feat: add dark/light mode toggle with localStorage persistence

- Enable Tailwind "class" dark mode strategy - Use CSS custom properties for theme colors (bg, text, border) - Add ThemeProvider context with toggle and localStorage persistence - Add Sun/Moon toggle button in the header navigation - Inline script in index.html prevents FOUC on page load - All pages (Layout, Login, Register, ProtectedRoute) support both modes - Default theme follows system preference (prefers-color-scheme) Closes leeworks-agents/SPARC#33 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-26 10:15:11 +00:00
12 changed files with 109 additions and 100 deletions
@@ -9,7 +9,7 @@ from typing import Annotated, List
 from fastapi import BackgroundTasks, Depends, FastAPI, HTTPException, Query, Request
 from fastapi.middleware.cors import CORSMiddleware
-from fastapi.responses import JSONResponse, StreamingResponse
+from fastapi.responses import JSONResponse
 from pydantic import BaseModel, EmailStr, Field
 from slowapi import Limiter
 from slowapi.errors import RateLimitExceeded
@@ -389,61 +389,6 @@ async def get_analytics(
    )
 # ============== Export Endpoints ==============
@app.get("/export/{company_name}", tags=["Export"])
 async def export_company_csv(
    company_name: str,
    _: UserResponse = Depends(get_current_user),
 ):
    """Export analysis results for a company as a CSV file.
    Returns all stored analysis records for the given company, including
    analysis type, model used, response text, and timestamp.
    Args:
        company_name: Company name to export results for
    Returns:
        CSV file download
    """
    import csv
    import io
    db = get_db_client()
    # Query all non-cached analysis results for this company
    with db.get_conn() as conn:
        with conn.cursor() as cur:
            cur.execute(
                """
                SELECT company_name, analysis_type, model, response, timestamp
                FROM llm_messages
                WHERE LOWER(company_name) = LOWER(%s) AND is_cached = FALSE
                ORDER BY timestamp DESC
                """,
                (company_name,),
            )
            rows = cur.fetchall()
    if not rows:
        raise HTTPException(status_code=404, detail=f"No analysis results found for '{company_name}'")
    output = io.StringIO()
    writer = csv.writer(output)
    writer.writerow(["company_name", "analysis_type", "model", "analysis", "timestamp"])
    for row in rows:
        writer.writerow(row)
    output.seek(0)
    safe_name = company_name.replace(" ", "_").lower()
    return StreamingResponse(
        iter([output.getvalue()]),
        media_type="text/csv",
        headers={"Content-Disposition": f'attachment; filename="sparc_{safe_name}_export.csv"'},
    )
 # ============== System Endpoints ==============
@@ -7,6 +7,15 @@
    <title>SPARC Dashboard</title>
  </head>
  <body>
    <script>
      // Prevent FOUC: apply saved theme before first render
      (function() {
        var theme = localStorage.getItem('theme');
        if (theme === 'dark' || (!theme && window.matchMedia('(prefers-color-scheme: dark)').matches)) {
          document.documentElement.classList.add('dark');
        }
      })();
    </script>
    <div id="root"></div>
    <script type="module" src="/src/main.tsx"></script>
  </body>
@@ -1,6 +1,7 @@
 import { BrowserRouter, Routes, Route, Navigate } from 'react-router-dom';
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
 import { AuthProvider } from './context/AuthContext';
 import { ThemeProvider } from './context/ThemeContext';
 import { Layout } from './components/Layout';
 import { ProtectedRoute } from './components/ProtectedRoute';
 import { Login } from './pages/Login';
@@ -22,6 +23,7 @@ const queryClient = new QueryClient({
 function App() {
  return (
    <ThemeProvider>
    <QueryClientProvider client={queryClient}>
      <AuthProvider>
        <BrowserRouter>
@@ -61,6 +63,7 @@ function App() {
        </BrowserRouter>
      </AuthProvider>
    </QueryClientProvider>
    </ThemeProvider>
  );
 }
@@ -126,23 +126,6 @@ export const analysisApi = {
  },
 };
 // Export API
