import {
  CalendarDays,
  Check,
  Laptop,
  LogOut,
  Menu,
  Moon,
  Settings,
  Sun,
  User,
  X,
} from 'lucide-react';
import { useEffect, useMemo, useRef, useState } from 'react';

import PlayzerIcon from '@/assets/playzer-favicon-512-transparent.png';
import { useQuery, useQueryClient } from '@tanstack/react-query';
import { Link, useLocation, useNavigate } from '@tanstack/react-router';

import { Button } from '@/components/ui/button';
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuLabel,
  DropdownMenuRadioGroup,
  DropdownMenuRadioItem,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu';
import { Sheet, SheetContent, SheetTrigger } from '@/components/ui/sheet';
import { UserAvatar } from '@/components/user-avatar';
import { apiClient } from '@/lib/api-client';
import { useAuth } from '@/lib/auth';
import { acceptStoredPendingInvite } from '@/lib/invitations';
import { useCurrentComplexStore } from '@/lib/stores/current-complex-store';
import { useTheme } from '@/lib/theme';

interface NavItemProps {
  to: '/' | '/about';
  label: string;
  isMobile?: boolean;
  onClick?: () => void;
}

function NavItem({ to, label, isMobile, onClick }: NavItemProps) {
  const location = useLocation();
  const currentPath = location.pathname;
  const isActive = to === '/' ? currentPath === '/' : currentPath.startsWith(to);

  return (
    <Link to={to} onClick={onClick}>
      <Button
        variant="ghost"
        size={isMobile ? 'default' : 'sm'}
        className={[
          'rounded-none transition-all duration-200 hover:bg-transparent',
          'focus-visible:ring-2 focus-visible:ring-primary/50',
          isMobile && 'w-full justify-start rounded-2xl',
          isActive
            ? 'text-primary relative after:absolute after:bottom-0 after:left-0 after:right-0 after:h-0.5 after:bg-primary'
            : 'text-muted-foreground hover:text-foreground relative hover:after:absolute hover:after:bottom-0 hover:after:left-0 hover:after:right-0 hover:after:h-0.5 hover:after:bg-primary/50',
        ]
          .filter(Boolean)
          .join(' ')}
      >
        {label}
      </Button>
    </Link>
  );
}

export function Header() {
  const [open, setOpen] = useState(false);
  const navigate = useNavigate();
  const queryClient = useQueryClient();
  const { user, isAuthenticated, displayName, avatarUrl, signOut } = useAuth();
  const { theme, setTheme } = useTheme();
  const { currentComplexSlug, setCurrentComplex } = useCurrentComplexStore();
  const processedInviteForUser = useRef<string | null>(null);
  const myComplexesQuery = useQuery({
    queryKey: ['my-complexes'],
    enabled: isAuthenticated,
    queryFn: () => apiClient.complexes.listMine(),
  });

  useEffect(() => {
    if (!isAuthenticated) {
      processedInviteForUser.current = null;
      return;
    }

    const userKey = user?.email ?? displayName ?? 'authenticated-user';

    if (processedInviteForUser.current === userKey) {
      return;
    }

    processedInviteForUser.current = userKey;

    void (async () => {
      await acceptStoredPendingInvite(apiClient.complexes.acceptPendingInvitations);
      await queryClient.invalidateQueries({ queryKey: ['my-complexes'] });
    })();
  }, [displayName, isAuthenticated, queryClient, user?.email]);

  const complexSlug = currentComplexSlug || myComplexesQuery.data?.[0]?.complexSlug;
  const currentComplexName = useMemo(() => {
    const complexes = myComplexesQuery.data ?? [];
    if (complexes.length === 0) return 'Mi complejo';

    const selected = complexes.find((complex) => complex.complexSlug === complexSlug);

    return selected?.complexName ?? complexes[0]?.complexName ?? 'Mi complejo';
  }, [complexSlug, myComplexesQuery.data]);

