/* eslint-disable react-refresh/only-export-components */
import {
  Box,
  Boxes,
  Braces,
  FolderSearch,
  HardDrive,
  LayoutDashboard,
  LayoutGrid,
  LayoutPanelLeft,
  MessagesSquare,
  Monitor,
  MousePointerClick,
  Network,
  Server,
  Settings,
  Terminal,
  Usb,
  User,
  Activity,
  TerminalSquare,
  Layers, // --- tmux-monitor ---
  Clock,
  Fingerprint,
  Hammer,
  Play,
  Plug,
  ScrollText,
  Sparkles,
  Workflow,
} from "lucide-react";
import { lazy, Suspense } from "react";
import { useTranslation } from "react-i18next";
import type { SerialHandle } from "@/features/serial/serial-types";
import type {
  TerminalHandle,
  TerminalHostConfig,
} from "@/features/terminal/Terminal";
import type { GuacamoleAppHandle } from "@/features/guacamole/GuacamoleApp";
import { useIsMobile } from "@/hooks/use-mobile";
import type { Tab, TabType, Host } from "@/types/ui-types";
import type { SSHHost } from "@/types";
import { useTabsSafe } from "@/shell/TabContext";
import {
  markAdaptiveResourceUsed,
  runAdaptiveBackgroundTask,
} from "@/lib/adaptive-resource-budget";

// Heavy tab surfaces — keep out of the AppShell critical path.
const CommandHistoryProvider = lazy(() =>
  import("@/features/terminal/command-history/CommandHistoryContext").then(
    (m) => ({ default: m.CommandHistoryProvider }),
  ),
);
const loadTerminalFeature = () =>
  import("@/features/terminal/Terminal").then((m) => ({
    default: m.Terminal,
  }));
const TerminalFeature = lazy(loadTerminalFeature);
const LocalTerminal = lazy(() =>
  import("@/features/local-terminal/LocalTerminal").then((m) => ({
    default: m.LocalTerminal,
  })),
);
const MobileTerminalKeyboard = lazy(() =>
  import("@/features/terminal/MobileTerminalKeyboard").then((m) => ({
    default: m.MobileTerminalKeyboard,
  })),
);
const loadFileManager = () =>
  import("@/features/file-manager/FileManager").then((m) => ({
    default: m.FileManager,
  }));
const FileManager = lazy(loadFileManager);
const loadDockerManager = () =>
  import("@/features/docker/DockerManager").then((m) => ({
    default: m.DockerManager,
  }));
const DockerManager = lazy(loadDockerManager);
const loadHostMetricsTab = () =>
  import("@/features/host-metrics/HostMetricsTab").then((m) => ({
    default: m.HostMetricsTab,
  }));
const HostMetricsTab = lazy(loadHostMetricsTab);
const loadProxmoxStatsTab = () =>
  import("@/features/proxmox-stats/ProxmoxStatsTab").then((m) => ({
    default: m.ProxmoxStatsTab,
  }));
const ProxmoxStatsTab = lazy(loadProxmoxStatsTab);
const loadTmuxMonitor = () =>
  import("@/features/tmux-monitor/TmuxMonitor").then((m) => ({
    default: m.TmuxMonitor,
  }));
const TmuxMonitor = lazy(loadTmuxMonitor);
const loadGuacamoleApp = () =>
  import("@/features/guacamole/GuacamoleApp").then((m) => ({
    default: m.default,
  }));
const GuacamoleApp = lazy(loadGuacamoleApp);
const DashboardTab = lazy(() =>
  import("@/dashboard/DashboardTab").then((m) => ({
    default: m.DashboardTab,
  })),
);
const HomepageCanvas = lazy(() =>
  import("@/features/homepage/HomepageCanvas").then((m) => ({
    default: m.HomepageCanvas,
  })),
);
const loadTunnelTab = () =>
  import("@/features/tunnel/TunnelTab").then((m) => ({
    default: m.TunnelTab,
  }));
const TunnelTab = lazy(loadTunnelTab);
const NetworkGraphCard = lazy(() =>
  import("@/dashboard/cards/NetworkGraphCard").then((m) => ({
    default: m.NetworkGraphCard,
  })),
);
const Serial = lazy(() =>
  import("@/features/serial/Serial").then((m) => ({
    default: m.Serial,
  })),
);
const FleetInventoryTab = lazy(() =>
  import("@/sidebar/FleetInventoryTab").then((m) => ({
    default: m.FleetInventoryTab,
  })),
);

