/** @jsxRuntime classic */
/** @jsx React.createElement */
// @deno-types="npm:@types/react@19.2.18"
// deno-lint-ignore no-external-import
import React from "npm:react@19.2.8";
// @deno-types="npm:@types/react-dom@19.2.5/client.d.ts"
// deno-lint-ignore no-external-import
import { createRoot } from "npm:react-dom@19.2.8/client";
import {
  applyNodeChanges,
  Background,
  Controls,
  type Edge,
  Handle,
  MarkerType,
  MiniMap,
  type Node,
  type NodeChange,
  type NodeProps,
  Position,
  ReactFlow,
} from "@xyflow/react";
import { connectFabric } from "@commonfabric/iframe-sandbox/guest";
import { createFabricReact } from "@commonfabric/iframe-sandbox/react";
import {
  DEFAULT_INPUT,
  DEFAULT_OUTPUT,
  DEFAULT_STATE,
  type GateOperator,
  type IframeInputData,
  type IframeOutputData,
  type IframeStateData,
  machineEdgeId,
  type MachineNode,
  type MachineNodeKind,
  type MachineParameters,
  type MachinePosition,
} from "./contract.ts";
import {
  type CanvasReactRuntime,
  createMachineCanvas,
  type MachineCanvasProps,
} from "./machine-canvas/guest.ts";
import * as model from "./model.ts";

const fabric = connectFabric();
const { useCell } = createFabricReact(React, fabric);
const inputCell = fabric.cell<IframeInputData>("input");
const stateCell = fabric.cell<IframeStateData>("state");
const outputCell = fabric.cell<IframeOutputData>("output");

const KIND_LABELS: Record<MachineNodeKind, string> = {
  sensor: "Sensor",
  gate: "Gate",
  delay: "Delay",
  transformer: "Transformer",
  actuator: "Actuator",
};

const KIND_ICONS: Record<MachineNodeKind, string> = {
  sensor: "◉",
  gate: "◇",
  delay: "◷",
  transformer: "⌁",
  actuator: "✦",
};

const KIND_COLORS: Record<MachineNodeKind, string> = {
  sensor: "#55d6be",
  gate: "#a78bfa",
  delay: "#f4bf63",
  transformer: "#5ea8ff",
  actuator: "#ff6b8a",
};

type NodeViewData = {
  node: MachineNode;
  signal: model.SignalPresentation;
  disabled: boolean;
};

type MachineFlowNode = Node<NodeViewData, MachineNodeKind>;

type NodeActions = {
  updateParameter<K extends keyof MachineParameters>(
    nodeId: string,
    key: K,
    value: MachineParameters[K],
  ): Promise<boolean>;
};

const NodeActionContext = React.createContext<NodeActions | undefined>(
  undefined,
);

function useNodeActions(): NodeActions {
  const actions = React.useContext(NodeActionContext);
  if (!actions) throw new Error("Machine node rendered without its actions.");
  return actions;
}

function defaultParameters(kind: MachineNodeKind): MachineParameters {
  return {
    active: kind === "sensor",
    strength: 1,
    operator: "and",
    delaySteps: 1,
    gain: 1,
    offset: 0,
    threshold: 0.6,
  };
}

function NumberParameter({
  nodeId,
  name,
  label,
  value,
  min,
  max,
  step,
  disabled,
}: {
  nodeId: string;
  name: "strength" | "delaySteps" | "gain" | "offset" | "threshold";
  label: string;
  value: number;
  min: number;
  max: number;
  step: number;
  disabled: boolean;
}) {
  const { updateParameter } = useNodeActions();
  const [draft, setDraft] = React.useState(String(value));
  const editing = React.useRef(false);

  React.useEffect(() => {
    if (!editing.current) setDraft(String(value));
  }, [value]);

  const commit = () => {
    editing.current = false;
    const parsed = Number(draft);
    const next = Number.isFinite(parsed)
      ? Math.min(max, Math.max(min, parsed))
      : value;
    setDraft(String(next));
    if (next !== value) void updateParameter(nodeId, name, next);
  };

  return (
    <label className="parameter-row">
      <span>{label}</span>
      <input
        className="nodrag nopan"
        data-param={name}
        type="number"
        value={draft}
        min={min}
        max={max}
        step={step}
        disabled={disabled}
        onFocus={() => editing.current = true}
        onChange={(event) => setDraft(event.currentTarget.value)}
        onBlur={commit}
        onKeyDown={(event) => {
          if (event.key === "Enter") event.currentTarget.blur();
        }}
      />
    </label>
  );
}

