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/**
 * Copyright (c) 2013 LEAP Encryption Access Project and contributers
 *
 * This program 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.
 *
 * 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 se.leap.bitmaskclient.eip;

import com.google.gson.*;

import org.json.*;

import java.io.*;

import de.blinkt.openvpn.*;
import de.blinkt.openvpn.core.*;

/**
 * Gateway provides objects defining gateways and their metadata.
 * Each instance contains a VpnProfile for OpenVPN specific data and member
 * variables describing capabilities and location (name)
 *
 * @author Sean Leonard <meanderingcode@aetherislands.net>
 * @author Parménides GV <parmegv@sdf.org>
 */
public class Gateway {

    public final static String TAG = Gateway.class.getSimpleName();

    private JSONObject general_configuration;
    private JSONObject secrets;
    private JSONObject gateway;

    private String mName;
    private int timezone;
    private VpnProfile mVpnProfile;

    /**
     * Build a gateway object from a JSON OpenVPN gateway definition in eip-service.json
     * and create a VpnProfile belonging to it.
     */
    public Gateway(JSONObject eip_definition, JSONObject secrets, JSONObject gateway) {

        this.gateway = gateway;
        this.secrets = secrets;

        general_configuration = getGeneralConfiguration(eip_definition);
        timezone = getTimezone(eip_definition);
        mName = locationAsName(eip_definition);

        mVpnProfile = createVPNProfile();
        mVpnProfile.mName = mName;
    }

    private JSONObject getGeneralConfiguration(JSONObject eip_definition) {
        try {
            return eip_definition.getJSONObject("openvpn_configuration");
        } catch (JSONException e) {
            return new JSONObject();
        }
    }

    private int getTimezone(JSONObject eip_definition) {
        JSONObject location = getLocationInfo(eip_definition);
        return location.optInt("timezone");
    }

    private String locationAsName(JSONObject eip_definition) {
        JSONObject location = getLocationInfo(eip_definition);
        return location.optString("name");
    }

    private JSONObject getLocationInfo(JSONObject eip_definition) {
        try {
            JSONObject locations = eip_definition.getJSONObject("locations");

            return locations.getJSONObject(gateway.getString("location"));
        } catch (JSONException e) {
            return new JSONObject();
        }
    }

    /**
     * Create and attach the VpnProfile to our gateway object
     */
    private VpnProfile createVPNProfile() {
        try {
            ConfigParser cp = new ConfigParser();

            VpnConfigGenerator vpn_configuration_generator = new VpnConfigGenerator(general_configuration, secrets, gateway);
            String configuration = vpn_configuration_generator.generate();

            cp.parseConfig(new StringReader(configuration));
            return cp.convertProfile();
        } catch (ConfigParser.ConfigParseError e) {
            // FIXME We didn't get a VpnProfile!  Error handling! and log level
            e.printStackTrace();
            return null;
        } catch (IOException e) {
            // FIXME We didn't get a VpnProfile!  Error handling! and log level
            e.printStackTrace();
            return null;
        }
    }

    public String getName() {
        return mName;
    }

    public VpnProfile getProfile() {
        return mVpnProfile;
    }

    public int getTimezone() {
        return timezone;
    }

    @Override
    public String toString() {
        return new Gson().toJson(this, Gateway.class);
    }
}