import { dateLocaleCode } from '@/lib/dateFnsI18n';
import { useState } from 'react';
import { Link } from 'react-router-dom';
import { useSeoMeta } from '@unhead/react';
import { Card, CardContent, CardHeader } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Textarea } from '@/components/ui/textarea';
import { Skeleton } from '@/components/ui/skeleton';
import { Badge } from '@/components/ui/badge';
import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogDescription } from '@/components/ui/dialog';
import { AlertDialog, AlertDialogAction, AlertDialogCancel, AlertDialogContent, AlertDialogDescription, AlertDialogFooter, AlertDialogHeader, AlertDialogTitle } from '@/components/ui/alert-dialog';
import { useToast } from '@/hooks/useToast';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { useMySpotCollections, useCreateSpotCollection, useDeleteSpotCollection, useUpdateSpotCollection } from '@/hooks/useSpotCollections';
import type { SpotCollection } from '@/lib/types';
import { FolderPlus, FolderOpen, MapPin, Plus, Loader2, Pencil, Trash2, Calendar, ArrowRight, Bookmark } from 'lucide-react';
import { useTranslation } from '@/contexts/language';
import { cn } from '@/lib/utils';

function CollectionCard({
  collection,
  onEdit,
  onDelete,
}: {
  collection: SpotCollection;
  onEdit: (collection: SpotCollection) => void;
  onDelete: (collection: SpotCollection) => void;
}) {
  const { t } = useTranslation();
  return (
    <Link to={`/collections/${collection.pubkey}/${collection.identifier}`}>
      <Card className={cn(
        "group overflow-hidden hover:shadow-2xl transition-all duration-300 border-2 bg-black/90 backdrop-blur active:scale-[0.98]",
        "border-[#ccff00]/30 hover:border-[#ccff00]/70 hover:shadow-[#ccff00]/20"
      )}>
        {/* Image/Header */}
        <div className="relative aspect-video overflow-hidden bg-gradient-to-br from-[#ccff00]/20 to-[#00ff88]/20">
          {collection.image ? (
            <img
              src={collection.image}
              alt={collection.title}
              className="w-full h-full object-cover transition-transform duration-500 group-hover:scale-110"
            />
          ) : (
            <div className="w-full h-full flex items-center justify-center">
              <FolderOpen className="h-12 w-12 sm:h-16 sm:w-16 text-[#ccff00]/40" />
            </div>
          )}
          {/* Spot count badge */}
          <div className="absolute top-2 left-2 sm:top-3 sm:left-3">
            <Badge className="bg-black/80 text-[#ccff00] backdrop-blur-sm border border-[#ccff00]/50 font-bold text-xs">
              <MapPin className="h-2.5 w-2.5 sm:h-3 sm:w-3 mr-1" />
              {collection.spotRefs.length === 1
                ? t('mapUi.spotSingular')
                : t('mapUi.spotPlural', { count: collection.spotRefs.length })}
            </Badge>
          </div>
          {/* Action buttons - always visible on mobile, hover on desktop */}
          <div className="absolute top-2 right-2 sm:top-3 sm:right-3 flex gap-1 opacity-100 sm:opacity-0 sm:group-hover:opacity-100 transition-opacity">
            <Button
              size="icon"
              variant="ghost"
              className="h-8 w-8 sm:h-8 sm:w-8 bg-black/80 hover:bg-black text-white touch-manipulation"
              onClick={(e) => {
                e.preventDefault();
                e.stopPropagation();
                onEdit(collection);
              }}
            >
              <Pencil className="h-4 w-4" />
            </Button>
            <Button
              size="icon"
              variant="ghost"
              className="h-8 w-8 sm:h-8 sm:w-8 bg-black/80 hover:bg-red-500/80 text-white touch-manipulation"
              onClick={(e) => {
                e.preventDefault();
                e.stopPropagation();
                onDelete(collection);
              }}
            >
              <Trash2 className="h-4 w-4" />
            </Button>
          </div>
        </div>

        <CardHeader className="p-3 sm:p-4 pb-1 sm:pb-2">
          <h3 className="font-bold text-sm sm:text-lg leading-tight transition-colors line-clamp-1 uppercase tracking-wide text-white group-hover:text-[#ccff00]">
            {collection.title}
          </h3>
          {collection.description && (
            <p className="text-xs sm:text-sm text-gray-400 line-clamp-2">
              {collection.description}
            </p>
          )}
        </CardHeader>