  const menuItems = [
    { label: 'Inicio', to: '/' },
    { label: 'About', to: '/about' },
  ] as const;

  const handleSelectComplex = async (complexId: string, nextSlug: string) => {
    await apiClient.complexes.select({ complexId });
    setCurrentComplex(nextSlug);
    await queryClient.invalidateQueries({ queryKey: ['current-complex'] });
  };

  const handleSignOut = async () => {
    await signOut();
    await navigate({ to: '/login' });
  };

  const handleOpenBookingCreate = async () => {
    if (location.pathname !== '/') {
      await navigate({ to: '/' });
    }

    window.setTimeout(() => {
      window.dispatchEvent(new Event('playzer:open-booking-create'));
    }, 0);
  };

  return (
    <header className="sticky top-0 z-50 w-full border-b border-border/60 bg-background/60 dark:border-primary/20 dark:bg-[#030a10]/90 backdrop-blur-xl">
      <div className="absolute inset-0 -z-10 bg-gradient-to-b from-background/85 to-background/45 dark:from-[#030a10]/95 dark:to-[#030a10]/70" />

      <div className="mx-auto flex h-16 w-full max-w-7xl items-center gap-4 px-3 sm:px-6 lg:px-8">
        <Link to="/" className="group flex items-center gap-3">
          <div className="flex size-10 items-center justify-center  shadow-primary/10 ">
            <img src={PlayzerIcon} alt="Playzer" className="size-7" />
          </div>

          <span className="bg-gradient-to-r from-primary via-primary to-reserved bg-clip-text text-xl font-bold tracking-tight text-transparent">
            Playzer
          </span>
        </Link>

        <nav className="hidden absolute left-1/2 -translate-x-1/2 items-center gap-1 md:flex">
          {menuItems.map((item) => (
            <NavItem key={item.label} to={item.to} label={item.label} />
          ))}
        </nav>

        <div className="flex-1" />

        <div className="hidden items-center gap-2 md:flex">
          <Button
            className="rounded-2xl px-5 shadow-lg shadow-primary/20"
            onClick={() => {
              void handleOpenBookingCreate();
            }}
          >
            <CalendarDays className="mr-2 size-4" />
            Reservar ahora
          </Button>
        </div>

        {isAuthenticated ? (
          <DropdownMenu>
            <DropdownMenuTrigger asChild>
              <button
                type="button"
                className="hidden size-10 rounded-full ring-2 ring-transparent transition-all duration-200 hover:ring-primary/30 focus:outline-none md:flex"
              >
                <UserAvatar
                  src={avatarUrl}
                  alt={displayName}
                  fallbackText={displayName}
                  className="size-10 border border-border/60 shadow-lg shadow-black/10"
                />
              </button>
            </DropdownMenuTrigger>

            <DropdownMenuContent
              align="end"
              className="w-64 rounded-2xl border-border/60 bg-popover/95 p-2 shadow-xl shadow-black/20 backdrop-blur-xl"
            >
              <DropdownMenuLabel className="px-2 py-2">
                <div className="flex items-center gap-3">
                  <UserAvatar
                    src={avatarUrl}
                    alt={displayName}
                    fallbackText={displayName}
                    className="size-9"
                  />

                  <div className="flex min-w-0 flex-col">
                    <span className="truncate text-sm font-medium">{displayName}</span>
                    <span className="truncate text-xs text-muted-foreground">{user?.email}</span>
                    <span className="truncate text-xs text-muted-foreground">
                      {currentComplexName}
                    </span>
                  </div>
                </div>
              </DropdownMenuLabel>

