import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import '../theme/app_colors.dart';

/// Función estándar para abrir modales médicos en Hidalyx Med.
/// 
/// Cumple con la regla institucional estricta:
/// - barrierDismissible: false (NO se cierra haciendo clic en el exterior).
/// - Solamente se cierra mediante la tecla ESC o el botón (X) superior derecho.
Future<T?> showMedicalModal<T>({
  required BuildContext context,
  required WidgetBuilder builder,
  bool useRootNavigator = true,
}) {
  return showDialog<T>(
    context: context,
    barrierDismissible: false,
    barrierColor: Colors.black.withValues(alpha: 0.5),
    useRootNavigator: useRootNavigator,
    builder: builder,
  );
}

/// Contenedor base estándar para todos los modales de Hidalyx Med.
///
/// Implementa:
/// 1. Cierre garantizado con tecla [ESC] a nivel hardware y de atajos.
/// 2. Botón con icono de cerrar (X) en la esquina superior derecha.
/// 3. Bloqueo de cierre al tocar fuera del diálogo.
class MedicalModalDialog extends StatefulWidget {
  final Widget? titleIcon;
  final String title;
  final Widget? subtitle;
  final Widget child;
  final double maxWidth;
  final double maxHeight;
  final VoidCallback? onClose;
  final Widget? bottomBar;
  final List<Widget>? actions;

  const MedicalModalDialog({
    super.key,
    this.titleIcon,
    required this.title,
    this.subtitle,
    required this.child,
    this.maxWidth = 740,
    this.maxHeight = 620,
    this.onClose,
    this.bottomBar,
    this.actions,
  });

  @override
  State<MedicalModalDialog> createState() => _MedicalModalDialogState();
}

class _MedicalModalDialogState extends State<MedicalModalDialog> {
  @override
  void initState() {
    super.initState();
    HardwareKeyboard.instance.addHandler(_handleHardwareKey);
  }

  @override
  void dispose() {
    HardwareKeyboard.instance.removeHandler(_handleHardwareKey);
    super.dispose();
  }

  bool _handleHardwareKey(KeyEvent event) {
    if (event is KeyDownEvent && event.logicalKey == LogicalKeyboardKey.escape) {
      _close();
      return true;
    }
    return false;
  }

  void _close() {
    if (!mounted) return;
    if (widget.onClose != null) {
      widget.onClose!();
    } else {
      Navigator.of(context).maybePop();
    }
  }

  @override
  Widget build(BuildContext context) {
    return Dialog(
      backgroundColor: Colors.transparent,
      insetPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 24),
      child: Container(
        constraints: BoxConstraints(
          maxWidth: widget.maxWidth,
          maxHeight: widget.maxHeight,
          minWidth: 320,
        ),
        decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.circular(16),
          boxShadow: [
            BoxShadow(
              color: Colors.black.withValues(alpha: 0.18),
              blurRadius: 28,
              offset: const Offset(0, 10),
            ),
          ],
        ),
        child: ClipRRect(
          borderRadius: BorderRadius.circular(16),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              // Encabezado Superior con Botón (X) de Cierre
              Container(
                padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
                decoration: const BoxDecoration(
                  color: Colors.white,
                  border: Border(
                    bottom: BorderSide(color: AppColors.border),
                  ),
                ),
                child: Row(
                  children: [
                    if (widget.titleIcon != null) ...[
                      widget.titleIcon!,
                      const SizedBox(width: 12),
                    ],
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            widget.title,
                            style: const TextStyle(
                              fontSize: 16,
                              fontWeight: FontWeight.w700,
                              color: AppColors.textPrimary,
                            ),
                          ),
                          if (widget.subtitle != null) ...[
                            const SizedBox(height: 2),
                            widget.subtitle!,
                          ],
                        ],
                      ),
                    ),
                    if (widget.actions != null) ...[
                      ...widget.actions!,
                      const SizedBox(width: 8),
                    ],
                    // Botón oficial de cerrar (X) en esquina superior derecha
                    IconButton(
                      icon: const Icon(
                        Icons.close_rounded,
                        color: AppColors.textSecondary,
                        size: 20,
                      ),
                      tooltip: 'Cerrar (Esc)',
                      splashRadius: 20,
                      onPressed: _close,
                    ),
                  ],
                ),
              ),

              // Contenido Principal
              Expanded(child: widget.child),

              // Barra Inferior Informativa (Opcional)
              if (widget.bottomBar != null) widget.bottomBar!,
            ],
          ),
        ),
      ),
    );
  }
}