'use client';
import { X } from 'lucide-react';
import { type ReactNode, useEffect, useRef } from 'react';
import { cn } from '@/lib/cn';

/**
 * Sheet / drawer primitive shared by the event drawer, filter sheets and the mobile "More" menu.
 * `side="auto"` (default): right-side panel ≥ lg, bottom sheet below. Focus trap, Esc, backdrop click, body scroll lock.
 */
export function Sheet({
  open,
  onClose,
  title,
  eyebrow,
  children,
  side = 'auto',
  width = 'lg:w-[30rem]',
  className,
  footer,
  id,
  headerExtra,
}: {
  open: boolean;
  onClose: () => void;
  title?: ReactNode;
  eyebrow?: ReactNode;
  children: ReactNode;
  side?: 'auto' | 'right' | 'bottom';
  width?: string;
  className?: string;
  footer?: ReactNode;
  id?: string;
  headerExtra?: ReactNode;
}) {
  const panel = useRef<HTMLDivElement>(null);
  const closeBtn = useRef<HTMLButtonElement>(null);
  const restore = useRef<HTMLElement | null>(null);

  useEffect(() => {
    if (!open) return;
    restore.current = document.activeElement as HTMLElement | null;
    const prevOverflow = document.body.style.overflow;
    document.body.style.overflow = 'hidden';
    const t = setTimeout(() => closeBtn.current?.focus(), 20);
    const onKey = (e: KeyboardEvent) => {
      if (e.key === 'Escape') {
        e.stopPropagation();
        onClose();
      } else if (e.key === 'Tab' && panel.current) {
        const nodes = panel.current.querySelectorAll<HTMLElement>('a[href], button:not([disabled]), input, select, textarea, [tabindex]:not([tabindex="-1"])');
        if (!nodes.length) return;
        const first = nodes[0] as HTMLElement;
        const last = nodes[nodes.length - 1] as HTMLElement;
        if (e.shiftKey && document.activeElement === first) {
          e.preventDefault();
          last.focus();
        } else if (!e.shiftKey && document.activeElement === last) {
          e.preventDefault();
          first.focus();
        }
      }
    };
    document.addEventListener('keydown', onKey);
    return () => {
      clearTimeout(t);
      document.removeEventListener('keydown', onKey);
      document.body.style.overflow = prevOverflow;
      restore.current?.focus?.();
    };
  }, [open, onClose]);

  if (!open) return null;
  const right = side === 'right';
  return (
    <div className="fixed inset-0 z-[90] flex bg-black/45 backdrop-blur-[1px]" onClick={onClose} role="presentation">
      <div
        ref={panel}
        id={id}
        role="dialog"
        aria-modal="true"
        onClick={(e) => e.stopPropagation()}
        className={cn(
          'sheet-enter panel flex flex-col overflow-hidden shadow-2xl',
          !right && 'absolute inset-x-0 bottom-0 max-h-[88dvh] rounded-b-none rounded-t-lg',
          side === 'auto' && `lg:inset-y-0 lg:right-0 lg:left-auto lg:h-full lg:max-h-none lg:rounded-none lg:border-y-0 lg:border-r-0 ${width} lg:max-w-[92vw]`,
          right && `absolute inset-y-0 right-0 h-full max-w-[92vw] rounded-none border-y-0 border-r-0 ${width}`,
          className,
        )}
      >
        <div className="flex items-start gap-3 border-b border-rule px-4 py-3">
          <div className="min-w-0 flex-1">
            {eyebrow && <p className="eyebrow">{eyebrow}</p>}
            {title && <h2 className="mt-0.5 text-[15px] font-semibold leading-snug text-ink">{title}</h2>}
          </div>
          {headerExtra}
          <button ref={closeBtn} type="button" onClick={onClose} className="-mr-1 flex size-11 shrink-0 items-center justify-center rounded-sm text-ink-3 hover:bg-surface-2 hover:text-ink" aria-label="Close">
            <X className="size-5" aria-hidden />
          </button>
        </div>
        <div className="scrollbar-thin flex-1 overflow-y-auto px-4 py-3">{children}</div>
        {footer && <div className="safe-bottom border-t border-rule px-4 py-3">{footer}</div>}
      </div>
    </div>
  );
}