import { useState } from 'react';
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog';
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 { useToast } from '@/hooks/useToast';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import {
  useMySpotCollections,
  useCreateSpotCollection,
  useAddSpotToCollection,
} from '@/hooks/useSpotCollections';
import { SKATE_SPOT_KIND, type SkateSpot, type SpotCollection } from '@/lib/types';
import { FolderPlus, Plus, Check, Loader2, FolderOpen, MapPin } from 'lucide-react';
import { cn } from '@/lib/utils';

interface AddToCollectionDialogProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  spot: SkateSpot;
}

export function AddToCollectionDialog({ open, onOpenChange, spot }: AddToCollectionDialogProps) {
  const { user } = useCurrentUser();
  const { data: collections, isLoading } = useMySpotCollections();
  const { createCollection, isPending: isCreating } = useCreateSpotCollection();
  const { addSpotToCollection, isPending: isAdding } = useAddSpotToCollection();
  const { toast } = useToast();

  const [showNewForm, setShowNewForm] = useState(false);
  const [newTitle, setNewTitle] = useState('');
  const [newDescription, setNewDescription] = useState('');
  const [addingToId, setAddingToId] = useState<string | null>(null);

  const spotRef = `${SKATE_SPOT_KIND}:${spot.pubkey}:${spot.identifier}`;

  const handleAddToCollection = async (collection: SpotCollection) => {
    if (collection.spotRefs.includes(spotRef)) {
      toast({
        title: 'Already saved',
        description: `"${spot.title}" is already in "${collection.title}"`,
      });
      return;
    }

    setAddingToId(collection.id);
    try {
      await addSpotToCollection({
        collection,
        spotPubkey: spot.pubkey,
        spotIdentifier: spot.identifier,
      });
      toast({
        title: 'Spot saved!',
        description: `Added "${spot.title}" to "${collection.title}"`,
      });
      onOpenChange(false);
    } catch (error) {
      toast({
        title: 'Failed to save',
        description: error instanceof Error ? error.message : 'Something went wrong',
        variant: 'destructive',
      });
    } finally {
      setAddingToId(null);
    }
  };

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

    try {
      await createCollection({
        title: newTitle.trim(),
        description: newDescription.trim() || undefined,
        spotRefs: [spotRef], // Add the current spot to the new collection
      });
      toast({
        title: 'Collection created!',
        description: `"${spot.title}" added to your new collection "${newTitle}"`,
      });
      setNewTitle('');
      setNewDescription('');
      setShowNewForm(false);
      onOpenChange(false);
    } catch (error) {
      toast({
        title: 'Failed to create collection',
        description: error instanceof Error ? error.message : 'Something went wrong',
        variant: 'destructive',
      });
    }
  };

  if (!user) {
    return (
      <Dialog open={open} onOpenChange={onOpenChange}>
        <DialogContent className="bg-black border-2 border-[#ff0040]/50">
          <DialogHeader>
            <DialogTitle className="flex items-center gap-2 text-white">
              <FolderPlus className="h-5 w-5 text-[#ccff00]" />
              Save to Collection
            </DialogTitle>
          </DialogHeader>
          <div className="py-8 text-center">
            <p className="text-gray-400">Please log in to save spots to collections</p>
          </div>
        </DialogContent>
      </Dialog>
    );
  }

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="bg-black border-2 border-[#ff0040]/50 mx-4 max-w-[calc(100vw-2rem)] sm:max-w-md">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2 text-white">
            <FolderPlus className="h-5 w-5 text-[#ccff00]" />
            Save to Collection
          </DialogTitle>
          <DialogDescription className="text-gray-400 text-sm">
            Save "{spot.title}" to one of your collections
          </DialogDescription>
        </DialogHeader>

        <div className="space-y-4 mt-4">
          {/* Existing Collections */}
          {isLoading ? (
            <div className="space-y-2">
              {Array.from({ length: 3 }).map((_, i) => (
                <Skeleton key={i} className="h-16 w-full" />
              ))}
            </div>
          ) : collections && collections.length > 0 ? (
            <div className="space-y-2 max-h-48 sm:max-h-64 overflow-y-auto pr-1 sm:pr-2 -mr-1 sm:-mr-2">
              {collections.map((collection) => {
                const isInCollection = collection.spotRefs.includes(spotRef);
                const isAddingThis = addingToId === collection.id;

