studio/src/App.jsx

import { useNavigate, useLocation, Link } from 'react-router-dom';
import { useAuth } from './context/AuthContext.jsx';
import React, { useState, useEffect, useCallback } from 'react';
import { api } from './api/client';
import Navbar from './components/Navbar';
import WorkspaceHub from './components/WorkspaceHub';
import WorkspaceEmptyState from './components/WorkspaceEmptyState';
import SemanticDiffViewer from './components/SemanticDiffViewer';
import PRReviewDeck from './components/PRReviewDeck';
import IngestionStaging from './components/IngestionStaging';
import KnowledgeGraph from './components/KnowledgeGraph';
import KnowledgeBase from './components/KnowledgeBase';
import PolicyRulesLab from './components/PolicyRulesLab';
import AuditLog from './components/AuditLog';
import AccessManagementModal from './components/AccessManagementModal';
import GlobalSearchModal from './components/GlobalSearchModal';
import UserProfileView from './components/UserProfileView';
import CreateWorkspacePage from './components/CreateWorkspacePage';
import { RefreshCw, CheckCircle2, AlertCircle, Sparkles, GitBranch, ArrowLeft } from 'lucide-react';

export default function App() {
  const { isAuthenticated, logout: authLogout, user: authUser } = useAuth();
  const navigate = useNavigate();
  const location = useLocation();

  const [workspaces, setWorkspaces] = useState([]);
  const [currentWorkspace, setCurrentWorkspace] = useState(null); // Defaults to null -> shows WorkspaceHub!
  const [activeTab, setActiveTab] = useState('diff');
  const [currentUser, setCurrentUser] = useState(null);
  const [searchQuery, setSearchQuery] = useState('');
  const [dismissedEmptyStateFor, setDismissedEmptyStateFor] = useState(null);
  const [showAccessModal, setShowAccessModal] = useState(false);
  const [showGlobalSearch, setShowGlobalSearch] = useState(false);
  const [selectedProfileUser, setSelectedProfileUser] = useState(null);

  // State data
  const [stats, setStats] = useState(null);
  const [documents, setDocuments] = useState([]);
  const [proposals, setProposals] = useState([]);
  const [diff, setDiff] = useState(null);
  const [graphData, setGraphData] = useState(null);
  const [knowledgeItems, setKnowledgeItems] = useState([]);
  const [rules, setRules] = useState([]);
  const [activity, setActivity] = useState([]);

  const [loading, setLoading] = useState(false);
  const [refreshing, setRefreshing] = useState(false);
  const [toast, setToast] = useState(null);

  const showToast = (message, type = 'success') => {
    setToast({ message, type });
    setTimeout(() => setToast(null), 3500);
  };

  // Global Ctrl+K / Cmd+K listener for global search
  useEffect(() => {
    const handleKeyDown = (e) => {
      if ((e.ctrlKey || e.metaKey) && e.key.toLowerCase() === 'k') {
        e.preventDefault();
        setShowGlobalSearch((prev) => !prev);
      }
    };
    window.addEventListener('keydown', handleKeyDown);
    return () => window.removeEventListener('keydown', handleKeyDown);
  }, []);

  // Initial load: fetch workspaces & user identity
  useEffect(() => {
    async function init() {
      try {
        const wsList = await api.getWorkspaces();
        setWorkspaces(Array.isArray(wsList) ? wsList : []);
      } catch (err) {
        showToast(`Connecting to DiffWeave FastMCP Bridge...`, 'info');
      }

      const localUser = api.getCurrentUser();
      if (localUser) setCurrentUser(localUser);
    }
    init();
  }, []);

