'use client';

import { useEffect, useRef } from 'react';
import { useTranslations } from 'next-intl';
import { WIDGET_REGISTRY, type WidgetType } from './widget-registry';

interface WidgetCatalogModalProps {
  isOpen: boolean;
  onClose: () => void;
  onAddWidget: (type: WidgetType) => void;
}

const WIDGET_TYPES: WidgetType[] = [
  'clock',
  'search',
  'calendar',
  'note',
  'calculator',
  'favorites',
  'stopwatch',
];

/**
 * Modal dialog showing available widget types as selectable cards.
 * Click on a card adds the widget to the dashboard and closes the modal.
 * Escape to close, click outside to close, focus trap (D-01 flow).
 */
export function WidgetCatalogModal({
  isOpen,
  onClose,
  onAddWidget,
}: WidgetCatalogModalProps) {
  const t = useTranslations('widgets');
  const dialogRef = useRef<HTMLDivElement>(null);

  // Focus trap + Escape handler
  useEffect(() => {
    if (!isOpen) return;

    function handleKeyDown(e: KeyboardEvent) {
      if (e.key === 'Escape') {
        onClose();
      }
    }

    document.addEventListener('keydown', handleKeyDown);
    // Focus the dialog on open
    dialogRef.current?.focus();

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

  if (!isOpen) return null;

  return (
    <div
      className="fixed inset-0 z-50 flex items-center justify-center"
      onClick={onClose}
    >
      {/* Backdrop — visually only, hidden from assistive tech */}
      <div className="fixed inset-0 bg-black/50" aria-hidden="true" />

      {/* Dialog */}
      <div
        ref={dialogRef}
        role="dialog"
        aria-modal="true"
        aria-label={t('catalogTitle')}
        className="relative z-50 w-full max-w-[480px] rounded-lg border bg-card p-6 shadow-xl"
        onClick={(e) => e.stopPropagation()}
        tabIndex={-1}
      >
        {/* Header */}
        <div className="mb-4 flex items-center justify-between">
          <h2 className="text-lg font-semibold text-foreground">
            {t('catalogTitle')}
          </h2>
          <button
            onClick={onClose}
            className="rounded-md p-1 text-muted-foreground transition-colors hover:bg-muted hover:text-foreground"
            aria-label="Close"
          >
            <svg
              xmlns="http://www.w3.org/2000/svg"
              width="20"
              height="20"
              viewBox="0 0 24 24"
              fill="none"
              stroke="currentColor"
              strokeWidth="2"
              strokeLinecap="round"
              strokeLinejoin="round"
            >
              <line x1="18" y1="6" x2="6" y2="18" />
              <line x1="6" y1="6" x2="18" y2="18" />
            </svg>
          </button>
        </div>

        {/* 2x2 grid of widget type cards */}
        <div className="grid grid-cols-2 gap-3">
          {WIDGET_TYPES.map((type) => {
            const def = WIDGET_REGISTRY[type];
            const Icon = def.icon;
            return (
              <button
                key={type}
                onClick={() => {
                  onAddWidget(type);
                  onClose();
                }}
                className="flex flex-col items-center gap-2 rounded-lg border bg-card p-4 text-center transition-colors hover:border-primary hover:bg-muted"
                aria-label={t(def.nameKey)}
              >
                <div className="flex h-14 w-14 items-center justify-center rounded-lg bg-muted">
                  <Icon className="h-6 w-6 text-muted-foreground" />
                </div>
                <span className="text-sm font-semibold text-foreground">
                  {t(def.nameKey)}
                </span>
                <span className="text-xs text-muted-foreground">
                  {t(def.descriptionKey)}
                </span>
              </button>
            );
          })}
        </div>
      </div>
    </div>
  );
}