package com.lingyue.graph.service;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.lingyue.graph.entity.Edge;
import com.lingyue.graph.mapper.EdgeMapper;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@RequiredArgsConstructor
public class EdgeService extends ServiceImpl<EdgeMapper, Edge> {

    public Long createEdge(String edgeType, Long fromNodeId, Long toNodeId) {
        return createEdge(edgeType, fromNodeId, toNodeId, 0);
    }

    public Long createEdge(String edgeType, Long fromNodeId, Long toNodeId, int sortOrder) {
        Edge existing = baseMapper.selectByTypeAndNodes(edgeType, fromNodeId, toNodeId);
        if (existing != null) {
            return existing.getId();
        }

        Edge edge = new Edge();
        edge.setEdgeType(edgeType);
        edge.setFromNodeId(fromNodeId);
        edge.setToNodeId(toNodeId);
        edge.setSortOrder(sortOrder);
        edge.setCreatedAt(LocalDateTime.now());
        baseMapper.insert(edge);
        return edge.getId();
    }

    public List<Edge> listByTypeAndFrom(String edgeType, Long fromNodeId) {
        return baseMapper.selectByTypeAndFrom(edgeType, fromNodeId);
    }

    public List<Edge> listByTypeAndTo(String edgeType, Long toNodeId) {
        return baseMapper.selectByTypeAndTo(edgeType, toNodeId);
    }

    public Edge getByTypeAndNodes(String edgeType, Long fromNodeId, Long toNodeId) {
        return baseMapper.selectByTypeAndNodes(edgeType, fromNodeId, toNodeId);
    }

    public void deleteByTypeAndNodes(String edgeType, Long fromNodeId, Long toNodeId) {
        baseMapper.deleteByTypeAndNodes(edgeType, fromNodeId, toNodeId);
    }

    public int countByTypeAndFrom(String edgeType, Long fromNodeId) {
        return baseMapper.countByTypeAndFrom(edgeType, fromNodeId);
    }

    public void deleteByTypeAndFrom(String edgeType, Long fromNodeId) {
        baseMapper.deleteByTypeAndFrom(edgeType, fromNodeId);
    }
}