  // Parse deep URL parameters for native browser Back/Forward & direct opening
  const pathname = location.pathname;
  const isNewWorkspacePage = pathname === '/new' || pathname === '/workspaces/new';
  const pathParts = pathname.split('/').filter(Boolean);
  const isWsPath = pathParts[0] === 'workspaces' && pathParts[1] !== 'new';
  const urlWsId = isWsPath ? pathParts[1] : null;
  const urlTab = isWsPath ? (pathParts[2] || 'diff') : 'diff';
  const urlProposalId = (isWsPath && pathParts[2] === 'prs') ? pathParts[3] : null;

  const isProfilePage = pathname === '/profile' || pathname.startsWith('/users/') || pathname.startsWith('/u/');
  const profileUserId = isProfilePage ? (pathParts[1] || currentUser?.id || currentUser?.username) : null;

  // Synchronize state whenever URL or workspaces change
  useEffect(() => {
    if (isNewWorkspacePage) {
      if (currentWorkspace !== null) {
        setCurrentWorkspace(null);
      }
    } else if (urlWsId) {
      const match = workspaces.find((w) => w.id === urlWsId);
      if (match) {
        if (!currentWorkspace || currentWorkspace.id !== match.id) {
          setCurrentWorkspace(match);
        }
      } else {
        // Fallback placeholder while workspaces load or if direct deep link
        if (!currentWorkspace || currentWorkspace.id !== urlWsId) {
          setCurrentWorkspace({ id: urlWsId, name: urlWsId, d_count: 0, k_count: 0 });
        }
      }

      if (urlTab && activeTab !== urlTab) {
        setActiveTab(urlTab);
      }
    } else if (pathname === '/' || pathname === '/workspaces' || pathname === '/profile' || pathname === '/settings') {
      if (currentWorkspace !== null) {
        setCurrentWorkspace(null);
      }
    }
  }, [pathname, isNewWorkspacePage, urlWsId, urlTab, workspaces]);

  // Update currentWorkspace reference if workspaces list gets fresh counts
  useEffect(() => {
    if (currentWorkspace?.id && workspaces.length > 0) {
      const fresh = workspaces.find((w) => w.id === currentWorkspace.id);
      if (fresh && (fresh.name !== currentWorkspace.name || fresh.d_count !== currentWorkspace.d_count || fresh.k_count !== currentWorkspace.k_count)) {
        setCurrentWorkspace((prev) => prev ? { ...prev, ...fresh } : fresh);
      }
    }
  }, [workspaces]);

  // Fetch workspace details based on active tab
  const refreshData = useCallback(async () => {
    if (!currentWorkspace?.id) return;
    const wsId = currentWorkspace.id;
    setRefreshing(true);

    try {
      if (activeTab === 'diff') {
        const diffRes = await api.getSemanticDiff(wsId);
        setDiff(diffRes);
      }
      if (activeTab === 'prs') {
        const prsRes = await api.getProposals(wsId);
        setProposals(Array.isArray(prsRes) ? prsRes : []);
      }
      if (activeTab === 'staging') {
        const docsRes = await api.getDocuments(wsId);
        setDocuments(Array.isArray(docsRes) ? docsRes : []);
      }
      if (activeTab === 'graph') {
        const graphRes = await api.getKnowledgeGraph(wsId);
        setGraphData(graphRes);
      }
      if (activeTab === 'knowledge') {
        const kRes = await api.getKnowledgeItems(wsId);
        setKnowledgeItems(Array.isArray(kRes) ? kRes : []);
      }
      if (activeTab === 'rules') {
        const rulesRes = await api.getRules(wsId);
        setRules(Array.isArray(rulesRes) ? rulesRes : []);
      }
      if (activeTab === 'audit') {
        const actRes = await api.getActivityFeed(wsId);
        setActivity(Array.isArray(actRes) ? actRes : []);
      }

      // Background status fetch for navbar counters
      try {
        const statusRes = await api.getWorkspaceStatus(wsId);
        if (statusRes?.stats) {
          setStats(statusRes.stats);
          if (statusRes.stats.total_documents !== undefined || statusRes.stats.knowledge_items !== undefined) {
            setCurrentWorkspace((prev) => {
              if (!prev) return prev;
              const newD = statusRes.stats.total_documents ?? prev.d_count;
              const newK = statusRes.stats.knowledge_items ?? prev.k_count;
              if (prev.d_count === newD && prev.k_count === newK) return prev;
              return {
                ...prev,
                d_count: newD,
                k_count: newK
              };
            });
          }
        }
      } catch {
        // silent fallback
      }
    } catch (err) {
      console.error('Error refreshing workspace data:', err);
    } finally {
      setRefreshing(false);
    }
  }, [currentWorkspace?.id, activeTab]);

  useEffect(() => {
    refreshData();
  }, [refreshData]);

