fusion/packages/dashboard/app/components/NodesView.tsx

import { useCallback, useEffect, useMemo, useState } from "react";
import { useTranslation } from "react-i18next";
import { Box, Plus, Server, Wifi, WifiOff, Globe, RefreshCw, X } from "lucide-react";
import "./NodesView.css";
import { useNodes } from "../hooks/useNodes";
import { useProjects } from "../hooks/useProjects";
import { useNodeSettingsSync, computeSyncState } from "../hooks/useNodeSettingsSync";
import { useMeshState } from "../hooks/useMeshState";
import { useMeshEngines } from "../hooks/useMeshEngines";
import type { ManagedDockerNodeInfo, NodeInfo, NodeUpdateInput } from "../api";
import { NodeCard } from "./NodeCard";
import { MeshTopology } from "./MeshTopology";
import { AddNodeModal, type AddNodeInput } from "./AddNodeModal";
import { DockerNodeOnboardingModal } from "./DockerNodeOnboardingModal";
import { NodeDetailModal } from "./NodeDetailModal";
import { useManagedDockerNodes } from "../hooks/useManagedDockerNodes";
import type { ManagedDockerNodeInput } from "@fusion/core";
import type { ToastType } from "../hooks/useToast";

interface NodesViewProps {
  addToast: (message: string, type?: ToastType) => void;
  onClose?: () => void;
}

/*
FNXC:Nodes 2026-06-19-00:00:
FN-6717 mounts Nodes inside Command Center while preserving the legacy overlay caller during migration/testing. The close affordance is overlay-only, so tab mode omits it when no onClose handler is provided.
*/
export function NodesView({ addToast, onClose }: NodesViewProps) {
  const { t } = useTranslation("app");
  const {
    nodes,
    loading,
    error,
    refresh,
    register,
    update,
    unregister,
    healthCheck,
    patchDockerConfig,
    fetchDockerDiff,
    discoverRemoteProjects,
  } = useNodes();
  const { projects, refresh: refreshProjects } = useProjects();
  const { meshState, loading: meshLoading, error: meshError } = useMeshState();
  const { engines, loading: enginesLoading, error: enginesError } = useMeshEngines();
  const { syncStatusMap, pushSettings, pullSettings, syncAuth, trackNode, getAuthSyncState, getAuthProviders } = useNodeSettingsSync();
  const {
    dockerNodes,
    loading: dockerLoading,
    refresh: refreshDocker,
    getContainerStatus,
    getLogs,
    create: createDockerNode,
  } = useManagedDockerNodes();
  const [addModalOpen, setAddModalOpen] = useState(false);
  const [dockerOnboardingOpen, setDockerOnboardingOpen] = useState(false);
  const [selectedNode, setSelectedNode] = useState<NodeInfo | null>(null);

  // Track remote nodes for sync status polling
  useEffect(() => {
    const remoteNodes = nodes.filter((node) => node.type === "remote");
    for (const node of remoteNodes) {
      trackNode(node.id);
    }
  }, [nodes, trackNode]);

  useEffect(() => {
    if (!selectedNode) return;
    const latest = nodes.find((node) => node.id === selectedNode.id) ?? null;
    setSelectedNode(latest);
  }, [nodes, selectedNode]);

  const stats = useMemo(() => {
    const total = nodes.length;
    const online = nodes.filter((node) => node.status === "online").length;
    const offline = nodes.filter((node) => node.status === "offline" || node.status === "error").length;
    const remote = nodes.filter((node) => node.type === "remote").length;
    const synced = nodes.filter(
      (node) => node.type === "remote" && syncStatusMap[node.id] && computeSyncState(syncStatusMap[node.id]).syncState === "synced"
    ).length;
    const docker = dockerNodes.length;
    return { total, online, offline, remote, synced, docker };
  }, [dockerNodes.length, nodes, syncStatusMap]);

  const handleRegister = useCallback(async (input: AddNodeInput) => {
    await register(input);
    await refreshProjects();
  }, [refreshProjects, register]);