// Rail panels promoted to full tabs.
const TermixIdPanel = lazy(() =>
  import("@/sidebar/TermixIdPanel").then((m) => ({ default: m.TermixIdPanel })),
);
const AlertsPanel = lazy(() =>
  import("@/sidebar/AlertsPanel").then((m) => ({ default: m.AlertsPanel })),
);
const SessionLogsPanel = lazy(() =>
  import("@/sidebar/SessionLogsPanel").then((m) => ({
    default: m.SessionLogsPanel,
  })),
);
const SnippetsPanel = lazy(() =>
  import("@/sidebar/SnippetsPanel").then((m) => ({ default: m.SnippetsPanel })),
);
const MacrosPanel = lazy(() =>
  import("@/sidebar/MacrosPanel").then((m) => ({ default: m.MacrosPanel })),
);
const HistoryPanel = lazy(() =>
  import("@/sidebar/HistoryPanel").then((m) => ({ default: m.HistoryPanel })),
);
const SshToolsPanel = lazy(() =>
  import("@/sidebar/SshToolsPanel").then((m) => ({ default: m.SshToolsPanel })),
);
const AutomationsPanel = lazy(() =>
  import("@/sidebar/AutomationsPanel").then((m) => ({
    default: m.AutomationsPanel,
  })),
);

const AiPanel = lazy(() =>
  import("@/features/ai/AiPanel").then((m) => ({
    default: m.AiPanel,
  })),
);

const tabSurfaceLoaders: Partial<Record<TabType, () => Promise<unknown>>> = {
  terminal: loadTerminalFeature,
  files: loadFileManager,
  docker: loadDockerManager,
  "host-metrics": loadHostMetricsTab,
  "proxmox-stats": loadProxmoxStatsTab,
  tmux_monitor: loadTmuxMonitor,
  tunnel: loadTunnelTab,
  rdp: loadGuacamoleApp,
  vnc: loadGuacamoleApp,
  telnet: loadGuacamoleApp,
};

/** Download a likely next tab without starting a connection or mounting UI. */
export function preloadTabSurface(type: TabType): void {
  const loader = tabSurfaceLoaders[type];
  if (loader) runAdaptiveBackgroundTask("module", `tab:${type}`, loader);
}

export function markTabSurfaceUsed(type: TabType): void {
  markAdaptiveResourceUsed("module", `tab:${type}`);
}

function hostToSSHHost(h: Host): SSHHost {
  return {
    id: parseInt(h.id, 10),
    name: h.name,
    ip: h.ip,
    port: h.port,
    username: h.username,
    folder: h.folder ?? "",
    tags: h.tags ?? [],
    pin: h.pin ?? false,
    authType: h.authType,
    password: h.password,
    hasPassword: h.hasPassword,
    key: h.key,
    keyPassword: h.keyPassword,
    hasKey: h.hasKey,
    hasKeyPassword: h.hasKeyPassword,
    keyType: h.keyType,
    credentialId: h.credentialId ? parseInt(h.credentialId, 10) : undefined,
    terminalConfig: h.terminalConfig,
    hasSudoPassword: h.hasSudoPassword,
    enableTerminal: h.enableTerminal ?? false,
    enableTunnel: h.enableTunnel ?? false,
    enableFileManager: h.enableFileManager ?? false,
    enableDocker: h.enableDocker ?? false,
    dockerConfig: h.dockerConfig ?? null,
    showTerminalInSidebar: true,
    showFileManagerInSidebar: true,
    showTunnelInSidebar: true,
    showDockerInSidebar: true,
    showServerStatsInSidebar: true,
    defaultPath: h.defaultPath ?? "",
    tunnelConnections: [],
    connectionType: "ssh",
    connectionOrigin: h.connectionOrigin ?? null,
    // Carries the host's identity to a delegated backend. Without it the
    // remote side resolves our local row id against its own table.
    syncId: h.syncId ?? null,
    createdAt: "",
    updatedAt: "",
  } as unknown as SSHHost;
}

function EmptyState({
  icon: Icon,
  messageKey,
}: {
  icon: React.ElementType;
  messageKey: string;
}) {
  const { t } = useTranslation();
  return (
    <div className="flex flex-col items-center justify-center flex-1 gap-3 p-6 text-center">
      <div className="size-10 rounded-full bg-muted/40 flex items-center justify-center">
        <Icon className="size-5 text-muted-foreground/30" />
      </div>
      <span className="text-sm font-semibold text-muted-foreground/60">
        {t(messageKey)}
      </span>
    </div>
  );
}

function TabChunkFallback() {
  return (
    <div className="flex h-full w-full items-center justify-center bg-background">
      <div className="size-5 rounded-full border-2 border-muted-foreground/30 border-t-muted-foreground/70 animate-spin" />
    </div>
  );
}

function withTabSuspense(node: React.ReactNode) {
  return <Suspense fallback={<TabChunkFallback />}>{node}</Suspense>;
}

