import { useEffect, useRef } from 'react';

/**
 * Универсальный Modal компонент
 * Простой и надёжный - работает как HistoryModal
 */
function Modal({ 
  show, 
  onClose, 
  onOpen,
  title, 
  children, 
  footer,
  size = 'md',
  backdrop = true,
  keyboard = true,
  scrollable = false,
  centered = false,
  className = ''
}) {
  const modalRef = useRef(null);

  // Управление классом modal-open на body
  useEffect(() => {
    if (show) {
      document.body.classList.add('modal-open');
      setTimeout(() => modalRef.current?.focus(), 100);
      onOpen?.();
    } else {
      document.body.classList.remove('modal-open');
    }

    return () => {
      document.body.classList.remove('modal-open');
    };
  }, [show, onOpen]);

  // Обработка ESC
  useEffect(() => {
    if (keyboard && show) {
      const handleEsc = (e) => {
        if (e.key === 'Escape') {
          onClose?.();
        }
      };
      document.addEventListener('keydown', handleEsc);
      return () => document.removeEventListener('keydown', handleEsc);
    }
  }, [keyboard, show, onClose]);

  if (!show) return null;

  const handleBackdropClick = (e) => {
    if (backdrop && e.target === e.currentTarget) {
      onClose?.();
    }
  };

  return (
    <>
      {/* Modal Backdrop */}
      <div className="modal-backdrop show" onClick={handleBackdropClick} />
      
      {/* Modal */}
      <div 
        className={`modal show d-block ${className}`}
        role="dialog" 
        aria-modal="true"
        tabIndex={-1}
        onKeyDown={(e) => { if (e.key === 'Escape') onClose?.(); }}
      >
        <div 
          className={`modal-dialog${size !== 'md' ? ` modal-${size}` : ''}${scrollable ? ' modal-dialog-scrollable' : ''}${centered ? ' modal-dialog-centered' : ''}`}
          role="document"
        >
          <div 
            className="modal-content" 
            ref={modalRef}
            tabIndex={-1}
            onKeyDown={(e) => {
              if (e.key === 'Tab') {
                const c = e.currentTarget;
                const focusable = c.querySelectorAll('button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])');
                if (!focusable || focusable.length === 0) return;
                const first = focusable[0];
                const last = focusable[focusable.length - 1];
                if (e.shiftKey && document.activeElement === first) {
                  e.preventDefault();
                  last.focus();
                } else if (!e.shiftKey && document.activeElement === last) {
                  e.preventDefault();
                  first.focus();
                }
              }
            }}
          >
            {title && (
              <div className="modal-header">
                <h5 className="modal-title">{title}</h5>
                <button 
                  type="button" 
                  className="btn-close" 
                  onClick={onClose}
                  aria-label="Закрыть"
                />
              </div>
            )}
            
            <div className="modal-body">
              {children}
            </div>
            
            {footer && (
              <div className="modal-footer">
                {footer}
              </div>
            )}
          </div>
        </div>
      </div>
    </>
  );
}

export default Modal;

/**
 * Готовые пресеты для быстрого использования
 */

export function SmallModal({ show, onClose, title, children, footer, ...props }) {
  return (
    <Modal
      show={show}
      onClose={onClose}
      title={title}
      size="sm"
      centered
      footer={footer}
      {...props}
    >
      {children}
    </Modal>
  );
}

export function LargeModal({ show, onClose, title, children, footer, scrollable = true, ...props }) {
  return (
    <Modal
      show={show}
      onClose={onClose}
      title={title}
      size="lg"
      centered
      scrollable={scrollable}
      footer={footer}
      {...props}
    >
      {children}
    </Modal>
  );
}

export function FullscreenModal({ show, onClose, title, children, footer, ...props }) {
  return (
    <Modal
      show={show}
      onClose={onClose}
      title={title}
      size="xl"
      scrollable
      footer={footer}
      {...props}
    >
      {children}
    </Modal>
  );
}