  // Live auto-polling: Polls active workspace data every 5 seconds so CLI actions
  // (dw add, dw commit, dw push) reflect instantly without manual browser refresh
  useEffect(() => {
    if (!currentWorkspace?.id) return;
    const interval = setInterval(() => {
      refreshData();
    }, 5000);
    return () => clearInterval(interval);
  }, [currentWorkspace?.id, refreshData]);

  // Live auto-polling on WorkspaceHub: Polls workspaces list every 8 seconds
  // so document/fact counters update in real time as CLI commands run
  useEffect(() => {
    if (currentWorkspace?.id) return;
    const interval = setInterval(async () => {
      try {
        const wsList = await api.getWorkspaces();
        if (Array.isArray(wsList)) setWorkspaces(wsList);
      } catch {}
    }, 8000);
    return () => clearInterval(interval);
  }, [currentWorkspace?.id]);

  useEffect(() => {
    if (authUser) {
      setCurrentUser(authUser);
    } else {
      const u = api.getCurrentUser();
      if (u) setCurrentUser(u);
    }
  }, [authUser]);

  // Actions
  const handleCreateWorkspace = async (name, desc, template = 'empty', visibility = 'private') => {
    const cleanName = (name || '').trim();
    if (!cleanName) {
      showToast('Workspace name cannot be empty', 'error');
      return;
    }
    const isDuplicate = (workspaces || []).some(
      (w) => w.name && w.name.trim().toLowerCase() === cleanName.toLowerCase()
    );
    if (isDuplicate) {
      showToast(`A workspace named "${cleanName}" already exists. Please choose a unique name.`, 'error');
      return;
    }
    try {
      const newWs = await api.createWorkspace(cleanName, desc, template, visibility);
      const wsItem = {
        ...newWs,
        name: newWs.name || cleanName,
        description: newWs.description || desc,
        template: newWs.template || template,
        visibility: newWs.visibility || visibility,
        d_count: 0,
        k_count: 0
      };
      setWorkspaces((prev) => [wsItem, ...prev]);
      setCurrentWorkspace(wsItem);
      showToast(`Workspace "${cleanName}" created successfully!`);
      // Direct immediately into the newly created workspace
      navigate(`/workspaces/${wsItem.id}/diff`);
      return wsItem;
    } catch (err) {
      showToast(`Create failed: ${err.message}`, 'error');
      throw err;
    }
  };

  const handleDeleteWorkspace = async (wsId) => {
    try {
      // Optimistically remove from state
      setWorkspaces((prev) => prev.filter((w) => w.id !== wsId));
      if (currentWorkspace?.id === wsId) {
        setCurrentWorkspace(null);
        navigate('/');
      }
      showToast('Workspace deleted successfully.', 'info');
      await api.deleteWorkspace(wsId);
      refreshData();
    } catch (err) {
      showToast(`Delete failed: ${err.message}`, 'error');
      refreshData();
    }
  };

  const handleBatchDeleteWorkspaces = async (wsIds = [], deleteAll = false) => {
    try {
      if (deleteAll) {
        setWorkspaces([]);
        setCurrentWorkspace(null);
        navigate('/');
        showToast('All workspaces deleted.', 'info');
      } else {
        const idSet = new Set(wsIds);
        setWorkspaces((prev) => prev.filter((w) => !idSet.has(w.id)));
        if (currentWorkspace && idSet.has(currentWorkspace.id)) {
          setCurrentWorkspace(null);
          navigate('/');
        }
        showToast(`${wsIds.length} workspace(s) deleted.`, 'info');
      }
      await api.batchDeleteWorkspaces(wsIds, deleteAll);
      refreshData();
    } catch (err) {
      showToast(`Batch delete failed: ${err.message}`, 'error');
      refreshData();
    }
  };

