petfeed/src/components/layout/MobileNav.tsx

"use client";

import { useState } from "react";
import Link from "next/link";
import { usePathname, useRouter } from "next/navigation";
import {
  Home,
  Compass,
  Plus,
  User,
  ChevronDown,
  Mail,
  BadgeCheck,
} from "lucide-react";
import { useTranslations } from "next-intl";
import { NotificationBell } from "@/components/notifications/NotificationBell";
import { PostTypeSheet } from "@/components/post-creation/PostTypeSheet";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import { PetAvatar } from "@/components/ui/pet-avatar";
import { Badge } from "@/components/ui/badge";
import { useActivePet } from "@/context/ActivePetContext";

type Pet = {
  id: string;
  name: string;
  avatarKey: string | null;
  isVerified: boolean;
  species: { name: string };
};

type MobileNavProps = {
  pets: Pet[];
};

/**
 * Mobile bottom tab bar — visible below lg: breakpoint.
 *
 * UI-SPEC: Navigation (App Shell) — Mobile
 * - Fixed bottom bar (h-16) with bg-card border-top
 * - 5 tabs: Home, Explore (placeholder), Post (center, orange-500), Notifications (placeholder), Profile
 * - Top active pet switcher dropdown above the tab bar
 *
 * Explore and Notifications are placeholder tabs (aria-disabled) in Phase 1.
 * Post tab (center) links to /pets in Phase 1 — full post creation in Phase 2.
 *
 * Deviation notes:
 * - shadcn base-nova uses @base-ui/react/menu which does not support asChild on
 *   DropdownMenuTrigger or DropdownMenuItem. Using onClick+useRouter for navigation items.
 */
export function MobileNav({ pets }: MobileNavProps) {
  const pathname = usePathname();
  const router = useRouter();
  const { activePetId, setActivePet } = useActivePet();

  const t = useTranslations("Nav");
  const activePet = pets.find((p) => p.id === activePetId) ?? pets[0];
  const [postTypeSheetOpen, setPostTypeSheetOpen] = useState(false);

  // First-load fallback is handled once, centrally, by ActivePetInitializer
  // (mounted alongside Sidebar/MobileNav in the app layout) — don't duplicate it here.

  // D-05: Home → /feed; also highlight when on / (which redirects to /feed)
  const isHomePage = pathname === "/feed" || pathname === "/";
  const isPetsPage = pathname.startsWith("/pets");
  const isExplorePage = pathname.startsWith("/explore");
  const isNotificationsPage = pathname.startsWith("/notifications");
  const isMessagesPage = pathname.startsWith("/messages");

  return (
    <div className="lg:hidden fixed bottom-0 left-0 right-0 z-50">
      {/* Fixed Messages shortcut — top-right corner, always reachable */}
      <Link
        href="/messages"
        aria-label={t("messages")}
        className={`fixed top-3 right-3 z-[51] flex items-center justify-center w-10 h-10 rounded-full bg-background/90 backdrop-blur-sm border border-border shadow-md ${
          isMessagesPage ? "text-orange-500" : "text-foreground/75"
        }`}
      >
        <Mail className="h-5 w-5" aria-hidden="true" />
      </Link>

