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//
// Copyright 2017 Filippo "Fil" Bergamo <fil.bergamo@riseup.net>
// 
// This file is part of RepWifiApp.
//
// RepWifiApp 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
// (at your option) any later version.
// 
// RepWifiApp 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 RepWifiApp.  If not, see <http://www.gnu.org/licenses/>.
// 
// ********************************************************************

package fil.libre.repwifiapp.helpers;

import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Enumeration;
import fil.libre.repwifiapp.Commons;

public abstract class Engine implements IEngine {

    protected String getCmdWpaSup() {
        return "wpa_supplicant -B -dd -i" + Commons.INTERFACE_NAME + " -C" + Commons.SOCKET_DIR
                        + " -P" + Commons.PID_FILE + " -I" + Commons.OVERLAY_FILE + " -e"
                        + Commons.ENTROPY_FILE;
    }

    protected String getCmdWpaCli() {
        return "wpa_cli -p" + Commons.SOCKET_DIR + " -P" + Commons.PID_FILE + " -i"
                        + Commons.INTERFACE_NAME;
    }

    protected abstract String getCmdWpaStart();

    public boolean deleteFileIfExists(String filePath) {

        if (filePath == null) {
            return false;
        }

        if (filePath.contains("*")) {
            // it's safer to reject bulk rm'ing
            return false;
        }

        if (filePath.contains(" -r ")) {
            // only file rm'ing acceppted
            return false;
        }

        // needs root (it only gets used by the 4p2 engine, working in
        // /data/misc/wifi)
        return executeRootCmd("if [ -e \"" + filePath + "\" ]; then rm \"" + filePath + "\"; fi");

    }

    public boolean chmodFile(String filePath, String mod) {
        // needs root (chmod)
        return executeRootCmd("chmod " + mod + " \"" + filePath + "\"");
    }

    @Override
    public boolean killBackEndProcesses() {

        // needs root (for killall)

        Utils.logDebug("killing wpa_supplicant..:");
        if (executeRootCmd("killall -SIGINT wpa_supplicant")) {
            Utils.logDebug("Killed wpa_supplicant");
        } else {
            Utils.logDebug("Wpa_supplicant NOT killed.");
        }

        Utils.logDebug("killing dhcpcd..");
        if (executeRootCmd("killall -SIGINT dhcpcd")) {
            Utils.logDebug("Killed dhcpcd");
        } else {
            Utils.logDebug("dhcpcd NOT killed.");
        }

        return true;

    }

    @Override
    public boolean clearWorkingDir() {

        // needs root (to work within /data/misc/wifi)

        Utils.logDebug("clearWorkingDir():");

        if (executeRootCmd("rm -r " + Commons.SOCKET_DIR)) {
            Utils.logDebug("removed socket dir");
        }

        if (executeRootCmd("rm " + Commons.ENTROPY_FILE)) {
            Utils.logDebug("removed entropy file");
        }

        if (executeRootCmd("rm " + Commons.PID_FILE)) {
            Utils.logDebug("removed pidfile");
        }

        if (executeRootCmd("rm " + Commons.SOFTAP_FILE)) {
            Utils.logDebug("removed softap file");
        }

        if (executeRootCmd("rm " + Commons.WPA_CONF)) {
            Utils.logDebug("removed wpa conf file");
        }

        if (executeRootCmd("rm " + Commons.P2P_CONF)) {
            Utils.logDebug("removed p2p conf file");
        }

        return true;

    }

    @Override
    public boolean startWpaSupplicant() {

        Utils.logDebug("startWpaSupplicant():");

        // needs root (for wpa_supplicant)
        if (executeRootCmd(getCmdWpaSup())) {
            return true;
        } else {
            Utils.logDebug("Failed to start wpa");
            return false;
        }

    }

    @Override
    public AccessPointInfo[] getAvailableNetworks() {

        Utils.logDebug("getAvailableNetworks():");

        // killPreviousConnections();

        // Is it really necessary???
        // seems that clearing /data/misc/wifi is NOT necessary
        // so, commented out - Fil 2017-03-24
        /*
         * if (! clearWorkingDir()){ Utils.logError("Failed clearing dir");
         * return null; }
         */

        if (!startWpaSupplicant()) {
            Utils.logError("Failed starting wpa_supplicant");
            return null;
        }

        if (!createScanScripts()) {
            Utils.logError("Failed creating scripts");
            return null;
        }

        if (!scanNetworks()) {
            Utils.logError("failed scanning networks");
            return null;
        }

        if (!getScanResults()) {
            Utils.logError("failed getting scan results");
            return null;
        }

        // chmod 664 scan_file to make it readable
        /*
         * if (!chmodFile(Commons.getScanFile(), "664")){
         * Utils.logError("failed chmodding scan_file"); return null; }
         */

        AccessPointInfo[] a = AccessPointInfo.parseScanResult(Commons.getScanFile());
        if (a == null) {
            Utils.logError("Unable to parse scan file into AccessPointInfo array");
            return a;
        }

        Utils.logDebug("# of APs found: " + a.length);

        return a;

    }

    @Override
    public abstract boolean connect(AccessPointInfo info);

    @Override
    public boolean disconnect() {

        // needs root (for wpa_cli)

        if (!isWpaSupplicantRunning()) {
            return true;
        }

        try {

            RootCommand su = new RootCommand(getCmdWpaCli() + " disconnect");
            if (su.execute() == 0) {
                String out = su.getOutput();
                if (out != null && out.trim().replace("\n", "").equals("OK")) {
                    return true;
                } else {
                    return false;
                }
            } else {
                return false;
            }

