'use client';

import Link from 'next/link';
import { usePathname } from 'next/navigation';
import { cn } from '@/lib/utils';
import { useSidebarStore } from '@/lib/stores/use-sidebar-store';
import {
  LayoutDashboard,
  ListTodo,
  Flame,
  FolderKanban,
  NotebookPen,
  BookOpen,
  Share2,
  LayoutGrid,
  CalendarDays,
  Search,
  Bot,
  Settings,
  ChevronLeft,
  ChevronRight,
} from 'lucide-react';
import { Button } from '@/components/ui/button';
import { ScrollArea } from '@/components/ui/scroll-area';
import { Separator } from '@/components/ui/separator';
import {
  Tooltip,
  TooltipContent,
  TooltipProvider,
  TooltipTrigger,
} from '@/components/ui/tooltip';
import {
  Sheet,
  SheetContent,
  SheetDescription,
  SheetHeader,
  SheetTitle,
} from '@/components/ui/sheet';

const navItems = [
  { href: '/dashboard', label: 'Dashboard', icon: LayoutDashboard },
  { href: '/tasks', label: 'Tasks', icon: ListTodo },
  { href: '/habits', label: 'Habits', icon: Flame },
  { href: '/projects', label: 'Projects', icon: FolderKanban },
  { href: '/notes', label: 'Notes', icon: NotebookPen },
  { href: '/daily-notes', label: 'Daily Note', icon: BookOpen },
  { href: '/graph', label: 'Graph', icon: Share2 },
  { href: '/canvas', label: 'Canvas', icon: LayoutGrid },
  { href: '/calendar', label: 'Calendar', icon: CalendarDays },
  { href: '/search', label: 'Search', icon: Search },
];

const workspaceItems = [
  { href: '/agents', label: 'Agent Activity', icon: Bot },
  { href: '/settings', label: 'Settings', icon: Settings },
];

export function Sidebar() {
  const pathname = usePathname();
  const { collapsed, toggle, mobileOpen, setMobileOpen } = useSidebarStore();

  const navigation = (isCollapsed: boolean, onNavigate?: () => void) => (
    <ScrollArea className="flex-1 py-2">
      <nav className="flex flex-col gap-1 px-2" aria-label="Primary">
        {navItems.map((item) => {
          const isActive = pathname === item.href || pathname.startsWith(item.href + '/');
          const link = (
            <Link
              key={item.href}
              href={item.href}
              onClick={onNavigate}
              className={cn(
                'flex items-center gap-3 rounded-lg px-3 py-2 text-sm font-medium transition-colors',
                isActive
                  ? 'bg-accent text-accent-foreground'
                  : 'text-muted-foreground hover:bg-accent hover:text-accent-foreground'
              )}
              aria-current={isActive ? 'page' : undefined}
            >
              <item.icon className="h-4 w-4 shrink-0" aria-hidden="true" />
              {!isCollapsed && <span>{item.label}</span>}
            </Link>
          );
          if (isCollapsed) {
            return (
              <Tooltip key={item.href}>
                <TooltipTrigger asChild>{link}</TooltipTrigger>
                <TooltipContent side="right">{item.label}</TooltipContent>
              </Tooltip>
            );
          }

          return link;
        })}
      </nav>
      <Separator className="my-3" />
      <nav className="flex flex-col gap-1 px-2" aria-label="Workspace">
        {!isCollapsed && (
          <p className="px-3 text-xs font-semibold uppercase tracking-wider text-muted-foreground">
            Workspace
          </p>
        )}
        {workspaceItems.map((item) => {
          const isActive = pathname === item.href || pathname.startsWith(item.href + '/');
          const link = (
            <Link
              key={item.href}
              href={item.href}
              onClick={onNavigate}
              className={cn(
                'flex items-center gap-3 rounded-lg px-3 py-2 text-sm font-medium transition-colors',
                isActive
                  ? 'bg-accent text-accent-foreground'
                  : 'text-muted-foreground hover:bg-accent hover:text-accent-foreground'
              )}
              aria-current={isActive ? 'page' : undefined}
            >
              <item.icon className="h-4 w-4 shrink-0" aria-hidden="true" />
              {!isCollapsed && <span>{item.label}</span>}
            </Link>
          );
          if (isCollapsed) {
            return (
              <Tooltip key={item.href}>
                <TooltipTrigger asChild>{link}</TooltipTrigger>
                <TooltipContent side="right">{item.label}</TooltipContent>
              </Tooltip>
            );
          }

          return link;
        })}
      </nav>
    </ScrollArea>
  );

  return (
    <TooltipProvider delayDuration={0}>
      <aside
        className={cn(
          'hidden flex-col border-r bg-card transition-all duration-200 md:flex',
          collapsed ? 'w-16' : 'w-60'
        )}
        aria-label="Main navigation"
      >
        {/* Logo */}
        <div className="flex h-14 items-center justify-between px-4">
          {!collapsed && (
            <Link href="/dashboard" className="flex items-center gap-2 font-semibold">
              <span className="flex h-7 w-7 items-center justify-center rounded-lg bg-primary text-primary-foreground text-sm font-bold">
                E
              </span>
              Project E
            </Link>
          )}
          <Button
            variant="ghost"
            size="icon"
            className="h-11 w-11 shrink-0"
            onClick={toggle}
            aria-label={collapsed ? 'Expand sidebar' : 'Collapse sidebar'}
          >
            {collapsed ? <ChevronRight className="h-4 w-4" aria-hidden="true" /> : <ChevronLeft className="h-4 w-4" aria-hidden="true" />}
          </Button>
        </div>

        <Separator />

        {navigation(collapsed)}
      </aside>
      <Sheet open={mobileOpen} onOpenChange={setMobileOpen}>
        <SheetContent side="left" className="flex w-72 flex-col p-0 md:hidden">
          <SheetHeader className="border-b px-4 py-4 pr-12">
            <SheetTitle>Project E</SheetTitle>
            <SheetDescription>Navigate your workspace.</SheetDescription>
          </SheetHeader>
          {navigation(false, () => setMobileOpen(false))}
        </SheetContent>
      </Sheet>
    </TooltipProvider>
  );
}