import { useState, useEffect } from 'react';
import { useRouter } from 'next/router';
import Layout from '../components/Layout';
import PermissionIndicator from '../components/PermissionIndicator';
import { useAuth } from '../lib/use-auth';
import Link from 'next/link';
import { VOCAB, collectionDisplayName } from '../lib/collection-vocabulary.js';

export default function Dashboard() {
  const router = useRouter();
  const { user, loading: authLoading } = useAuth();
  
  const [collections, setCollections] = useState([]);
  const [loading, setLoading] = useState(true);

  // Redirect to login if not authenticated
  useEffect(() => {
    if (!authLoading && !user) {
      router.push('/login');
    }
  }, [authLoading, user, router]);

  const fetchCollections = async () => {
    try {
      const token = localStorage.getItem('auth_token');
      const headers = {
        'Content-Type': 'application/json',
      };
      
      if (token) {
        headers.Authorization = `Bearer ${token}`;
      }
      
      const response = await fetch('/api/collections', { headers });
      
      if (response.ok) {
        const data = await response.json();
        
        // Fetch thumbnails for each collection
        const collectionsWithThumbnails = await Promise.all(
          data.map(async (collection) => {
            try {
              const identifier = collection.slug || collection.id;
              const thumbnailResponse = await fetch(`/api/collections/${identifier}/thumbnails`, { headers });
              if (thumbnailResponse.ok) {
                const thumbnailData = await thumbnailResponse.json();
                return { ...collection, thumbnails: thumbnailData.thumbnails };
              }
              return { ...collection, thumbnails: [] };
            } catch (error) {
              console.error(`Error fetching thumbnails for collection ${collection.id}:`, error);
              return { ...collection, thumbnails: [] };
            }
          })
        );
        
        setCollections(collectionsWithThumbnails);
      } else {
        console.error('Failed to fetch collections');
        setCollections([]);
      }
    } catch (error) {
      console.error('Error fetching collections:', error);
      setCollections([]);
    } finally {
      setLoading(false);
    }
  }

  useEffect(() => {
    if (user) {
      // eslint-disable-next-line react-hooks/set-state-in-effect -- load dashboard lists when user is available
      fetchCollections();
    }
  }, [user]);

;

  return (
    <Layout user={user}>
      {/* Header */}
      <div className="p-4 sm:p-6" style={{ backgroundColor: 'var(--bg-secondary)', borderBottom: '1px solid var(--border)' }}>
        <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4">
          <div>
            <h1 className="text-2xl sm:text-3xl font-bold mb-2" style={{ color: 'var(--text-primary)' }}>
              {VOCAB.MY_COLLECTION}
            </h1>
            <p className="text-base sm:text-lg" style={{ color: 'var(--text-secondary)' }}>
              Overview of your lists and owned cards
            </p>
          </div>
          <div className="flex space-x-2 sm:space-x-4">
            <Link href="/collections">
              <button className="px-4 py-2 text-sm font-medium rounded-xl transition-all duration-200 hover:opacity-90" style={{ backgroundColor: 'var(--accent-ember)', color: 'white' }}>
                <div className="flex items-center space-x-2">
                  <svg className="h-4 w-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 6v6m0 0v6m0-6h6m-6 0H6" />
                  </svg>
                  <span>Create List</span>
                </div>
              </button>
            </Link>
          </div>
        </div>
      </div>

      {/* Content */}
      <div className="p-4 sm:p-6">
        {loading ? (
          <div className="flex items-center justify-center py-20">
            <div className="animate-spin rounded-full h-12 w-12 border-b-2" style={{ borderColor: 'var(--accent-ember)' }}></div>
          </div>
        ) : (
          <div className="max-w-7xl mx-auto">
            {/* Stats Cards */}
            <div className="grid grid-cols-1 md:grid-cols-3 gap-6 mb-8">
              <div className="rounded-2xl p-6" style={{ backgroundColor: 'var(--bg-secondary)' }}>
                <div className="flex items-center">
                  <div className="p-3 rounded-2xl mr-4" style={{ backgroundColor: 'var(--accent-ember)' }}>
                    <svg className="h-8 w-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 11H5m14 0a2 2 0 012 2v6a2 2 0 01-2 2H5a2 2 0 01-2-2v-6a2 2 0 012-2m14 0V9a2 2 0 00-2-2M5 9a2 2 0 012-2m0 0V5a2 2 0 012-2h6a2 2 0 012 2v2M7 7h10" />
                    </svg>
                  </div>
                  <div>
                    <p className="text-2xl font-bold" style={{ color: 'var(--text-primary)' }}>{collections.length}</p>
                    <p className="text-sm" style={{ color: 'var(--text-secondary)' }}>Lists</p>
                  </div>
                </div>
              </div>

