# All files / src/components/tools KnowledgeCard.tsx

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     import { useState, type JSX } from "react";
    import type { ToolCardProps } from "./ToolCardProps.js";
    import { extractBareName } from "./classifyTool.js";
    import styles from "./toolCards.module.scss";

    /** Shape of a knowledge search result node. */
    interface KnowledgeResult {
      score?: number;
      node?: KnowledgeNode;
    }

    /** Shape of a knowledge graph node. */
    interface KnowledgeNode {
      id?: string;
      kind?: string;
      label?: string;
      title?: string;
      category?: string;
      content?: string;
      tags?: string[];
    }

    /** Extracts knowledge-relevant fields from tool args. */
    function getArgs(args: unknown): { query?: string; id?: string } {
      if (args === null || args === undefined || typeof args !== "object") {
        return {};
      }
      const a = args as Record<string, unknown>;
      return {
        query: typeof a.query === "string" ? a.query : undefined,
        id: typeof a.id === "string" ? a.id : undefined,
      };
    }

    /** Parses knowledge result. Could be search results or a single node. */
    function parseResult(result: string | undefined): {
      results?: KnowledgeResult[];
      node?: KnowledgeNode;
      edgeCount?: number;
    } {
      if (!result) {
        return {};
      }
      try {
        const parsed: unknown = JSON.parse(result);
        if (typeof parsed !== "object" || parsed === null) {
          return {};
        }
        const obj = parsed as Record<string, unknown>;
        // knowledge_search returns { results: [...], neighbors, neighborEdges }
        if (Array.isArray(obj.results)) {
          return {
            results: (obj.results as unknown[]).filter(
              (v): v is KnowledgeResult => v !== null && typeof v === "object",
            ),
          };
        }
        // knowledge_get_node returns { node, edges, neighbors }
        if (typeof obj.node === "object" && obj.node !== null) {
          const edges = Array.isArray(obj.edges) ? obj.edges.length : 0;
          return { node: obj.node as KnowledgeNode, edgeCount: edges };
        }
        // knowledge_create_node returns { id, title, category }
        if (typeof obj.id === "string") {
          return { node: obj as KnowledgeNode };
        }
      } catch {
        /* fall through */
      }
      return {};
    }

    /** Number of results shown when collapsed. */
    const PREVIEW_COUNT: number = 5;

    /** Renders a knowledge tool call (knowledge_search, knowledge_get_node) with structured display. */
    export function KnowledgeCard({ tool, args, result, isError }: ToolCardProps): JSX.Element {
      const [expanded, setExpanded] = useState(false);
      const bareName = extractBareName(tool);
      const argData = getArgs(args);
      const inProgress = result === undefined;
      const resultData = parseResult(result);

      return (
        <div
          className={`${styles.card} ${isError ? styles.cardRed : styles.cardPurple} ${inProgress ? styles.inProgress : ""}`}
          data-testid="tool-card-knowledge"
        >
          <div className={styles.header}>
            <span className={styles.icon} aria-hidden="true">
              &#x1F9E0;
            </span>
            <span className={styles.toolName} style={{ color: "var(--accent-purple, #a78bfa)" }}>
              {bareName}
            </span>
            {argData.query && (
              <span className={styles.fileName} data-testid="tool-card-knowledge-query">
                &quot;{argData.query}&quot;
              </span>
            )}
            {argData.id && !argData.query && (
              <span className={styles.fileName} data-testid="tool-card-knowledge-id">
                {argData.id}
              </span>
            )}
            {resultData.results && (
              <>
                <span className={styles.spacer} />
                <span className={styles.badge} data-testid="tool-card-knowledge-count">
                  {resultData.results.length} {resultData.results.length === 1 ? "result" : "results"}
                </span>
              </>
            )}
            {resultData.node && resultData.edgeCount !== undefined && (
              <>
                <span className={styles.spacer} />
                <span className={styles.badge} data-testid="tool-card-knowledge-edges">
                  {resultData.edgeCount} {resultData.edgeCount === 1 ? "edge" : "edges"}
                </span>
              </>
            )}
          </div>

          {/* In-progress: show args */}
          {inProgress && args !== null && args !== undefined && !argData.query && !argData.id && (
            <pre className={styles.pre} data-testid="tool-card-args">
              {JSON.stringify(args, null, 2)}
            </pre>
          )}

          {/* Error */}
          {isError && result && (
            <pre className={styles.pre} data-testid="tool-card-error">
              {result}
            </pre>
          )}

          {/* Search results */}
          {!isError && resultData.results && resultData.results.length > 0 && (
            <>
              <pre className={styles.pre} data-testid="tool-card-knowledge-results">
                {(expanded ? resultData.results : resultData.results.slice(0, PREVIEW_COUNT))
                  .map((r) => {
                    const label = r.node?.title ?? r.node?.label ?? r.node?.id ?? "node";
                    const score = r.score !== undefined ? ` (${(r.score * 100).toFixed(0)}%)` : "";
                    return `${label}${score}`;
                  })
                  .join("\n")}
              </pre>
              {resultData.results.length > PREVIEW_COUNT && (
                <button
                  type="button"
                  className={styles.bodyToggle}
                  onClick={() => {
                    setExpanded((v) => !v);
                  }}
                  aria-expanded={expanded}
                  data-testid="tool-card-toggle"
                >
                  <span className={`${styles.chevron} ${expanded ? styles.chevronExpanded : ""}`}>
                    &#x25B8;
                  </span>
                  {expanded ? "collapse" : `${resultData.results.length - PREVIEW_COUNT} more results`}
                </button>
              )}
            </>
          )}

          {/* Single node */}
          {!isError && resultData.node && !resultData.results && (
            <pre className={styles.pre} data-testid="tool-card-knowledge-node">
              {[
                resultData.node.id ? `id: ${resultData.node.id}` : null,
                resultData.node.title ? `title: ${resultData.node.title}` : null,
                resultData.node.category ? `category: ${resultData.node.category}` : null,
                resultData.node.kind ? `kind: ${resultData.node.kind}` : null,
                resultData.node.content
                  ? `content: ${resultData.node.content.length > 100 ? resultData.node.content.slice(0, 100) + "..." : resultData.node.content}`
                  : null,
              ]
                .filter(Boolean)
                .join("\n")}
            </pre>
          )}
        </div>
      );
    }