import { useEffect, useMemo, useRef, useState } from 'react'
import { nostrService } from '@/lib/nostr'
import type { Article } from '@/types/nostr'
import { applyFiltersAndSort } from '@/lib/articleFiltering'
import type { ArticleFilters } from '@/components/ArticleFilters'

/**
 * Hook to fetch articles published by a specific user
 */
export function useUserArticles(
  userPubkey: string,
  searchQuery: string = '',
  filters: ArticleFilters | null = null
) {
  const [articles, setArticles] = useState<Article[]>([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)
  const hasArticlesRef = useRef(false)

  useEffect(() => {
    if (!userPubkey) {
      setLoading(false)
      return
    }

    setLoading(true)
    setError(null)

    const unsubscribe = nostrService.subscribeToArticles(
      (article) => {
        if (article.pubkey === userPubkey) {
          setArticles((prev) => {
            if (prev.some((a) => a.id === article.id)) {
              return prev
            }
            const next = [article, ...prev].sort((a, b) => b.createdAt - a.createdAt)
            hasArticlesRef.current = next.length > 0
            return next
          })
          setLoading(false)
        }
      },
      100
    )

    // Timeout after 10 seconds
    const timeout = setTimeout(() => {
      setLoading(false)
    }, 10000)

    return () => {
      unsubscribe()
      clearTimeout(timeout)
    }
  }, [userPubkey])

  // Apply filters and sorting
  const filteredArticles = useMemo(() => {
    const effectiveFilters =
      filters ??
      ({
        authorPubkey: null,
        sortBy: 'newest',
        category: 'all',
      } as const)

    if (!filters && !searchQuery.trim()) {
      return articles
    }

    return applyFiltersAndSort(articles, searchQuery, effectiveFilters)
  }, [articles, searchQuery, filters])

  const loadArticleContent = async (articleId: string, authorPubkey: string) => {
    try {
      const article = await nostrService.getArticleById(articleId)
      if (article) {
        // Try to decrypt article content using decryption key from private messages
        const decryptedContent = await nostrService.getDecryptedArticleContent(articleId, authorPubkey)
        if (decryptedContent) {
          setArticles((prev) =>
            prev.map((a) =>
              a.id === articleId
                ? { ...a, content: decryptedContent, paid: true }
                : a
            )
          )
        }
        return article
      }
    } catch (e) {
      console.error('Error loading article content:', e)
      setError(e instanceof Error ? e.message : 'Failed to load article')
    }
    return null
  }

  return {
    articles: filteredArticles,
    allArticles: articles,
    loading,
    error,
    loadArticleContent,
  }
}