'use client';
import React, { useEffect, useRef } from 'react';
import { clsx } from 'clsx';
import { twMerge } from 'tailwind-merge';

export interface ModalProps {
  open: boolean;
  onClose: () => void;
  title?: string;
  children: React.ReactNode;
  footer?: React.ReactNode;
  className?: string;
}

export const Modal: React.FC<ModalProps> = ({
  open,
  onClose,
  title,
  children,
  footer,
  className,
}) => {
  const overlayRef = useRef<HTMLDivElement>(null);

  // Close on Escape
  useEffect(() => {
    if (!open) return;
    const handler = (e: KeyboardEvent) => {
      if (e.key === 'Escape') onClose();
    };
    document.addEventListener('keydown', handler);
    return () => document.removeEventListener('keydown', handler);
  }, [open, onClose]);

  // Lock body scroll
  useEffect(() => {
    if (open) {
      document.body.style.overflow = 'hidden';
      return () => {
        document.body.style.overflow = '';
      };
    }
  }, [open]);

  if (!open) return null;

  return (
    <div
      ref={overlayRef}
      className="fixed inset-0 z-50 flex items-center justify-center p-4"
      onClick={(e) => {
        if (e.target === overlayRef.current) onClose();
      }}
    >
      {/* Backdrop */}
      <div
        className={clsx(
          'absolute inset-0 bg-black/60 backdrop-blur-sm',
          'animate-[fadeIn_0.15s_ease-out]',
        )}
      />

      {/* Panel */}
      <div
        role="dialog"
        aria-modal="true"
        aria-label={title}
        className={twMerge(
          clsx(
            'relative z-10 w-full max-w-lg',
            'bg-gray-900 border border-gray-700 rounded-2xl shadow-2xl shadow-black/40',
            'animate-[scaleIn_0.2s_ease-out]',
            'flex flex-col max-h-[85vh]',
          ),
          className,
        )}
      >
        {/* Header */}
        {title && (
          <div className="flex items-center justify-between px-6 py-4 border-b border-gray-800">
            <h2 className="text-lg font-semibold text-gray-100">{title}</h2>
            <button
              onClick={onClose}
              className="text-gray-500 hover:text-gray-300 transition-colors rounded-lg p-1 hover:bg-gray-800"
              aria-label="Close modal"
            >
              <svg className="h-5 w-5" fill="none" viewBox="0 0 24 24" strokeWidth={2} stroke="currentColor">
                <path strokeLinecap="round" strokeLinejoin="round" d="M6 18 18 6M6 6l12 12" />
              </svg>
            </button>
          </div>
        )}

        {/* Body */}
        <div className="flex-1 overflow-y-auto px-6 py-4">{children}</div>

        {/* Footer */}
        {footer && (
          <div className="flex items-center justify-end gap-3 px-6 py-4 border-t border-gray-800">
            {footer}
          </div>
        )}
      </div>
    </div>
  );
};

Modal.displayName = 'Modal';