import type { JellyItem } from './shared';
import { Link, NavLink, useSearchParams } from 'react-router';
import { Clapperboard, Film, FolderOpen, Home, Images, ListVideo, Plug, Search, Tv } from 'lucide-react';
import { jellyfinSectionPath, VIEW_PARAM } from './shared';
import { ServerSwitcher } from './ServerSwitcher';
import { useJellyfinViews } from './useJellyfinData';

// Left panel of the /jellyfin workspace: Home and Search, the libraries the server actually has, then the
// connection screen.
//
// The libraries are not a fixed vocabulary, so they cannot be sections in the path — they are
// /jellyfin/library?view=<id>. That keeps the section list closed (four entries, checked by a type guard)
// while the thing being browsed stays addressable, which is the same split the photos app uses for albums.
//
// Their active state is computed rather than taken from NavLink, because every library link shares the path
// /jellyfin/library and react-router's isActive does not look at the query string.

const ICON_FOR_COLLECTION: Record<string, typeof Film> = {
  movies: Film,
  tvshows: Tv,
  homevideos: Images,
  musicvideos: Clapperboard,
  boxsets: FolderOpen,
  playlists: ListVideo,
};

const ROW = 'group relative flex items-center gap-3 rounded-lg px-3 py-2 text-left text-sm transition-colors';
const ACTIVE = 'bg-primary/10 font-medium text-primary';
const IDLE = 'text-muted-foreground hover:bg-muted hover:text-foreground';

const Marker = () => <span className="absolute left-0 top-1/2 h-5 w-1 -translate-y-1/2 rounded-r-full bg-primary" />;

export const JellyfinNav = () => {
  const { data } = useJellyfinViews();
  const [params] = useSearchParams();
  const activeView = params.get(VIEW_PARAM);

  const views = data?.views ?? [];

  const sectionLink = (id: 'home' | 'search' | 'settings', label: string, Icon: typeof Film) => (
    <NavLink key={id} to={jellyfinSectionPath(id)} className={({ isActive }) => `${ROW} ${isActive ? ACTIVE : IDLE}`}>
      {({ isActive }) => (
        <>
          {isActive && <Marker />}
          <Icon
            className={`h-4 w-4 shrink-0 ${isActive ? 'text-primary' : 'text-muted-foreground group-hover:text-foreground'}`}
          />
          {label}
        </>
      )}
    </NavLink>
  );

  const libraryLink = (view: JellyItem) => {
    const Icon = ICON_FOR_COLLECTION[view.CollectionType ?? ''] ?? FolderOpen;
    const isActive = activeView === view.Id;
    return (
      <Link
        key={view.Id}
        to={`${jellyfinSectionPath('library')}?${VIEW_PARAM}=${encodeURIComponent(view.Id)}`}
        className={`${ROW} ${isActive ? ACTIVE : IDLE}`}
      >
        {isActive && <Marker />}
        <Icon
          className={`h-4 w-4 shrink-0 ${isActive ? 'text-primary' : 'text-muted-foreground group-hover:text-foreground'}`}
        />
        <span className="truncate">{view.Name ?? 'Library'}</span>
      </Link>
    );
  };

  return (
    <div className="flex h-full flex-col overflow-y-auto bg-muted/30">
      <div className="flex items-center gap-3 px-4 py-4">
        <div className="flex h-9 w-9 items-center justify-center rounded-xl bg-primary/15 text-primary ring-1 ring-black/5">
          <Clapperboard className="h-5 w-5" />
        </div>
        <div className="min-w-0">
          <div className="truncate text-sm font-semibold leading-tight">Video</div>
          <ServerSwitcher />
        </div>
      </div>

      <nav className="flex flex-col gap-0.5 px-2">
        {sectionLink('home', 'Home', Home)}
        {sectionLink('search', 'Search', Search)}
      </nav>

      {views.length > 0 && (
        <>
          <div className="mx-4 my-2 border-t" />
          <p className="px-4 pb-1 text-[11px] font-medium uppercase tracking-wide text-muted-foreground">Libraries</p>
          <nav className="flex flex-col gap-0.5 px-2">{views.map(libraryLink)}</nav>
        </>
      )}

      <div className="flex-1" />

      <div className="mx-4 my-2 border-t" />
      <nav className="flex flex-col gap-0.5 px-2 pb-3">{sectionLink('settings', 'Connection', Plug)}</nav>
    </div>
  );
};