function NodeFrame({
  id,
  data,
  children,
  hasInput = true,
  hasOutput = true,
}: NodeProps<MachineFlowNode> & {
  children: React.ReactNode;
  hasInput?: boolean;
  hasOutput?: boolean;
}) {
  const active = data.signal.highlighted;
  return (
    <article
      className={`machine-node machine-node--${data.node.kind} ${
        active ? "is-active" : ""
      }`}
      data-node-id={id}
      data-node-kind={data.node.kind}
      data-signal={data.signal.semantic.toFixed(2)}
    >
      {hasInput && (
        <Handle
          id="input"
          type="target"
          position={Position.Left}
          isConnectable={!data.disabled}
        />
      )}
      <header>
        <span className="node-icon" aria-hidden="true">
          {KIND_ICONS[data.node.kind]}
        </span>
        <span>
          <small>{KIND_LABELS[data.node.kind]}</small>
          <strong>{data.node.label}</strong>
        </span>
        <output aria-label={`${data.node.label} signal`}>
          {data.signal.label}
        </output>
      </header>
      <div {...model.nodeControlBoundaryProps()}>{children}</div>
      {hasOutput && (
        <Handle
          id="output"
          type="source"
          position={Position.Right}
          isConnectable={!data.disabled}
        />
      )}
    </article>
  );
}

function SensorNode(props: NodeProps<MachineFlowNode>) {
  const { updateParameter } = useNodeActions();
  const { node, disabled } = props.data;
  return (
    <NodeFrame {...props} hasInput={false}>
      <button
        className="sensor-toggle nodrag nopan"
        type="button"
        data-param="active"
        aria-pressed={node.parameters.active}
        disabled={disabled}
        onClick={() =>
          void updateParameter(
            node.id,
            "active",
            !node.parameters.active,
          )}
      >
        {node.parameters.active ? "Emitting" : "Dormant"}
      </button>
      <NumberParameter
        nodeId={node.id}
        name="strength"
        label="Strength"
        value={node.parameters.strength}
        min={0}
        max={1}
        step={0.05}
        disabled={disabled}
      />
    </NodeFrame>
  );
}

function GateNode(props: NodeProps<MachineFlowNode>) {
  const { updateParameter } = useNodeActions();
  const { node, disabled } = props.data;
  return (
    <NodeFrame {...props}>
      <label className="parameter-row">
        <span>Logic</span>
        <select
          className="nodrag nopan"
          data-param="operator"
          value={node.parameters.operator}
          disabled={disabled}
          onChange={(event) =>
            void updateParameter(
              node.id,
              "operator",
              event.currentTarget.value as GateOperator,
            )}
        >
          <option value="and">AND</option>
          <option value="or">OR</option>
          <option value="xor">XOR</option>
        </select>
      </label>
    </NodeFrame>
  );
}

function DelayNode(props: NodeProps<MachineFlowNode>) {
  const { node, disabled } = props.data;
  return (
    <NodeFrame {...props}>
      <NumberParameter
        nodeId={node.id}
        name="delaySteps"
        label="Ticks"
        value={node.parameters.delaySteps}
        min={1}
        max={8}
        step={1}
        disabled={disabled}
      />
    </NodeFrame>
  );
}

function TransformerNode(props: NodeProps<MachineFlowNode>) {
  const { node, disabled } = props.data;
  return (
    <NodeFrame {...props}>
      <NumberParameter
        nodeId={node.id}
        name="gain"
        label="Gain"
        value={node.parameters.gain}
        min={-2}
        max={3}
        step={0.1}
        disabled={disabled}
      />
      <NumberParameter
        nodeId={node.id}
        name="offset"
        label="Offset"
        value={node.parameters.offset}
        min={-1}
        max={1}
        step={0.05}
        disabled={disabled}
      />
    </NodeFrame>
  );
}