  const handleSelectWorkspace = (ws) => {
    if (!ws) {
      setCurrentWorkspace(null);
      navigate('/');
      return;
    }
    setCurrentWorkspace(ws);
    const targetTab = ((ws.d_count === 0 && ws.k_count === 0) || ws.is_new) ? 'quickstart' : 'diff';
    navigate(`/workspaces/${ws.id}/${targetTab}`);
  };

  const handleTabChange = (tabId) => {
    setActiveTab(tabId);
    if (currentWorkspace?.id) {
      navigate(`/workspaces/${currentWorkspace.id}/${tabId}`);
    }
  };

  const handleReview = async (proposalId, decision, comments = '') => {
    // 1. Identify proposal details for rich feedback
    const targetProp = (proposals || []).find((p) => p.id === proposalId || p.proposal_id === proposalId);
    const factSnippet = targetProp?.summary ||
      targetProp?.proposed_changes?.value ||
      targetProp?.proposed_changes?.proposed?.value ||
      (targetProp?.id ? `PR #${targetProp.id.slice(0, 8)}` : 'Knowledge proposal');

    // 2. Optimistic Update on proposals array
    setProposals((prev) =>
      prev.map((p) => {
        if (p.id === proposalId || p.proposal_id === proposalId) {
          return { ...p, status: decision, reviewed_at: new Date().toISOString() };
        }
        return p;
      })
    );

    // 3. Optimistic Update on diff object (filter out approved/rejected deltas)
    setDiff((prev) => {
      if (!prev) return prev;
      const keep = (item) => item.proposal_id !== proposalId && item.id !== proposalId;
      return {
        ...prev,
        additions: (prev.additions || []).filter(keep),
        changes: (prev.changes || []).filter(keep),
        conflicts: (prev.conflicts || []).filter(keep),
        removals: (prev.removals || []).filter(keep),
      };
    });

    // 4. Optimistic Update on stats
    setStats((prev) => {
      if (!prev) return prev;
      const pending = Math.max(0, (prev.pending_proposals ?? 1) - 1);
      const kCount = decision === 'APPROVED' ? (prev.knowledge_items ?? 0) + 1 : (prev.knowledge_items ?? 0);
      return {
        ...prev,
        pending_proposals: pending,
        knowledge_items: kCount,
      };
    });

    // 5. Rich Toast feedback
    const actionLabel = decision === 'APPROVED' ? 'Approved & Merged' : decision === 'REJECTED' ? 'Rejected' : 'Archived';
    const preview = factSnippet.length > 50 ? `${factSnippet.slice(0, 50)}...` : factSnippet;
    showToast(`${actionLabel}: "${preview}"`, decision === 'REJECTED' ? 'info' : 'success');

    // 6. Network call (sub-10ms direct DB update via FastAPI)
    try {
      await api.reviewProposal(currentWorkspace?.id, proposalId, decision, comments);
      refreshData();
    } catch (err) {
      showToast(`Review failed: ${err.message}`, 'error');
      refreshData();
    }
  };

  const handleBatchReview = async (decision) => {
    const pendingList = (proposals || []).filter((p) => !p.status || p.status === 'PENDING');
    const count = pendingList.length || (stats?.pending_proposals ?? 0);

    // Optimistic Update
    setProposals((prev) => prev.map((p) => (!p.status || p.status === 'PENDING' ? { ...p, status: decision } : p)));
    setDiff({ additions: [], changes: [], conflicts: [], removals: [] });
    setStats((prev) => {
      if (!prev) return prev;
      return {
        ...prev,
        pending_proposals: 0,
        knowledge_items: decision === 'APPROVED' ? (prev.knowledge_items ?? 0) + count : (prev.knowledge_items ?? 0),
      };
    });

    showToast(`Batch ${decision.toLowerCase()} applied to ${count} pending items!`, 'success');