              <DropdownMenuSeparator />

              {myComplexesQuery.data && myComplexesQuery.data.length > 1 && (
                <>
                  <DropdownMenuLabel className="px-2 text-xs font-normal text-muted-foreground">
                    Cambiar complejo
                  </DropdownMenuLabel>
                  {myComplexesQuery.data.map((complex) => (
                    <DropdownMenuItem
                      key={complex.id}
                      className="cursor-pointer rounded-xl"
                      onSelect={() => {
                        void handleSelectComplex(complex.id, complex.complexSlug);
                      }}
                    >
                      <span className="mr-2 flex size-4 items-center justify-center">
                        {complex.complexSlug === complexSlug && <Check className="size-4" />}
                      </span>
                      {complex.complexName}
                    </DropdownMenuItem>
                  ))}
                  <DropdownMenuSeparator />
                </>
              )}

              <DropdownMenuLabel className="px-2 text-xs font-normal text-muted-foreground">
                Apariencia
              </DropdownMenuLabel>
              <DropdownMenuRadioGroup
                value={theme}
                onValueChange={(value) => setTheme(value as 'light' | 'dark' | 'system')}
              >
                <DropdownMenuRadioItem value="light" className="cursor-pointer rounded-xl">
                  <Sun className="mr-2 size-4" />
                  Light
                </DropdownMenuRadioItem>
                <DropdownMenuRadioItem value="dark" className="cursor-pointer rounded-xl">
                  <Moon className="mr-2 size-4" />
                  Dark
                </DropdownMenuRadioItem>
                <DropdownMenuRadioItem value="system" className="cursor-pointer rounded-xl">
                  <Laptop className="mr-2 size-4" />
                  System
                </DropdownMenuRadioItem>
              </DropdownMenuRadioGroup>

              <DropdownMenuSeparator />

              <DropdownMenuItem
                className="cursor-pointer rounded-xl"
                onSelect={() => {
                  void navigate({ to: '/profile' });
                }}
              >
                <User className="mr-2 size-4" />
                Mi Perfil
              </DropdownMenuItem>

              {currentComplexSlug && (
                <DropdownMenuItem
                  className="cursor-pointer rounded-xl"
                  onSelect={() => {
                    void navigate({
                      to: '/complex/$slug/edit',
                      params: { slug: currentComplexSlug },
                    });
                  }}
                >
                  <Settings className="mr-2 size-4" />
                  Configuración
                </DropdownMenuItem>
              )}

              <DropdownMenuSeparator />

              <DropdownMenuItem
                className="cursor-pointer rounded-xl text-destructive focus:bg-destructive/10 focus:text-destructive"
                onSelect={() => {
                  void handleSignOut();
                }}
              >
                <LogOut className="mr-2 size-4" />
                Cerrar sesión
              </DropdownMenuItem>
            </DropdownMenuContent>
          </DropdownMenu>
        ) : (
          <Button asChild size="sm" variant="outline" className="hidden rounded-2xl md:inline-flex">
            <Link to="/login">Login</Link>
          </Button>
        )}

        <Sheet open={open} onOpenChange={setOpen}>
          <SheetTrigger asChild>
            <Button variant="outline" size="icon" className="rounded-2xl md:hidden">
              {open ? <X className="size-5" /> : <Menu className="size-5" />}
            </Button>
          </SheetTrigger>

          <SheetContent
            side="right"
            className="w-[88vw] border-border/60 bg-background/95 p-5 backdrop-blur-xl sm:max-w-sm"
          >
            <div className="mt-6 flex flex-col gap-6">
              <div className="rounded-3xl border border-border/60 bg-card/70 p-4 shadow-xl shadow-black/10">
                <div className="flex items-center gap-3">
                  <UserAvatar
                    src={avatarUrl}
                    alt={displayName}
                    fallbackText={displayName}
                    className="size-11"
                  />

                  <div className="min-w-0">
                    <p className="truncate text-sm font-medium">{displayName}</p>
                    <p className="truncate text-xs text-muted-foreground">{user?.email}</p>
                    {isAuthenticated && (
                      <p className="truncate text-xs text-muted-foreground">{currentComplexName}</p>
                    )}
                  </div>
                </div>
              </div>

              <nav className="flex flex-col gap-1">
                {menuItems.map((item) => (
                  <NavItem
                    key={item.label}
                    to={item.to}
                    label={item.label}
                    isMobile
                    onClick={() => setOpen(false)}
                  />
                ))}
              </nav>