/**
 * Host frame for rail panels opened as tabs. Panels expect a full-height flex
 * column like the sidebar gives them. The max width keeps forms readable on a
 * wide monitor instead of stretching them edge to edge.
 */
function PanelTabFrame({ children }: { children: React.ReactNode }) {
  return (
    <div className="flex h-full w-full justify-center overflow-y-auto bg-background">
      <div className="flex flex-col flex-1 min-h-0 w-full max-w-5xl">
        {children}
      </div>
    </div>
  );
}

export function tabIcon(type: TabType) {
  switch (type) {
    case "dashboard":
      return <LayoutDashboard className="size-3.5" />;
    case "terminal":
      return <Terminal className="size-3.5" />;
    case "local-terminal":
      return <TerminalSquare className="size-3.5" />;
    case "rdp":
      return <Monitor className="size-3.5" />;
    case "vnc":
      return <MousePointerClick className="size-3.5" />;
    case "telnet":
      return <MessagesSquare className="size-3.5" />;
    case "host-metrics":
      return <Server className="size-3.5" />;
    case "proxmox-stats":
      return <HardDrive className="size-3.5" />;
    case "files":
      return <FolderSearch className="size-3.5" />;
    case "host-manager":
      return <Server className="size-3.5" />;
    case "user-profile":
      return <User className="size-3.5" />;
    case "admin-settings":
      return <Settings className="size-3.5" />;
    case "docker":
      return <Box className="size-3.5" />;
    case "tunnel":
      return <Network className="size-3.5" />;
    case "network_graph":
      return <Network className="size-3.5" />;
    // --- tmux-monitor ---
    case "tmux_monitor":
      return <Layers className="size-3.5" />;
    case "serial":
      return <Usb className="size-3.5" />;
    case "homepage":
      return <LayoutGrid className="size-3.5" />;
    case "fleet-inventory":
      return <Boxes className="size-3.5" />;
    case "termix-id":
      return <Fingerprint className="size-3.5" />;
    case "alerts":
      return <Plug className="size-3.5" />;
    case "session-logs":
      return <ScrollText className="size-3.5" />;
    case "snippets":
      return <Play className="size-3.5" />;
    case "macros":
      return <Braces className="size-3.5" />;
    case "history":
      return <Clock className="size-3.5" />;
    case "ssh-tools":
      return <Hammer className="size-3.5" />;
    case "automations":
      return <Workflow className="size-3.5" />;
    case "ai":
      return <Sparkles className="size-3.5" />;
    case "split-screen":
      return <LayoutPanelLeft className="size-3.5" />;
  }
}

function TerminalTabContent({
  tab,
  host,
  label,
  isVisible,
  isFocusedPane,
  onCloseTab,
  onRenameTab,
  onOpenFileInEditor,
  onOpenFileManager,
  onOpenTab,
  onSaveQuickConnect,
}: {
  tab: Tab;
  host: Host;
  label: string;
  isVisible: boolean;
  isFocusedPane: boolean;
  onCloseTab?: (id: string) => void;
  onRenameTab?: (tabId: string, newLabel: string) => void;
  onOpenFileInEditor?: (filePath: string) => void;
  onOpenFileManager?: (path?: string) => void;
  onOpenTab?: (type: TabType) => void;
  onSaveQuickConnect?: () => Promise<void>;
}) {
  const { previewTerminalTheme } = useTabsSafe();
  const isMobile = useIsMobile();
  return withTabSuspense(
    <CommandHistoryProvider>
      <div className="flex flex-col h-full w-full">
        <div className="flex-1 min-h-0">
          <TerminalFeature
            ref={tab.terminalRef as React.Ref<TerminalHandle>}
            hostConfig={
              {
                ...hostToSSHHost(host),
                sshPort: host.sshPort ?? host.port,
                instanceId: tab.instanceId ?? tab.id,
                restoredSessionId: tab.restoredSessionId ?? null,
                joinSharedSessionId: tab.joinSharedSessionId ?? null,
                joinShareId: tab.joinShareId ?? null,
              } as TerminalHostConfig
            }
            isVisible={isVisible}
            initialPath={tab.initialFilePath}
            title={label}
            showTitle={false}
            splitScreen={false}
            onClose={() => onCloseTab?.(tab.id)}
            onTitleChange={
              onRenameTab && host.terminalConfig?.useSSHTitle
                ? (title) => onRenameTab(tab.id, title)
                : undefined
            }
            previewTheme={previewTerminalTheme}
            onOpenFileInEditor={onOpenFileInEditor}
            onOpenFileManager={onOpenFileManager}
            isQuickConnect={host.id.startsWith("quick-connect-")}
            onSaveQuickConnect={onSaveQuickConnect}
            host={host}
            onOpenTab={onOpenTab}
            isFocusedPane={isFocusedPane}
          />
        </div>
        {isMobile && (
          <MobileTerminalKeyboard
            terminalRef={
              tab.terminalRef as React.RefObject<TerminalHandle | null>
            }
          />
        )}
      </div>
    </CommandHistoryProvider>,
  );
}

