// Copyright 2022 PingCAP, 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.pingcap.baresharding.controller;

import com.pingcap.baresharding.repository.GitHubEventsMapper;
import com.pingcap.baresharding.repository.GitHubReposMapper;
import com.pingcap.vo.PersonalLanguageVO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;
import java.util.stream.Collectors;

/**
 * EventController
 *
 * @author Icemap
 * @date 2022/11/30
 */
@RequestMapping("/personal")
@RestController
public class PersonalController {
    @Autowired
    GitHubReposMapper reposMapper;

    @GetMapping("/language")
    public List<PersonalLanguageVO> getPersonalLanguage(@RequestParam("userID") Long userID) {
        Map<String, Long> languageMap = new HashMap<>();
        AtomicLong totalPRs = new AtomicLong(0L);
        for (int eventsShardID = 0; eventsShardID < GitHubEventsMapper.SHARD_NUMBER; eventsShardID ++) {
            for (int repoShardID = 0; repoShardID < GitHubReposMapper.SHARD_NUMBER; repoShardID ++) {
                reposMapper.getPersonalLanguage(eventsShardID, repoShardID, userID).forEach(personal -> {
                    languageMap.merge(personal.language(), personal.prs(), Long::sum);
                    totalPRs.addAndGet(personal.prs());
                });
            }
        }

        return languageMap.entrySet().stream()
                .map(personal -> new PersonalLanguageVO(
                                personal.getKey(),
                                personal.getValue(),
                                (double) personal.getValue() / (double) totalPRs.get()
                        )
                )
                .collect(Collectors.toList());
    }
}