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/*
 * 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;

import com.juick.Message;
import com.juick.Status;
import com.juick.ExternalToken;
import com.juick.User;
import com.juick.model.AnonymousUser;
import com.juick.server.util.HttpBadRequestException;
import com.juick.server.util.HttpForbiddenException;
import com.juick.service.MessagesService;
import com.juick.service.PushQueriesService;
import com.juick.service.SubscriptionService;
import com.juick.server.util.UserUtils;
import com.juick.service.UserService;
import org.springframework.http.MediaType;
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.security.Principal;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

/**
 * Created by vitalyster on 24.10.2016.
 */
@RestController
public class Notifications {

    @Inject
    private PushQueriesService pushQueriesService;
    @Inject
    private MessagesService messagesService;
    @Inject
    private SubscriptionService subscriptionService;
    @Inject
    private UserService userService;


    private User collectTokens(Integer uid) {
        User user = userService.getUserByUID(uid).orElse(AnonymousUser.INSTANCE);
        user.setUnreadCount(messagesService.getUnread(user).size());
        pushQueriesService.getGCMRegID(uid).forEach(t -> user.getTokens().add(new ExternalToken(null, "gcm", t, null)));
        pushQueriesService.getAPNSToken(uid).forEach(t -> user.getTokens().add(new ExternalToken(null, "apns", t, null)));
        pushQueriesService.getMPNSURL(uid).forEach(t -> user.getTokens().add(new ExternalToken(null, "mpns", t, null)));
        return user;
    }

    @ApiIgnore
    @RequestMapping(value = "/api/notifications", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public ResponseEntity<List<User>> doGet(
            @RequestParam(required = false, defaultValue = "0") int uid,
            @RequestParam(required = false, defaultValue = "0") int mid,
            @RequestParam(required = false, defaultValue = "0") int rid) {
        User visitor = UserUtils.getCurrentUser();
        if (visitor.isAnonymous() || !(visitor.getName().equals("juick"))) {
            throw new HttpForbiddenException();
        }
        if (uid > 0 && mid == 0) {
            // PM
            return ResponseEntity.ok(Collections.singletonList(collectTokens(uid)));
        } else {
            if (mid > 0) {
                Message msg = messagesService.getMessage(mid);
                if (msg != null) {
                    List<User> users;
                    if (rid > 0) {
                        Message op = messagesService.getMessage(mid);
                        Message reply = messagesService.getReply(mid, rid);
                        users = subscriptionService.getUsersSubscribedToComments(op, reply);
                    } else {
                        users = subscriptionService.getSubscribedUsers(msg.getUser().getUid(), msg);
                    }

                    return ResponseEntity.ok(users.stream().map(User::getUid)
                            .map(this::collectTokens).collect(Collectors.toList()));
                }
            }
        }
        throw new HttpBadRequestException();
    }

    @ApiIgnore
    @RequestMapping(value = "/api/notifications", method = RequestMethod.DELETE, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public Status doDelete(
            @RequestBody List<ExternalToken> list) {
        User visitor = UserUtils.getCurrentUser();
        // FIXME: it is possible to delete other user's tokens
        if ((visitor.isAnonymous()) || !(visitor.getName().equals("juick"))) {
            throw new HttpForbiddenException();
        }
        list.forEach(t -> {
            switch (t.getType()) {
                case "gcm":
                    pushQueriesService.deleteGCMToken(t.getToken());
                    break;
                case "apns":
                    pushQueriesService.deleteAPNSToken(t.getToken());
                    break;
                case "mpns":
                    pushQueriesService.deleteMPNSToken(t.getToken());
                    break;
                default:
                    throw new HttpBadRequestException();
            }
        });

        return Status.OK;
    }

    @ApiIgnore
    @RequestMapping(value = "/api/notifications", method = RequestMethod.PUT, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public Status doPut(
            @RequestBody List<ExternalToken> list) throws IOException {
        User visitor = UserUtils.getCurrentUser();
        if (visitor.isAnonymous()) {
            throw new HttpForbiddenException();
        }
        list.forEach(t -> {
            switch (t.getType()) {
                case "gcm":
                    pushQueriesService.addGCMToken(visitor.getUid(), t.getToken());
                    break;
                case "apns":
                    pushQueriesService.addAPNSToken(visitor.getUid(), t.getToken());
                    break;
                case "mpns":
                    pushQueriesService.addMPNSToken(visitor.getUid(), t.getToken());
                    break;
                default:
                    throw new HttpBadRequestException();
            }
        });
        return Status.OK;
    }

    @Deprecated
    @RequestMapping(value = "/api/android/register", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public Status doAndroidRegister(
            @RequestParam(name = "regid") String regId) {
        User visitor = UserUtils.getCurrentUser();
        if (visitor.isAnonymous()) {
            throw new HttpForbiddenException();
        }
        pushQueriesService.addGCMToken(visitor.getUid(), regId);
        return Status.OK;
    }

    @Deprecated
    @RequestMapping(value = "/api/android/unregister", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public Status doAndroidUnRegister(@RequestParam(name = "regid") String regId) {
        pushQueriesService.deleteGCMToken(regId);
        return Status.OK;
    }

    @Deprecated
    @RequestMapping(value = "/api/winphone/register", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public Status doWinphoneRegister(
            Principal principal,
            @RequestParam(name = "url") String regId) {
        User visitor = UserUtils.getCurrentUser();
        pushQueriesService.addMPNSToken(visitor.getUid(), regId);
        return Status.OK;
    }

    @Deprecated
    @RequestMapping(value = "/api/winphone/unregister", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public Status doWinphoneUnRegister(@RequestParam(name = "url") String regId) {
        pushQueriesService.deleteMPNSToken(regId);
        return Status.OK;
    }
}