  const handleCreateDockerNode = useCallback(async (input: ManagedDockerNodeInput) => {
    try {
      await createDockerNode(input);
      addToast(t("nodes.dockerNodeCreated", `Docker node "{{name}}" created`, { name: input.name }), "success");
      setDockerOnboardingOpen(false);
    } catch (err) {
      const message = err instanceof Error ? err.message : t("nodes.failedCreateDocker", "Failed to create Docker node");
      addToast(message, "error");
      throw err;
    }
  }, [addToast, createDockerNode, t]);

  const dockerNodeMap = useMemo(() => {
    const map = new Map<string, ManagedDockerNodeInfo>();
    for (const dockerNode of dockerNodes) {
      if (dockerNode.nodeId) {
        map.set(dockerNode.nodeId, dockerNode);
      }
    }
    return map;
  }, [dockerNodes]);

  const handleRefresh = useCallback(async () => {
    try {
      await Promise.all([refresh(), refreshDocker()]);
    } catch {
      addToast(t("nodes.failedRefresh", "Failed to refresh nodes"), "error");
    }
  }, [addToast, refresh, refreshDocker, t]);

  const handleHealthCheck = useCallback(async (id: string) => {
    try {
      await healthCheck(id);
      addToast(t("nodes.healthCheckComplete", "Node health check complete"), "success");
    } catch (err) {
      const message = err instanceof Error ? err.message : t("nodes.healthCheckFailed", "Health check failed");
      addToast(message, "error");
    }
  }, [addToast, healthCheck, t]);

  const handleUnregister = useCallback(async (id: string) => {
    try {
      await unregister(id);
      addToast(t("nodes.removed", "Node removed"), "success");
      if (selectedNode?.id === id) {
        setSelectedNode(null);
      }
    } catch (err) {
      const message = err instanceof Error ? err.message : t("nodes.failedRemove", "Failed to remove node");
      addToast(message, "error");
    }
  }, [addToast, selectedNode?.id, unregister, t]);

  const handleUpdate = useCallback(async (id: string, updates: NodeUpdateInput) => {
    await update(id, updates);
  }, [update]);

  return (
    <div className="nodes-view" data-testid="nodes-view">
      <div className="nodes-view-header">
        <div className="nodes-view-title">
          <h2>
            <Server size={20} />
            {t("nodes.heading", "Nodes")}
          </h2>
          <span className="nodes-view-count">{t("nodes.registeredCount", "{{count}} registered", { count: nodes.length })}</span>
        </div>

        <div className="nodes-view-actions">
          {onClose ? (
            <button
              className="btn-icon nodes-view-close"
              onClick={onClose}
              aria-label={t("nodes.closeAriaLabel", "Close nodes view")}
            >
              <X size={16} />
            </button>
          ) : null}
          <button className="btn btn-sm" onClick={() => void handleRefresh()} disabled={loading || dockerLoading}>
            <RefreshCw size={14} className={loading ? "spin" : ""} />
            {t("nodes.refresh", "Refresh")}
          </button>
          <button className="btn btn-sm" onClick={() => setAddModalOpen(true)}>
            <Plus size={14} />
            {t("nodes.addNode", "Add Node")}
          </button>
          <button className="btn btn-sm" onClick={() => setDockerOnboardingOpen(true)} title={t("nodes.addDockerNodeTitle", "Add a managed Docker node")}>
            <Box size={14} />
            {t("nodes.addDockerNode", "Add Docker Node")}
          </button>
        </div>
      </div>

      <div className="nodes-view-stats">
        <div className="nodes-view-stat" data-testid="nodes-stat-total">
          <span>{t("nodes.total", "Total")}</span>
          <strong>{stats.total}</strong>
        </div>
        <div className="nodes-view-stat nodes-view-stat--online" data-testid="nodes-stat-online">
          <span><Wifi size={14} /> {t("nodes.online", "Online")}</span>
          <strong>{stats.online}</strong>
        </div>
        <div className="nodes-view-stat nodes-view-stat--offline" data-testid="nodes-stat-offline">
          <span><WifiOff size={14} /> {t("nodes.offline", "Offline")}</span>
          <strong>{stats.offline}</strong>
        </div>
        <div className="nodes-view-stat" data-testid="nodes-stat-remote">
          <span><Globe size={14} /> {t("nodes.remote", "Remote")}</span>
          <strong>{stats.remote}</strong>
        </div>
        <div className="nodes-view-stat nodes-view-stat--synced" data-testid="nodes-stat-synced">
          <span><RefreshCw size={14} /> {t("nodes.synced", "Synced")}</span>
          <strong>{stats.synced}</strong>
        </div>
        <div className="nodes-view-stat" data-testid="nodes-stat-docker">
          <span><Box size={14} /> {t("nodes.docker", "Docker")}</span>
          <strong>{stats.docker}</strong>
        </div>
      </div>