              <div className="rounded-2xl p-6" style={{ backgroundColor: 'var(--bg-secondary)' }}>
                <div className="flex items-center">
                  <div className="p-3 rounded-2xl mr-4" style={{ backgroundColor: 'var(--accent-gold)' }}>
                    <svg className="h-8 w-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 10h18M7 15h1m4 0h1m-7 4h12a3 3 0 003-3V8a3 3 0 00-3-3H6a3 3 0 00-3 3v8a3 3 0 003 3z" />
                    </svg>
                  </div>
                  <div>
                    <p className="text-2xl font-bold" style={{ color: 'var(--text-primary)' }}>
                      {collections.reduce((total, col) => total + (col.cardCount || 0), 0)}
                    </p>
                    <p className="text-sm" style={{ color: 'var(--text-secondary)' }}>Total Cards</p>
                  </div>
                </div>
              </div>

              <div className="rounded-2xl p-6" style={{ backgroundColor: 'var(--bg-secondary)' }}>
                <div className="flex items-center">
                  <div className="p-3 rounded-2xl mr-4" style={{ backgroundColor: 'var(--accent-flame)' }}>
                    <svg className="h-8 w-8 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 8c-1.657 0-3 .895-3 2s1.343 2 3 2 3 .895 3 2-1.343 2-3 2m0-8c1.11 0 2.08.402 2.599 1M12 8V7m0 1v8m0 0v1m0-1c-1.11 0-2.08-.402-2.599-1" />
                    </svg>
                  </div>
                  <div>
                    <p className="text-2xl font-bold" style={{ color: 'var(--text-primary)' }}>
                      ${collections.reduce((total, col) => total + (col.value || 0), 0).toLocaleString()}
                    </p>
                    <p className="text-sm" style={{ color: 'var(--text-secondary)' }}>Total Value</p>
                  </div>
                </div>
              </div>
            </div>

            {/* Collections Grid */}
            <div className="mb-6">
              <h2 className="text-xl font-bold mb-4" style={{ color: 'var(--text-primary)' }}>Recent Lists</h2>
              {collections.length === 0 ? (
                <div className="text-center py-12">
                  <div className="w-16 h-16 mx-auto mb-4 rounded-2xl flex items-center justify-center" style={{ backgroundColor: 'var(--bg-secondary)' }}>
                    <svg className="w-8 h-8" fill="none" stroke="currentColor" viewBox="0 0 24 24" style={{ color: 'var(--text-secondary)' }}>
                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 11H5m14 0a2 2 0 012 2v6a2 2 0 01-2 2H5a2 2 0 01-2-2v-6a2 2 0 012-2m14 0V9a2 2 0 00-2-2M5 9a2 2 0 012-2m0 0V5a2 2 0 012-2h6a2 2 0 012 2v2M7 7h10" />
                    </svg>
                  </div>
                  <h3 className="text-lg font-semibold mb-2" style={{ color: 'var(--text-primary)' }}>No Lists Yet</h3>
                  <p className="mb-4" style={{ color: 'var(--text-secondary)' }}>
                    Create your first list to start organizing your cards
                  </p>
                  <Link href="/collections">
                    <button className="px-6 py-3 font-medium rounded-xl transition-all duration-200 hover:opacity-90" style={{ backgroundColor: 'var(--accent-ember)', color: 'white' }}>
                      Create Your First List
                    </button>
                  </Link>
                </div>
              ) : (
                <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
                  {collections.slice(0, 6).map((collection) => (
                    <Link key={collection.id} href={`/collection/${collection.slug || collection.id}`}>
                      <div className="rounded-2xl p-6 transition-all duration-200 hover:scale-105 cursor-pointer" style={{ backgroundColor: 'var(--bg-secondary)' }}>
                        <div className="flex items-center mb-4">
                          <div className="w-12 h-12 rounded-xl mr-4 flex items-center justify-center gradient-bg-ember">
                            <span className="text-white font-bold">
                              {collection.name?.charAt(0)?.toUpperCase() || 'C'}
                            </span>
                          </div>
                          <div className="flex-1 min-w-0">
                            <h3 className="font-semibold truncate" style={{ color: 'var(--text-primary)' }}>
                              {collectionDisplayName(collection)}
                            </h3>
                            <p className="text-sm truncate" style={{ color: 'var(--text-secondary)' }}>
                              {collection.cardCount || 0} cards
                            </p>
                          </div>
                        </div>
                        {collection.description && (
                          <p className="text-sm mb-3 line-clamp-2" style={{ color: 'var(--text-secondary)' }}>
                            {collection.description}
                          </p>
                        )}
                        <div className="flex items-center justify-between">
                          <span className="text-sm font-medium" style={{ color: 'var(--text-primary)' }}>
                            ${(collection.value || 0).toLocaleString()}
                          </span>
                          <PermissionIndicator isPublic={collection.isPublic} />
                        </div>
                      </div>
                    </Link>
                  ))}
                </div>
              )}
            </div>

            {collections.length > 6 && (
              <div className="text-center">
                <Link href="/collections">
                  <button className="px-6 py-3 font-medium rounded-xl border-2 transition-all duration-200 hover:opacity-80" style={{ color: 'var(--text-primary)', borderColor: 'var(--accent-ember)' }}>
                    View All Lists
                  </button>
                </Link>
              </div>
            )}
          </div>
        )}
      </div>
    </Layout>
  );
}