'use client'

import { useEffect, useRef, useState } from 'react'
import { authFetch, getApiBase } from '../../lib/auth'
import type { Row } from './page'

type Preview = { revision: string; server_id: string; row: Row }

export default function ResolveIdentityLink({ row, accounts, onClose, onSaved }: {
  row: Row; accounts: { id: string; name: string }[]; onClose: () => void; onSaved: () => void
}) {
  const dialog = useRef<HTMLDialogElement>(null)
  const controller = useRef<AbortController | null>(null)
  const [chosen, setChosen] = useState('')
  const [preview, setPreview] = useState<Preview | null>(null)
  const [busy, setBusy] = useState(false)
  const [saving, setSaving] = useState(false)
  const [error, setError] = useState('')

  useEffect(() => {
    const previous = document.activeElement as HTMLElement | null
    const overflow = document.body.style.overflow
    document.body.style.overflow = 'hidden'
    dialog.current?.showModal()
    return () => {
      controller.current?.abort()
      document.body.style.overflow = overflow
      previous?.focus()
    }
  }, [])

  const submit = async (confirm: boolean) => {
    if (!chosen || busy || saving || (confirm && !preview?.row.can_confirm)) return
    const abort = new AbortController()
    controller.current = abort
    setError('')
    if (confirm) setSaving(true)
    else { setBusy(true); setPreview(null) }
    try {
      const response = await authFetch(`${getApiBase()}/admin/identities/resolve/${confirm ? 'confirm' : 'check'}`, {
        method: 'POST', signal: abort.signal, headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ user_id: row.user.id, jellyfin_user_id: chosen, ...(confirm ? { revision: preview?.revision } : {}) }),
      })
      const data = await response.json().catch(() => ({}))
      if (!response.ok) throw new Error(response.status === 401 ? 'Your session has ended. Sign in again.' : typeof data.detail === 'string' ? data.detail : 'Could not check the account links. Try again.')
      if (!abort.signal.aborted) {
        if (confirm) onSaved()
        else setPreview(data)
      }
    } catch (err) {
      if (!abort.signal.aborted) {
        setError(err instanceof Error ? err.message : 'Could not resolve the link.')
        setPreview(null)
      }
    } finally { if (!abort.signal.aborted) { setBusy(false); setSaving(false) } }
  }

  return <dialog ref={dialog} className="identity-resolve-dialog" aria-labelledby="resolve-title" onCancel={(event) => { event.preventDefault(); if (!saving) onClose() }}>
    <div className="identity-resolve-content">
      <header><h2 id="resolve-title">Resolve missing link</h2><button type="button" className="ghost-button" onClick={onClose} disabled={saving}>Close</button></header>
      <p>Link <strong>{row.user.username}</strong> (Magent {row.user.id}) to their Jellyfin account. Review the IDs below to confirm this is the same person.</p>
      <label>Jellyfin account<select value={chosen} disabled={saving} onChange={(event) => {
        controller.current?.abort(); setBusy(false); setPreview(null); setError(''); setChosen(event.target.value)
      }}><option value="">Choose an account</option>{[...accounts].sort((a, b) => a.name.localeCompare(b.name)).map((account) => <option key={account.id} value={account.id}>{account.name} — {account.id}</option>)}</select></label>
      <button type="button" onClick={() => void submit(false)} disabled={!chosen || busy || saving}>{busy ? 'Checking all platform links…' : 'Check selected account'}</button>
      {error && <p className="error-banner" role="alert">{error}</p>}
      {busy && <p role="status">Checking live IDs and whether another Magent account already owns this identity.</p>}
      {preview && <section className="identity-confirm-panel" aria-label="Selected account links" aria-live="polite">
        <h3>{preview.row.can_confirm ? 'Ready to confirm' : 'This link needs attention'}</h3>
        <p className="identity-meta">Jellyfin server <code>{preview.server_id ?? 'Unavailable'}</code></p>
        <dl className="identity-mapping">
          <div><dt>Jellyfin</dt><dd>{preview.row.jellyfin?.name ?? 'Account not found'}<code>{preview.row.candidate_jellyfin_id}</code></dd></div>
          <div><dt>Seerr</dt><dd>{preview.row.seerr.length ? preview.row.seerr.map((account) => `${account.name} (ID ${account.id})`).join(', ') : 'No matching Jellyfin ID. Check this user’s Jellyfin account link in Seerr, then check again.'}</dd></div>
          <div><dt>Jellystat</dt><dd><code>{preview.row.jellystat.id ?? 'Not verified'}</code>{preview.row.jellystat.state === 'matched' ? 'Same Jellyfin ID verified' : preview.row.jellystat.state === 'missing' ? 'This ID is missing from Jellystat. Check its Jellyfin sync, then check again.' : 'Could not verify this ID. Check the Jellystat connection and try again.'}</dd></div>
        </dl>
        {preview.row.issues.length > 0 && <ul className="identity-issues">{preview.row.issues.map((issue) => <li key={issue}>{issue}</li>)}</ul>}
        {preview.row.state === 'unavailable' && <p>A required service is unavailable. Restore its connection and check again.</p>}
        <p>Saving stores the verified Jellyfin and Seerr links in Magent, with your administrator name and confirmation time. All platform IDs and duplicate ownership are checked again before saving.</p>
        <button type="button" disabled={!preview.row.can_confirm || saving} onClick={() => void submit(true)}>{saving ? 'Rechecking and saving…' : 'Confirm and save link'}</button>
      </section>}
    </div>
  </dialog>
}