      {(error || meshError || enginesError) && <div className="nodes-view-error">{error ?? meshError ?? enginesError}</div>}

      {/* Mesh Topology Visualization */}
      {!meshLoading && meshState.length > 0 && (
        <section className="nodes-view-topology" aria-label={t("nodes.meshTopologyAriaLabel", "Mesh Topology")}>
          <h3 className="nodes-view-section-title">{t("nodes.meshTopology", "Mesh Topology")}</h3>
          {/*
            FNXC:MeshSharedPg 2026-06-25-00:00:
            Pass active engine connections (read from shared PG via
            GET /api/mesh/engines) into MeshTopology so the view renders both the
            peer graph and the live engine runtime status. enginesLoading is
            tolerated: stale engine data is preferable to dropping the topology.
          */}
          <MeshTopology nodes={meshState} engines={!enginesLoading ? engines : undefined} />
        </section>
      )}

      {loading ? (
        <div className="nodes-view-grid">
          {Array.from({ length: 4 }).map((_, index) => (
            <div key={index} className="node-card node-card--loading" aria-hidden />
          ))}
        </div>
      ) : nodes.length === 0 ? (
        <div className="nodes-view-empty">
          <p>{t("nodes.noRegistered", "No nodes are registered yet.")}</p>
          <button className="btn btn-primary" onClick={() => setAddModalOpen(true)}>
            <Plus size={14} />
            {t("nodes.addFirstNode", "Add First Node")}
          </button>
        </div>
      ) : (
        <div className="nodes-view-grid">
          {nodes.map((node) => {
            const nodeSyncStatus = node.type === "remote" && syncStatusMap[node.id]
              ? computeSyncState(syncStatusMap[node.id])
              : undefined;
            return (
              <NodeCard
                key={node.id}
                node={node}
                projects={projects}
                onHealthCheck={(id) => { void handleHealthCheck(id); }}
                onEdit={(selected) => setSelectedNode(selected)}
                onRemove={(id) => { void handleUnregister(id); }}
                isLoading={loading}
                syncStatus={nodeSyncStatus}
                authSyncState={node.type === "remote" ? getAuthSyncState(node.id) : undefined}
                authSyncProviders={node.type === "remote" ? getAuthProviders(node.id) : undefined}
                managedDockerNode={dockerNodeMap.get(node.id)}
              />
            );
          })}
        </div>
      )}

      <AddNodeModal
        isOpen={addModalOpen}
        onClose={() => setAddModalOpen(false)}
        onSubmit={handleRegister}
        onDiscoverRemoteProjects={discoverRemoteProjects}
        addToast={addToast}
        projects={projects}
      />

      <DockerNodeOnboardingModal
        isOpen={dockerOnboardingOpen}
        onClose={() => setDockerOnboardingOpen(false)}
        onSubmit={handleCreateDockerNode}
        addToast={addToast}
      />

      <NodeDetailModal
        isOpen={selectedNode !== null}
        onClose={() => setSelectedNode(null)}
        node={selectedNode}
        projects={projects}
        onUpdate={handleUpdate}
        onHealthCheck={handleHealthCheck}
        addToast={addToast}
        syncStatus={selectedNode?.type === "remote" && selectedNode && syncStatusMap[selectedNode.id]
          ? computeSyncState(syncStatusMap[selectedNode.id])
          : undefined}
        onPushSettings={pushSettings}
        onPullSettings={pullSettings}
        onSyncAuth={syncAuth}
        managedDockerNode={selectedNode ? dockerNodeMap.get(selectedNode.id) : undefined}
        onFetchContainerStatus={getContainerStatus}
        onFetchLogs={getLogs}
        onUpdateDockerConfig={patchDockerConfig}
        onFetchDockerConfigDiff={fetchDockerDiff}
      />
    </div>
  );
}