/*
 * Copyright 2017 HomeAdvisor, Inc.
 *
 * 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 com.homeadvisor.kafdrop.controller;

import com.homeadvisor.kafdrop.model.ConsumerVO;
import com.homeadvisor.kafdrop.service.ConsumerNotFoundException;
import com.homeadvisor.kafdrop.service.KafkaMonitor;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiResponse;
import io.swagger.annotations.ApiResponses;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.Optional;

@Controller
@RequestMapping("/consumer")
public class ConsumerController
{
   private final KafkaMonitor kafkaMonitor;

   public ConsumerController(KafkaMonitor kafkaMonitor)
   {
      this.kafkaMonitor = kafkaMonitor;
   }

   @RequestMapping("{groupId:.+}")
   public String consumerDetail(@PathVariable("groupId") String groupId, Model model)
   {
      model.addAttribute("consumer", kafkaMonitor.getConsumer(groupId)
         .orElseThrow(() -> new ConsumerNotFoundException(groupId)));
      return "consumer-detail";
   }

   @RequestMapping("{groupId:.+}/{topic:.+}")
   public String consumerDetail(@PathVariable("groupId") String groupId,
                                @PathVariable("topic") String topic,
                                Model model)
   {

      ConsumerVO consumer = kafkaMonitor.getTopic(topic)
         .flatMap(topicDetail -> kafkaMonitor.getConsumerByTopic(groupId, topicDetail))
         .orElseThrow(() -> new ConsumerNotFoundException(groupId));
      model.addAttribute("consumer", consumer);
      return "consumer-detail";
   }

   @ApiOperation(value = "getConsumer", notes = "Get topic and partition details for a consumer group")
   @ApiResponses(value = {
         @ApiResponse(code = 200, message = "Success", response = ConsumerVO.class),
         @ApiResponse(code = 404, message = "Invalid consumer group")
   })
   @RequestMapping(path = "{groupId:.+}", produces = MediaType.APPLICATION_JSON_VALUE, method = RequestMethod.GET)
   public @ResponseBody ConsumerVO getConsumer(@PathVariable("groupId") String groupId) throws Exception
   {
      final ConsumerVO consumer = kafkaMonitor.getConsumer(groupId)
            .orElseThrow(() -> new ConsumerNotFoundException(groupId));

      return consumer;
   }

}