'use client';

import Link from 'next/link';
import { useRouter } from 'next/navigation';
import { useRef, useState, useEffect } from 'react';
import ReceiptImportClient from '../kvitto/ReceiptImportClient';
import { parseErrorResponse } from '../../lib/error-handler';

type Tab = 'kvitto' | 'recept';

type Product = { id: number; name: string; canonicalName: string | null };

export default function ImportTabsClient({ activeTab, isAdmin }: { activeTab: Tab; isAdmin: boolean }) {
  return (
    <main style={{ padding: '1rem', maxWidth: '900px', margin: '0 auto' }}>
      <h1 style={{ marginBottom: '1rem' }}>Importera</h1>

      {/* Flikar */}
      <div style={{ display: 'flex', gap: '0', marginBottom: '1.5rem', borderBottom: '2px solid #e5e7eb' }}>
        <Link
          href="/import?tab=kvitto"
          style={{
            padding: '0.6rem 1.25rem',
            fontWeight: 600,
            fontSize: '0.95rem',
            textDecoration: 'none',
            borderBottom: activeTab === 'kvitto' ? '2px solid #0070f3' : '2px solid transparent',
            marginBottom: '-2px',
            color: activeTab === 'kvitto' ? '#0070f3' : '#666',
            background: 'transparent',
          }}
        >
          🧾 Kvitto
        </Link>
        <Link
          href="/import?tab=recept"
          style={{
            padding: '0.6rem 1.25rem',
            fontWeight: 600,
            fontSize: '0.95rem',
            textDecoration: 'none',
            borderBottom: activeTab === 'recept' ? '2px solid #0070f3' : '2px solid transparent',
            marginBottom: '-2px',
            color: activeTab === 'recept' ? '#0070f3' : '#666',
            background: 'transparent',
          }}
        >
          📋 Recept
        </Link>
      </div>

      {/* Innehåll */}
      {activeTab === 'kvitto' && (
        <div>
          <p style={{ color: '#666', marginBottom: '1.5rem' }}>
            Fotografera eller ladda upp ett kvitto — varorna läggs till i ditt inventarie.
          </p>
          <ReceiptImportClient isAdmin={isAdmin} />
        </div>
      )}

      {activeTab === 'recept' && <ReceptImport />}
    </main>
  );
}

function ReceptImport() {
  const router = useRouter();
  const [selectedMethod, setSelectedMethod] = useState<'file' | 'url'>('file');
  const [selectedFile, setSelectedFile] = useState<File | null>(null);
  const [url, setUrl] = useState('');
  const [isLoading, setIsLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const handleFileSubmit = async (e: React.FormEvent<HTMLFormElement>) => {
    e.preventDefault();
    if (!selectedFile) { setError('Välj en PDF eller bildfil först.'); return; }
    setError(null);
    setIsLoading(true);
    try {
      const formData = new FormData();
      formData.append('file', selectedFile);
      const res = await fetch('/api/quick-import-proxy', { method: 'POST', body: formData });
      if (!res.ok) throw new Error(await parseErrorResponse(res));
      const data = await res.json();
      sessionStorage.setItem('prefilled_markdown', data.markdown ?? '');
      if (data.imageUrl) {
        sessionStorage.setItem('prefilled_image_url', data.imageUrl);
      } else {
        sessionStorage.removeItem('prefilled_image_url');
      }
      router.push('/recipes/write');
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Importen misslyckades.');
    } finally {
      setIsLoading(false);
    }
  };

  const handleUrlSubmit = async (e: React.FormEvent<HTMLFormElement>) => {
    e.preventDefault();
    if (!url.trim()) { setError('Vänligen ange en URL.'); return; }
    setError(null);
    setIsLoading(true);
    try {
      const res = await fetch('/api/quick-import-proxy', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ input: url.trim() }),
      });
      if (!res.ok) throw new Error(await parseErrorResponse(res));
      const data = await res.json();
      sessionStorage.setItem('prefilled_markdown', data.markdown ?? '');
      if (data.imageUrl) {
        sessionStorage.setItem('prefilled_image_url', data.imageUrl);
      } else {
        sessionStorage.removeItem('prefilled_image_url');
      }
      router.push('/recipes/write');
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Importen misslyckades.');
    } finally {
      setIsLoading(false);
    }
  };

  return (
    <div>
      <p style={{ color: '#666', marginBottom: '1.5rem' }}>
        Ladda upp en PDF eller bild för OCR, eller ange en receptlänk.
      </p>

