"use client";

import { useMemo, useState } from "react";
import {
  ChevronDown,
  FileText,
  FolderKanban,
  Home,
  LayoutGrid,
  Presentation,
  Search,
  Settings,
  Star,
} from "lucide-react";
import { useParams, usePathname } from "next/navigation";

import { cn } from "@/lib/utils";
import { Button } from "@/components/ui/button";
import { ScrollArea } from "@/components/ui/scroll-area";
import { Separator } from "@/components/ui/separator";
import { useWorkspaceStore } from "@/lib/stores/workspace-store";

import { SidebarItem } from "./sidebar-item";

const PROJECT_DOTS = [
  "hsl(var(--primary))",
  "hsl(var(--teal))",
  "hsl(38 92% 50%)",
  "hsl(199 89% 48%)",
];

function NavSectionLabel({
  children,
  collapsed,
}: {
  children: React.ReactNode;
  collapsed?: boolean;
}) {
  if (collapsed) return null;
  return (
    <div className="px-2 pb-1 pt-3 text-[10px] font-semibold uppercase tracking-wider text-muted-foreground first:pt-1">
      {children}
    </div>
  );
}

export function SidebarNav({
  collapsed,
  onOpenSearch,
}: {
  collapsed: boolean;
  onOpenSearch?: () => void;
}) {
  const pathname = usePathname();
  const params = useParams();
  const workspace = useWorkspaceStore((s) => s.currentWorkspace);
  const slugParam =
    typeof params?.workspaceSlug === "string" ? params.workspaceSlug : "";
  const base = workspace?.slug
    ? `/${workspace.slug}`
    : slugParam
      ? `/${slugParam}`
      : "";

  const [favoritesOpen, setFavoritesOpen] = useState(true);
  const [projectsOpen, setProjectsOpen] = useState(true);

  const homeActive = pathname === base || pathname === `${base}/`;

  const favoriteItems = useMemo(
    () => [
      { label: "Q1 Launch", href: `${base}/favorites/q1` },
      { label: "Design system", href: `${base}/favorites/design` },
    ],
    [base],
  );

  const projectItems = useMemo(
    () => [
      { label: "Product roadmap", slug: "product-roadmap" },
      { label: "Marketing", slug: "marketing" },
      { label: "Engineering", slug: "engineering" },
      { label: "Operations", slug: "operations" },
    ],
    [base],
  );

  return (
    <ScrollArea className="flex-1">
      <nav className="flex flex-col gap-0.5 px-2 pb-4 pt-1">
        <SidebarItem
          href={onOpenSearch ? "#" : `${base}/search`}
          icon={<Search />}
          label="Search"
          collapsed={collapsed}
          active={pathname.startsWith(`${base}/search`)}
          onClick={
            onOpenSearch
              ? (e) => {
                  e.preventDefault();
                  onOpenSearch();
                }
              : undefined
          }
        />

        <Separator className="my-2 bg-sidebar-border" />

        <SidebarItem
          href={base || "/"}
          icon={<Home />}
          label="Home"
          collapsed={collapsed}
          active={homeActive}
        />

        <div>
          <Button
            type="button"
            variant="ghost"
            className={cn(
              "mb-0.5 flex h-8 w-full items-center justify-between rounded-md px-2 text-[10px] font-semibold uppercase tracking-wider text-muted-foreground hover:bg-sidebar-accent hover:text-sidebar-accent-foreground",
              collapsed && "justify-center px-0",
            )}
            onClick={() => setFavoritesOpen((o) => !o)}
          >
            {!collapsed ? (
              <>
                <span className="flex items-center gap-1.5">
                  <Star className="size-3.5" />
                  Favorites
                </span>
                <ChevronDown
                  className={cn(
                    "size-3.5 shrink-0 transition-transform duration-200",
                    !favoritesOpen && "-rotate-90",
                  )}
                />
              </>
            ) : (
              <Star className="size-4 text-muted-foreground" />
            )}
          </Button>
          {favoritesOpen || collapsed
            ? favoriteItems.map((fav) => (
                <SidebarItem
                  key={fav.href}
                  href={fav.href}
                  icon={<Star className="size-[15px]" />}
                  label={fav.label}
                  collapsed={collapsed}
                  active={pathname === fav.href}
                />
              ))
            : null}
        </div>

        <div>
          <Button
            type="button"
            variant="ghost"
            className={cn(
              "mb-0.5 flex h-8 w-full items-center justify-between rounded-md px-2 text-[10px] font-semibold uppercase tracking-wider text-muted-foreground hover:bg-sidebar-accent hover:text-sidebar-accent-foreground",
              collapsed && "justify-center px-0",
            )}
            onClick={() => setProjectsOpen((o) => !o)}
          >
            {!collapsed ? (
              <>
                <span className="flex items-center gap-1.5">
                  <FolderKanban className="size-3.5" />
                  Projects
                </span>
                <ChevronDown
                  className={cn(
                    "size-3.5 shrink-0 transition-transform duration-200",
                    !projectsOpen && "-rotate-90",
                  )}
                />
              </>
            ) : (
              <FolderKanban className="size-4 text-muted-foreground" />
            )}
          </Button>
          {projectsOpen || collapsed
            ? projectItems.map((p, i) => (
                <SidebarItem
                  key={p.slug}
                  href={`${base}/projects/${p.slug}`}
                  icon={<LayoutGrid className="size-[15px]" />}
                  label={p.label}
                  collapsed={collapsed}
                  active={pathname === `${base}/projects/${p.slug}`}
                  dotColor={PROJECT_DOTS[i % PROJECT_DOTS.length]}
                />
              ))
            : null}
        </div>

        <NavSectionLabel collapsed={collapsed}>Content</NavSectionLabel>
        <SidebarItem
          href={`${base}/documents`}
          icon={<FileText />}
          label="Documents"
          collapsed={collapsed}
          active={pathname.startsWith(`${base}/documents`)}
        />
        <SidebarItem
          href={`${base}/whiteboards`}
          icon={<Presentation />}
          label="Whiteboards"
          collapsed={collapsed}
          active={pathname.startsWith(`${base}/whiteboards`)}
        />

        <NavSectionLabel collapsed={collapsed}>Workspace</NavSectionLabel>
        <SidebarItem
          href={`${base}/settings`}
          icon={<Settings />}
          label="Settings"
          collapsed={collapsed}
          active={pathname.startsWith(`${base}/settings`)}
        />
      </nav>
    </ScrollArea>
  );
}