'use client';

import { useState, useRef, useEffect } from 'react';
import { createPortal } from 'react-dom';
import { useTranslations, useLocale } from 'next-intl';
import { cn } from '@/components/ui/utils';
import { requestBrochureAction } from '@/app/actions/brochure';
import { useAnalytics } from './analytics/useAnalytics';
import { AnalyticsEvents } from './analytics/analytics-events';

interface BrochureModalProps {
  isOpen: boolean;
  onClose: () => void;
}

export default function BrochureModal({ isOpen, onClose }: BrochureModalProps) {
  const t = useTranslations('Brochure');
  const locale = useLocale();
  const { trackEvent } = useAnalytics();
  const formRef = useRef<HTMLFormElement>(null);
  const modalRef = useRef<HTMLDivElement>(null);
  const [state, setState] = useState<'idle' | 'submitting' | 'success' | 'error'>('idle');
  const [errorMsg, setErrorMsg] = useState('');

  // Close on escape + lock scroll + focus trap
  useEffect(() => {
    if (!isOpen) return;

    // Auto-focus input when opened
    const firstInput = document.getElementById('brochure-email');
    if (firstInput) {
      setTimeout(() => firstInput.focus(), 50);
    }

    const handleKeyDown = (e: KeyboardEvent) => {
      if (e.key === 'Escape') onClose();

      if (e.key === 'Tab' && modalRef.current) {
        const focusable = modalRef.current.querySelectorAll(
          'button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])',
        ) as NodeListOf<HTMLElement>;

        if (focusable.length > 0) {
          const first = focusable[0];
          const last = focusable[focusable.length - 1];

          if (e.shiftKey && document.activeElement === first) {
            last.focus();
            e.preventDefault();
          } else if (!e.shiftKey && document.activeElement === last) {
            first.focus();
            e.preventDefault();
          }
        }
      }
    };

    document.addEventListener('keydown', handleKeyDown);
    // Strict overflow lock on mobile as well
    document.body.style.setProperty('overflow', 'hidden', 'important');

    return () => {
      document.removeEventListener('keydown', handleKeyDown);
      document.body.style.overflow = '';
    };
  }, [isOpen, onClose]);

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!formRef.current) return;

    setState('submitting');
    setErrorMsg('');

    try {
      const formData = new FormData(formRef.current);
      formData.set('locale', locale);

      const result = await requestBrochureAction(formData);

      if (result.success) {
        setState('success');
        trackEvent(AnalyticsEvents.DOWNLOAD, {
          file_name: `klz-product-catalog-${locale}.pdf`,
          file_type: 'brochure',
          location: 'brochure_modal',
        });
      } else {
        setState('error');
        setErrorMsg(result.error || 'Something went wrong');
      }
    } catch {
      setState('error');
      setErrorMsg('Network error');
    }
  };

  const handleClose = () => {
    setState('idle');
    setErrorMsg('');
    onClose();
  };

  if (!isOpen) return null;

  const modal = (
    <div
      className="fixed inset-0 z-[9999] flex items-center justify-center p-4"
      role="dialog"
      aria-modal="true"
    >
      {/* Backdrop */}
      <div
        className="absolute inset-0 bg-black/70 backdrop-blur-sm"
        onClick={handleClose}
        aria-hidden="true"
      />

      {/* Modal Panel */}
      <div
        ref={modalRef}
        className="relative z-10 w-full max-w-md rounded-[28px] bg-[#000d26] border border-white/10 shadow-[0_40px_80px_rgba(0,0,0,0.6)] overflow-hidden"
      >
        {/* Accent bar at top */}
        <div className="h-1 w-full bg-gradient-to-r from-[#82ed20] via-[#5cb516] to-[#82ed20]" />

        {/* Close Button */}
        <button
          type="button"
          onClick={handleClose}
          className="absolute top-4 right-4 z-10 flex h-8 w-8 items-center justify-center rounded-full bg-white/5 text-white/40 hover:bg-white/10 hover:text-white transition-colors cursor-pointer"
          aria-label={t('close')}
        >
          <svg className="h-4 w-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
            <path
              strokeLinecap="round"
              strokeLinejoin="round"
              strokeWidth={2}
              d="M6 18L18 6M6 6l12 12"
            />
          </svg>
        </button>

