package top.haijunit.train.service;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.StrUtil;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;
import top.haijunit.common.utils.StreamUtils;
import top.haijunit.train.domain.constant.CacheNames;
import top.haijunit.train.domain.constant.DirectionEnum;
import top.haijunit.train.domain.constant.SectionStatusEnum;
import top.haijunit.train.domain.entity.RouteEntity;
import top.haijunit.train.domain.entity.SelectionEntity;
import top.haijunit.train.domain.entity.SignStopEntity;
import top.haijunit.train.domain.repository.RouteRepository;
import top.haijunit.train.domain.repository.SelectionRepository;
import top.haijunit.train.domain.repository.SignStopRepository;
import top.haijunit.train.simulation.domain.SectionItem;

import java.util.*;
import java.util.function.Function;
import java.util.stream.Collectors;

/**
 * @author zhanghaijun
 * @date 2023/12/9 11:14
 * @description 进路区段计算
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class SectionService {

    private final RouteRepository routeRepository;
    private final SelectionRepository selectionRepository;
    private final SignStopRepository signStopRepository;

    /**
     * 获取所有停车标信息
     * @return 停车标集合
     */
    @Cacheable(cacheNames = CacheNames.SECTION, key = "'StopSignalMap'")
    public HashMap<Long, SignStopEntity> getStopSignalMap() {
        List<SignStopEntity> list = signStopRepository.findAll();
        return list.stream().collect(HashMap::new, (map, entity) -> map.put(entity.getSelectionId(), entity), HashMap::putAll);
    }

    @Cacheable(cacheNames = CacheNames.SECTION, key = "'id-'+#id")
    public SectionItem getSectionItem(String id) {
        return StreamUtils.filter(getAllSection(), item -> {
            return item.getId().equals(id);
        }).stream().findFirst().orElseThrow(() -> new IllegalArgumentException(String.format("不存在该区段,uid: %s", id)));
    }

    @Cacheable(cacheNames = CacheNames.SECTION, key = "'sectionId-'+#sectionId+'-direction-'+#direction.name()")
    public SectionItem getSectionItem(Long sectionId, DirectionEnum direction) {
        List<SectionItem> filter = StreamUtils.filter(getAllSection(), item -> item.getSectionId().equals(sectionId));
        if (filter.size() == 1) {
            return filter.get(0);
        }
        return StreamUtils.filter(getAllSection(), item -> {
            return item.getSectionId().equals(sectionId) && item.getDirection().equals(direction);
        }).stream().findFirst().orElseThrow(() -> new IllegalArgumentException(String.format("不存在该区段,sectionId: %s", sectionId)));
    }

    @Cacheable(cacheNames = CacheNames.SECTION, key = "'routeId-'+#routeId")
    public List<SectionItem> getSectionAll(Long routeId) {
        return StreamUtils.filter(getAllSection(), item -> item.getRouteId().equals(routeId));
    }

    @Cacheable(cacheNames = CacheNames.SECTION, key = "'routeIds-' + T(java.util.Objects).hash(#routeIds)")
    public List<SectionItem> getSectionAll(Collection<Long> routeIds) {
        if (CollUtil.isEmpty(routeIds)) {
            return new ArrayList<>();
        }
        List<SectionItem> allSection = getAllSection();
        Long firstRouteId = CollUtil.getFirst(allSection).getRouteId();
        Long lastRouteId = CollUtil.getLast(allSection).getRouteId();
        if (CollUtil.containsAll(routeIds, CollUtil.newArrayList(firstRouteId, lastRouteId))) {
            // 保证首尾相连的顺序
            ArrayList<SectionItem> result = new ArrayList<>();
            result.addAll(StreamUtils.filter(allSection, item -> item.getRouteId().equals(lastRouteId)));
            result.addAll(StreamUtils.filter(allSection, item -> item.getRouteId().equals(firstRouteId)));
            return result;
        }
        return StreamUtils.filter(getAllSection(), item -> CollUtil.contains(routeIds, item.getRouteId()));
    }