        <CardContent className="p-3 sm:p-4 pt-0 sm:pt-0 pb-3 sm:pb-4">
          <div className="flex items-center justify-between text-[10px] sm:text-xs text-gray-500">
            <span className="flex items-center gap-1">
              <Calendar className="h-2.5 w-2.5 sm:h-3 sm:w-3" />
              {new Date(collection.createdAt * 1000).toLocaleDateString(dateLocaleCode())}
            </span>
            <span className="flex items-center gap-1 text-[#ccff00] sm:opacity-0 sm:group-hover:opacity-100 transition-opacity">
              {t('mapUi.view')}
              <ArrowRight className="h-2.5 w-2.5 sm:h-3 sm:w-3" />
            </span>
          </div>
        </CardContent>
      </Card>
    </Link>
  );
}

function CollectionCardSkeleton() {
  return (
    <Card className="overflow-hidden border-2 border-gray-800">
      <Skeleton className="aspect-video w-full" />
      <CardHeader className="pb-2">
        <Skeleton className="h-6 w-3/4" />
        <Skeleton className="h-4 w-full" />
      </CardHeader>
      <CardContent className="pb-4">
        <Skeleton className="h-4 w-1/3" />
      </CardContent>
    </Card>
  );
}

export default function SpotCollectionsPage() {
  const { t } = useTranslation();
  const { user } = useCurrentUser();
  const { data: collections, isLoading } = useMySpotCollections();
  const { createCollection, isPending: isCreating } = useCreateSpotCollection();
  const { deleteCollection, isPending: isDeleting } = useDeleteSpotCollection();
  const { updateCollection, isPending: isUpdating } = useUpdateSpotCollection();
  const { toast } = useToast();

  const [showCreateDialog, setShowCreateDialog] = useState(false);
  const [showEditDialog, setShowEditDialog] = useState(false);
  const [showDeleteDialog, setShowDeleteDialog] = useState(false);
  const [selectedCollection, setSelectedCollection] = useState<SpotCollection | null>(null);

  const [newTitle, setNewTitle] = useState('');
  const [newDescription, setNewDescription] = useState('');
  const [editTitle, setEditTitle] = useState('');
  const [editDescription, setEditDescription] = useState('');

  useSeoMeta({
    title: t('seoUi.spotCollectionsTitle'),
    description: t('seoUi.spotCollectionsDesc'),
  });

  const handleCreate = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!newTitle.trim()) return;

    try {
      await createCollection({
        title: newTitle.trim(),
        description: newDescription.trim() || undefined,
      });
      toast({
        title: t('mapUi.collectionCreated'),
        description: t('mapUi.collectionCreatedDesc', { title: newTitle }),
      });
      setNewTitle('');
      setNewDescription('');
      setShowCreateDialog(false);
    } catch (error) {
      toast({
        title: t('mapUi.collectionCreateFailed'),
        description: error instanceof Error ? error.message : t('mapUi.somethingWentWrong'),
        variant: 'destructive',
      });
    }
  };

  const handleEdit = (collection: SpotCollection) => {
    setSelectedCollection(collection);
    setEditTitle(collection.title);
    setEditDescription(collection.description || '');
    setShowEditDialog(true);
  };

  const handleEditSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!selectedCollection || !editTitle.trim()) return;

    try {
      await updateCollection({
        collection: selectedCollection,
        title: editTitle.trim(),
        description: editDescription.trim() || undefined,
      });
      toast({
        title: t('mapUi.collectionUpdated'),
        description: t('mapUi.changesSaved'),
      });
      setShowEditDialog(false);
      setSelectedCollection(null);
    } catch (error) {
      toast({
        title: t('mapUi.collectionUpdateFailed'),
        description: error instanceof Error ? error.message : t('mapUi.somethingWentWrong'),
        variant: 'destructive',
      });
    }
  };

  const handleDelete = (collection: SpotCollection) => {
    setSelectedCollection(collection);
    setShowDeleteDialog(true);
  };

  const handleDeleteConfirm = async () => {
    if (!selectedCollection) return;

    try {
      await deleteCollection(selectedCollection);
      toast({
        title: t('mapUi.collectionDeleted'),
        description: t('mapUi.collectionDeletedDesc', { title: selectedCollection.title }),
      });
      setShowDeleteDialog(false);
      setSelectedCollection(null);
    } catch (error) {
      toast({
        title: t('mapUi.collectionDeleteFailed'),
        description: error instanceof Error ? error.message : t('mapUi.somethingWentWrong'),
        variant: 'destructive',
      });
    }
  };

