package top.haijunit.train.service;

import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import top.haijunit.common.utils.StreamUtils;
import top.haijunit.train.domain.constant.DirectionEnum;
import top.haijunit.train.domain.entity.RouteEntity;
import top.haijunit.train.domain.entity.SelectionEntity;
import top.haijunit.train.domain.repository.RouteRepository;
import top.haijunit.train.domain.repository.SelectionRepository;
import top.haijunit.train.simulation.TrainItem;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.function.Function;

/**
 * @author zhanghaijun
 * @date 2023/11/29 06:54
 * @description [一句话描述该类的功能]
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class RouteService {

    private final RouteRepository routeRepository;
    private final SelectionRepository selectionRepository;

    public RouteEntity getNextRoute(RouteEntity route) {
        return routeRepository.findById(route.getNextId()).orElse(null);
    }

    public RouteEntity getNextRoute(Long id) {
        List<RouteEntity> routeList = routeRepository.findAll();
        for (int i = 0; i < routeList.size(); i++) {
            if (routeList.get(i).getId().equals(id)) {
                if (i == routeList.size() - 1) {
                    return routeList.get(0);
                } else {
                    return routeList.get(i + 1);
                }
            }
        }
        return null;
    }

    public RouteEntity getCurrentRoute(TrainItem train) {
        Map<Long, SelectionEntity> selectionMap = StreamUtils.toMap(selectionRepository.findAll(), SelectionEntity::getId, Function.identity());
        for (RouteEntity route : routeRepository.findAll()) {
            ArrayList<Long> list = route.getSelectionList();
            SelectionEntity start = selectionMap.get(list.get(0));
            SelectionEntity end = selectionMap.get(list.get(list.size() - 1));
            if (null == start || null == end) {
                continue;
            }
            if (train.getDirection() == DirectionEnum.UP && start.getStartKilometer().compareTo(train.getKilometer()) <= 0 && end.getStartKilometer().add(end.getSelectionLength()).compareTo(train.getKilometer()) > 0) {
                return route;
            }
            if (train.getDirection() == DirectionEnum.DOWN && start.getStartKilometer().compareTo(train.getKilometer()) >= 0 && end.getStartKilometer().add(end.getSelectionLength()).compareTo(train.getKilometer()) < 0) {
                return route;
            }
        }
        return null;
    }
}