      {/* Active pet switcher bar — shown above tab bar on mobile */}
      {activePet && (
        <div className="bg-background border-t border px-4 py-2">
          <DropdownMenu>
            <DropdownMenuTrigger
              className="flex items-center gap-2 text-sm cursor-pointer"
              aria-label="Switch active pet"
            >
              <PetAvatar
                name={activePet.name}
                avatarKey={activePet.avatarKey}
                className="h-6 w-6 shrink-0"
              />
              <span className="font-medium text-foreground truncate max-w-[120px] flex items-center gap-1">
                {activePet.name}
                {activePet.isVerified && (
                  <BadgeCheck className="h-3 w-3 shrink-0 fill-blue-500 text-background" />
                )}
              </span>
              <ChevronDown className="h-3 w-3 text-muted-foreground" />
            </DropdownMenuTrigger>
            <DropdownMenuContent align="start" className="w-[200px]">
              {pets.map((pet) => (
                <DropdownMenuItem
                  key={pet.id}
                  onClick={() => setActivePet(pet.id)}
                  className="flex items-center gap-2 cursor-pointer"
                >
                  <PetAvatar
                    name={pet.name}
                    avatarKey={pet.avatarKey}
                    className="h-6 w-6 shrink-0"
                  />
                  <span className="flex-1 text-sm truncate flex items-center gap-1">
                    {pet.name}
                    {pet.isVerified && (
                      <BadgeCheck className="h-3 w-3 shrink-0 fill-blue-500 text-background" />
                    )}
                  </span>
                  <Badge variant="secondary" className="text-xs shrink-0">
                    {pet.species.name}
                  </Badge>
                  {pet.id === activePetId && (
                    <span
                      className="w-2 h-2 rounded-full bg-orange-500 shrink-0"
                      aria-label="Active pet"
                    />
                  )}
                </DropdownMenuItem>
              ))}
              <DropdownMenuSeparator />
              <DropdownMenuItem
                onClick={() => router.push("/onboarding/pet")}
                className="flex items-center gap-2 cursor-pointer"
              >
                <span className="text-orange-500">+</span>
                <span>{t("addPet")}</span>
              </DropdownMenuItem>
            </DropdownMenuContent>
          </DropdownMenu>
        </div>
      )}

      {/* Bottom tab bar — pt-2 + pb handles iOS safe-area (home indicator) */}
      <nav
        className="bg-card border-t flex items-center justify-around px-2 pt-2 pb-[max(8px,env(safe-area-inset-bottom))]"
        style={{ minHeight: "4rem" }}
        aria-label="Mobile navigation"
      >
        {/* Home — D-05: href updated to /feed; label stays "Home" */}
        <Link
          href="/feed"
          className={`flex flex-col items-center gap-0.5 px-3 py-1.5 text-xs font-medium ${
            isHomePage ? "text-orange-500" : "text-foreground/60"
          }`}
        >
          <Home className="h-6 w-6" aria-hidden="true" />
          <span>{t("home")}</span>
        </Link>

        {/* Explore */}
        <Link
          href="/explore"
          className={`flex flex-col items-center gap-0.5 px-3 py-1.5 text-xs font-medium ${
            isExplorePage ? "text-orange-500" : "text-foreground/60"
          }`}
        >
          <Compass className="h-6 w-6" aria-hidden="true" />
          <span>{t("explore")}</span>
        </Link>

        {/* Post — center, accent-filled. D-01: opens PostTypeSheet */}
        <button
          type="button"
          aria-label="Create post"
          onClick={() => setPostTypeSheetOpen(true)}
          className="flex flex-col items-center"
        >
          <span className="bg-orange-500 text-white rounded-full p-3 flex items-center justify-center shadow-sm">
            <Plus className="h-5 w-5" aria-hidden="true" />
          </span>
        </button>

        {/* Notifications — with live unread badge */}
        <NotificationBell variant="mobile" isActive={isNotificationsPage} />

        {/* Profile (My Pets) */}
        <Link
          href="/pets"
          className={`flex flex-col items-center gap-0.5 px-3 py-1.5 text-xs font-medium ${
            isPetsPage ? "text-orange-500" : "text-foreground/60"
          }`}
        >
          <User className="h-6 w-6" aria-hidden="true" />
          <span>{t("profile")}</span>
        </Link>
      </nav>

      {/* PostTypeSheet — D-01: bottom Sheet with Photo/Story/Milestone choices */}
      <PostTypeSheet
        open={postTypeSheetOpen}
        onOpenChange={setPostTypeSheetOpen}
      />
    </div>
  );
}