import { store } from '#store/stores.svelte';
import type { Edge, Node } from '@xyflow/svelte';

export const useGetNodesFromSource = () => {
  const getEdgesBySource = (target: string, edges: Edge[]) => {
    return edges.filter(
      // 排除循环节点的子节点，否则在多层循环嵌套时不正确
      (edge) => edge.source === target && edge.sourceHandle !== 'loop_handle',
    );
  };

  const getNodesFromSource = (sourceNodeId: string) => {
    const edges = store.getEdges();
    const result: Node[] = [];

    let edgesFromSource = getEdgesBySource(sourceNodeId, edges);
    while (edgesFromSource.length > 0) {
      const newEdgesFromSource: Edge[] = [];
      edgesFromSource.forEach((edge) => {
        result.push(store.getNode(edge.target)!);
        newEdgesFromSource.push(...getEdgesBySource(edge.target, edges));
      });
      edgesFromSource = newEdgesFromSource;
    }

    return result;
  };
  return {
    getNodesFromSource,
  };
};