function ActuatorNode(props: NodeProps<MachineFlowNode>) {
  const { node, disabled } = props.data;
  return (
    <NodeFrame {...props} hasOutput={false}>
      <NumberParameter
        nodeId={node.id}
        name="threshold"
        label="Trigger"
        value={node.parameters.threshold}
        min={0}
        max={1}
        step={0.05}
        disabled={disabled}
      />
      <p className="actuator-state">
        {model.isActuatorFiring(node, props.data.signal.semantic)
          ? "Launched!"
          : "Standing by"}
      </p>
    </NodeFrame>
  );
}

const NODE_TYPES = {
  sensor: SensorNode,
  gate: GateNode,
  delay: DelayNode,
  transformer: TransformerNode,
  actuator: ActuatorNode,
};

const MachineCanvas = createMachineCanvas<MachineFlowNode>(
  React as unknown as CanvasReactRuntime,
  {
    ReactFlow,
    Background,
    Controls,
    MiniMap,
    applyNodeChanges: (changes, nodes) =>
      applyNodeChanges(
        changes as NodeChange<MachineFlowNode>[],
        nodes,
      ),
  },
  NODE_TYPES,
  KIND_COLORS,
) as React.ComponentType<
  MachineCanvasProps<MachineFlowNode>
>;

function App() {
  const input = useCell<IframeInputData | undefined>("input");
  const state = useCell<IframeStateData | undefined>("state");
  const output = useCell<IframeOutputData | undefined>("output");
  const [materialized, setMaterialized] = React.useState(false);
  const [initializationError, setInitializationError] = React.useState<Error>();
  const [actionError, setActionError] = React.useState<Error>();
  const [pending, setPending] = React.useState(false);
  const [busyNodeCounts, setBusyNodeCounts] = React.useState<
    Readonly<Record<string, number>>
  >({});
  const [connectSource, setConnectSource] = React.useState("");
  const [connectTarget, setConnectTarget] = React.useState("");
  const bootstrapStarted = React.useRef(false);
  const actionRunner = React.useRef(model.createActionRunner({
    setGlobalPending: setPending,
    setActionError,
    setBusyNodeCounts,
  })).current;
  const selectionRequestTracker = React.useRef(
    model.createSelectionRequestTracker(null),
  );

  React.useEffect(() => {
    if (bootstrapStarted.current) return;
    bootstrapStarted.current = true;
    let active = true;
    void (async () => {
      try {
        await Promise.all([
          inputCell.pull(),
          stateCell.pull(),
          outputCell.pull(),
        ]);
        await Promise.all([
          stateCell.initialize(DEFAULT_STATE),
          outputCell.initialize(DEFAULT_OUTPUT),
        ]);
        const samples = [inputCell.get(), stateCell.get(), outputCell.get()];
        if (samples.some((sample) => sample === undefined)) {
          throw new Error(
            "Fabric resources were not readable after hydration.",
          );
        }
        await Promise.all([
          input.refresh(),
          state.refresh(),
          output.refresh(),
        ]);
        if (active) setMaterialized(true);
      } catch (cause) {
        if (active) setInitializationError(model.errorFrom(cause));
      }
    })();
    return () => {
      active = false;
    };
  }, [input.refresh, output.refresh, state.refresh]);

  const runAction = actionRunner.run;
  const runNodeAction = actionRunner.runNode;
  const runQuietAction = actionRunner.runQuiet;

  const locateNodeCell = React.useCallback(async (nodeId: string) => {
    const nodesCell = stateCell.key("nodes");
    const nodes = await nodesCell.pull();
    const located = model.findAppendOnlyItem(nodes, nodeId);
    if (!located) throw new Error(`Module ${nodeId} no longer exists.`);
    const nodeCell = nodesCell.key(located.index);
    const node = await nodeCell.pull();
    if (node.id !== nodeId) {
      throw new Error(`Module ${nodeId} moved while it was being edited.`);
    }
    return nodeCell;
  }, []);

  const updateParameter = React.useCallback(
    <K extends keyof MachineParameters>(
      nodeId: string,
      key: K,
      value: MachineParameters[K],
    ) =>
      runNodeAction(nodeId, async () => {
        const node = await locateNodeCell(nodeId);
        await node.key("parameters").key(key).set(value);
        await state.refresh();
      }),
    [locateNodeCell, runNodeAction, state.refresh],
  );

  const persistPosition = React.useCallback(
    async (nodeId: string, position: MachinePosition) => {
      const succeeded = await runQuietAction(async () => {
        const node = await locateNodeCell(nodeId);
        await node.key("position").set(position);
        await state.refresh();
      });
      if (!succeeded) return undefined;
      return stateCell.get()?.nodes.find((node) => node.id === nodeId)
        ?.position ?? position;
    },
    [locateNodeCell, runQuietAction, state.refresh],
  );

