# All files / src/components/dag DagView.tsx

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     import { useCallback, useMemo, type JSX, type MouseEvent } from "react";
    import {
      ReactFlow,
      Background,
      Controls,
      MiniMap,
      BackgroundVariant,
      type NodeTypes,
      type Node,
    } from "@xyflow/react";
    import "@xyflow/react/dist/style.css";
    import type { TaskData } from "../../hooks/types.js";
    import { useDagLayout, type TaskNodeData } from "./useDagLayout.js";
    import { TaskNode } from "./TaskNode.js";
    import { taskUrl, newTaskUrl, useAppNavigate } from "../../utils/navigation.js";
    import { STATUS_CSS_VAR_MAP } from "../../utils/taskStatus.js";
    import styles from "./DagView.module.scss";

    /** Props for the DagView component. */
    interface Props {
      workspaceId: string;
      environmentId: string;
      /** All tasks — filtered internally by workspaceId. */
      tasks: TaskData[];
      /** Resolved theme ID, used to recompute CSS variable colors for the MiniMap. */
      resolvedThemeId: string;
    }

    /** CSS variable mapping for MiniMap node coloring by task status. */
    const STATUS_VAR_MAP: Record<string, string> = STATUS_CSS_VAR_MAP;

    /** Custom node type registry for React Flow. */
    const nodeTypes: NodeTypes = {
      task: TaskNode,
    };

    /** Interactive DAG visualization of task hierarchy and dependency relationships. */
    export function DagView({
      workspaceId,
      environmentId,
      tasks,
      resolvedThemeId,
    }: Props): JSX.Element {
      const navigate = useAppNavigate();

      const workspaceTasks = useMemo(
        () => tasks.filter((t) => t.workspaceId === workspaceId),
        [tasks, workspaceId],
      );

      const { nodes, edges } = useDagLayout(workspaceTasks);

      /** Cached color map — recomputed only when the theme changes. */
      const statusColors = useMemo(() => {
        const style = getComputedStyle(document.documentElement);
        const colors: Record<string, string> = {};
        for (const [status, varName] of Object.entries(STATUS_VAR_MAP)) {
          colors[status] = style.getPropertyValue(varName).trim() || "#6b7a8d";
        }
        return colors;
      }, [resolvedThemeId]);

      const onNodeClick = useCallback(
        (_event: MouseEvent, node: Node) => {
          navigate(taskUrl(node.id, undefined, workspaceId, environmentId));
        },
        [navigate, workspaceId, environmentId],
      );

      /** Returns a hex color for the MiniMap based on task status. */
      const minimapNodeColor = useCallback(
        (node: Node): string => {
          const data = node.data as TaskNodeData;
          return statusColors[data.task.status] || statusColors.pending;
        },
        [statusColors],
      );

      if (workspaceTasks.length === 0) {
        return (
          <div className={styles.emptyCta}>
            <button
              className={styles.ctaButton}
              onClick={() => navigate(newTaskUrl(workspaceId, undefined, environmentId))}
            >
              Create Task
            </button>
            <div className={styles.ctaDescription}>Create tasks to see the dependency graph</div>
          </div>
        );
      }

      return (
        <div className={styles.dagContainer}>
          <ReactFlow
            nodes={nodes}
            edges={edges}
            nodeTypes={nodeTypes}
            onNodeClick={onNodeClick}
            // Read-only DAG: dependencies aren't created by dragging (no onConnect),
            // so disable the drag-to-connect affordance on node handles (#1303).
            nodesConnectable={false}
            fitView
            fitViewOptions={{ padding: 0.2 }}
            minZoom={0.3}
            maxZoom={2}
          >
            <Background
              variant={BackgroundVariant.Dots}
              gap={24}
              size={1}
              color="var(--text-disabled)"
            />
            <Controls showInteractive={false} />
            <MiniMap
              nodeColor={minimapNodeColor}
              maskColor="var(--bg-overlay)"
              style={{ background: "var(--bg-inset)" }}
            />
          </ReactFlow>
        </div>
      );
    }