import { useState } from 'react'
import { RECURRING_STATUSES, RECURRING_STATUS_LABELS } from '../constants/status.js'
import { StatusBadge } from './StatusBadge.jsx'
import { EmptyState } from './EmptyState.jsx'

function formatDueAt(iso) {
  if (!iso) return null
  try {
    return new Date(iso).toLocaleString('de-DE')
  } catch {
    return iso
  }
}

export function RecurringSection({ items, canManage, onCreate, onUpdateStatus, onDelete, busy }) {
  const [title, setTitle] = useState('')
  const [nextDueAt, setNextDueAt] = useState('')
  const [showForm, setShowForm] = useState(false)

  async function handleSubmit(e) {
    e.preventDefault()
    if (!title.trim()) return
    await onCreate({
      title: title.trim(),
      next_due_at: nextDueAt ? new Date(nextDueAt).toISOString() : null,
    })
    setTitle('')
    setNextDueAt('')
    setShowForm(false)
  }

  return (
    <section className="card">
      <div className="section-header">
        <h2>Wiederkehrend</h2>
        {canManage && (
          <button
            type="button"
            className="btn btn-primary btn-block-mobile"
            onClick={() => setShowForm((v) => !v)}
          >
            {showForm ? 'Abbrechen' : 'Element anlegen'}
          </button>
        )}
      </div>

      {showForm && canManage && (
        <form className="inline-form-block" onSubmit={handleSubmit}>
          <label>
            Titel
            <input
              value={title}
              onChange={(e) => setTitle(e.target.value)}
              maxLength={255}
              required
            />
          </label>
          <label>
            Nächste Fälligkeit
            <input
              type="datetime-local"
              value={nextDueAt}
              onChange={(e) => setNextDueAt(e.target.value)}
            />
          </label>
          <button type="submit" className="btn btn-primary" disabled={busy}>
            Anlegen
          </button>
        </form>
      )}

      {items.length === 0 && <EmptyState message="Keine wiederkehrenden Elemente." />}

      <ul className="item-list">
        {items.map((item) => (
          <li key={item.id} className="list-item card-list-item">
            <div className="list-item-main">
              <strong>{item.title}</strong>
              {item.next_due_at && (
                <p className="muted list-item-sub">Fällig: {formatDueAt(item.next_due_at)}</p>
              )}
            </div>
            <div className="list-item-meta action-controls">
              <StatusBadge kind="recurring" status={item.status} />
              {canManage && (
                <>
                  <select
                    className="inline-select"
                    value={item.status}
                    onChange={(e) => onUpdateStatus(item.id, e.target.value)}
                    aria-label="Recurring-Status"
                  >
                    {RECURRING_STATUSES.map((s) => (
                      <option key={s} value={s}>
                        {RECURRING_STATUS_LABELS[s]}
                      </option>
                    ))}
                  </select>
                  <button
                    type="button"
                    className="btn btn-secondary"
                    onClick={() => onDelete(item.id)}
                  >
                    Löschen
                  </button>
                </>
              )}
            </div>
          </li>
        ))}
      </ul>
    </section>
  )
}