  const appendNode = React.useCallback(
    (kind: MachineNodeKind) =>
      runAction(async () => {
        const id = crypto.randomUUID();
        const presentation = model.machineNodePresentation(id);
        const node: MachineNode = {
          id,
          kind,
          label: `${KIND_LABELS[kind]} · ${presentation.code}`,
          position: presentation.position,
          parameters: defaultParameters(kind),
        };
        await stateCell.key("nodes").push(node);
        await state.refresh();
      }),
    [runAction, state.refresh],
  );

  const appendEdge = React.useCallback(
    (connection: { source: string | null; target: string | null }) =>
      runAction(async () => {
        const source = connection.source;
        const target = connection.target;
        if (!source || !target || source === target) {
          throw new Error("Choose two different modules to connect.");
        }
        const latest = await stateCell.pull();
        const edges = latest.edges;
        const edgeId = machineEdgeId(source, target);
        if (
          edges.some((edge) => edge.source === source && edge.target === target)
        ) {
          if (latest.disabledEdges?.[edgeId] === true) {
            await stateCell.key("disabledEdges").key(edgeId).set(false);
            await state.refresh();
            return;
          }
          throw new Error("Those modules are already connected.");
        }
        if (
          model.createsFeedbackCycle(
            model.canonicalizeMachineEdges(edges, latest.disabledEdges ?? {})
              .edges,
            source,
            target,
          )
        ) {
          throw new Error(
            "Feedback loops are not supported. Choose a downstream module.",
          );
        }
        await stateCell.key("edges").push({
          id: edgeId,
          source,
          target,
        });
        await state.refresh();
      }),
    [runAction, state.refresh],
  );

  const disableEdge = React.useCallback(
    (edgeId: string) =>
      runAction(async () => {
        await stateCell.key("disabledEdges").key(edgeId).set(true);
        await state.refresh();
      }),
    [runAction, state.refresh],
  );

  const updatePreference = React.useCallback(
    <K extends keyof IframeOutputData>(
      key: K,
      update: (current: IframeOutputData[K]) => IframeOutputData[K],
    ) =>
      runAction(async () => {
        await model.updateLatestValue(outputCell.key(key), update);
        await output.refresh();
      }),
    [output.refresh, runAction],
  );

  const inputValue = input.status === "ready" ? input.value : undefined;
  const stateValue = state.status === "ready" ? state.value : undefined;
  const outputValue = output.status === "ready" ? output.value : undefined;
  const tracker = selectionRequestTracker.current;
  const selectedId = outputValue?.selectedNodeId ?? null;
  React.useEffect(() => tracker.reconcile(selectedId), [selectedId, tracker]);
  const ready = materialized && inputValue !== undefined &&
    stateValue !== undefined && outputValue !== undefined;

  const failure = [input, state, output].find(
    (resource) => resource.status === "error",
  );
  if (failure?.status === "error") {
    return <p className="fatal-error" role="alert">{failure.error.message}</p>;
  }
  if (initializationError) {
    return (
      <p className="fatal-error" role="alert">{initializationError.message}</p>
    );
  }

  if (!ready) {
    return (
      <main className="loading-view">
        <div className="loading-orbit" aria-hidden="true">⌁</div>
        <h1>{inputValue?.title ?? DEFAULT_INPUT.title}</h1>
        <p>Hydrating the shared workshop…</p>
        <button type="button" disabled>Loading machine</button>
      </main>
    );
  }