    try {
      const res = await api.batchReview(currentWorkspace.id, decision);
      refreshData();
    } catch (err) {
      showToast(`Batch review failed: ${err.message}`, 'error');
      refreshData();
    }
  };

  const handleUpload = async (file) => {
    try {
      const res = await api.uploadDocument(currentWorkspace.id, file);
      showToast(`Document ${file.name} staged!`);
      // Update local workspace count
      setCurrentWorkspace((prev) => prev ? { ...prev, d_count: (prev.d_count || 0) + 1 } : prev);
      refreshData();
      return res;
    } catch (err) {
      showToast(`Upload failed: ${err.message}`, 'error');
      throw err;
    }
  };

  const handleUploadBatch = async (files, batchName) => {
    try {
      const res = await api.uploadBatchDocuments(currentWorkspace.id, files, batchName);
      showToast(`Batch "${res.batch?.name || 'Batch'}" staged (${files.length} docs)!`);
      setCurrentWorkspace((prev) => prev ? { ...prev, d_count: (prev.d_count || 0) + files.length } : prev);
      refreshData();
      return res;
    } catch (err) {
      showToast(`Batch upload failed: ${err.message}`, 'error');
      throw err;
    }
  };


  const handleCreateRule = async (name, operator, condition, isBlocking) => {
    try {
      await api.createRule(currentWorkspace.id, name, operator, condition, isBlocking);
      showToast(`Policy rule "${name}" created.`);
      refreshData();
    } catch (err) {
      showToast(`Rule creation failed: ${err.message}`, 'error');
    }
  };

  const handleDeleteRule = async (ruleId) => {
    try {
      await api.deleteRule(ruleId);
      showToast('Rule deleted.');
      refreshData();
    } catch (err) {
      showToast(`Rule deletion failed: ${err.message}`, 'error');
    }
  };

  const handleValidate = async () => {
    try {
      const valRes = await api.validateProposals(currentWorkspace.id);
      showToast(valRes.has_violations ? 'Policy violations detected!' : 'All CI policy checks passed!');
      return valRes;
    } catch (err) {
      showToast(`Validation check failed: ${err.message}`, 'error');
      throw err;
    }
  };

  const handleLogout = () => {
    api.logout();
    authLogout();
    navigate('/login', { replace: true });
  };

  // Determine if workspace is completely empty (0 docs and 0 facts, and user hasn't explicitly dismissed the quickstart)
  const isWorkspaceEmpty = currentWorkspace && 
    (currentWorkspace.d_count === 0 && currentWorkspace.k_count === 0) &&
    dismissedEmptyStateFor !== currentWorkspace.id;

  return (
    <div className="min-h-screen bg-[#080B11] text-slate-100 flex flex-col font-sans transition-colors duration-200">
      {/* Three-tier GitHub/Vercel style Navbar */}
      <Navbar
        workspaces={workspaces}
        currentWorkspace={currentWorkspace}
        onSelectWorkspace={handleSelectWorkspace}
        onCreateWorkspace={handleCreateWorkspace}
        activeTab={activeTab}
        onSelectTab={handleTabChange}
        stats={stats}
        currentUser={currentUser}
        onLogout={handleLogout}
        onRefresh={() => refreshData()}
        refreshing={refreshing}
        proposals={proposals}
        diff={diff}
        onOpenAccessModal={() => setShowAccessModal(true)}
        onOpenGlobalSearch={() => setShowGlobalSearch(true)}
        onOpenUserProfile={(target) => setSelectedProfileUser(target || currentUser?.id)}
        showToast={showToast}
      />

