import { useEffect, useRef, useState } from 'react';
import { toastAfterReload } from '@/lib/toast';

type Props = {
  profile: { id: string; nombre?: string | null; email: string };
  adminSelf: boolean;
};

export default function BanearForm({ profile, adminSelf }: Props) {
  const dialogRef = useRef<HTMLDialogElement | null>(null);
  const firstFieldRef = useRef<HTMLTextAreaElement | null>(null);
  const errorRef = useRef<HTMLParagraphElement | null>(null);
  const [razon, setRazon] = useState('');
  const [expiresAt, setExpiresAt] = useState('');
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const titleId = `banear-${profile.id}`;
  const label = profile.nombre?.trim() || profile.email;

  const open = () => {
    if (adminSelf) return;
    setError(null);
    setRazon('');
    setExpiresAt('');
    dialogRef.current?.showModal();
    queueMicrotask(() => firstFieldRef.current?.focus());
  };
  const close = () => {
    if (loading) return;
    dialogRef.current?.close();
  };

  useEffect(() => {
    const dlg = dialogRef.current;
    if (!dlg) return;
    const onClick = (e: MouseEvent) => {
      if (e.target === dlg) close();
    };
    dlg.addEventListener('click', onClick);
    return () => dlg.removeEventListener('click', onClick);
  });

  useEffect(() => {
    if (error) errorRef.current?.focus();
  }, [error]);

  const submit = async (e: React.FormEvent) => {
    e.preventDefault();
    if (loading) return;
    const trimmed = razon.trim();
    if (trimmed.length < 5) {
      setError('La razón debe tener al menos 5 caracteres');
      return;
    }
    setLoading(true);
    setError(null);
    try {
      const payload: { profile_id: string; razon: string; expires_at?: string } = {
        profile_id: profile.id,
        razon: trimmed,
      };
      if (expiresAt) {
        payload.expires_at = new Date(expiresAt + 'T23:59:59').toISOString();
      }

      const res = await fetch('/api/admin/baneos', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(payload),
      });
      const json = await res.json().catch(() => ({}));
      if (!res.ok) throw new Error(json?.error ?? 'No se pudo banear');
      toastAfterReload({
        title: 'Usuario baneado',
        description: label,
        kind: 'success',
      });
      dialogRef.current?.close();
      location.reload();
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Error inesperado');
    } finally {
      setLoading(false);
    }
  };

  return (
    <>
      <button
        type="button"
        className="btn btn-danger text-xs px-3"
        style={{
          minHeight: '36px',
          paddingBlock: '0.25rem',
          opacity: adminSelf ? 0.5 : 1,
          cursor: adminSelf ? 'not-allowed' : undefined,
        }}
        onClick={open}
        disabled={adminSelf}
        title={adminSelf ? 'No puedes banearte a ti mismo' : undefined}
        aria-label={adminSelf ? 'No puedes banearte a ti mismo' : `Banear a ${label}`}
      >
        Banear
      </button>

      <dialog
        ref={dialogRef}
        aria-labelledby={titleId}
        className="card bg-bone-white rounded-[12px] p-0 border border-hairline-gray backdrop:bg-negro-institucional/40 w-[min(92vw,28rem)]"
        style={{ boxShadow: 'none' }}
      >
        <form onSubmit={submit} className="p-6 flex flex-col gap-4" autoComplete="off">
          <div className="flex items-start justify-between gap-3">
            <h2 id={titleId} className="text-xl text-graphite font-normal">
              Banear a {label}
            </h2>
            <button
              type="button"
              onClick={close}
              aria-label="Cerrar"
              className="rounded-[8px] p-1.5 hover:bg-linen text-graphite transition-colors leading-none"
            >
              <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" aria-hidden="true">
                <path d="M6 18L18 6M6 6l12 12" />
              </svg>
            </button>
          </div>

          <p className="text-sm text-graphite/70">
            El usuario no podrá acceder al sistema hasta ser desbaneado.
          </p>

          <div>
            <label className="label" htmlFor={`${titleId}-razon`}>
              Razón del baneo
            </label>
            <textarea
              ref={firstFieldRef}
              id={`${titleId}-razon`}
              className="input"
              rows={4}
              value={razon}
              onChange={(e) => setRazon(e.target.value)}
              required
              minLength={5}
              maxLength={500}
              aria-invalid={error ? true : undefined}
              aria-describedby={error ? `${titleId}-err` : undefined}
              placeholder="Explica el motivo — el usuario lo verá en su pantalla de bloqueo."
            />
            <p className="text-xs text-graphite/60 mt-1">
              {razon.length}/500
            </p>
          </div>

          <div>
            <label className="label" htmlFor={`${titleId}-expires`}>
              Fecha de expiración (opcional)
            </label>
            <input
              id={`${titleId}-expires`}
              type="date"
              className="input"
              value={expiresAt}
              min={new Date().toISOString().split('T')[0]}
              onChange={(e) => setExpiresAt(e.target.value)}
            />
            <p className="text-xs text-graphite/60 mt-1">
              Opcional. Si se omite, el baneo será indefinido hasta desbanear manualmente.
            </p>
          </div>

          {error && (
            <p
              ref={errorRef}
              id={`${titleId}-err`}
              role="alert"
              tabIndex={-1}
              className="text-sm text-negro-institucional"
            >
              {error}
            </p>
          )}

          <div className="flex gap-2 justify-end pt-2">
            <button type="button" className="btn btn-ghost" onClick={close} disabled={loading}>
              Cancelar
            </button>
            <button
              type="submit"
              className="btn btn-danger"
              disabled={loading}
            >
              {loading ? 'Baneando…' : 'Banear'}
            </button>
          </div>
        </form>
      </dialog>
    </>
  );
}