import { useState, useEffect } from "react";
import { Link, Outlet, useLocation, useNavigate } from "react-router-dom";
import {
  Sparkles,
  Calculator,
  BarChart3,
  Landmark,
  PiggyBank,
  Droplets,
  LogOut,
  TrendingUp,
  Wallet,
  Menu,
  Sun,
  Moon,
  Eye,
  EyeOff,
  type LucideIcon,
} from "lucide-react";
import { useTheme } from "@/contexts/theme-context";
import { usePrivacy } from "@/contexts/privacy-context";
import { useAuth } from "@/AuthContext";
import { Button } from "@/components/ui/button";
import {
  Sheet,
  SheetContent,
  SheetHeader,
  SheetTitle,
  SheetClose,
} from "@/components/ui/sheet";
import { Separator } from "@/components/ui/separator";
import { cn } from "@/lib/utils";

interface NavSection {
  label: string;
  items: { to: string; icon: LucideIcon; label: string }[];
}

const navSections: NavSection[] = [
  {
    label: "General",
    items: [{ to: "/asistente", icon: Sparkles, label: "Asistente" }],
  },
  {
    label: "Finanzas",
    items: [
      { to: "/budget", icon: Calculator, label: "Presupuesto" },
      { to: "/salarios", icon: Landmark, label: "Salarios" },
      { to: "/pensions", icon: PiggyBank, label: "Pensiones" },
      { to: "/proyecciones", icon: TrendingUp, label: "Proyecciones" },
      { to: "/analytics", icon: BarChart3, label: "Analytics" },
    ],
  },
  {
    label: "Servicios",
    items: [
      { to: "/servicios-municipales", icon: Droplets, label: "Municipalidad" },
    ],
  },
];

function SidebarNav({ onNavigate }: { onNavigate?: () => void }) {
  const { pathname } = useLocation();
  const isActive = (to: string) =>
    pathname === to || pathname.startsWith(`${to}/`);

  return (
    <nav className="flex flex-col gap-0.5 px-3">
      {navSections.map((section) => (
        <div key={section.label}>
          <p className="text-xs font-medium text-muted-foreground uppercase tracking-wider px-3 pt-4 pb-1">
            {section.label}
          </p>
          {section.items.map(({ to, icon: Icon, label }) => (
            <Link
              key={to}
              to={to}
              onClick={onNavigate}
              className={cn(
                "flex items-center gap-3 px-3 py-2 rounded-lg text-sm font-medium transition-colors",
                isActive(to)
                  ? "bg-primary/10 text-primary"
                  : "text-muted-foreground hover:text-foreground hover:bg-muted",
              )}
            >
              <Icon className="w-4 h-4" />
              {label}
            </Link>
          ))}
        </div>
      ))}
    </nav>
  );
}

export default function Layout() {
  const { theme, toggleTheme } = useTheme();
  const { privacyMode, togglePrivacy } = usePrivacy();
  const { logout } = useAuth();
  const navigate = useNavigate();
  const [mobileOpen, setMobileOpen] = useState(false);

  const handleLogout = async () => {
    await logout();
    navigate("/login", { replace: true });
  };

  return (
    <div className="min-h-screen bg-background text-foreground">
      <header className="border-b border-border backdrop-blur-sm sticky top-0 z-50 bg-background/90">
        <div className="px-4 sm:px-6 py-3 flex items-center justify-between">
          <div className="flex items-center gap-2.5">
            <Button
              variant="ghost"
              size="icon"
              onClick={() => setMobileOpen(true)}
              title="Open menu"
              aria-label="Open menu"
              className="md:hidden"
            >
              <Menu className="w-5 h-5" />
            </Button>
            <div className="w-8 h-8 rounded-lg bg-primary flex items-center justify-center">
              <Wallet className="w-4 h-4 text-primary-foreground" strokeWidth={2.5} />
            </div>
            <span className="text-lg font-bold tracking-tight hidden sm:inline" style={{ fontFamily: "var(--font-heading)" }}>
              Wealthy<span className="text-primary">Smart</span>
            </span>
          </div>

          <div className="flex items-center gap-1">
            <Button variant="ghost" size="icon" onClick={togglePrivacy} title="Toggle privacy mode" aria-label="Toggle privacy mode">
              {privacyMode ? <EyeOff className="w-4 h-4" /> : <Eye className="w-4 h-4" />}
            </Button>
            <Button variant="ghost" size="icon" onClick={toggleTheme} title="Toggle theme" aria-label="Toggle theme">
              {theme === "dark" ? <Sun className="w-4 h-4" /> : <Moon className="w-4 h-4" />}
            </Button>
            <Button
              variant="ghost"
              size="icon"
              onClick={handleLogout}
              title="Sign out"
              aria-label="Sign out"
              className="hidden md:inline-flex"
            >
              <LogOut className="w-4 h-4" />
            </Button>
          </div>
        </div>
      </header>

      <div className="flex">
        <aside className="hidden md:flex md:flex-col md:w-56 md:flex-shrink-0 border-r border-border sticky top-[57px] h-[calc(100vh-57px)] overflow-y-auto bg-background">
          <div className="flex-1">
            <SidebarNav />
          </div>
          <div className="px-3 pb-4">
            <Separator className="mb-2" />
            <button
              onClick={handleLogout}
              className="flex items-center gap-3 px-3 py-2 rounded-lg text-sm font-medium text-muted-foreground hover:text-foreground hover:bg-muted w-full cursor-pointer focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
            >
              <LogOut className="w-4 h-4" />
              Cerrar sesión
            </button>
          </div>
        </aside>

        <Sheet open={mobileOpen} onOpenChange={setMobileOpen}>
          <SheetContent side="left" className="p-0 w-64">
            <SheetHeader className="p-4">
              <SheetTitle className="flex items-center gap-2.5">
                <div className="w-8 h-8 rounded-lg bg-primary flex items-center justify-center">
                  <Wallet className="w-4 h-4 text-primary-foreground" strokeWidth={2.5} />
                </div>
                <span style={{ fontFamily: "var(--font-heading)" }}>
                  Wealthy<span className="text-primary">Smart</span>
                </span>
              </SheetTitle>
            </SheetHeader>
            <Separator />
            <div className="flex flex-col h-[calc(100%-65px)]">
              <div className="flex-1 overflow-y-auto">
                <SidebarNav onNavigate={() => setMobileOpen(false)} />
              </div>
              <div className="px-3 pb-4">
                <Separator className="mb-2" />
                <SheetClose render={<span />}>
                  <button
                    onClick={() => {
                      setMobileOpen(false);
                      void handleLogout();
                    }}
                    className="flex items-center gap-3 px-3 py-2 rounded-lg text-sm font-medium text-muted-foreground hover:text-foreground hover:bg-muted w-full cursor-pointer"
                  >
                    <LogOut className="w-4 h-4" />
                    Cerrar sesión
                  </button>
                </SheetClose>
              </div>
            </div>
          </SheetContent>
        </Sheet>

        <main className="flex-1 min-w-0 px-4 sm:px-6 lg:px-8 py-6">
          <div className="max-w-6xl mx-auto">
            <Outlet />
          </div>
        </main>
      </div>
    </div>
  );
}