import { useState, useEffect, useRef } from 'react';
import { useParams, Link } from 'react-router-dom';
import { Graft } from '../types';
import { listGrafts, cultivate, getDownloadUrl } from '../api';
import './Home.css';
import './TreePage.css';

function TreePage() {
  const { groveName, treeName } = useParams<{ groveName: string; treeName: string }>();
  const [grafts, setGrafts] = useState<Graft[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [uploading, setUploading] = useState(false);
  const [uploadResult, setUploadResult] = useState<string | null>(null);
  const [tag, setTag] = useState('');
  const fileInputRef = useRef<HTMLInputElement>(null);

  useEffect(() => {
    if (groveName && treeName) {
      loadGrafts();
    }
  }, [groveName, treeName]);

  async function loadGrafts() {
    try {
      setLoading(true);
      const data = await listGrafts(groveName!, treeName!);
      setGrafts(data);
      setError(null);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to load grafts');
    } finally {
      setLoading(false);
    }
  }

  async function handleUpload(e: React.FormEvent) {
    e.preventDefault();
    const file = fileInputRef.current?.files?.[0];
    if (!file) {
      setError('Please select a file');
      return;
    }

    try {
      setUploading(true);
      setError(null);
      const result = await cultivate(groveName!, treeName!, file, tag || undefined);
      setUploadResult(`Uploaded successfully! Fruit ID: ${result.fruit_id}`);
      setTag('');
      if (fileInputRef.current) {
        fileInputRef.current.value = '';
      }
      loadGrafts();
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Upload failed');
    } finally {
      setUploading(false);
    }
  }

  if (loading) {
    return <div className="loading">Loading...</div>;
  }

  return (
    <div className="home">
      <nav className="breadcrumb">
        <Link to="/">Groves</Link> / <Link to={`/grove/${groveName}`}>{groveName}</Link> / <span>{treeName}</span>
      </nav>

      <div className="page-header">
        <h1>📦 {treeName}</h1>
      </div>

      {error && <div className="error-message">{error}</div>}
      {uploadResult && <div className="success-message">{uploadResult}</div>}

      <div className="upload-section card">
        <h3>Upload Artifact</h3>
        <form onSubmit={handleUpload} className="upload-form">
          <div className="form-group">
            <label htmlFor="file">File</label>
            <input
              id="file"
              type="file"
              ref={fileInputRef}
              required
            />
          </div>
          <div className="form-group">
            <label htmlFor="tag">Tag (optional)</label>
            <input
              id="tag"
              type="text"
              value={tag}
              onChange={(e) => setTag(e.target.value)}
              placeholder="v1.0.0, latest, stable..."
            />
          </div>
          <button type="submit" className="btn btn-primary" disabled={uploading}>
            {uploading ? 'Uploading...' : 'Upload'}
          </button>
        </form>
      </div>

      <h2>Tags / Versions</h2>
      {grafts.length === 0 ? (
        <div className="empty-state">
          <p>No tags yet. Upload an artifact with a tag to create one!</p>
        </div>
      ) : (
        <div className="grafts-table">
          <table>
            <thead>
              <tr>
                <th>Tag</th>
                <th>Fruit ID</th>
                <th>Created</th>
                <th>Actions</th>
              </tr>
            </thead>
            <tbody>
              {grafts.map((graft) => (
                <tr key={graft.id}>
                  <td><strong>{graft.name}</strong></td>
                  <td className="fruit-id">{graft.fruit_id.substring(0, 12)}...</td>
                  <td>{new Date(graft.created_at).toLocaleString()}</td>
                  <td>
                    <a
                      href={getDownloadUrl(groveName!, treeName!, graft.name)}
                      className="btn btn-secondary btn-small"
                      download
                    >
                      Download
                    </a>
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      )}

      <div className="usage-section card">
        <h3>Usage</h3>
        <p>Download artifacts using:</p>
        <pre>
          <code>curl -O {window.location.origin}/api/v1/grove/{groveName}/{treeName}/+/latest</code>
        </pre>
        <p>Or with a specific tag:</p>
        <pre>
          <code>curl -O {window.location.origin}/api/v1/grove/{groveName}/{treeName}/+/v1.0.0</code>
        </pre>
      </div>
    </div>
  );
}

export default TreePage;