        <div className="p-8 pt-7">
          {/* Icon + Header */}
          <div className="mb-7">
            <div className="flex h-12 w-12 items-center justify-center rounded-2xl bg-[#82ed20]/10 border border-[#82ed20]/20 mb-4">
              <svg
                className="h-6 w-6 text-[#82ed20]"
                fill="none"
                stroke="currentColor"
                viewBox="0 0 24 24"
              >
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  strokeWidth={1.5}
                  d="M12 6.253v13m0-13C10.832 5.477 9.246 5 7.5 5S4.168 5.477 3 6.253v13C4.168 18.477 5.754 18 7.5 18s3.332.477 4.5 1.253m0-13C13.168 5.477 14.754 5 16.5 5c1.747 0 3.332.477 4.5 1.253v13C19.832 18.477 18.247 18 16.5 18c-1.746 0-3.332.477-4.5 1.253"
                />
              </svg>
            </div>
            <h2 className="text-2xl font-black text-white uppercase tracking-tight leading-none mb-2">
              {t('title')}
            </h2>
            <p className="text-sm text-white/50 leading-relaxed">{t('subtitle')}</p>
          </div>

          {state === 'success' ? (
            <div>
              <div className="flex items-center gap-3 mb-6 p-4 rounded-2xl bg-[#82ed20]/10 border border-[#82ed20]/20">
                <div className="flex h-9 w-9 shrink-0 items-center justify-center rounded-xl bg-[#82ed20]/20">
                  <svg
                    className="h-5 w-5 text-[#82ed20]"
                    fill="none"
                    stroke="currentColor"
                    viewBox="0 0 24 24"
                  >
                    <path
                      strokeLinecap="round"
                      strokeLinejoin="round"
                      strokeWidth={2}
                      d="M5 13l4 4L19 7"
                    />
                  </svg>
                </div>
                <div>
                  <p className="text-sm font-bold text-[#82ed20]">
                    {locale === 'de' ? 'Erfolgreich gesendet' : 'Successfully sent'}
                  </p>
                  <p className="text-xs text-white/50 mt-0.5">
                    {locale === 'de'
                      ? 'Bitte prüfen Sie Ihren Posteingang.'
                      : 'Please check your inbox.'}
                  </p>
                </div>
              </div>
              <button
                type="button"
                onClick={handleClose}
                className="flex items-center justify-center gap-3 w-full py-4 px-6 rounded-2xl bg-white/10 hover:bg-white/20 text-white font-black text-sm uppercase tracking-widest transition-colors"
              >
                {t('close')}
              </button>
            </div>
          ) : (
            <form ref={formRef} onSubmit={handleSubmit}>
              <div className="mb-5">
                <label
                  htmlFor="brochure-email"
                  className="block text-[10px] font-black uppercase tracking-[0.2em] text-white/40 mb-2"
                >
                  {t('emailLabel')}
                </label>
                <input
                  id="brochure-email"
                  name="email"
                  type="email"
                  required
                  autoComplete="email"
                  placeholder={t('emailPlaceholder')}
                  className="w-full rounded-xl bg-white/5 border border-white/10 px-4 py-3.5 text-white placeholder:text-white/20 text-sm font-medium focus:outline-none focus:border-[#82ed20]/40 transition-colors"
                  disabled={state === 'submitting'}
                />
              </div>

              {state === 'error' && errorMsg && (
                <p className="text-red-400 text-xs mb-4 font-medium">{errorMsg}</p>
              )}

              <button
                type="submit"
                disabled={state === 'submitting'}
                className={cn(
                  'w-full py-4 px-6 rounded-2xl font-black text-sm uppercase tracking-widest transition-colors',
                  state === 'submitting'
                    ? 'bg-white/10 text-white/40 cursor-wait'
                    : 'bg-[#82ed20] hover:bg-[#6dd318] text-[#000d26]',
                )}
              >
                {state === 'submitting' ? t('submitting') : t('submit')}
              </button>

              <p className="mt-4 text-[10px] text-white/25 text-center leading-relaxed">
                {t('privacyNote')}
              </p>
            </form>
          )}
        </div>
      </div>
    </div>
  );

  return createPortal(modal, document.body);
}