/**
 * Everything the promoted rail panels need from AppShell. Passed as one bag
 * rather than more positional params, which renderTabContent already has too
 * many of.
 */
export type PromotedPanelProps = {
  terminalTabs?: Tab[];
  targetTerminalTabId?: string;
  storageMode?: "local" | "cloud";
};

export function renderTabContent(
  tab: Tab,
  onOpenSingletonTab?: (type: TabType) => void,
  onOpenTab?: (host: Host, type: TabType) => void,
  onCloseTab?: (id: string) => void,
  isVisible = true,
  onOpenFileInEditor?: (host: Host, filePath: string) => void,
  onOpenFileManager?: (host: Host, path?: string) => void,
  onOpenTerminalTab?: (host: Host, path?: string) => void,
  onRenameTab?: (tabId: string, newLabel: string) => void,
  onSaveQuickConnect?: (tab: Tab, host: Host) => Promise<void>,
  isFocusedPane = true,
  panelProps?: PromotedPanelProps,
) {
  const { host, label } = tab;

  switch (tab.type) {
    case "dashboard":
      return withTabSuspense(
        <DashboardTab
          onOpenSingletonTab={onOpenSingletonTab!}
          onOpenTab={onOpenTab!}
          isVisible={isVisible}
        />,
      );

    case "terminal":
      if (!host)
        return (
          <EmptyState
            icon={TerminalSquare}
            messageKey="terminal.noHostSelected"
          />
        );
      return (
        <TerminalTabContent
          tab={tab}
          host={host}
          label={label}
          isVisible={isVisible}
          isFocusedPane={isFocusedPane}
          onCloseTab={onCloseTab}
          onRenameTab={onRenameTab}
          onOpenFileInEditor={
            onOpenFileInEditor
              ? (fp) => onOpenFileInEditor(host, fp)
              : undefined
          }
          onOpenFileManager={
            onOpenFileManager ? (p) => onOpenFileManager(host, p) : undefined
          }
          onOpenTab={onOpenTab ? (type) => onOpenTab(host, type) : undefined}
          onSaveQuickConnect={
            onSaveQuickConnect ? () => onSaveQuickConnect(tab, host) : undefined
          }
        />
      );

    case "local-terminal":
      return withTabSuspense(
        <LocalTerminal instanceId={tab.instanceId} isVisible={isVisible} />,
      );

    case "files":
      if (!host)
        return (
          <EmptyState
            icon={FolderSearch}
            messageKey="fileManager.noHostSelected"
          />
        );
      return withTabSuspense(
        <FileManager
          initialHost={hostToSSHHost(host)}
          initialFilePath={tab.initialFilePath}
          initialPath={tab.initialPath}
          isVisible={isVisible}
          onOpenTerminalTab={
            onOpenTerminalTab
              ? (path) => onOpenTerminalTab(host, path)
              : undefined
          }
        />,
      );

    case "docker":
      if (!host)
        return <EmptyState icon={Box} messageKey="docker.noHostSelected" />;
      return withTabSuspense(
        <DockerManager
          hostConfig={hostToSSHHost(host)}
          title={label}
          isVisible={isVisible}
          isTopbarOpen={false}
          embedded={true}
        />,
      );

