fix: correct RSS parsing for guid/link/title fields

fast-xml-parser returns elements with attributes (like <guid isPermaLink>)
as { "@_isPermaLink": "true", "#text": "url" } — calling String() on that
gives "[object Object]", making every torrent_id identical and causing the
UNIQUE constraint to drop all but the first episode insert.

Fixes:
- Add textOf() helper that extracts #text from attribute-bearing nodes
- Apply textOf() to guid, link, title, category, size, pubDate fields
- Add isArray config so a single-result feed still returns an array
- Use <link> directly as torrent_url (Nyaa provides the .torrent URL there)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/server/services/nyaa.ts

@@ -2,7 +2,13 @@ import { XMLParser } from 'fast-xml-parser'
 import type { NyaaItem } from '../types.js'
 
 const NYAA_BASE = 'https://nyaa.si'
-const parser = new XMLParser({ ignoreAttributes: false, attributeNamePrefix: '@_' })
+
+const parser = new XMLParser({
+  ignoreAttributes: false,
+  attributeNamePrefix: '@_',
+  // Always treat <item> as an array, even when there is only one result
+  isArray: (_name, jpath) => jpath === 'rss.channel.item',
+})
 
 /**
  * Build a Nyaa RSS URL from a search query and optional category.
@@ -45,28 +51,45 @@ export async function searchNyaa(query: string, category = '1_2'): Promise<NyaaI
   return fetchRss(url)
 }
 
+/**
+ * Extract the text value from a parsed XML field.
+ * fast-xml-parser returns elements with attributes as { "@_attr": "val", "#text": "content" }.
+ * Plain text elements come through as a string or number.
+ */
+function textOf(val: unknown): string {
+  if (val === null || val === undefined) return ''
+  if (typeof val === 'string') return val
+  if (typeof val === 'number') return String(val)
+  if (typeof val === 'object') {
+    const obj = val as Record<string, unknown>
+    // fast-xml-parser uses '#text' for mixed-content nodes
+    if ('#text' in obj) return String(obj['#text'])
+  }
+  return ''
+}
+
 function parseItem(item: Record<string, unknown>): NyaaItem {
-  const guid = String(item['guid'] ?? '')
-  // guid is like https://nyaa.si/view/1234567
-  const torrent_id = guid.split('/').pop() ?? guid
+  // <guid isPermaLink="true">https://nyaa.si/view/1234567</guid>
+  // fast-xml-parser gives us { "@_isPermaLink": "true", "#text": "https://nyaa.si/view/1234567" }
+  const guidStr = textOf(item['guid'])
+  const torrent_id = guidStr.split('/').pop() ?? guidStr
 
-  const link = String(item['link'] ?? '')
-  // link in the RSS feed is the magnet or torrent link; torrent download is /download/<id>.torrent
-  const torrent_url = torrent_id
-    ? `${NYAA_BASE}/download/${torrent_id}.torrent`
-    : link
+  // In Nyaa RSS, <link> is the direct .torrent download URL:
+  // https://nyaa.si/download/1234567.torrent
+  const linkStr = textOf(item['link'])
+  const torrent_url = linkStr || (torrent_id ? `${NYAA_BASE}/download/${torrent_id}.torrent` : '')
 
-  // Nyaa RSS uses nyaa: namespace for extended fields
+  // Nyaa namespace fields (nyaa:seeders, nyaa:size, etc.)
   const magnet = item['nyaa:magnetUri'] ?? item['nyaa:magnetLink'] ?? null
-  const category = String(item['nyaa:category'] ?? item['category'] ?? '')
-  const size = String(item['nyaa:size'] ?? '')
+  const category = textOf(item['nyaa:category'] ?? item['category'])
+  const size = textOf(item['nyaa:size'])
   const seeders = Number(item['nyaa:seeders'] ?? 0)
   const leechers = Number(item['nyaa:leechers'] ?? 0)
   const downloads = Number(item['nyaa:downloads'] ?? 0)
 
   return {
     torrent_id,
-    title: String(item['title'] ?? ''),
+    title: textOf(item['title']),
     torrent_url,
     magnet_url: magnet ? String(magnet) : null,
     category,
@@ -74,28 +97,28 @@ function parseItem(item: Record<string, unknown>): NyaaItem {
     seeders,
     leechers,
     downloads,
-    published: String(item['pubDate'] ?? ''),
+    published: textOf(item['pubDate']),
   }
 }
 
 /**
  * Parse an episode number from a torrent title.
- * Handles common patterns: " - 12", "[12]", "E12", "EP12", " 12 "
+ * Handles common patterns: " - 12", "[12]", "E12", "EP12", "S01E12"
  * Returns the matched string or 'unknown'.
  */
 export function parseEpisodeCode(title: string): string {
-  // Match patterns like " - 12 " or " - 12v2"
+  // Match " - 12 " or " - 12v2"
   let m = title.match(/\s-\s(\d{1,4}(?:\.\d)?(?:v\d)?)\s/)
   if (m) return m[1]
-  // Match [12] or [12v2]
+  // Match [12] or [12v2]  (but skip hash-like 6+ char hex blocks e.g. [CC3FE38D])
   m = title.match(/\[(\d{1,4}(?:\.\d)?(?:v\d)?)\]/)
   if (m) return m[1]
-  // Match EP12 or E12
-  m = title.match(/[Ee][Pp]?(\d{1,4})/)
-  if (m) return m[1]
   // Match S01E12
   m = title.match(/[Ss]\d{1,2}[Ee](\d{1,4})/)
   if (m) return m[1]
+  // Match EP12 or E12
+  m = title.match(/[Ee][Pp]?(\d{1,4})/)
+  if (m) return m[1]
   return 'unknown'
 }