approveflow/app/provider/abstract/connect/node.go

package connect

import (
	"approveflow/app/base"
	"encoding/json"
	"fmt"
)

type NodeConnectTest struct {
	Nodes   []*Node
	NodeMap map[string]*Node // 用于快速查找节点
}

type NodeManager interface {
	GetNodes() []AbstractNode
	SetNodes([]AbstractNode)
	GetNodeMap() map[string]AbstractNode
	NewNodePathConfig(fromNodeKey, toNodeKey string) AbstractNodePathConfig
	Delete()
}

type NodeManagerS struct {
	NodeManager
}

type AbstractNode interface {
	GetPathConfigs() []AbstractNodePathConfig
	SetPathConfigs([]AbstractNodePathConfig)
	GetKey() string
	Delete()
}

type AbstractNodePathConfig interface {
	GetKey() string
	GetNodeID() int64
	GetFromNodeKey() string
	GetToNodeKey() string
	Delete()
}

type Node struct {
	PathConfigs []AbstractNodePathConfig `gorm:"-" json:"path_configs"`
	base.Model
}

func (n *Node) MarshalBinary() ([]byte, error) {
	return json.Marshal(n)
}

func (n *Node) UnmarshalBinary(data []byte) error {
	return json.Unmarshal(data, n)
}

func (n *Node) GetPathConfigs() []AbstractNodePathConfig {
	return n.PathConfigs
}

func (n *Node) SetPathConfigs(configs []AbstractNodePathConfig) {
	n.PathConfigs = configs
}

func (n *Node) GetKey() string {
	return n.Key
}

type NodePathConfig struct {
	NodeID      int64  `gorm:"type:bigint;index;not null" json:"node_id"`
	FromNodeKey string `gorm:"type:varchar(50);index;not null" json:"from_node_key"`
	ToNodeKey   string ` gorm:"type:varchar(50);index;not null" json:"to_node_key"`
	base.Model
}

func (n *NodePathConfig) MarshalBinary() ([]byte, error) {
	return json.Marshal(n)
}

func (n *NodePathConfig) UnmarshalBinary(data []byte) error {
	return json.Unmarshal(data, n)
}

func (n NodePathConfig) GetKey() string {
	return n.Key
}

func (n NodePathConfig) GetNodeID() int64 {
	return n.NodeID
}

func (n NodePathConfig) GetFromNodeKey() string {
	return n.FromNodeKey
}

func (n NodePathConfig) GetToNodeKey() string {
	return n.ToNodeKey
}

func (s *NodeManagerS) InitializeNodeMap() {
	InitializeNodeMap(s)
}

func InitializeNodeMap(nct NodeManager) {
	for _, node := range nct.GetNodes() {
		nct.GetNodeMap()[node.GetKey()] = node
	}
}

func GetNextNodes(nct NodeManager, node AbstractNode) ([]AbstractNode, error) {
	// 获取所有节点和路径配置
	nodeMap := nct.GetNodeMap()
	pathConfigs := node.GetPathConfigs()
	// 存储下一个节点
	var nextNodes []AbstractNode
	// 遍历当前节点的路径配置
	for _, pathConfig := range pathConfigs {
		if pathConfig.GetFromNodeKey() == node.GetKey() {
			// 根据路径配置的 ToNodeKey 找到目标节点
			nextNodeKey := pathConfig.GetToNodeKey()
			if nextNode, exists := nodeMap[nextNodeKey]; exists {
				nextNodes = append(nextNodes, nextNode)
			} else {
				return nil, fmt.Errorf("next node with key %s not found", nextNodeKey)
			}
		}
	}
	return nextNodes, nil
}

func (s *NodeManagerS) InsertNodeFirst(newNode AbstractNode) *NodeManagerS {
	if s.GetNodes() == nil {
		s.SetNodes([]AbstractNode{newNode})
	}
	s.SetNodes(append(s.GetNodes(), newNode))
	return s
}

func InsertNodeFirst(nct NodeManager, newNode AbstractNode) {
	if nct.GetNodes() == nil {
		nct.SetNodes([]AbstractNode{newNode})
	}
	nct.SetNodes(append(nct.GetNodes(), newNode))
}

func (s *NodeManagerS) InsertNodeBetween(fromNode, toNode, newNode AbstractNode) error {
	return InsertNodeBetween(s, fromNode, toNode, newNode)
}

// InsertNodeBetween 在两个节点之间插入新节点
func InsertNodeBetween(nct NodeManager, fromNode, toNode, newNode AbstractNode) error {
	if fromNode == nil || toNode == nil || newNode == nil {
		return fmt.Errorf("节点不能为空")
	}

	// 移除从 fromNode 到 toNode 的路径
	removePath(nct, fromNode, toNode)

	// 添加从 fromNode 到 newNode 的路径
	addPath(nct, fromNode, newNode)

	// 添加从 newNode 到 toNode 的路径
	addPath(nct, newNode, toNode)