              <Button
                className="rounded-2xl shadow-lg shadow-primary/20"
                onClick={() => {
                  setOpen(false);
                  void handleOpenBookingCreate();
                }}
              >
                <CalendarDays className="mr-2 size-4" />
                Reservar ahora
              </Button>

              <div className="border-t border-border/60 pt-4">
                <div className="mb-2 flex items-center justify-between px-2">
                  <p className="text-xs font-medium uppercase tracking-wider text-muted-foreground">
                    Cuenta
                  </p>
                </div>

                <nav className="flex flex-col gap-1">
                  {!isAuthenticated && (
                    <Button
                      variant="ghost"
                      className="justify-start rounded-2xl"
                      onClick={() => {
                        setOpen(false);
                        void navigate({ to: '/login' });
                      }}
                    >
                      Login
                    </Button>
                  )}

                  <div className="py-1">
                    <p className="px-3 py-1 text-xs text-muted-foreground">Apariencia</p>
                    {[
                      { value: 'light', label: 'Light', icon: Sun },
                      { value: 'dark', label: 'Dark', icon: Moon },
                      { value: 'system', label: 'System', icon: Laptop },
                    ].map((item) => {
                      const Icon = item.icon;

                      return (
                        <Button
                          key={item.value}
                          variant="ghost"
                          className="w-full justify-start rounded-2xl"
                          onClick={() => setTheme(item.value as 'light' | 'dark' | 'system')}
                        >
                          <span className="mr-2 flex size-4 items-center justify-center">
                            {theme === item.value ? (
                              <Check className="size-4" />
                            ) : (
                              <Icon className="size-4" />
                            )}
                          </span>
                          {item.label}
                        </Button>
                      );
                    })}
                  </div>

                  {myComplexesQuery.data && myComplexesQuery.data.length > 1 && (
                    <div className="py-1">
                      <p className="px-3 py-1 text-xs text-muted-foreground">Cambiar complejo</p>
                      {myComplexesQuery.data.map((complex) => (
                        <Button
                          key={complex.id}
                          variant="ghost"
                          className="w-full justify-start rounded-2xl"
                          onClick={() => {
                            setOpen(false);
                            void handleSelectComplex(complex.id, complex.complexSlug);
                          }}
                        >
                          <span className="mr-2 flex size-4 items-center justify-center">
                            {complex.complexSlug === complexSlug && <Check className="size-4" />}
                          </span>
                          {complex.complexName}
                        </Button>
                      ))}
                    </div>
                  )}

                  {isAuthenticated && (
                    <Button
                      variant="ghost"
                      className="justify-start rounded-2xl"
                      onClick={() => {
                        setOpen(false);
                        void navigate({ to: '/profile' });
                      }}
                    >
                      <User className="mr-2 size-4" />
                      Mi Perfil
                    </Button>
                  )}

                  {currentComplexSlug && (
                    <Button
                      variant="ghost"
                      className="justify-start rounded-2xl"
                      onClick={() => {
                        setOpen(false);
                        void navigate({
                          to: '/complex/$slug/edit',
                          params: { slug: currentComplexSlug },
                        });
                      }}
                    >
                      <Settings className="mr-2 size-4" />
                      Configuración
                    </Button>
                  )}

                  {isAuthenticated && (
                    <Button
                      variant="ghost"
                      className="justify-start rounded-2xl text-destructive hover:bg-destructive/10 hover:text-destructive"
                      onClick={() => {
                        setOpen(false);
                        void handleSignOut();
                      }}
                    >
                      <LogOut className="mr-2 size-4" />
                      Cerrar sesión
                    </Button>
                  )}
                </nav>
              </div>
            </div>
          </SheetContent>
        </Sheet>
      </div>

      <div className="h-px bg-gradient-to-r from-transparent via-primary/40 to-transparent" />
    </header>
  );
}