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/**
 * Copyright (c) 2018 Orange
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 */
package org.onap.nbi.apis.hub;

import java.net.URI;
import java.util.List;
import java.util.stream.Collectors;
import org.onap.nbi.apis.hub.model.Subscriber;
import org.onap.nbi.apis.hub.model.Subscription;
import org.onap.nbi.apis.hub.service.SubscriptionService;
import org.onap.nbi.commons.JsonRepresentation;
import org.onap.nbi.commons.MultiCriteriaRequestBuilder;
import org.onap.nbi.commons.ResourceManagement;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;

@RestController
@RequestMapping("/hub")
@EnableScheduling
public class HubResource extends ResourceManagement {

    Logger logger = LoggerFactory.getLogger(HubResource.class);

    @Autowired
    MongoTemplate mongoTemplate;

    @Autowired
    SubscriptionService subscriptionService;

    @Autowired
    MultiCriteriaRequestBuilder multiCriteriaRequestBuilder;

    @PostMapping(consumes = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<Subscriber> createEventSubscription(@RequestBody Subscription subscription) {
        logger.debug("POST request for subscription : {}", subscription);

        Subscriber subscriber = subscriptionService.createSubscription(subscription);

        URI location = ServletUriComponentsBuilder
            .fromCurrentRequest()
            .path("/{id}")
            .buildAndExpand(subscriber.getId())
            .toUri();

        return ResponseEntity.created(location).build();
    }

    @GetMapping(value = "/{subscriptionId}", produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<Subscription> getSubscription(@PathVariable String subscriptionId) {

        Subscriber subscriber = subscriptionService.findSubscriptionById(subscriptionId);
        if (subscriber == null) {
            return ResponseEntity.notFound().build();
        }
        return ResponseEntity.ok(Subscription.createFromSubscriber(subscriber));
    }

    @GetMapping(value = "", produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<Object> findSubscribers(@RequestParam MultiValueMap<String, String> params) {

        Query query = multiCriteriaRequestBuilder.buildRequest(params);
        List<Subscriber> subscribers = mongoTemplate.find(query, Subscriber.class);
        JsonRepresentation filter = new JsonRepresentation(params);
        long totalCount = subscriptionService.countSubscription();
        HttpHeaders headers = new HttpHeaders();
        headers.add("X-Total-Count", String.valueOf(totalCount));
        headers.add("X-Result-Count", String.valueOf(subscribers.size()));
        List<Subscription> subscriptions = subscribers.stream()
            .map(Subscription::createFromSubscriber)
            .collect(Collectors.toList());

        return this.findResponse(subscriptions, filter, headers);

    }

    @DeleteMapping("/{subscriptionId}")
    @ResponseStatus(HttpStatus.NO_CONTENT)
    public void deleteSubscription(@PathVariable String subscriptionId) {
        logger.debug("DELETE request for subscription id #{}", subscriptionId);
        subscriptionService.deleteSubscription(subscriptionId);
    }
}