        } catch (Exception e) {
            Utils.logError("Error while enabling network", e);
            return false;
        }
    }

    /***
     * returns null if unable to determine connection status for any reason.
     */
    @Override
    public ConnectionStatus getConnectionStatus() {

        Utils.logDebug("called getConnecitonStatus()");
        if (!isWpaSupplicantRunning()) {
            // wpa_supplicant is not running.
            // unable to determin status.
            Utils.logDebug("wpa not running, cannot get connection status.");
            return null;

        }

        try {

            RootCommand su = new RootCommand(getCmdWpaCli() + " status");
            if (su.execute() == 0) {
                String out = su.getOutput();
                if (out == null || out.trim().equals("")) {
                    return null;
                } else {
                    return ConnectionStatus.parseWpaCliOutput(out);
                }
            } else {
                return null;
            }

        } catch (Exception e) {
            Utils.logError("Error while executing wpa_cli status", e);
            return null;
        }

    }

    @Override
    public boolean isInterfaceAvailable(String ifaceName) throws SocketException {

        /*
         * String[]ifaces = getAvailableInterfaces(); if(ifaces == null ||
         * ifaces.length == 0){ return false; }
         * 
         * for(String name : ifaces){
         * 
         * if (name.equals(ifaceName)){ return true; } }
         * 
         * return false;
         */

        Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
        while (interfaces.hasMoreElements()) {
            NetworkInterface nif = interfaces.nextElement();
            String nm = nif.getName();
            if (nm.equals(ifaceName)) {
                return true;
            }
        }
        return false;

    }

    @Override
    public String[] getAvailableInterfaces() {

        try {

            // No need for root for "ip link"
            // tested 2017-03-24 - Fil
            ShellCommand cmd = new ShellCommand("ip link");
            if (cmd.execute() == 0) {

                String out = cmd.getOutput();
                if (out == null || out.contains("\n") == false) {
                    Utils.logDebug("No out from ip link");
                    return null;
                }

                ArrayList<String> list = new ArrayList<String>();

                String[] lines = out.split("\n");
                for (String l : lines) {

                    String[] fields = l.split(":");
                    if (fields.length != 3) {
                        continue;
                    }

                    String interfName = fields[1].trim();
                    list.add(interfName);

                }

                String[] retArr = new String[list.size()];
                retArr = list.toArray(retArr);

                return retArr;

            } else {
                return null;
            }

        } catch (Exception e) {
            Utils.logError("Error while querying ip link", e);
            return null;
        }

    }

    public boolean runDhcpcd() {

        // needs root
        return executeRootCmd("dhcpcd " + Commons.INTERFACE_NAME);

    }

    public boolean interfaceUp() {
        // needs root (tested)
        return executeRootCmd("ifconfig " + Commons.INTERFACE_NAME + " up");
    }

    /*
     * protected boolean executeCmd(String cmd){
     * 
     * try {
     * 
     * ShellCommand c = new ShellCommand(cmd); if ( c.execute() == 0){ return
     * true; }else { return false; }
     * 
     * } catch (Exception e) { Utils.logError("Error executing \"" + cmd +
     * "\"",e); return false; }
     * 
     * }
     */

    protected boolean executeRootCmd(String cmd) {

        try {

            RootCommand c = new RootCommand(cmd);
            if (c.execute() == 0) {
                return true;
            } else {
                return false;
            }

        } catch (Exception e) {
            Utils.logError("Error executing \"" + cmd + "\"", e);
            return false;
        }
    }

    protected boolean isWpaSupplicantRunning() {

        boolean retval = false;

        try {

            RootCommand su = new RootCommand("pidof wpa_supplicant");
            if (su.execute() == 0) {

                if (su.getOutput().trim().equals("")) {
                    retval = false;
                } else {
                    retval = true;
                }

            } else {
                retval = false;
            }

        } catch (Exception e) {
            Utils.logError("Exception during isWpaSupplicantRunning()", e);
            retval = false;
        }

        return retval;

    }

    protected boolean scanNetworks() {

        // needs root (for wpa_supplicant and wpa_cli)
        return executeRootCmd("bash " + Commons.getScriptScan());

    }

    protected boolean getScanResults() {

        // needs root (for wpa_supplicant and wpa_cli)
        boolean res = executeRootCmd("bash " + Commons.getScriptScanRes());
        if (!res) {
            return false;
        }
        return res;

    }

    protected boolean createScanScripts() {

        try {

            String scan = getCmdWpaCli() + " scan\n" + "if [ $? -ne 0 ]; then\n" + "exit 1\n"
                            + "fi\n" + "sleep 2s\n";

            String scanRes = "if [ -e \"" + Commons.getScanFile() + "\" ]; then\n" + "	rm \""
                            + Commons.getScanFile() + "\"\n" + "fi\n" + getCmdWpaCli()
                            + " scan_results > \"" + Commons.getScanFile() + "\"\n"
                            + "if [ $? -ne 0 ]; then\n" + "	exit 1\n" + "fi\n";

            if (!Utils.writeFile(Commons.getScriptScan(), scan, true)) {

                Exception e = Utils.getLastException();
                if (e != null) {
                    Utils.logError("Error while writing scan script.", e);
                }

                return false;
            }

            if (!Utils.writeFile(Commons.getScriptScanRes(), scanRes, true)) {

                Exception e = Utils.getLastException();
                if (e != null) {
                    Utils.logError("Error while writing getScanResults script.", e);
                }

                return false;
            }

            return true;

        } catch (Exception e) {

            Utils.logError("Error while creating the scanning script.", e);
            return false;
        }

    }

}