import { useState } from "react";
import { useTranslation } from "react-i18next";
import {
  BarChart3,
  ChevronLeft,
  ChevronRight,
  Home,
  Info,
  ListVideo,
  LogOut,
  Settings,
  Shield,
  Tv,
} from "lucide-react";
import type { Me } from "../lib/api";
import type { Page } from "../lib/urlState";
import AvatarImg from "./Avatar";

// Primary app navigation: a collapsible left rail with icon+label entries (Design C). The
// modules used to hide under the avatar dropdown; they now live here. Collapsed, it becomes
// a thin icon-only rail. Account actions sit at the bottom in a popover.
export default function NavSidebar({
  me,
  page,
  setPage,
  onOpenAbout,
}: {
  me: Me;
  page: Page;
  setPage: (p: Page) => void;
  onOpenAbout: () => void;
}) {
  const { t } = useTranslation();
  const [collapsed, setCollapsed] = useState<boolean>(
    () => localStorage.getItem("siftlode.navCollapsed") === "1"
  );
  const [acctOpen, setAcctOpen] = useState(false);

  function toggleCollapsed() {
    setCollapsed((c) => {
      const next = !c;
      localStorage.setItem("siftlode.navCollapsed", next ? "1" : "0");
      return next;
    });
  }

  async function logout() {
    await fetch("/auth/logout", { method: "POST", credentials: "include" });
    location.reload();
  }

  const items: { page: Page; icon: typeof Home; label: string }[] = [
    { page: "feed", icon: Home, label: t("header.account.feed") },
    { page: "channels", icon: Tv, label: t("header.account.channels") },
    { page: "playlists", icon: ListVideo, label: t("header.account.playlists") },
  ];
  if (me.role === "admin")
    items.push({ page: "stats", icon: BarChart3, label: t("header.account.stats") });

  const rowBase =
    "w-full flex items-center gap-3 rounded-lg px-2.5 py-2 text-sm transition";
  const name = me.display_name ?? me.email.split("@")[0];

  return (
    <nav
      className={`relative shrink-0 border-r border-border bg-surface/60 flex flex-col py-3 transition-[width] ${
        collapsed ? "w-[56px] px-2" : "w-52 px-3"
      }`}
      aria-label={t("nav.primary")}
    >
      <div className={`flex items-center mb-3 ${collapsed ? "justify-center" : "justify-between"}`}>
        {!collapsed && (
          <button
            onClick={() => setPage("feed")}
            className="text-lg font-bold tracking-tight select-none"
            title={t("header.feed")}
          >
            Sift<span className="text-accent">lode</span>
          </button>
        )}
        <button
          onClick={toggleCollapsed}
          title={collapsed ? t("nav.expand") : t("nav.collapse")}
          aria-label={collapsed ? t("nav.expand") : t("nav.collapse")}
          className="p-1 rounded-md text-muted hover:text-fg hover:bg-card transition"
        >
          {collapsed ? (
            <ChevronRight className="w-4 h-4" />
          ) : (
            <ChevronLeft className="w-4 h-4" />
          )}
        </button>
      </div>

      <div className="flex-1 min-h-0 overflow-y-auto flex flex-col gap-1">
        {items.map(({ page: p, icon: Icon, label }) => (
          <button
            key={p}
            onClick={() => setPage(p)}
            title={collapsed ? label : undefined}
            aria-current={page === p ? "page" : undefined}
            className={`${rowBase} ${collapsed ? "justify-center px-0" : ""} ${
              page === p
                ? "bg-accent text-accent-fg"
                : "text-muted hover:text-fg hover:bg-card"
            }`}
          >
            <Icon className="w-[18px] h-[18px] shrink-0" />
            {!collapsed && <span className="truncate">{label}</span>}
          </button>
        ))}
      </div>

      <div className="mt-2 pt-2 border-t border-border flex flex-col gap-1">
        <button
          onClick={() => setPage("settings")}
          title={collapsed ? t("header.account.settings") : undefined}
          aria-current={page === "settings" ? "page" : undefined}
          className={`${rowBase} ${collapsed ? "justify-center px-0" : ""} ${
            page === "settings"
              ? "bg-accent text-accent-fg"
              : "text-muted hover:text-fg hover:bg-card"
          }`}
        >
          <Settings className="w-[18px] h-[18px] shrink-0" />
          {!collapsed && <span className="truncate">{t("header.account.settings")}</span>}
        </button>

        <div className="relative">
          <button
            onClick={() => setAcctOpen((o) => !o)}
            title={collapsed ? name : undefined}
            className={`${rowBase} ${collapsed ? "justify-center px-0" : ""} text-muted hover:text-fg hover:bg-card`}
          >
            <AvatarImg
              src={me.avatar_url}
              fallback={name}
              className="w-[22px] h-[22px] rounded-full text-[10px] shrink-0"
            />
            {!collapsed && <span className="truncate flex-1 text-left">{name}</span>}
          </button>

          {acctOpen && (
            <>
              <div className="fixed inset-0 z-20" onClick={() => setAcctOpen(false)} />
              <div className="glass absolute left-full bottom-0 ml-2 w-60 rounded-xl p-3 z-30 animate-[popIn_0.16s_ease]">
                <div className="flex items-center gap-3 pb-3 border-b border-border">
                  <AvatarImg
                    src={me.avatar_url}
                    fallback={name}
                    className="w-10 h-10 rounded-full text-sm shrink-0"
                  />
                  <div className="min-w-0">
                    <div className="text-sm font-semibold truncate">{name}</div>
                    <div className="text-xs text-muted truncate">{me.email}</div>
                  </div>
                </div>
                {me.role === "admin" && (
                  <div className="flex items-center gap-1.5 mt-2 text-[11px] font-medium text-accent">
                    <Shield className="w-3.5 h-3.5" />
                    {t("header.account.admin")}
                  </div>
                )}
                <div className="mt-2 flex flex-col">
                  <button
                    onClick={() => {
                      onOpenAbout();
                      setAcctOpen(false);
                    }}
                    className="w-full flex items-center gap-2 text-sm px-2 py-2 rounded-lg text-muted hover:text-fg hover:bg-card transition"
                  >
                    <Info className="w-4 h-4" />
                    {t("header.account.about")}
                  </button>
                  <button
                    onClick={logout}
                    className="w-full flex items-center gap-2 text-sm px-2 py-2 rounded-lg text-muted hover:text-fg hover:bg-card transition"
                  >
                    <LogOut className="w-4 h-4" />
                    {t("header.account.signOut")}
                  </button>
                </div>
              </div>
            </>
          )}
        </div>
      </div>
    </nav>
  );
}