    @Cacheable(cacheNames = CacheNames.SECTION + "-RouteNextId", key = "'sectionId-'+#sectionId+'-direction-'+#direction.name()")
    public Long getRouteNextId(Long sectionId, DirectionEnum direction) {
        SectionItem sectionItem = this.getSectionItem(sectionId, direction);
        RouteEntity route = routeRepository.findById(sectionItem.getRouteId()).orElseThrow(() -> new IllegalArgumentException(String.format("未找到进路数据，routeId: %s", sectionItem.getRouteId())));
        RouteEntity entity = routeRepository.findById(route.getNextId()).orElseThrow(() -> new IllegalArgumentException(String.format("未找到进路数据, routeId: %s", route.getNextId())));
        if (null == entity) {
            throw new IllegalArgumentException(String.format("没有找到下一个进路，区段Id：%s", sectionId));
        }
        return entity.getId();
    }

    /**
     * 获取所有进路的区段
     *
     * @return 全部进路的区段
     */
    @Cacheable(cacheNames = CacheNames.SECTION, key = "'section_all'")
    public List<SectionItem> getAllSection() {
        List<SectionItem> sectionList = new ArrayList<>();
        List<RouteEntity> routeList = routeRepository.findAll();
        Map<Long, SelectionEntity> selectionMap = selectionRepository.findAll().stream().collect(Collectors.toMap(SelectionEntity::getId, Function.identity(), (v1, v2) -> v1));
        for (RouteEntity route : routeList) {
            ArrayList<Long> selectionIds = route.getSelectionList();
            for (int i = 0; i < selectionIds.size(); i++) {
                Long sectionId = selectionIds.get(i);
                SelectionEntity selection = selectionMap.get(sectionId);
                if (null == selection) {
                    throw new IllegalArgumentException(String.format("未找到区段数据，区段Id: %s", sectionId));
                }
                // 区段数据
                SectionItem sectionItem = new SectionItem();
                sectionItem.setSectionId(selection.getId());
                sectionItem.setSectionName(selection.getName());
                sectionItem.setSectionLength(selection.getSelectionLength());
                sectionItem.setStartKilometer(selection.getStartKilometer());
                sectionItem.setSwitch(selection.isSwitch());
                sectionItem.setTurnBack(selection.getZfState());
                sectionItem.setStationId(selection.getStationId());
                // 进路数据
                sectionItem.setId(getSectionUId(route.getId(), selection.getId()));
                sectionItem.setRouteId(route.getId());
                sectionItem.setRouteName(route.getName());
                sectionItem.setDirection(route.getDirection());
                sectionItem.setSectionStatus(SectionStatusEnum.IDLE);
                // 区段连接数据
                if (i == 0) {
                    // 进路的第一个区段
                    sectionItem.setPreId(this.getRouteSectionLast(route.getId()));
                    sectionItem.setNextId(getSectionUId(route.getId(), selectionIds.get(i + 1)));
                } else if (i + 1 >= selectionIds.size()) {
                    // 进路的最后一个区段
                    sectionItem.setPreId(getSectionUId(route.getId(), selectionIds.get(i - 1)));
                    sectionItem.setNextId(this.getRouteSectionFirst(route.getNextId()));
                } else {
                    sectionItem.setPreId(getSectionUId(route.getId(), selectionIds.get(i - 1)));
                    sectionItem.setNextId(getSectionUId(route.getId(), selectionIds.get(i + 1)));
                }
                sectionList.add(sectionItem);
            }
        }
        return sectionList;
    }

    private String getRouteSectionFirst(Long routeId) {
        RouteEntity route = routeRepository.findById(routeId).orElseThrow(() -> new IllegalArgumentException(String.format("未找到进路数据，进路Id: %s", routeId)));
        return getSectionUId(routeId, CollUtil.getFirst(route.getSelectionList()));
    }

    private String getRouteSectionLast(Long routeNextId) {
        RouteEntity entity = routeRepository.findByNextId(routeNextId);
        RouteEntity route = Optional.of(entity).orElseThrow(() -> new IllegalArgumentException(String.format("未找到进路数据，进路Id: %s", routeNextId)));
        return getSectionUId(route.getId(), CollUtil.getLast(route.getSelectionList()));
    }

    /**
     * 进路区段的唯一标识 用于查询唯一的下一个、下一个
     * @param routeI 所在的进路Id
     * @param selectionId 区段Id
     * @return 进路区段Id
     */
    private String getSectionUId(long routeI, long selectionId) {
        return StrUtil.join("-", routeI, selectionId);
    }
}