      {/* Main Content Area */}
      <main className="flex-1 w-full">
        {/* =================================================================== */}
        {/* VIEW 0: Public User Profile & Workspace Activity                    */}
        {/* =================================================================== */}
        {(selectedProfileUser || isProfilePage) ? (
          <UserProfileView
            userIdOrUsername={selectedProfileUser || profileUserId || currentUser?.id}
            onClose={() => {
              setSelectedProfileUser(null);
              if (isProfilePage) navigate('/');
            }}
            onSelectWorkspace={(ws) => {
              setSelectedProfileUser(null);
              handleSelectWorkspace(ws);
            }}
            currentUser={currentUser}
          />
        ) : (
          <>
            {/* VIEW 1: Dedicated Create Workspace Page (/new or /workspaces/new)  */}
            {isNewWorkspacePage && (
              <CreateWorkspacePage
                onCreateWorkspace={handleCreateWorkspace}
                workspaces={workspaces}
                currentUser={currentUser}
              />
            )}

            {/* VIEW 2: Workspaces Hub (When no ws is selected and not creating)   */}
            {!isNewWorkspacePage && !currentWorkspace && (
              <WorkspaceHub
                workspaces={workspaces}
                currentWorkspace={currentWorkspace}
                onSelectWorkspace={handleSelectWorkspace}
                onCreateWorkspace={handleCreateWorkspace}
                onDeleteWorkspace={handleDeleteWorkspace}
                onBatchDeleteWorkspaces={handleBatchDeleteWorkspaces}
                currentUser={currentUser}
              />
            )}
          </>
        )}

        {/* =================================================================== */}
        {/* VIEW 2: Inside a Workspace                                         */}
        {/* =================================================================== */}
        {currentWorkspace && (
          <div className="max-w-7xl w-full mx-auto px-4 sm:px-6 lg:px-8 py-6 space-y-6">
            {/* Workspace Context Bar */}
            <div className="flex items-center justify-between text-xs text-slate-400">
              <div className="flex items-center space-x-2">
                <Link
                  to="/"
                  onClick={() => setCurrentWorkspace(null)}
                  className="hover:text-emerald-400 transition flex items-center space-x-1 font-semibold"
                >
                  <ArrowLeft className="w-3.5 h-3.5" />
                  <span>Workspaces</span>
                </Link>
                <span className="text-slate-600">/</span>
                <span className="font-semibold text-white flex items-center space-x-1">
                  <GitBranch className="w-3.5 h-3.5 text-emerald-400" />
                  <span>Knowledge Branch:</span>
                </span>
                <span className="px-2 py-0.5 rounded bg-emerald-500/10 text-emerald-400 font-mono border border-emerald-500/20 font-bold">
                  main
                </span>
                <span className="text-slate-600">&bull;</span>
                <span className="text-slate-400 font-mono text-[11px] truncate max-w-[200px] sm:max-w-none">
                  Workspace: {currentWorkspace.id}
                </span>
              </div>

              <div className="flex items-center space-x-2">
                <Link
                  to={`/workspaces/${currentWorkspace.id}/staging`}
                  onClick={() => setActiveTab('staging')}
                  className="px-2.5 py-1 rounded-md bg-[#238636] hover:bg-[#2EA043] text-white font-semibold text-xs transition block no-underline"
                >
                  + Stage Document
                </Link>
                <button
                  onClick={() => refreshData()}
                  className="flex items-center space-x-1 px-2.5 py-1 rounded-md bg-[#161B22] hover:bg-[#21262D] border border-[#30363D] text-slate-300 hover:text-white transition"
                >
                  <RefreshCw className={`w-3.5 h-3.5 ${refreshing ? 'animate-spin text-emerald-400' : ''}`} />
                  <span>Sync</span>
                </button>
              </div>
            </div>

            {/* Show GitHub-style CLI quickstart only when quickstart tab is selected */}
            {activeTab === 'quickstart' ? (
              <WorkspaceEmptyState
                workspace={currentWorkspace}
                currentUser={currentUser}
                onUploadDocument={handleUpload}
                onRefresh={refreshData}
                onDismissEmptyState={() => {
                  setDismissedEmptyStateFor(currentWorkspace.id);
                  handleTabChange('diff');
                }}
              />
            ) : (
              <>
                {/* TAB 1: Semantic Diff Viewer (Default!) */}
                {activeTab === 'diff' && (
                  <SemanticDiffViewer
                    diffData={diff}
                    onReviewProposal={handleReview}
                    onBatchReview={handleBatchReview}
                    loading={loading}
                  />
                )}