                return (
                  <button
                    key={collection.id}
                    onClick={() => handleAddToCollection(collection)}
                    disabled={isAdding || isInCollection}
                    className={cn(
                      'w-full p-2.5 sm:p-3 rounded-lg border-2 transition-all text-left flex items-center gap-2.5 sm:gap-3 touch-manipulation active:scale-[0.98]',
                      isInCollection
                        ? 'border-[#ccff00]/50 bg-[#ccff00]/10 cursor-default'
                        : 'border-gray-700 hover:border-[#ccff00]/50 hover:bg-[#ccff00]/5'
                    )}
                  >
                    <div className={cn(
                      'w-9 h-9 sm:w-10 sm:h-10 rounded-lg flex items-center justify-center flex-shrink-0',
                      isInCollection ? 'bg-[#ccff00]/20' : 'bg-gray-800'
                    )}>
                      {isAddingThis ? (
                        <Loader2 className="h-4 w-4 sm:h-5 sm:w-5 animate-spin text-[#ccff00]" />
                      ) : isInCollection ? (
                        <Check className="h-4 w-4 sm:h-5 sm:w-5 text-[#ccff00]" />
                      ) : (
                        <FolderOpen className="h-4 w-4 sm:h-5 sm:w-5 text-gray-400" />
                      )}
                    </div>
                    <div className="flex-1 min-w-0">
                      <p className={cn(
                        'font-bold truncate text-sm sm:text-base',
                        isInCollection ? 'text-[#ccff00]' : 'text-white'
                      )}>
                        {collection.title}
                      </p>
                      <p className="text-[10px] sm:text-xs text-gray-500 flex items-center gap-1">
                        <MapPin className="h-2.5 w-2.5 sm:h-3 sm:w-3" />
                        {collection.spotRefs.length} spot{collection.spotRefs.length !== 1 ? 's' : ''}
                        {isInCollection && ' · Already saved'}
                      </p>
                    </div>
                  </button>
                );
              })}
            </div>
          ) : !showNewForm ? (
            <div className="text-center py-4 sm:py-6 text-gray-400">
              <FolderOpen className="h-10 w-10 sm:h-12 sm:w-12 mx-auto mb-2 sm:mb-3 opacity-50" />
              <p className="text-sm sm:text-base">You don't have any collections yet</p>
              <p className="text-xs sm:text-sm">Create your first one below!</p>
            </div>
          ) : null}

          {/* Create New Collection Form */}
          {showNewForm ? (
            <form onSubmit={handleCreateCollection} className="space-y-3 sm:space-y-4 pt-3 sm:pt-4 border-t border-gray-800">
              <div className="space-y-1.5 sm:space-y-2">
                <Label htmlFor="title" className="text-white text-sm">Collection Name</Label>
                <Input
                  id="title"
                  value={newTitle}
                  onChange={(e) => setNewTitle(e.target.value)}
                  placeholder="Barcelona Trip 2024"
                  className="bg-black border-gray-700 text-white h-11"
                  autoFocus
                />
              </div>
              <div className="space-y-1.5 sm:space-y-2">
                <Label htmlFor="description" className="text-white text-sm">Description (optional)</Label>
                <Textarea
                  id="description"
                  value={newDescription}
                  onChange={(e) => setNewDescription(e.target.value)}
                  placeholder="My favorite spots from my Barcelona trip..."
                  className="bg-black border-gray-700 text-white resize-none"
                  rows={2}
                />
              </div>
              <div className="flex gap-2">
                <Button
                  type="button"
                  variant="outline"
                  onClick={() => setShowNewForm(false)}
                  className="flex-1 border-gray-700 h-11"
                >
                  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" />
                      <span className="hidden sm:inline">Creating...</span>
                      <span className="sm:hidden">...</span>
                    </>
                  ) : (
                    <>
                      <Plus className="h-4 w-4 sm:mr-2" />
                      <span className="hidden sm:inline">Create & Save</span>
                      <span className="sm:hidden">Create</span>
                    </>
                  )}
                </Button>
              </div>
            </form>
          ) : (
            <Button
              onClick={() => setShowNewForm(true)}
              variant="outline"
              className="w-full border-dashed border-gray-600 hover:border-[#ccff00]/50 hover:bg-[#ccff00]/5 h-11"
            >
              <Plus className="h-4 w-4 mr-2" />
              Create New Collection
            </Button>
          )}
        </div>
      </DialogContent>
    </Dialog>
  );
}