/*
 * Copyright (c) 2019-2020 GeyserMC. http://geysermc.org
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @author GeyserMC
 * @link https://github.com/GeyserMC/GeyserConnect
 */

package org.geysermc.connect.utils;

import org.geysermc.connector.GeyserConnector;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class WebUtils {
    /**
     * Makes a web request to the given URL and returns the body as a string
     *
     * @param reqURL URL to fetch
     * @return Body contents or error message if the request fails
     */
    public static String getBody(String reqURL) {
        URL url;
        try {
            url = new URL(reqURL);
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            con.setRequestMethod("GET");
            con.setRequestProperty("User-Agent", "Geyser-Connect/" + GeyserConnector.VERSION); // Otherwise Java 8 fails on checking updates

            return connectionToString(con);
        } catch (Exception e) {
            return e.getMessage();
        }
    }

    /**
     * Get the string output from the passed {@link HttpURLConnection}
     *
     * @param con The connection to get the string from
     * @return The body of the returned page
     * @throws IOException If the request fails
     */
    private static String connectionToString(HttpURLConnection con) throws IOException {
        // Send the request (we dont use this but its required for getErrorStream() to work)
        int code = con.getResponseCode();

        // Read the error message if there is one if not just read normally
        InputStream inputStream = con.getErrorStream();
        if (inputStream == null) {
            inputStream = con.getInputStream();
        }

        BufferedReader in = new BufferedReader(new InputStreamReader(inputStream));
        String inputLine;
        StringBuilder content = new StringBuilder();

        while ((inputLine = in.readLine()) != null) {
            content.append(inputLine);
            content.append("\n");
        }

        in.close();
        con.disconnect();

        return content.toString();
    }
}