  return (
    <>
      <div className="container px-4 py-4 sm:py-8">
        {/* Header */}
        <div className="flex flex-col sm:flex-row sm:items-center justify-between gap-4 mb-6 sm:mb-8">
          <div className="min-w-0">
            <h1 className="text-xl sm:text-3xl font-black uppercase tracking-wider flex items-center gap-2 sm:gap-3">
              <Bookmark className="h-6 w-6 sm:h-8 sm:w-8 text-[#ccff00] flex-shrink-0" />
              <span className="neon-text truncate">{t('mapUi.myCollections')}</span>
            </h1>
            <p className="text-gray-400 mt-1 sm:mt-2 text-sm sm:text-base">
              {t('mapUi.collectionsSubtitle')}
            </p>
          </div>
          {user && (
            <Button
              onClick={() => setShowCreateDialog(true)}
              className="bg-[#ccff00] text-black hover:bg-[#ccff00]/90 font-bold uppercase gap-2 h-11 sm:h-auto w-full sm:w-auto flex-shrink-0"
            >
              <Plus className="h-4 w-4" />
              {t('mapUi.newCollection')}
            </Button>
          )}
        </div>

        {/* Not logged in state */}
        {!user && (
          <Card className="border-dashed border-2 border-gray-700">
            <CardContent className="py-16 text-center">
              <FolderPlus className="h-16 w-16 mx-auto mb-4 text-gray-600" />
              <h2 className="text-xl font-bold mb-2">{t('mapUi.loginToCreate')}</h2>
              <p className="text-gray-400 mb-6">
                {t('mapUi.loginToCreateDesc')}
              </p>
            </CardContent>
          </Card>
        )}

        {/* Loading state */}
        {user && isLoading && (
          <div className="grid gap-4 sm:gap-6 grid-cols-2 lg:grid-cols-3">
            {Array.from({ length: 6 }).map((_, i) => (
              <CollectionCardSkeleton key={i} />
            ))}
          </div>
        )}

        {/* Empty state */}
        {user && !isLoading && collections?.length === 0 && (
          <Card className="border-dashed border-2 border-gray-700">
            <CardContent className="py-16 text-center">
              <FolderOpen className="h-16 w-16 mx-auto mb-4 text-[#ccff00]/40" />
              <h2 className="text-xl font-bold mb-2">{t('mapUi.noCollections')}</h2>
              <p className="text-gray-400 mb-6">
                {t('mapUi.noCollectionsDesc')}
              </p>
              <Button
                onClick={() => setShowCreateDialog(true)}
                className="bg-[#ccff00] text-black hover:bg-[#ccff00]/90 font-bold uppercase gap-2"
              >
                <Plus className="h-4 w-4" />
                {t('mapUi.createFirstCollection')}
              </Button>
            </CardContent>
          </Card>
        )}

        {/* Collections grid */}
        {user && !isLoading && collections && collections.length > 0 && (
          <div className="grid gap-4 sm:gap-6 grid-cols-2 lg:grid-cols-3">
            {collections.map((collection) => (
              <CollectionCard
                key={collection.id}
                collection={collection}
                onEdit={handleEdit}
                onDelete={handleDelete}
              />
            ))}
          </div>
        )}
      </div>

      {/* Create Collection Dialog */}
      <Dialog open={showCreateDialog} onOpenChange={setShowCreateDialog}>
        <DialogContent className="bg-black border-2 border-[#ccff00]/50 mx-4 max-w-[calc(100vw-2rem)] sm:max-w-lg">
          <DialogHeader>
            <DialogTitle className="flex items-center gap-2 text-white">
              <FolderPlus className="h-5 w-5 text-[#ccff00]" />
              {t('mapUi.createNewCollection')}
            </DialogTitle>
            <DialogDescription className="text-gray-400 text-sm">
              {t('mapUi.createCollectionDesc')}
            </DialogDescription>
          </DialogHeader>
          <form onSubmit={handleCreate} className="space-y-4 mt-4">
            <div className="space-y-2">
              <Label htmlFor="create-title" className="text-white text-sm">{t('mapUi.collectionName')}</Label>
              <Input
                id="create-title"
                value={newTitle}
                onChange={(e) => setNewTitle(e.target.value)}
                placeholder={t('mapUi.collectionNamePlaceholder')}
                className="bg-black border-gray-700 text-white h-11"
                autoFocus
              />
            </div>
            <div className="space-y-2">
              <Label htmlFor="create-description" className="text-white text-sm">{t('mapUi.descriptionOptional')}</Label>
              <Textarea
                id="create-description"
                value={newDescription}
                onChange={(e) => setNewDescription(e.target.value)}
                placeholder={t('mapUi.descriptionPlaceholder')}
                className="bg-black border-gray-700 text-white resize-none"
                rows={3}
              />
            </div>
            <div className="flex gap-2 pt-2">
              <Button
                type="button"
                variant="outline"
                onClick={() => setShowCreateDialog(false)}
                className="flex-1 border-gray-700 h-11"
              >
                {t('common.cancel')}
              </Button>
              <Button
                type="submit"
                disabled={!newTitle.trim() || isCreating}
                className="flex-1 bg-[#ccff00] text-black hover:bg-[#ccff00]/90 font-bold h-11"
              >
                {isCreating ? (
                  <>
                    <Loader2 className="h-4 w-4 mr-2 animate-spin" />
                    {t('mapUi.creating')}
                  </>
                ) : (
                  <>
                    <Plus className="h-4 w-4 mr-2" />
                    <span className="hidden sm:inline">{t('mapUi.createCollection')}</span>
                    <span className="sm:hidden">{t('common.create')}</span>
                  </>
                )}
              </Button>
            </div>
          </form>
        </DialogContent>
      </Dialog>