	// 如果新节点不在节点列表中，添加进去
	if _, exists := nct.GetNodeMap()[newNode.GetKey()]; !exists {
		nct.SetNodes(append(nct.GetNodes(), newNode))
		nct.GetNodeMap()[newNode.GetKey()] = newNode
	}

	return nil
}

func (s *NodeManagerS) InsertNodeAfter(node, newNode AbstractNode) error {
	return InsertNodeAfter(s, node, newNode)
}

// InsertNodeAfter 在指定节点之后插入节点
func InsertNodeAfter(nct NodeManager, node, newNode AbstractNode) error {
	if node == nil || newNode == nil {
		return fmt.Errorf("节点不能为空")
	}

	// 获取从当前节点出去的所有节点
	outgoingNodes := getOutgoingNodes(nct, node)

	// 移除这些路径并重新连接
	for _, toNode := range outgoingNodes {
		removePath(nct, node, toNode)
		addPath(nct, newNode, toNode)
	}

	// 添加从当前节点到新节点的路径
	addPath(nct, node, newNode)

	// 如果新节点不在节点列表中，添加进去
	if _, exists := nct.GetNodeMap()[newNode.GetKey()]; !exists {
		nct.SetNodes(append(nct.GetNodes(), newNode))
		nct.GetNodeMap()[newNode.GetKey()] = newNode
	}

	return nil
}

func (s *NodeManagerS) InsertNodeBefore(node, newNode AbstractNode) error {
	return InsertNodeBefore(s, node, newNode)
}

// InsertNodeBefore 在指定节点之前插入节点
func InsertNodeBefore(nct NodeManager, node, newNode AbstractNode) error {
	if node == nil || newNode == nil {
		return fmt.Errorf("节点不能为空")
	}

	// 获取指向当前节点的所有节点
	incomingNodes := getIncomingNodes(nct, node)

	// 移除这些路径并重新连接
	for _, fromNode := range incomingNodes {
		removePath(nct, fromNode, node)
		addPath(nct, fromNode, newNode)
	}

	// 添加从新节点到当前节点的路径
	addPath(nct, newNode, node)

	// 如果新节点不在节点列表中，添加进去
	if _, exists := nct.GetNodeMap()[newNode.GetKey()]; !exists {
		nct.SetNodes(append(nct.GetNodes(), newNode))
		nct.GetNodeMap()[newNode.GetKey()] = newNode
	}

	return nil
}

func (s *NodeManagerS) VerifyConnections() error {
	return VerifyConnections(s)
}

// VerifyConnections 验证节点连接
func VerifyConnections(nct NodeManager) error {
	for _, node := range nct.GetNodes() {
		for _, pc := range node.GetPathConfigs() {
			if _, exists := nct.GetNodeMap()[pc.GetFromNodeKey()]; !exists {
				return fmt.Errorf("FromNodeKey %s 不存在", pc.GetFromNodeKey())
			}
			if _, exists := nct.GetNodeMap()[pc.GetToNodeKey()]; !exists {
				return fmt.Errorf("ToNodeKey %s 不存在", pc.GetToNodeKey())
			}
		}
	}
	return nil
}

func (s *NodeManagerS) PrintConnections() {
	PrintConnections(s)
}

// PrintConnections 打印连接情况
func PrintConnections(nct NodeManager) {
	fmt.Println("节点连接情况：")
	for _, node := range nct.GetNodes() {
		for _, pc := range node.GetPathConfigs() {
			fmt.Printf("节点 %s -> 节点 %s\n", pc.GetFromNodeKey(), pc.GetToNodeKey())
		}
	}
}

// addPath 添加路径
func addPath(nct NodeManager, fromNode, toNode AbstractNode) {
	pathConfig := nct.NewNodePathConfig(fromNode.GetKey(), toNode.GetKey())
	fromNode.SetPathConfigs(append(fromNode.GetPathConfigs(), pathConfig))
}

// removePath 移除路径
func removePath(nct NodeManager, fromNode, toNode AbstractNode) {
	var newPathConfigs []AbstractNodePathConfig
	for _, pc := range fromNode.GetPathConfigs() {
		if pc.GetFromNodeKey() == fromNode.GetKey() && pc.GetToNodeKey() == toNode.GetKey() {
			// 使用软删除的方式
			pc.Delete()
		}
		newPathConfigs = append(newPathConfigs, pc)
	}
	fromNode.SetPathConfigs(newPathConfigs)
}

// getOutgoingNodes 获取后继节点
func getOutgoingNodes(nct NodeManager, node AbstractNode) []AbstractNode {
	var result []AbstractNode
	for _, pc := range node.GetPathConfigs() {
		if toNode, exists := nct.GetNodeMap()[pc.GetToNodeKey()]; exists {
			result = append(result, toNode)
		}
	}
	return result
}

// getIncomingNodes 获取前驱节点
func getIncomingNodes(nct NodeManager, node AbstractNode) []AbstractNode {
	var result []AbstractNode
	for _, n := range nct.GetNodes() {
		for _, pc := range n.GetPathConfigs() {
			if pc.GetToNodeKey() == node.GetKey() {
				result = append(result, n)
			}
		}
	}
	return result
}