      {error && (
        <div style={{ background: '#fef2f2', border: '1px solid #fca5a5', borderRadius: '6px', padding: '1rem', marginBottom: '1.5rem', color: '#dc2626', fontSize: '0.95rem' }}>
          {error}
        </div>
      )}

      {/* Välj metod */}
      <div style={{ display: 'flex', gap: '0.5rem', marginBottom: '1.5rem' }}>
        {(['file', 'url'] as const).map((m) => (
          <button
            key={m}
            onClick={() => setSelectedMethod(m)}
            style={{
              padding: '0.5rem 1rem',
              border: '1px solid',
              borderColor: selectedMethod === m ? '#0070f3' : '#d1d5db',
              borderRadius: '6px',
              background: selectedMethod === m ? '#eff6ff' : '#fff',
              color: selectedMethod === m ? '#0070f3' : '#555',
              fontWeight: selectedMethod === m ? 600 : 400,
              cursor: 'pointer',
              fontSize: '0.9rem',
            }}
          >
            {m === 'file' ? '📄 Fil / PDF' : '🔗 Länk'}
          </button>
        ))}
      </div>

      {selectedMethod === 'file' && (
        <form onSubmit={handleFileSubmit} style={{ display: 'grid', gap: '0.75rem', maxWidth: '500px' }}>
          <input
            type="file"
            accept=".pdf,.png,.jpg,.jpeg,.webp,.bmp"
            onChange={(e) => setSelectedFile(e.target.files?.[0] ?? null)}
            style={{ padding: '0.75rem', background: 'white', border: '1px solid #cbd5e1', borderRadius: '6px' }}
          />
          <button
            type="submit"
            disabled={!selectedFile || isLoading}
            style={{ padding: '0.75rem', background: '#0070f3', color: 'white', border: 'none', borderRadius: '4px', cursor: !selectedFile || isLoading ? 'not-allowed' : 'pointer', opacity: !selectedFile || isLoading ? 0.6 : 1, fontWeight: 600 }}
          >
            {isLoading ? 'Importerar...' : 'Importera fil'}
          </button>
        </form>
      )}

      {selectedMethod === 'url' && (
        <form onSubmit={handleUrlSubmit} style={{ display: 'grid', gap: '0.75rem', maxWidth: '500px' }}>
          <input
            type="url"
            value={url}
            onChange={(e) => setUrl(e.target.value)}
            placeholder="https://exempel.se/recept/..."
            style={{ padding: '0.75rem', border: '1px solid #d1d5db', borderRadius: '6px', fontSize: '0.9rem' }}
          />
          <button
            type="submit"
            disabled={!url.trim() || isLoading}
            style={{ padding: '0.75rem', background: '#10b981', color: 'white', border: 'none', borderRadius: '4px', cursor: !url.trim() || isLoading ? 'not-allowed' : 'pointer', opacity: !url.trim() || isLoading ? 0.6 : 1, fontWeight: 600 }}
          >
            {isLoading ? 'Importerar...' : 'Importera från länk'}
          </button>
        </form>
      )}

      <div style={{ background: '#f0fdf4', border: '1px solid #86efac', borderRadius: '6px', padding: '1rem', marginTop: '1.5rem', color: '#166534', fontSize: '0.9rem' }}>
        Efter import öppnas receptet automatiskt i redigeringsläget.
      </div>

      <div style={{ display: 'flex', gap: '1rem', marginTop: '1.5rem' }}>
        <Link href="/recipes/write" style={{ padding: '0.75rem 1.5rem', background: 'transparent', border: '1px solid #ddd', borderRadius: '4px', textDecoration: 'none', color: '#333', fontWeight: 500 }}>
          Skriv in recept istället
        </Link>
      </div>
    </div>
  );
}
