frontend/src/App.tsx

import { useState, Suspense, lazy } from 'react';
import { Target } from 'lucide-react';
import type { JobConfig, Extras } from './types';
import { JobRunnerProvider, useJobRunner } from './hooks/JobRunnerProvider';

const DatasetConfigPage = lazy(() => import('./pages/DatasetConfigPage'));
const ModelConfigPage   = lazy(() => import('./pages/ModelConfigPage'));
const ResultsPage       = lazy(() => import('./pages/ResultsPage'));

type Tab = 'dataset' | 'model' | 'results';

function AppInner() {
  const [tab, setTab] = useState<Tab>('dataset');
  const { start } = useJobRunner();

  const run = (cfg: JobConfig, extras: Extras) => {
    start(cfg, extras);
    setTab('results');
  };

  const tabBtn = (active: boolean) =>
    `relative px-4 py-2 rounded-xl text-sm font-medium transition-all ${
      active
        ? 'text-white bg-gradient-to-r from-indigo-600 via-violet-600 to-fuchsia-600 shadow-lg shadow-indigo-600/20'
        : 'text-slate-600 hover:text-slate-800 bg-white/70 backdrop-blur border border-white/30 hover:shadow-md'
    }`;

  return (
    <div className="min-h-screen bg-[radial-gradient(1200px_800px_at_20%_-10%,#c7d2fe_0%,transparent_60%),radial-gradient(1200px_800px_at_120%_20%,#fbcfe8_0%,transparent_55%)] bg-slate-50">
      <header className="sticky top-0 z-50">
        <div className="backdrop-blur-xl bg-white/60 border-b border-white/40 shadow-[0_10px_30px_-12px_rgba(30,41,59,0.25)] supports-[backdrop-filter]:bg-white/40">
          <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 h-16 flex items-center justify-between">
            <div className="flex items-center gap-3">
              <div className="p-2 rounded-xl bg-gradient-to-br from-indigo-600 to-fuchsia-600 shadow-md shadow-indigo-600/30">
                <Target className="w-6 h-6 text-white" />
              </div>
              <div>
                <h1 className="text-lg sm:text-xl font-bold tracking-tight text-slate-900">AlignMint</h1>
                <p className="text-xs text-slate-600">Freshly minted data for your target metrics</p>
              </div>
            </div>

            <div className="hidden sm:flex items-center gap-2">
              <span className="px-3 py-1 rounded-full text-xs font-medium bg-emerald-50 text-emerald-700 border border-emerald-200">System Health</span>
              <span className="px-3 py-1 rounded-full text-xs font-medium bg-slate-100 text-slate-700 border border-slate-200">v1.0.0</span>
            </div>
          </div>
        </div>

        <div className="border-b border-white/40 bg-white/30 backdrop-blur supports-[backdrop-filter]:bg-white/20">
          <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-3 flex gap-3">
            <button className={tabBtn(tab==='dataset')} onClick={() => setTab('dataset')}>
              Dataset Config
            </button>
            <button className={tabBtn(tab==='model')} onClick={() => setTab('model')}>
              Model Config
            </button>
            <button className={tabBtn(tab==='results')} onClick={() => setTab('results')}>
              Results
            </button>
          </div>
        </div>
      </header>

      <main className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
        <Suspense fallback={
          <div className="p-8 rounded-2xl border border-white/30 bg-white/60 backdrop-blur text-slate-600">
            Loading
          </div>
        }>
          {/* Dataset -> Model -> Results 流程：dataset 填完再進 model，model 送出後執行並進 results */}
          {tab === 'dataset' && <DatasetConfigPage onNext={() => setTab('model')} />}
          {tab === 'model'   && <ModelConfigPage onRun={run} />}
          {tab === 'results' && <ResultsPage />}
        </Suspense>
      </main>
    </div>
  );
}

export default function App() {
  return (
    <JobRunnerProvider>
      <AppInner />
    </JobRunnerProvider>
  );
}