import { useQuery, useQueryClient } from '@tanstack/react-query';
import { SPOT_COLLECTION_KIND, SKATE_SPOT_KIND, parseSpotCollection, type SpotCollection } from '@/lib/types';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { useNostrPublish } from '@/hooks/useNostrPublish';
import { useSkateRelays } from '@/hooks/useSkateRelays';

/**
 * Preserve tags this app doesn't own. Kind 30003 is a NIP-51 bookmark set and
 * re-publishing an addressable event replaces the WHOLE tag set, so foreign
 * `e`/`r`/`p`/extra `t` (or `a` to a non-spot coordinate) from other clients
 * must be carried forward or they are silently erased.
 */
function foreignCollectionTags(collection: SpotCollection): string[][] {
  const out: string[][] = [];
  for (const tag of collection.event.tags) {
    const [n, v] = tag;
    if (n === 'd' || n === 'title' || n === 'description' || n === 'image' || n === 'alt') continue;
    if (n === 't' && v === 'skatespots') continue;
    if (n === 'a' && v?.startsWith(`${SKATE_SPOT_KIND}:`)) continue;
    out.push(tag);
  }
  return out;
}

/**
 * Fetch all spot collections for a specific user
 */
export function useSpotCollections(pubkey?: string) {
  const { querySkateContent, getQueryKeySuffix } = useSkateRelays();

  return useQuery({
    queryKey: ['spot-collections', pubkey, getQueryKeySuffix()],
    queryFn: async () => {
      if (!pubkey) return [];

      const signal = AbortSignal.timeout(10000);

      const events = await querySkateContent(
        [
          {
            kinds: [SPOT_COLLECTION_KIND],
            authors: [pubkey],
            '#t': ['skatespots'],
            limit: 50,
          },
        ],
        { signal }
      );

      const collections: SpotCollection[] = [];
      for (const event of events) {
        const collection = parseSpotCollection(event);
        if (collection) collections.push(collection);
      }

      return collections.sort((a, b) => b.createdAt - a.createdAt);
    },
    enabled: !!pubkey,
    staleTime: 30000,
    refetchOnMount: 'always',
  });
}

/**
 * Fetch the current user's spot collections
 */
export function useMySpotCollections() {
  const { user } = useCurrentUser();
  return useSpotCollections(user?.pubkey);
}

/**
 * Fetch a single spot collection by identifier
 */
export function useSpotCollection(identifier: string, pubkey?: string) {
  const { querySkateContent, getQueryKeySuffix } = useSkateRelays();

  return useQuery({
    queryKey: ['spot-collection', identifier, pubkey, getQueryKeySuffix()],
    queryFn: async () => {
      const signal = AbortSignal.timeout(10000);

      const filter: {
        kinds: number[];
        '#d': string[];
        '#t': string[];
        authors?: string[];
        limit: number;
      } = {
        kinds: [SPOT_COLLECTION_KIND],
        '#d': [identifier],
        '#t': ['skatespots'],
        limit: 1,
      };

      if (pubkey) {
        filter.authors = [pubkey];
      }

      const events = await querySkateContent([filter], { signal });

      if (events.length === 0) return null;

      return parseSpotCollection(events[0]);
    },
    enabled: !!identifier,
    staleTime: 30000,
    refetchOnMount: 'always',
  });
}

/**
 * Create a new spot collection
 */
export function useCreateSpotCollection() {
  const { mutateAsync: publishEvent, isPending } = useNostrPublish();
  const queryClient = useQueryClient();
  const { user } = useCurrentUser();

  const createCollection = async ({
    title,
    description,
    image,
    spotRefs = [],
  }: {
    title: string;
    description?: string;
    image?: string;
    spotRefs?: string[];
  }) => {
    if (!user) throw new Error('Must be logged in to create a collection');

    // Generate a unique identifier
    const identifier = `${title.toLowerCase().replace(/[^a-z0-9]+/g, '-')}-${Date.now()}`;

    const tags: string[][] = [
      ['d', identifier],
      ['title', title],
      ['t', 'skatespots'],
      ['alt', `Spot collection: ${title}`],
    ];

    if (description) {
      tags.push(['description', description]);
    }

    if (image) {
      tags.push(['image', image]);
    }

    // Add spot references
    for (const ref of spotRefs) {
      tags.push(['a', ref]);
    }

    const event = await publishEvent({
      kind: SPOT_COLLECTION_KIND,
      content: description || '',
      tags,
    });

    // Invalidate collections cache
    queryClient.invalidateQueries({ queryKey: ['spot-collections', user.pubkey] });

    return event;
  };

  return { createCollection, isPending };
}

/**
 * Add a spot to a collection
 */
export function useAddSpotToCollection() {
  const { mutateAsync: publishEvent, isPending } = useNostrPublish();
  const queryClient = useQueryClient();
  const { user } = useCurrentUser();

  const addSpotToCollection = async ({
    collection,
    spotPubkey,
    spotIdentifier,
  }: {
    collection: SpotCollection;
    spotPubkey: string;
    spotIdentifier: string;
  }) => {
    if (!user) throw new Error('Must be logged in to modify a collection');
    if (collection.pubkey !== user.pubkey) throw new Error('You can only modify your own collections');

    const spotRef = `${SKATE_SPOT_KIND}:${spotPubkey}:${spotIdentifier}`;

    // Check if already in collection
    if (collection.spotRefs.includes(spotRef)) {
      throw new Error('Spot already in collection');
    }

