"use client"

import { useState, useEffect } from "react";
import { SidebarTrigger } from "@/components/ui/sidebar";
import { Separator } from "@/components/ui/separator";
import { Button } from "@/components/ui/button";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
} from "@/components/ui/alert-dialog";
import { Avatar, AvatarFallback } from "@/components/ui/avatar";
import { Badge } from "@/components/ui/badge";
import { Moon, Sun, LogOut, User, Search, Globe, Copy } from "lucide-react";
import { useTheme } from "next-themes";
import { toast } from "sonner";
import { useAuthStore } from "@/stores/auth-store";
import { CommandPalette, openCommandPalette } from "@/components/layout/command-palette";
import { AppBreadcrumbs } from "@/components/layout/breadcrumbs";
import { QuickActions } from "@/components/layout/quick-actions";
import { NotificationsPanel } from "@/components/layout/notifications-panel";

const pageTitles: Record<string, string> = {
  "/": "Dashboard",
  "/catalog": "Catalog",
  "/users": "Users",
  "/wallets": "Wallets",
  "/purchases": "Purchases",
  "/audit": "Audit Log",
  "/categories": "Categories",
  "/locations": "Locations",
  "/settings": "Settings",
  "/locales": "Locales",
  "/seed": "Danger Zone",
  "/login": "Sign In",
};

function getInitialTime() {
  const now = new Date();
  const hh = String(now.getHours()).padStart(2, "0");
  const mm = String(now.getMinutes()).padStart(2, "0");
  return `${hh}:${mm}`;
}

function RealtimeClock() {
  const [time, setTime] = useState(getInitialTime);

  useEffect(() => {
    const interval = setInterval(() => {
      const now = new Date();
      const hh = String(now.getHours()).padStart(2, "0");
      const mm = String(now.getMinutes()).padStart(2, "0");
      setTime(`${hh}:${mm}`);
    }, 1000);
    return () => clearInterval(interval);
  }, []);

  const parts = time.split(":");

  return (
    <span className="text-xs text-muted-foreground font-mono tabular-nums hidden md:flex items-center">
      {parts[0]}<span className="colon-pulse mx-px">:</span>{parts[1]}
    </span>
  );
}

export function AdminHeader() {
  const [hash, setHash] = useState("");
  const { theme, setTheme } = useTheme();
  const { role, logout } = useAuthStore();
  const [logoutOpen, setLogoutOpen] = useState(false);
  const [onion, setOnion] = useState("");

  useEffect(() => {
    const update = () => setHash(window.location.hash.slice(1) || "/");
    update();
    window.addEventListener("hashchange", update);
    return () => window.removeEventListener("hashchange", update);
  }, []);

  useEffect(() => {
    let cancelled = false;
    (async () => {
      try {
        const res = await fetch("/api/system/info");
        if (!res.ok) throw new Error("Failed to fetch system info");
        const data = await res.json();
        if (cancelled) return;
        setOnion(data.adminOnion || "");
      } catch {
        if (cancelled) return;
        setOnion("");
      }
    })();
    return () => {
      cancelled = true;
    };
  }, []);

  const copyOnion = async () => {
    if (!onion) return;
    try {
      await navigator.clipboard.writeText(onion);
      toast.success("Onion address copied");
    } catch {
      toast.error("Failed to copy onion address");
    }
  };

  const title =
    pageTitles[hash] ||
    (hash.startsWith("/users/")
      ? "User Detail"
      : hash.split("/").pop()?.charAt(0).toUpperCase() +
          hash.split("/").pop()?.slice(1) ||
        "Page");

  return (
    <header className="flex h-14 shrink-0 items-center gap-2 border-b-0 px-4 gradient-border-b bg-background/80 backdrop-blur-md relative z-10" style={{ borderBottomStyle: 'solid', borderBottomWidth: '1px' }}>
      <SidebarTrigger className="-ml-1" />
      <Separator orientation="vertical" className="mr-2 h-4" />
      <AppBreadcrumbs />
      <h1 className="text-base font-semibold flex-1 truncate hidden sm:block">
        {title}
      </h1>
      {/* 1. Clock (hidden on mobile) */}
      <RealtimeClock />
      {/* 1b. Onion host badge (hidden on mobile) */}
      <button
        type="button"
        onClick={copyOnion}
        disabled={!onion}
        title={onion ? "Copy onion address" : "Onion address not ready yet"}
        className="hidden md:flex items-center gap-1.5 rounded-md border border-border bg-muted/50 px-2 py-1 text-xs font-mono text-muted-foreground hover:bg-muted transition-colors shrink-0 max-w-[220px]"
      >
        <Globe className="size-3.5 shrink-0" />
        <span className="truncate">{onion || "onion: —"}</span>
        {onion && <Copy className="size-3 shrink-0 opacity-60" />}
      </button>
      {/* 2. Command palette search button */}
      <Button
        variant="ghost"
        size="icon"
        onClick={openCommandPalette}
        className="shrink-0"
        title="Search (Ctrl+K)"
      >
        <Search className="size-4" />
        <span className="sr-only">Search</span>
      </Button>
      {/* 3. Notifications bell button */}
      <NotificationsPanel />
      {/* 4. Quick actions zap button */}
      <QuickActions />
      {/* 5. Theme toggle */}
      <Button
        variant="ghost"
        size="icon"
        onClick={() => setTheme(theme === "dark" ? "light" : "dark")}
        className="shrink-0"
      >
        <Sun className="size-4 rotate-0 scale-100 transition-all dark:-rotate-90 dark:scale-0" />
        <Moon className="absolute size-4 rotate-90 scale-0 transition-all dark:rotate-0 dark:scale-100" />
        <span className="sr-only">Toggle theme</span>
      </Button>
      {/* 6. User dropdown */}
      <DropdownMenu>
        <DropdownMenuTrigger asChild>
          <Button variant="ghost" className="relative h-8 w-8 rounded-full">
            <Avatar className="size-8">
              <AvatarFallback className="bg-primary/10 text-primary text-xs">
                {role === "super_admin" ? "SA" : "AD"}
              </AvatarFallback>
            </Avatar>
          </Button>
        </DropdownMenuTrigger>
        <DropdownMenuContent align="end" className="w-48">
          <div className="px-2 py-1.5">
            <p className="text-sm font-medium">
              {role === "super_admin" ? "Super Admin" : "Admin"}
            </p>
            <Badge
              variant={role === "super_admin" ? "default" : "secondary"}
              className="text-[10px] px-1.5 py-0 mt-1"
            >
              {role}
            </Badge>
          </div>
          <DropdownMenuItem onClick={() => { window.location.hash = "/settings"; }}>
            <User className="mr-2 size-4" />
            Settings
          </DropdownMenuItem>
          <DropdownMenuItem
            onClick={() => setLogoutOpen(true)}
            className="text-destructive"
          >
            <LogOut className="mr-2 size-4" />
            Sign out
          </DropdownMenuItem>
        </DropdownMenuContent>
      </DropdownMenu>
      <AlertDialog open={logoutOpen} onOpenChange={setLogoutOpen}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>Sign out</AlertDialogTitle>
            <AlertDialogDescription>
              Are you sure you want to sign out? You will need to
              re-enter your admin token.
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel>Cancel</AlertDialogCancel>
            <AlertDialogAction
              onClick={() => {
                logout();
                window.location.hash = "/login";
              }}
              className="bg-destructive text-white hover:bg-destructive/90"
            >
              Sign out
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>
      <CommandPalette />
    </header>
  );
}