SyncDevice> otherDeviceState = null;

        if (otherDeviceState != null){
            ArrayList<SyncRecord> unsynced = this.dbh.getUnsyncedAttacksFor(otherDeviceState, false);
            this.sendUnsyncedRecords(serverSocket, unsynced);
        }
    }

    /**
     * Parses an array of bssid strings and sends all missing network records.
     * @param serverSocket server socket
     */
    public void pushNetworkInformation(ServerSocket serverSocket){

        // TODO parse other bssids from input stream
        ArrayList<String> otherBSSIDs = null;


        if (otherBSSIDs != null){
            ArrayList<NetworkRecord> missings = this.dbh.getMissingNetworkRecords(otherBSSIDs);
            this.sendMissingNetworkRecords(serverSocket, missings);
        }
    }

    /**
     * Sends all missing network records over an object output stream.
     * @param serverSocket server socket
     * @param n missing network information
     */
    private void sendMissingNetworkRecords(ServerSocket serverSocket, ArrayList<NetworkRecord> n){
        // TODO make output stream here
    }

    /**
     * Sends all missing device ids over an object output stream
     * @param serverSocket server socket
     * @param missingIds all missing device ids
     */
    private void sendMissingDeviceIds(ServerSocket serverSocket, ArrayList<String> missingIds){
        // TODO make output stream here
    }

    /**
     * Sends all unsynced sync records over an object output stream
     * @param serverSocket server socket
     * @param unsynced array of unsynced sync records
     */
    private void sendUnsyncedRecords(ServerSocket serverSocket, ArrayList<SyncRecord> unsynced){
        // TODO make output stream here
    }


}