"use client";

import React, { useEffect, useRef } from 'react';
import { createRoot, Root } from 'react-dom/client';
import { BadgeCent, X } from 'lucide-react';

interface InsufficientDetail {
  current_balance?: number;
  required_tokens?: number;
  message?: string;
}

interface InsufficientModalProps {
  detail?: InsufficientDetail;
  onClose?: () => void;
}

function InsufficientPointsModal(props: InsufficientModalProps) {
  const { detail, onClose } = props;
  const containerRef = useRef<HTMLDivElement | null>(null);

  useEffect(() => {
    const originalOverflow = document.body.style.overflow;
    document.body.style.overflow = 'hidden';
    return () => {
      document.body.style.overflow = originalOverflow;
    };
  }, []);

  const titleText = 'Insufficient credits reminder';
  const descriptionText =
    detail?.message || 'Your credits are insufficient, please upgrade to continue.';

  return (
    <div
      ref={containerRef}
      data-alt="insufficient-overlay"
      className="fixed inset-0 z-[1000] flex items-center justify-center bg-black/60"
    >
      <div
        data-alt="insufficient-modal"
        className="relative w-11/12 max-w-sm rounded-2xl bg-white/5 border border-white/10 backdrop-blur-xl shadow-2xl p-6 text-white"
        role="dialog"
        aria-modal="true"
        aria-labelledby="insufficient-title"
      >
        <button
            data-alt="close-button"
            className="absolute top-4 right-4 w-6 h-6 rounded-full bg-white/10 hover:bg-white/20 border border-white/10 flex items-center justify-center text-white transition-all active:scale-95"
            onClick={onClose}
            aria-label="Close"
        >
            <X size={14} />
        </button>
        <div data-alt="modal-header" className="flex flex-col items-center text-center gap-2">
          <div data-alt="modal-icon" className="w-10 h-10 rounded-full bg-white/10 flex items-center justify-center text-lg text-[#ab50d0]">
            <BadgeCent />
          </div>
          <h3 id="insufficient-title" data-alt="modal-title" className="text-base font-semibold">
            {titleText}
          </h3>
        </div>

        <div data-alt="modal-body" className="mt-4 space-y-4">
          <p data-alt="modal-description" className="text-sm text-white/80">
            {descriptionText}
          </p>

          {(typeof detail?.current_balance !== 'undefined') && (typeof detail?.required_tokens !== 'undefined') && (
            <div data-alt="stats-grid" className="grid grid-cols-2 gap-3">
              <div data-alt="stat-balance" className="rounded-lg bg-white/5 border border-white/10 p-3">
                <div className="text-[11px] text-white/60">Current balance</div>
                <div className="text-sm font-medium">{detail?.current_balance}</div>
              </div>
              <div data-alt="stat-required" className="rounded-lg bg-white/5 border border-white/10 p-3">
                <div className="text-[11px] text-white/60">Required</div>
                <div className="text-sm font-medium">{detail?.required_tokens}</div>
              </div>
            </div>
          )}
        </div>

        <div data-alt="modal-actions" className="mt-6 space-y-3">
          <button
            data-alt="upgrade-button"
            className="w-full px-4 py-2 rounded-lg bg-[#9144b0] text-white font-medium transition-colors"
            onClick={() => {
              window.location.href = '/pricing';
              onClose?.();
            }}
          >
            Upgrade to continue →
          </button>
        </div>
      </div>
    </div>
  );
}

/**
 * Opens an H5-styled modal to notify insufficient credits.
 * @param {InsufficientDetail} detail - optional detail including balances and message.
 */
export function showInsufficientPointsNotification(detail?: InsufficientDetail): void {
  if (typeof window === 'undefined' || typeof document === 'undefined') {
    return;
  }

  const mount = document.createElement('div');
  mount.setAttribute('data-alt', 'insufficient-modal-root');
  document.body.appendChild(mount);

  let root: Root | null = null;
  try {
    root = createRoot(mount);
  } catch {
    if (mount.parentNode) {
      mount.parentNode.removeChild(mount);
    }
    return;
  }

  const close = () => {
    try {
      root?.unmount();
    } finally {
      if (mount.parentNode) {
        mount.parentNode.removeChild(mount);
      }
    }
  };

  root.render(
    <InsufficientPointsModal detail={detail} onClose={close} />
  );
}