    case "host-metrics":
      if (!host)
        return (
          <EmptyState icon={Activity} messageKey="hostMetrics.noHostSelected" />
        );
      return withTabSuspense(
        <HostMetricsTab
          hostConfig={hostToSSHHost(host)}
          title={label}
          isVisible={isVisible}
          isTopbarOpen={false}
          embedded={true}
        />,
      );

    case "proxmox-stats":
      if (!host)
        return (
          <EmptyState
            icon={HardDrive}
            messageKey="proxmoxStats.noHostSelected"
          />
        );
      return withTabSuspense(
        <ProxmoxStatsTab
          hostConfig={hostToSSHHost(host)}
          title={label}
          isVisible={isVisible}
          isTopbarOpen={false}
          embedded={true}
        />,
      );

    case "tunnel":
      return withTabSuspense(
        <TunnelTab label={label} host={host} isVisible={isVisible} />,
      );

    case "rdp":
    case "vnc":
    case "telnet":
      if (!host)
        return (
          <EmptyState icon={Monitor} messageKey="guacamole.noHostSelected" />
        );
      return withTabSuspense(
        <GuacamoleApp
          ref={tab.terminalRef as React.Ref<GuacamoleAppHandle>}
          hostId={host.id}
          tabId={tab.id}
          protocol={tab.type as "rdp" | "vnc" | "telnet"}
          isVisible={isVisible}
        />,
      );

    case "network_graph":
      return withTabSuspense(
        <NetworkGraphCard embedded={false} isVisible={isVisible} />,
      );

    // --- tmux-monitor ---
    case "tmux_monitor":
      return withTabSuspense(
        <TmuxMonitor
          initialHostId={host ? parseInt(host.id, 10) : undefined}
          isVisible={isVisible}
        />,
      );

    case "serial":
      if (!tab.serialConfig)
        return <EmptyState icon={Usb} messageKey="serial.notSupportedTitle" />;
      return withTabSuspense(
        <Serial
          ref={tab.terminalRef as React.Ref<SerialHandle>}
          config={tab.serialConfig}
          isVisible={isVisible}
          instanceId={tab.instanceId}
        />,
      );

    case "homepage":
      return withTabSuspense(<HomepageCanvas />);

    case "fleet-inventory":
      return withTabSuspense(
        <FleetInventoryTab fleetId={tab.fleetId} isVisible={isVisible} />,
      );

    case "termix-id":
      return withTabSuspense(
        <PanelTabFrame>
          <TermixIdPanel />
        </PanelTabFrame>,
      );

    case "alerts":
      return withTabSuspense(
        <PanelTabFrame>
          <AlertsPanel />
        </PanelTabFrame>,
      );

    case "session-logs":
      return withTabSuspense(
        <PanelTabFrame>
          <SessionLogsPanel />
        </PanelTabFrame>,
      );

    case "automations":
      return withTabSuspense(
        <PanelTabFrame>
          <AutomationsPanel active={isVisible} />
        </PanelTabFrame>,
      );

    case "ai":
      return withTabSuspense(
        <PanelTabFrame>
          <AiPanel />
        </PanelTabFrame>,
      );

    case "split-screen":
      return null;

    case "snippets":
      return withTabSuspense(
        <PanelTabFrame>
          <SnippetsPanel
            terminalTabs={panelProps?.terminalTabs ?? []}
            activeTabId={panelProps?.targetTerminalTabId ?? ""}
            storageMode={panelProps?.storageMode ?? "local"}
          />
        </PanelTabFrame>,
      );

    case "macros":
      return withTabSuspense(
        <PanelTabFrame>
          <MacrosPanel
            terminalTabs={panelProps?.terminalTabs ?? []}
            activeTabId={panelProps?.targetTerminalTabId ?? ""}
            storageMode={panelProps?.storageMode ?? "local"}
          />
        </PanelTabFrame>,
      );

    case "history":
      return withTabSuspense(
        <PanelTabFrame>
          <HistoryPanel
            terminalTabs={panelProps?.terminalTabs ?? []}
            activeTabId={panelProps?.targetTerminalTabId ?? ""}
          />
        </PanelTabFrame>,
      );

    case "ssh-tools":
      return withTabSuspense(
        <PanelTabFrame>
          <SshToolsPanel
            terminalTabs={panelProps?.terminalTabs ?? []}
            activeTabId={panelProps?.targetTerminalTabId ?? ""}
          />
        </PanelTabFrame>,
      );

    case "host-manager":
    case "user-profile":
    case "admin-settings":
      return null;
  }
}