 export const exportApi = {
  exportCsv: async (companyName: string): Promise<void> => {
    const response = await api.get(`/export/${encodeURIComponent(companyName)}`, {
      responseType: 'blob',
    });
    const url = window.URL.createObjectURL(new Blob([response.data]));
    const link = document.createElement('a');
    link.href = url;
    link.setAttribute('download', `sparc_${companyName.toLowerCase().replace(/\s+/g, '_')}_export.csv`);
    document.body.appendChild(link);
    link.click();
    link.remove();
    window.URL.revokeObjectURL(url);
  },
 };
 // Analytics API
 export const analyticsApi = {
  getAnalytics: async (days = 30): Promise<Analytics> => {
@@ -1,9 +1,11 @@
 import { Outlet, NavLink, useNavigate } from 'react-router-dom';
 import { useAuth } from '../context/AuthContext';
-import { Search, Layers, BarChart3, Info, Users, LogOut } from 'lucide-react';
+import { useTheme } from '../context/ThemeContext';
 import { Search, Layers, BarChart3, Info, Users, LogOut, Sun, Moon } from 'lucide-react';
 export function Layout() {
  const { user, isAdmin, logout } = useAuth();
  const { theme, toggleTheme } = useTheme();
  const navigate = useNavigate();
  const handleLogout = () => {
@@ -23,7 +25,7 @@ export function Layout() {
  }
  return (
-    <div className="min-h-screen bg-gradient-to-br from-bg-dark to-indigo-950">
+    <div className="min-h-screen bg-gradient-to-br from-bg-dark to-slate-100 dark:to-indigo-950">
      {/* Header */}
      <header className="bg-bg-card/80 backdrop-blur-lg border-b border-primary/20">
        <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
@@ -63,6 +65,13 @@ export function Layout() {
            {/* User menu */}
            <div className="flex items-center gap-4">
              <button
                onClick={toggleTheme}
                className="p-2 rounded-lg text-text-secondary hover:text-text-primary hover:bg-bg-card-hover transition-all"
                aria-label={theme === 'dark' ? 'Switch to light mode' : 'Switch to dark mode'}
              >
                {theme === 'dark' ? <Sun size={18} /> : <Moon size={18} />}
              </button>
              <div className="text-right hidden sm:block">
                <div className="text-sm font-medium text-text-primary">{user?.email}</div>
                <div className="text-xs text-text-secondary capitalize">{user?.role}</div>
@@ -12,7 +12,7 @@ export function ProtectedRoute({ children, requireAdmin = false }: ProtectedRout
  if (isLoading) {
    return (
-      <div className="min-h-screen bg-gradient-to-br from-bg-dark to-indigo-950 flex items-center justify-center">
+      <div className="min-h-screen bg-gradient-to-br from-bg-dark to-slate-100 dark:to-indigo-950 flex items-center justify-center">
        <div className="animate-spin rounded-full h-12 w-12 border-t-2 border-b-2 border-primary"></div>
      </div>
    );
@@ -0,0 +1,48 @@
 import { createContext, useContext, useEffect, useState } from 'react';
 type Theme = 'light' | 'dark';
 interface ThemeContextType {
  theme: Theme;
  toggleTheme: () => void;
 }
 const ThemeContext = createContext<ThemeContextType | undefined>(undefined);
 function getInitialTheme(): Theme {
  const stored = localStorage.getItem('theme');
  if (stored === 'light' || stored === 'dark') return stored;
  return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
 }
 export function ThemeProvider({ children }: { children: React.ReactNode }) {
  const [theme, setTheme] = useState<Theme>(getInitialTheme);
  useEffect(() => {
    const root = document.documentElement;
    if (theme === 'dark') {
      root.classList.add('dark');
    } else {
      root.classList.remove('dark');
    }
    localStorage.setItem('theme', theme);
  }, [theme]);
  const toggleTheme = () => {
    setTheme((prev) => (prev === 'dark' ? 'light' : 'dark'));
  };
  return (
    <ThemeContext.Provider value={{ theme, toggleTheme }}>
      {children}
    </ThemeContext.Provider>
  );
 }
 export function useTheme() {
  const context = useContext(ThemeContext);
  if (!context) {
    throw new Error('useTheme must be used within a ThemeProvider');
  }
  return context;