    // Build updated tags from original event
    const tags: string[][] = [
      ['d', collection.identifier],
      ['title', collection.title],
      ['t', 'skatespots'],
      ['alt', `Spot collection: ${collection.title}`],
    ];

    if (collection.description) {
      tags.push(['description', collection.description]);
    }

    if (collection.image) {
      tags.push(['image', collection.image]);
    }

    // Add existing spot refs
    for (const ref of collection.spotRefs) {
      tags.push(['a', ref]);
    }

    // Add new spot ref
    tags.push(['a', spotRef]);

    // Preserve foreign tags from the original event.
    tags.push(...foreignCollectionTags(collection));

    const event = await publishEvent({
      kind: SPOT_COLLECTION_KIND,
      content: collection.description || '',
      tags,
    });

    // Invalidate caches
    queryClient.invalidateQueries({ queryKey: ['spot-collections', user.pubkey] });
    queryClient.invalidateQueries({ queryKey: ['spot-collection', collection.identifier] });

    return event;
  };

  return { addSpotToCollection, isPending };
}

/**
 * Remove a spot from a collection
 */
export function useRemoveSpotFromCollection() {
  const { mutateAsync: publishEvent, isPending } = useNostrPublish();
  const queryClient = useQueryClient();
  const { user } = useCurrentUser();

  const removeSpotFromCollection = async ({
    collection,
    spotPubkey,
    spotIdentifier,
  }: {
    collection: SpotCollection;
    spotPubkey: string;
    spotIdentifier: string;
  }) => {
    if (!user) throw new Error('Must be logged in to modify a collection');
    if (collection.pubkey !== user.pubkey) throw new Error('You can only modify your own collections');

    const spotRef = `${SKATE_SPOT_KIND}:${spotPubkey}:${spotIdentifier}`;

    // Filter out the spot to remove
    const updatedSpotRefs = collection.spotRefs.filter(ref => ref !== spotRef);

    // Build updated tags
    const tags: string[][] = [
      ['d', collection.identifier],
      ['title', collection.title],
      ['t', 'skatespots'],
      ['alt', `Spot collection: ${collection.title}`],
    ];

    if (collection.description) {
      tags.push(['description', collection.description]);
    }

    if (collection.image) {
      tags.push(['image', collection.image]);
    }

    // Add remaining spot refs
    for (const ref of updatedSpotRefs) {
      tags.push(['a', ref]);
    }

    // Preserve foreign tags from the original event.
    tags.push(...foreignCollectionTags(collection));

    const event = await publishEvent({
      kind: SPOT_COLLECTION_KIND,
      content: collection.description || '',
      tags,
    });

    // Invalidate caches
    queryClient.invalidateQueries({ queryKey: ['spot-collections', user.pubkey] });
    queryClient.invalidateQueries({ queryKey: ['spot-collection', collection.identifier] });

    return event;
  };

  return { removeSpotFromCollection, isPending };
}

/**
 * Delete a spot collection
 */
export function useDeleteSpotCollection() {
  const { mutateAsync: publishEvent, isPending } = useNostrPublish();
  const queryClient = useQueryClient();
  const { user } = useCurrentUser();

  const deleteCollection = async (collection: SpotCollection) => {
    if (!user) throw new Error('Must be logged in to delete a collection');
    if (collection.pubkey !== user.pubkey) throw new Error('You can only delete your own collections');

    // Publish deletion event (kind 5)
    await publishEvent({
      kind: 5,
      content: 'Deleted collection',
      tags: [
        ['e', collection.id],
        ['a', `${SPOT_COLLECTION_KIND}:${collection.pubkey}:${collection.identifier}`],
      ],
    });

    // Invalidate caches
    queryClient.invalidateQueries({ queryKey: ['spot-collections', user.pubkey] });
    queryClient.invalidateQueries({ queryKey: ['spot-collection', collection.identifier] });
  };

  return { deleteCollection, isPending };
}

/**
 * Update a spot collection (title, description, image)
 */
export function useUpdateSpotCollection() {
  const { mutateAsync: publishEvent, isPending } = useNostrPublish();
  const queryClient = useQueryClient();
  const { user } = useCurrentUser();

  const updateCollection = async ({
    collection,
    title,
    description,
    image,
  }: {
    collection: SpotCollection;
    title?: string;
    description?: string;
    image?: string;
  }) => {
    if (!user) throw new Error('Must be logged in to update a collection');
    if (collection.pubkey !== user.pubkey) throw new Error('You can only update your own collections');

    const newTitle = title ?? collection.title;
    const newDescription = description ?? collection.description;
    const newImage = image ?? collection.image;

    const tags: string[][] = [
      ['d', collection.identifier],
      ['title', newTitle],
      ['t', 'skatespots'],
      ['alt', `Spot collection: ${newTitle}`],
    ];

    if (newDescription) {
      tags.push(['description', newDescription]);
    }

    if (newImage) {
      tags.push(['image', newImage]);
    }

    // Keep existing spot refs
    for (const ref of collection.spotRefs) {
      tags.push(['a', ref]);
    }

    // Preserve foreign tags from the original event.
    tags.push(...foreignCollectionTags(collection));

    const event = await publishEvent({
      kind: SPOT_COLLECTION_KIND,
      content: newDescription || '',
      tags,
    });

    // Invalidate caches
    queryClient.invalidateQueries({ queryKey: ['spot-collections', user.pubkey] });
    queryClient.invalidateQueries({ queryKey: ['spot-collection', collection.identifier] });

    return event;
  };

  return { updateCollection, isPending };
}