/**
 * Copyright (c) 2018 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.providersetup;

import androidx.annotation.NonNull;
import android.util.Pair;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Locale;
import java.util.Scanner;

import de.blinkt.openvpn.core.VpnStatus;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

/**
 * Created by cyberta on 08.01.18.
 */

public class ProviderApiConnector {

    private static final MediaType JSON
            = MediaType.parse("application/json; charset=utf-8");


    public static boolean delete(OkHttpClient okHttpClient, String deleteUrl) {
        try {
            Request.Builder requestBuilder = new Request.Builder()
                    .url(deleteUrl)
                    .delete();
            Request request = requestBuilder.build();

            Response response = okHttpClient.newCall(request).execute();
            //response code 401: already logged out
            if (response.isSuccessful() || response.code() == 401) {
                return true;
            }
        }  catch (IOException | RuntimeException e) {
            return false;
        }

        return false;
    }

    public static boolean canConnect(@NonNull OkHttpClient okHttpClient, String url) throws RuntimeException, IOException {
        Request.Builder requestBuilder = new Request.Builder()
                .url(url)
                .method("GET", null);
        Request request = requestBuilder.build();

        Response response = okHttpClient.newCall(request).execute();
        if (!response.isSuccessful()) {
            VpnStatus.logWarning("[API] API request failed canConnect(): " + url);
        }
        return response.isSuccessful();

    }

    public static String requestStringFromServer(@NonNull String url, @NonNull String request_method, String jsonString, @NonNull List<Pair<String, String>> headerArgs, @NonNull OkHttpClient okHttpClient) throws RuntimeException, IOException {

        RequestBody jsonBody = jsonString != null ? RequestBody.create(JSON, jsonString) : null;
        Request.Builder requestBuilder = new Request.Builder()
                .url(url)
                .method(request_method, jsonBody);
        for (Pair<String, String> keyValPair : headerArgs) {
            requestBuilder.addHeader(keyValPair.first, keyValPair.second);
        }

        //TODO: move to getHeaderArgs()?
        String locale = Locale.getDefault().getLanguage() + Locale.getDefault().getCountry();
        requestBuilder.addHeader("Accept-Language", locale);
        Request request = requestBuilder.build();

        Response response = okHttpClient.newCall(request).execute();
        if (!response.isSuccessful()) {
            VpnStatus.logWarning("[API] API request failed: " + url);
        }

        if (response.body() != null) {
            InputStream inputStream = response.body().byteStream();
            Scanner scanner = new Scanner(inputStream).useDelimiter("\\A");
            if (scanner.hasNext()) {
                String result = scanner.next();
                response.body().close();
                return result;
            }
        }
        return null;
    }
}