  const canonicalEdges = model.canonicalizeMachineEdges(
    stateValue.edges,
    stateValue.disabledEdges,
  );
  const machineState: IframeStateData = {
    ...stateValue,
    edges: canonicalEdges.edges,
  };
  const signals = model.evaluateSignals(
    machineState,
    outputValue.simulationTick,
  );
  const flowNodes: MachineFlowNode[] = stateValue.nodes.map((node) => ({
    id: node.id,
    type: node.kind,
    position: node.position,
    selected: outputValue.selectedNodeId === node.id,
    data: {
      node,
      signal: model.presentSignal(
        signals.get(node.id) ?? 0,
        outputValue.showSignals,
      ),
      disabled: (busyNodeCounts[node.id] ?? 0) > 0,
    },
    draggable: true,
    connectable: true,
    deletable: false,
    ariaLabel: `${KIND_LABELS[node.kind]}: ${node.label}`,
  }));
  const flowEdges: Edge[] = machineState.edges.map((edge) => {
    const signal = model.presentSignal(
      signals.get(edge.source) ?? 0,
      outputValue.showSignals,
    );
    const active = signal.highlighted;
    return {
      ...edge,
      type: "smoothstep",
      animated: active,
      markerEnd: {
        type: MarkerType.ArrowClosed,
        color: active ? "#b7ffea" : "#546279",
      },
      style: {
        stroke: active ? "#b7ffea" : "#546279",
        strokeWidth: active ? 3 : 1.5,
      },
      label: outputValue.showSignals ? signal.label : undefined,
      labelStyle: { fill: "#c7d3e6", fontWeight: 700, fontSize: 10 },
      labelBgStyle: { fill: "#111827", fillOpacity: 0.88 },
      labelBgPadding: [4, 2] as [number, number],
      labelBgBorderRadius: 4,
      selectable: false,
      deletable: false,
    };
  }).concat(canonicalEdges.suppressed.map((edge) => ({
    ...edge,
    type: "smoothstep",
    animated: false,
    markerEnd: {
      type: MarkerType.ArrowClosed,
      color: "#ff8f9f",
    },
    style: {
      stroke: "#ff8f9f",
      strokeDasharray: "7 5",
      strokeWidth: 2,
    },
    label: "Feedback conflict",
    labelStyle: { fill: "#ffd3da", fontWeight: 700, fontSize: 10 },
    labelBgStyle: { fill: "#37151d", fillOpacity: 0.92 },
    labelBgPadding: [4, 2] as [number, number],
    labelBgBorderRadius: 4,
    selectable: false,
    deletable: false,
  })));

  const selected = stateValue.nodes.find(
    (node) => node.id === outputValue.selectedNodeId,
  );
  const activeActuators =
    stateValue.nodes.filter((node) =>
      model.isActuatorFiring(node, signals.get(node.id) ?? 0)
    ).length;

  return (
    <NodeActionContext.Provider value={{ updateParameter }}>
      <main className="machine-app" data-testid="impossible-machine">
        <header className="app-header">
          <div>
            <p className="eyebrow">Shared workshop · Fabric is authoritative</p>
            <h1>{inputValue.title}</h1>
            <p>{inputValue.subtitle}</p>
          </div>
          <div className="telemetry" aria-live="polite">
            <span>{stateValue.nodes.length} modules</span>
            <span>{machineState.edges.length} wires</span>
            <strong>{activeActuators} firing</strong>
          </div>
        </header>

        <section className="toolbar" aria-label="Machine controls">
          <div className="add-controls">
            <span>Add</span>
            {(Object.keys(KIND_LABELS) as MachineNodeKind[]).map((kind) => (
              <button
                type="button"
                key={kind}
                data-add-kind={kind}
                disabled={pending}
                onClick={() => void appendNode(kind)}
              >
                <span aria-hidden="true">{KIND_ICONS[kind]}</span>
                {KIND_LABELS[kind]}
              </button>
            ))}
          </div>
          <div className="simulation-controls">
            <button
              type="button"
              data-action="previous-tick"
              aria-label="Previous simulation tick"
              disabled={pending || outputValue.simulationTick === 0}
              onClick={() =>
                void updatePreference(
                  "simulationTick",
                  (current) => Math.max(0, current - 1),
                )}
            >
              −
            </button>
            <output data-testid="simulation-tick">
              Tick {outputValue.simulationTick}
            </output>
            <button
              type="button"
              data-action="next-tick"
              aria-label="Next simulation tick"
              disabled={pending}
              onClick={() =>
                void updatePreference(
                  "simulationTick",
                  (current) => current + 1,
                )}
            >
              +
            </button>
            <button
              className={outputValue.showSignals ? "is-on" : ""}
              type="button"
              data-action="toggle-signals"
              aria-pressed={outputValue.showSignals}
              disabled={pending}
              onClick={() =>
                void updatePreference("showSignals", (current) => !current)}
            >
              Signal glow
            </button>
          </div>
        </section>

