/*
 * Copyright (C) 2008-2017, Juick
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.juick.server.api.webhooks;

import com.github.messenger4j.exception.MessengerVerificationException;
import com.juick.server.MessengerManager;
import com.juick.server.util.HttpForbiddenException;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import springfox.documentation.annotations.ApiIgnore;

import javax.inject.Inject;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;

/**
 * Created by vitalyster on 27.03.2017.
 */
@ApiIgnore
@RestController
public class MessengerWebhook {
    private static Logger logger = LoggerFactory.getLogger(MessengerWebhook.class);

    @Inject
    private MessengerManager messengerManager;

    @RequestMapping(value = "/api/fbwbhk", method = RequestMethod.GET)
    public ResponseEntity<Integer> verifyHook(@RequestParam(name = "hub.mode") String hubMode,
                                               @RequestParam(name = "hub.challenge") Integer hubChallenge,
                                               @RequestParam(name = "hub.verify_token") String verifyToken) {
        if (hubMode.equals("subscribe") && verifyToken.equals(messengerManager.getFacebookVerifyToken())) {
            return new ResponseEntity<>(hubChallenge, HttpStatus.OK);
        }
        throw new HttpForbiddenException();
    }
    @RequestMapping(value = "/api/fbwbhk", method = RequestMethod.POST)
    @ResponseStatus(value = HttpStatus.OK)
    public void processUpdate(@RequestHeader(name = "X-Hub-Signature", required = false) String signature, InputStream body) throws IOException, MessengerVerificationException {
        String data = IOUtils.toString(body, StandardCharsets.UTF_8);
        messengerManager.processUpdate(signature, data);
    }
}