'use client'

import { useRouter } from 'next/navigation'
import { useEffect, useRef, useState } from 'react'
import { authFetch, getApiBase } from '../lib/auth'
import { canAccess } from '../lib/features'
import { useFeatureUser } from './FeatureGate'

type SearchResult = {
  title: string
  year?: number | null
  type: 'movie' | 'tv'
  tmdbId: number
  requestId?: number | null
  statusLabel?: string | null
}

export default function GlobalSearch() {
  const router = useRouter()
  const { user, ready } = useFeatureUser()
  const root = useRef<HTMLDivElement>(null)
  const requestVersion = useRef(0)
  const [query, setQuery] = useState('')
  const [results, setResults] = useState<SearchResult[]>([])
  const [open, setOpen] = useState(false)
  const [searching, setSearching] = useState(false)
  const [message, setMessage] = useState<string | null>(null)
  const canSearch = canAccess(user, 'new_requests') || canAccess(user, 'issues')
  const canOpenRequests = canAccess(user, 'requests')
  const canCreateRequests = canAccess(user, 'new_requests')

  useEffect(() => {
    const close = (event: PointerEvent) => {
      if (!root.current?.contains(event.target as Node)) setOpen(false)
    }
    document.addEventListener('pointerdown', close)
    return () => document.removeEventListener('pointerdown', close)
  }, [])

  useEffect(() => {
    const term = query.trim()
    requestVersion.current += 1
    const version = requestVersion.current
    if (term.length < 2 || !canSearch) {
      setResults([])
      setSearching(false)
      setMessage(null)
      return
    }
    setSearching(true)
    setMessage(null)
    const controller = new AbortController()
    const timer = window.setTimeout(async () => {
      try {
        const params = new URLSearchParams({ query: term })
        const response = await authFetch(`${getApiBase()}/requests/search?${params.toString()}`, {
          signal: controller.signal,
          cache: 'no-store',
        })
        if (!response.ok) throw new Error('Search is unavailable right now.')
        const payload = await response.json()
        if (version !== requestVersion.current) return
        const mapped = (Array.isArray(payload?.results) ? payload.results : [])
          .filter((item: any) => ['movie', 'tv'].includes(item?.type) && Number(item?.tmdbId) > 0)
          .slice(0, 7)
          .map((item: any): SearchResult => ({
            title: String(item?.title || 'Untitled'),
            year: typeof item?.year === 'number' ? item.year : null,
            type: item.type,
            tmdbId: Number(item.tmdbId),
            requestId: typeof item?.requestId === 'number' ? item.requestId : null,
            statusLabel: typeof item?.statusLabel === 'string' ? item.statusLabel : null,
          }))
        setResults(mapped)
        setMessage(mapped.length ? null : 'No matching titles found.')
      } catch (error) {
        if (controller.signal.aborted || version !== requestVersion.current) return
        console.error(error)
        setResults([])
        setMessage('Search is unavailable right now.')
      } finally {
        if (version === requestVersion.current) setSearching(false)
      }
    }, 280)
    return () => {
      window.clearTimeout(timer)
      controller.abort()
    }
  }, [query, canSearch])

  if (!ready || !user || !canSearch) return null

  const openResult = (result: SearchResult) => {
    setOpen(false)
    setQuery('')
    if (result.requestId && canOpenRequests) {
      router.push(`/requests/${result.requestId}`)
      return
    }
    if (canCreateRequests) {
      const params = new URLSearchParams({ type: result.type, query: result.title })
      router.push(`/new-requests?${params.toString()}`)
      return
    }
    router.push('/portal/issues')
  }

  const showResults = open && query.trim().length >= 2
  return (
    <div className="global-search" ref={root}>
      <search>
      <form onSubmit={(event) => {
        event.preventDefault()
        if (results[0]) openResult(results[0])
      }}>
        <svg viewBox="0 0 24 24" aria-hidden="true"><circle cx="11" cy="11" r="7" /><path d="m16 16 4 4" /></svg>
        <input
          type="search"
          role="combobox"
          value={query}
          placeholder="Search titles or requests"
          aria-label="Search titles or requests"
          aria-autocomplete="list"
          aria-expanded={showResults}
          aria-controls="global-search-results"
          onFocus={() => setOpen(true)}
          onKeyDown={(event) => { if (event.key === 'Escape') setOpen(false) }}
          onChange={(event) => { setQuery(event.target.value); setOpen(true) }}
        />
        {searching && <i className="global-search-spinner" aria-hidden="true" />}
      </form>
      </search>
      {showResults && (
        <div className="global-search-results" id="global-search-results" role="listbox">
          {results.map((result) => (
            <button type="button" role="option" aria-selected="false" key={`${result.type}:${result.tmdbId}`} onClick={() => openResult(result)}>
              <span><strong>{result.title}</strong><small>{result.type === 'tv' ? 'TV show' : 'Movie'}{result.year ? ` · ${result.year}` : ''}</small></span>
              <b>{result.requestId && canOpenRequests ? result.statusLabel || 'View request' : canCreateRequests ? 'New request' : 'Report issue'}</b>
            </button>
          ))}
          {!searching && message && <p role="status">{message}</p>}
        </div>
      )}
    </div>
  )
}