 }
@@ -2,6 +2,26 @@
@tailwind components;
@tailwind utilities;
 /* Light mode (default) */
 :root {
  --color-bg-dark: #f1f5f9;
  --color-bg-card: #ffffff;
  --color-bg-card-hover: #e2e8f0;
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-border: #cbd5e1;
 }
 /* Dark mode */
 .dark {
  --color-bg-dark: #0f172a;
  --color-bg-card: #1e293b;
  --color-bg-card-hover: #334155;
  --color-text-primary: #f8fafc;
  --color-text-secondary: #94a3b8;
  --color-border: #334155;
 }
 body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
@@ -15,7 +35,7 @@ body {
 }
 ::-webkit-scrollbar-track {
-  background: #1e293b;
+  background: var(--color-bg-card);
 }
 ::-webkit-scrollbar-thumb {
@@ -30,5 +50,5 @@ body {
 /* Selection */
 ::selection {
  background: rgba(99, 102, 241, 0.3);
-  color: #f8fafc;
+  color: var(--color-text-primary);
 }
@@ -1,7 +1,7 @@
 import { useState } from 'react';
 import { useMutation } from '@tanstack/react-query';
-import { analysisApi, exportApi } from '../api/client';
+import { analysisApi } from '../api/client';
-import { Search, CheckCircle, AlertCircle, Clock, FileText, Download } from 'lucide-react';
+import { Search, CheckCircle, AlertCircle, Clock, FileText } from 'lucide-react';
 import type { CompanyAnalysis } from '../types';
 export function Analysis() {
@@ -106,18 +106,9 @@ export function Analysis() {
          {/* Analysis Content */}
          {result.success && result.analysis && (
            <div className="bg-bg-card/60 backdrop-blur-lg border border-primary/15 rounded-2xl p-6">
-              <div className="flex items-center justify-between border-b-2 border-primary/30 pb-2 mb-4">
+              <h3 className="text-lg font-semibold text-text-primary border-b-2 border-primary/30 pb-2 mb-4">
-                <h3 className="text-lg font-semibold text-text-primary">
+                AI Analysis Results
-                  AI Analysis Results
+              </h3>
                </h3>
                <button
                  onClick={() => exportApi.exportCsv(result.company_name)}
                  className="flex items-center gap-2 text-sm bg-primary/20 hover:bg-primary/30 text-primary font-medium px-3 py-1.5 rounded-lg transition-colors"
                >
                  <Download size={14} />
                  Export CSV
                </button>
              </div>
              <div className="prose prose-invert max-w-none">
                <div className="text-text-primary whitespace-pre-wrap leading-relaxed">
                  {result.analysis}
@@ -31,7 +31,7 @@ export function Login() {
  };
  return (
-    <div className="min-h-screen bg-gradient-to-br from-bg-dark to-indigo-950 flex items-center justify-center px-4">
+    <div className="min-h-screen bg-gradient-to-br from-bg-dark to-slate-100 dark:to-indigo-950 flex items-center justify-center px-4">
      <div className="w-full max-w-md">
        {/* Brand */}
        <div className="text-center mb-8">
@@ -40,7 +40,7 @@ export function Register() {
  };
  return (
-    <div className="min-h-screen bg-gradient-to-br from-bg-dark to-indigo-950 flex items-center justify-center px-4">
+    <div className="min-h-screen bg-gradient-to-br from-bg-dark to-slate-100 dark:to-indigo-950 flex items-center justify-center px-4">
      <div className="w-full max-w-md">
        {/* Brand */}
        <div className="text-center mb-8">
@@ -4,6 +4,7 @@ export default {
    "./index.html",
    "./src/**/*.{js,ts,jsx,tsx}",
  ],
  darkMode: 'class',
  theme: {
    extend: {
      colors: {
@@ -16,15 +17,15 @@ export default {
        warning: '#f59e0b',
        error: '#ef4444',
        bg: {
-          dark: '#0f172a',
+          dark: 'var(--color-bg-dark)',
-          card: '#1e293b',
+          card: 'var(--color-bg-card)',
-          'card-hover': '#334155',
+          'card-hover': 'var(--color-bg-card-hover)',
        },
        text: {
-          primary: '#f8fafc',
+          primary: 'var(--color-text-primary)',
-          secondary: '#94a3b8',
+          secondary: 'var(--color-text-secondary)',
        },
-        border: '#334155',
+        border: 'var(--color-border)',
      },
    },
  },