      {/* Edit Collection Dialog */}
      <Dialog open={showEditDialog} onOpenChange={setShowEditDialog}>
        <DialogContent className="bg-black border-2 border-[#ccff00]/50 mx-4 max-w-[calc(100vw-2rem)] sm:max-w-lg">
          <DialogHeader>
            <DialogTitle className="flex items-center gap-2 text-white">
              <Pencil className="h-5 w-5 text-[#ccff00]" />
              {t('mapUi.editCollection')}
            </DialogTitle>
          </DialogHeader>
          <form onSubmit={handleEditSubmit} className="space-y-4 mt-4">
            <div className="space-y-2">
              <Label htmlFor="edit-title" className="text-white text-sm">{t('mapUi.collectionName')}</Label>
              <Input
                id="edit-title"
                value={editTitle}
                onChange={(e) => setEditTitle(e.target.value)}
                className="bg-black border-gray-700 text-white h-11"
              />
            </div>
            <div className="space-y-2">
              <Label htmlFor="edit-description" className="text-white text-sm">{t('mapUi.descriptionOptional')}</Label>
              <Textarea
                id="edit-description"
                value={editDescription}
                onChange={(e) => setEditDescription(e.target.value)}
                className="bg-black border-gray-700 text-white resize-none"
                rows={3}
              />
            </div>
            <div className="flex gap-2 pt-2">
              <Button
                type="button"
                variant="outline"
                onClick={() => setShowEditDialog(false)}
                className="flex-1 border-gray-700 h-11"
              >
                {t('common.cancel')}
              </Button>
              <Button
                type="submit"
                disabled={!editTitle.trim() || isUpdating}
                className="flex-1 bg-[#ccff00] text-black hover:bg-[#ccff00]/90 font-bold h-11"
              >
                {isUpdating ? (
                  <>
                    <Loader2 className="h-4 w-4 mr-2 animate-spin" />
                    {t('mapUi.saving')}
                  </>
                ) : (
                  t('mapUi.saveChanges')
                )}
              </Button>
            </div>
          </form>
        </DialogContent>
      </Dialog>

      {/* Delete Confirmation Dialog */}
      <AlertDialog open={showDeleteDialog} onOpenChange={setShowDeleteDialog}>
        <AlertDialogContent className="bg-black border-2 border-red-500/50 mx-4 max-w-[calc(100vw-2rem)] sm:max-w-lg">
          <AlertDialogHeader>
            <AlertDialogTitle className="text-white">{t('mapUi.deleteCollectionTitle')}</AlertDialogTitle>
            <AlertDialogDescription className="text-gray-400 text-sm">
              {t('mapUi.deleteCollectionDesc', { title: selectedCollection?.title ?? '' })}
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter className="flex-col sm:flex-row gap-2 sm:gap-0">
            <AlertDialogCancel className="border-gray-700 h-11 sm:h-auto">{t('common.cancel')}</AlertDialogCancel>
            <AlertDialogAction
              onClick={handleDeleteConfirm}
              disabled={isDeleting}
              className="bg-red-500 hover:bg-red-600 text-white h-11 sm:h-auto"
            >
              {isDeleting ? (
                <>
                  <Loader2 className="h-4 w-4 mr-2 animate-spin" />
                  {t('mapUi.deleting')}
                </>
              ) : (
                t('common.delete')
              )}
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>
    </>
  );
}