import { useEffect, useState, type RefObject } from 'react';
import {
  DEFAULT_VIEWER_DISPLAY_OPTIONS,
  type ViewerDisplayOptions,
} from '../../viewer/displayOptions';
import { dispatchLayoutWidths, type LayoutPreset } from '../components/LayoutSettingsDialog';
import type { WorkspaceTool } from '../components/WorkspaceToolsPanel';
import { useSidebarLayout } from './useSidebarLayout';
import { useThemePreference } from './useThemePreference';

function initialDisplayOptions(): ViewerDisplayOptions {
  try {
    const stored = JSON.parse(
      localStorage.getItem('mujoco-platform-display') ?? 'null',
    ) as Partial<ViewerDisplayOptions> | null;
    if (!stored) return { ...DEFAULT_VIEWER_DISPLAY_OPTIONS };
    const next = { ...DEFAULT_VIEWER_DISPLAY_OPTIONS };
    for (const key of Object.keys(next) as (keyof ViewerDisplayOptions)[])
      if (typeof stored[key] === 'boolean') next[key] = stored[key];
    return next;
  } catch {
    return { ...DEFAULT_VIEWER_DISPLAY_OPTIONS };
  }
}

/** 仅持有工作台界面状态；不加载模型、不创建 Viewer、不持有物理时钟。 */
export function useWorkbenchChrome(root: RefObject<HTMLDivElement | null>) {
  const sidebars = useSidebarLayout();
  const { setLeftOpen, setRightOpen } = sidebars;
  const [theme, setTheme] = useThemePreference();
  const [forceScale, setForceScale] = useState(50),
    [helpOpen, setHelpOpen] = useState(false),
    [commandOpen, setCommandOpen] = useState(false),
    [sourceOpen, setSourceOpen] = useState(false),
    [removeConfirmOpen, setRemoveConfirmOpen] = useState(false),
    [fullscreen, setFullscreen] = useState(false),
    [settingsOpen, setSettingsOpen] = useState(false),
    [layoutOpen, setLayoutOpen] = useState(false),
    [diagnosticsOpen, setDiagnosticsOpen] = useState(false),
    [workspaceTool, setWorkspaceTool] = useState<WorkspaceTool | null>(null),
    [displayOptions, setDisplayOptions] = useState<ViewerDisplayOptions>(initialDisplayOptions),
    [showSensorCamera, setShowSensorCamera] = useState(true),
    [jointAdvanced, setJointAdvanced] = useState(false),
    [angleUnit, setAngleUnit] = useState<'rad' | 'deg'>('rad');
  useEffect(() => {
    const change = () => setFullscreen(document.fullscreenElement === root.current);
    document.addEventListener('fullscreenchange', change);
    return () => document.removeEventListener('fullscreenchange', change);
  }, [root]);
  const toggleFullscreen = () => {
    if (document.fullscreenElement) void document.exitFullscreen().catch(() => {});
    else if (root.current) void root.current.requestFullscreen().catch(() => {});
  };
  const showWorkspaceTool = (tool: WorkspaceTool) => {
    setWorkspaceTool(tool);
    setRightOpen(true);
  };
  const applyLayoutPreset = (preset: LayoutPreset) => {
    if (preset === 'viewport') {
      setLeftOpen(false);
      setRightOpen(false);
      dispatchLayoutWidths(288, 288);
    } else if (preset === 'project') {
      setLeftOpen(true);
      setRightOpen(false);
      dispatchLayoutWidths(384, 288);
    } else if (preset === 'control') {
      setLeftOpen(false);
      setRightOpen(true);
      setWorkspaceTool('controls');
      dispatchLayoutWidths(288, 384);
    } else {
      setLeftOpen(true);
      setRightOpen(true);
      dispatchLayoutWidths(288, 288);
    }
  };
  return {
    ...sidebars,
    theme,
    setTheme,
    forceScale,
    setForceScale,
    helpOpen,
    setHelpOpen,
    commandOpen,
    setCommandOpen,
    sourceOpen,
    setSourceOpen,
    removeConfirmOpen,
    setRemoveConfirmOpen,
    fullscreen,
    toggleFullscreen,
    settingsOpen,
    setSettingsOpen,
    layoutOpen,
    setLayoutOpen,
    diagnosticsOpen,
    setDiagnosticsOpen,
    workspaceTool,
    setWorkspaceTool,
    showWorkspaceTool,
    displayOptions,
    setDisplayOptions,
    showSensorCamera,
    setShowSensorCamera,
    jointAdvanced,
    setJointAdvanced,
    angleUnit,
    setAngleUnit,
    applyLayoutPreset,
  };
}