import React, { useEffect, useRef, useState } from 'react'
import { names } from './names.js'

// Left end of every tab bar: an editable group name (double-click). Session-only.
export default function GroupLabel({ group }) {
  const id = group.id
  const name = names.use(s => s.groups[id])
  const [editing, setEditing] = useState(false)
  const [draft, setDraft] = useState('')
  const ref = useRef(null)
  useEffect(() => { if (editing) { ref.current?.focus(); ref.current?.select() } }, [editing])
  const start = e => { e.stopPropagation(); setDraft(name || ''); setEditing(true) }
  const commit = () => { if (!editing) return; names.renameGroup(id, draft.trim()); setEditing(false) }
  return (
    <div className="grouplabel" title="double-click to name this group" onDoubleClick={start} onPointerDown={e => e.stopPropagation()}>
      {editing
        ? <input ref={ref} value={draft} placeholder="group name" onChange={e => setDraft(e.target.value)} onBlur={commit}
                 onKeyDown={e => { e.stopPropagation(); if (e.key === 'Enter') commit(); if (e.key === 'Escape') setEditing(false) }} />
        : <span className={name ? 'gname' : 'hint'}>{name || '＋ name'}</span>}
    </div>
  )
}