        <section className="workspace">
          <div className="flow-shell" aria-label="Collaborative machine canvas">
            <MachineCanvas
              authoritativeNodes={flowNodes}
              authoritativeSelection={outputValue.selectedNodeId}
              edges={flowEdges}
              onNodeSelection={(nodeId) =>
                tracker.request(
                  nodeId,
                  (selectedNodeId) =>
                    updatePreference(
                      "selectedNodeId",
                      () => selectedNodeId,
                    ),
                )}
              onPositionCommit={persistPosition}
              onConnect={(connection) => void appendEdge(connection)}
            />
          </div>

          <aside className="inspector">
            <div>
              <p className="eyebrow">Personal view</p>
              <h2>{selected?.label ?? "Select a module"}</h2>
              <p>
                {selected
                  ? `${KIND_LABELS[selected.kind]} · ${
                    model.presentSignal(
                      signals.get(selected.id) ?? 0,
                      outputValue.showSignals,
                    ).label
                  } signal`
                  : "Selection, tick, and signal glow follow your user identity."}
              </p>
            </div>

            <div className="wire-builder">
              <h3>Accessible wire builder</h3>
              <label>
                From
                <select
                  className="nodrag"
                  data-wire="source"
                  value={connectSource}
                  disabled={pending}
                  onChange={(event) =>
                    setConnectSource(event.currentTarget.value)}
                >
                  <option value="">Choose module</option>
                  {stateValue.nodes.filter((node) => node.kind !== "actuator")
                    .map((node) => (
                      <option key={node.id} value={node.id}>
                        {node.label}
                      </option>
                    ))}
                </select>
              </label>
              <label>
                To
                <select
                  className="nodrag"
                  data-wire="target"
                  value={connectTarget}
                  disabled={pending}
                  onChange={(event) =>
                    setConnectTarget(event.currentTarget.value)}
                >
                  <option value="">Choose module</option>
                  {stateValue.nodes.filter((node) => node.kind !== "sensor")
                    .map((node) => (
                      <option key={node.id} value={node.id}>
                        {node.label}
                      </option>
                    ))}
                </select>
              </label>
              <button
                type="button"
                data-action="connect-modules"
                disabled={pending || !connectSource || !connectTarget}
                onClick={() =>
                  void appendEdge({
                    source: connectSource,
                    target: connectTarget,
                  })}
              >
                Connect modules
              </button>
            </div>

            {canonicalEdges.suppressed.length > 0 && (
              <div className="wire-conflicts">
                <h3>Feedback conflicts</h3>
                <p>
                  These dashed wires arrived concurrently with an established
                  route. Remove one to clear the shared conflict.
                </p>
                {canonicalEdges.suppressed.map((edge) => (
                  <button
                    type="button"
                    key={edge.id}
                    data-remove-wire={edge.id}
                    disabled={pending}
                    onClick={() => void disableEdge(edge.id)}
                  >
                    Remove {edge.source} → {edge.target}
                  </button>
                ))}
              </div>
            )}

            <div className="legend">
              <h3>Signal legend</h3>
              <p>
                <i className="pulse pulse--high" /> High ≥ 50%
              </p>
              <p>
                <i className="pulse" /> Low &lt; 50%
              </p>
              <p>Delay modules read an earlier tick.</p>
              <p>
                Feedback loops are rejected. Established wires retain priority,
                and concurrent conflicts remain visible until removed.
              </p>
            </div>
          </aside>
        </section>

        <footer>
          <span id="machine-status">
            {pending ? "Committing to Fabric…" : "All controls are live"}
          </span>
          {canonicalEdges.suppressed.length > 0 && (
            <span className="action-error" role="status">
              {canonicalEdges.suppressed.length} concurrent feedback{" "}
              {canonicalEdges
                  .suppressed.length === 1
                ? "wire is"
                : "wires are"} awaiting conflict resolution
            </span>
          )}
          {actionError && (
            <span className="action-error" role="alert">
              {actionError.message}
            </span>
          )}
        </footer>
      </main>
    </NodeActionContext.Provider>
  );
}

const rootElement = document.querySelector<HTMLDivElement>("#root");
if (!rootElement) {
  throw new Error("Impossible Machine root element is missing.");
}
const root = createRoot(rootElement);
root.render(<App />);

globalThis.addEventListener("pagehide", () => {
  root.unmount();
  fabric.disconnect();
}, { once: true });