'use client';

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

export default function ImportFilePage() {
  const router = useRouter();
  const [selectedMethod, setSelectedMethod] = useState<'file' | 'url' | null>('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) {
        const errorMessage = await parseErrorResponse(res);
        throw new Error(errorMessage);
      }

      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) {
        const errorMessage = await parseErrorResponse(res);
        throw new Error(errorMessage);
      }

      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 (
    <main style={{ padding: '1rem', maxWidth: '900px', margin: '0 auto' }}>
      <h1 style={{ marginBottom: '0.5rem' }}>Importera från fil eller länk</h1>
      <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>
      )}

      <div
        style={{
          display: 'grid',
          gridTemplateColumns: 'repeat(auto-fit, minmax(350px, 1fr))',
          gap: '1.5rem',
          marginBottom: '2rem',
        }}
      >
        <div
          onClick={() => setSelectedMethod('file')}
          style={{
            padding: '2rem',
            border: selectedMethod === 'file' ? '2px solid #0070f3' : '2px solid #e5e7eb',
            borderRadius: '8px',
            background: selectedMethod === 'file' ? '#f0f9ff' : '#f9fafb',
            cursor: 'pointer',
          }}
        >
          <h2 style={{ margin: '0 0 1rem 0', fontSize: '1.2rem', color: '#0070f3' }}>
            Ladda upp PDF eller bild
          </h2>
          <p style={{ color: '#666', margin: '0 0 1rem 0', fontSize: '0.95rem' }}>
            Stöd för PDF, PNG, JPG, JPEG, WEBP och BMP.
          </p>

          {selectedMethod === 'file' && (
            <form onSubmit={handleFileSubmit} style={{ display: 'grid', gap: '0.75rem' }}>
              <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>
          )}
        </div>

        <div
          onClick={() => setSelectedMethod('url')}
          style={{
            padding: '2rem',
            border: selectedMethod === 'url' ? '2px solid #10b981' : '2px solid #e5e7eb',
            borderRadius: '8px',
            background: selectedMethod === 'url' ? '#f0fdf4' : '#f9fafb',
            cursor: 'pointer',
          }}
        >
          <h2 style={{ margin: '0 0 1rem 0', fontSize: '1.2rem', color: '#10b981' }}>
            Länk till recept
          </h2>
          <p style={{ color: '#666', margin: '0 0 1rem 0', fontSize: '0.95rem' }}>
            Ange URL till exempelvis ICA eller en annan receptsida.
          </p>

          {selectedMethod === 'url' && (
            <form onSubmit={handleUrlSubmit} style={{ display: 'grid', gap: '0.75rem' }}>
              <input
                type="url"
                value={url}
                onChange={(e) => setUrl(e.target.value)}
                placeholder="https://exempel.se/recept/..."
                style={{
                  width: '100%',
                  padding: '0.75rem',
                  border: '1px solid #d1d5db',
                  borderRadius: '6px',
                  fontSize: '0.9rem',
                  boxSizing: 'border-box',
                }}
              />
              <button
                type="submit"
                disabled={!url.trim() || isLoading}
                style={{
                  width: '100%',
                  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,
                  fontSize: '0.95rem',
                }}
              >
                {isLoading ? 'Importerar...' : 'Importera från länk'}
              </button>
            </form>
          )}
        </div>
      </div>

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

      <div style={{ display: 'flex', gap: '1rem' }}>
        <Link
          href="/recipes/create"
          style={{
            padding: '0.75rem 1.5rem',
            background: 'transparent',
            border: '1px solid #ddd',
            borderRadius: '4px',
            textDecoration: 'none',
            color: '#333',
            fontWeight: 500,
          }}
        >
          Tillbaka
        </Link>
        <Link
          href="/recipes/write"
          style={{
            padding: '0.75rem 1.5rem',
            background: '#0070f3',
            color: 'white',
            borderRadius: '4px',
            textDecoration: 'none',
            fontWeight: 500,
          }}
        >
          Skriv in recept istället
        </Link>
      </div>
    </main>
  );
}