import type { FC } from 'react';
import { useEffect, useRef, useState } from 'react';
import { Link, useLocation } from 'react-router-dom';
import { List, PanelRight, PanelBottom, Settings2 } from 'lucide-react';
import { useQuickLinks, QUICK_LINKS_MODE_LABELS, type QuickLinksMode } from '../lib/quicklinks';

interface DockItem {
  label: string;
  href: string;
  icon: FC<{ size?: number | string; className?: string }>;
}

interface QuickLinksDockProps {
  /** Items visibles del menú (para resolver icono/label de cada href fijado) */
  items: DockItem[];
}

const MODE_ICONS: Record<QuickLinksMode, FC<{ size?: number | string; className?: string }>> = {
  menu: List,
  right: PanelRight,
  bottom: PanelBottom,
};

/** Selector de presentación de los accesos rápidos (menú / derecha / abajo). */
export const QuickLinksModePicker: FC<{ direction?: 'up' | 'down'; align?: 'left' | 'right' }> = ({
  direction = 'up',
  align = 'right',
}) => {
  const quick = useQuickLinks();
  const [open, setOpen] = useState(false);
  const ref = useRef<HTMLDivElement>(null);

  useEffect(() => {
    if (!open) return;
    const close = (e: MouseEvent) => {
      if (ref.current && !ref.current.contains(e.target as Node)) setOpen(false);
    };
    document.addEventListener('mousedown', close);
    return () => document.removeEventListener('mousedown', close);
  }, [open]);

  return (
    <div ref={ref} className="relative">
      <button
        type="button"
        onClick={() => setOpen(!open)}
        className="flex items-center justify-center w-8 h-8 rounded-xl text-theme-muted hover:bg-theme-accent-bg hover:text-theme-heading transition-colors"
        title="Cambiar presentación de accesos rápidos"
      >
        <Settings2 size={15} />
      </button>
      {open && (
        <div
          className={`absolute z-50 w-56 rounded-2xl border border-theme-border bg-theme-surface shadow-card p-1.5 ${
            direction === 'up' ? 'bottom-full mb-2' : 'top-full mt-2'
          } ${align === 'right' ? 'right-0' : 'left-0'}`}
        >
          <p className="px-2.5 py-1.5 text-[10px] uppercase tracking-wider text-theme-muted font-medium">
            Mostrar accesos rápidos
          </p>
          {(Object.keys(MODE_ICONS) as QuickLinksMode[]).map((m) => {
            const ModeIcon = MODE_ICONS[m];
            const selected = quick.mode === m;
            return (
              <button
                key={m}
                type="button"
                onClick={() => { quick.setMode(m); setOpen(false); }}
                className={`w-full flex items-center gap-2.5 px-2.5 py-2 rounded-xl text-sm transition-colors ${
                  selected ? 'bg-theme-accent-bg text-theme-heading font-medium' : 'text-theme-muted hover:bg-theme-bg hover:text-theme-heading'
                }`}
              >
                <ModeIcon size={15} />
                {QUICK_LINKS_MODE_LABELS[m]}
                {selected && <span className="ml-auto text-brand-coral">●</span>}
              </button>
            );
          })}
        </div>
      )}
    </div>
  );
};

/**
 * Barra flotante de accesos rápidos (iconos), a la derecha o abajo según
 * la preferencia del usuario. En modo 'menu' no se muestra (la sección
 * va dentro del sidebar de cada layout).
 */
export const QuickLinksDock: FC<QuickLinksDockProps> = ({ items }) => {
  const location = useLocation();
  const quick = useQuickLinks();

  if (quick.mode === 'menu') return null;

  const dockItems = quick.links
    .map((href) => items.find((it) => it.href === href))
    .filter((it): it is DockItem => it !== undefined);

  const isActive = (href: string) =>
    href === '/' ? location.pathname === '/' : location.pathname === href || location.pathname.startsWith(`${href}/`);

  const isRight = quick.mode === 'right';

  return (
    <nav
      aria-label="Accesos rápidos"
      className={
        isRight
          ? 'fixed right-0 top-1/2 -translate-y-1/2 z-40 hidden lg:flex flex-col items-center gap-1 py-2 px-1.5 mr-2 rounded-2xl border border-theme-border bg-theme-surface shadow-card'
          : 'fixed bottom-3 left-1/2 -translate-x-1/2 z-40 flex items-center gap-1 px-2 py-1.5 rounded-2xl border border-theme-border bg-theme-surface shadow-card'
      }
    >
      {dockItems.length === 0 && (
        <span className={`text-[11px] text-theme-muted px-2 ${isRight ? 'py-2 [writing-mode:vertical-rl]' : ''}`}>
          Fija accesos con la ★ del menú
        </span>
      )}
      {dockItems.map((item) => {
        const Icon = item.icon;
        const active = isActive(item.href);
        return (
          <Link
            key={item.href}
            to={item.href}
            title={item.label}
            aria-label={item.label}
            className={`flex items-center justify-center w-10 h-10 rounded-xl transition-colors ${
              active
                ? 'bg-theme-accent text-theme-inverse shadow-soft'
                : 'text-theme-muted hover:bg-theme-accent-bg hover:text-theme-heading'
            }`}
          >
            <Icon size={18} />
          </Link>
        );
      })}
      <div className={isRight ? 'border-t border-theme-border pt-1 mt-1' : 'border-l border-theme-border pl-1 ml-1'}>
        <QuickLinksModePicker direction={isRight ? 'down' : 'up'} align="right" />
      </div>
    </nav>
  );
};

export default QuickLinksDock;