                {/* TAB 2: Pull Requests Deck */}
                {activeTab === 'prs' && (
                  <PRReviewDeck
                    proposals={proposals}
                    onReviewProposal={handleReview}
                    onBatchReview={handleBatchReview}
                    loading={loading}
                    workspaceId={currentWorkspace.id}
                    selectedProposalId={urlProposalId}
                  />
                )}

                {/* TAB 3: Knowledge Graph DAG Canvas */}
                {activeTab === 'graph' && (
                  <KnowledgeGraph graphData={graphData} loading={loading} onSelectTab={handleTabChange} />
                )}

                {/* TAB 4: Documents & Ingestion Staging */}
                {activeTab === 'staging' && (
                  <IngestionStaging
                    documents={documents}
                    onUploadDocument={handleUpload}
                    onUploadBatch={handleUploadBatch}
                    currentWorkspace={currentWorkspace}
                    currentUser={authUser}
                    loading={loading}
                    onSelectTab={handleTabChange}
                    onRefresh={refreshData}
                  />
                )}

                {/* TAB 5: Policy Rules CI Lab */}
                {activeTab === 'rules' && (
                  <PolicyRulesLab
                    rules={rules}
                    currentWorkspace={currentWorkspace}
                    onCreateRule={handleCreateRule}
                    onDeleteRule={handleDeleteRule}
                    onValidate={handleValidate}
                    loading={loading}
                  />
                )}

                {/* TAB 6: Master Truth Register */}
                {activeTab === 'knowledge' && (
                  <KnowledgeBase
                    knowledgeItems={knowledgeItems}
                    currentWorkspace={currentWorkspace}
                    loading={loading}
                    searchQuery={searchQuery}
                    onSearchChange={setSearchQuery}
                    setActiveTab={handleTabChange}
                    pendingProposalsCount={(proposals || []).filter((p) => !p.status || p.status.toUpperCase() === 'PENDING').length}
                    onApproveAll={() => handleBatchReview('APPROVED')}
                    onRefresh={refreshData}
                  />
                )}

                {/* TAB 7: Audit Timeline Log */}
                {activeTab === 'audit' && (
                  <AuditLog activityFeed={activity} loading={loading} />
                )}

              </>
            )}
          </div>
        )}
      </main>

      {/* Floating Toast Notification */}
      {toast && (
        <div className="fixed bottom-6 right-6 z-50 animate-bounce">
          <div
            className={`px-4 py-2.5 rounded-xl border shadow-2xl flex items-center space-x-2 text-xs font-medium backdrop-blur-md ${
              toast.type === 'error'
                ? 'bg-rose-950/90 border-rose-500/50 text-rose-200'
                : 'bg-emerald-950/90 border-emerald-500/50 text-emerald-200'
            }`}
          >
            {toast.type === 'error' ? (
              <AlertCircle className="w-4 h-4 text-rose-400" />
            ) : (
              <CheckCircle2 className="w-4 h-4 text-emerald-400" />
            )}
            <span>{toast.message}</span>
          </div>
        </div>
      )}

      {/* Workspace Access & Collaborators Modal */}
      {showAccessModal && currentWorkspace && (
        <AccessManagementModal
          workspace={currentWorkspace}
          isOpen={showAccessModal}
          onClose={() => setShowAccessModal(false)}
          onWorkspaceUpdated={(updatedWs) => {
            setCurrentWorkspace(updatedWs);
            setWorkspaces((prev) => prev.map((w) => w.id === updatedWs.id ? updatedWs : w));
          }}
        />
      )}

      {/* Global Search Modal (Ctrl+K) */}
      <GlobalSearchModal
        isOpen={showGlobalSearch}
        onClose={() => setShowGlobalSearch(false)}
        onSelectWorkspace={handleSelectWorkspace}
        onSelectUser={(u) => setSelectedProfileUser(u.id || u.username)}
      />
    </div>
  );
}