import { Outlet, Link, useNavigate, useLocation } from "react-router-dom";
import { SidebarProvider, SidebarTrigger } from "@/components/ui/sidebar";
import {
  Sidebar, SidebarContent, SidebarGroup, SidebarGroupContent,
  SidebarGroupLabel, SidebarMenu, SidebarMenuButton, SidebarMenuItem,
  SidebarHeader, SidebarFooter, SidebarSeparator, useSidebar,
} from "@/components/ui/sidebar";
import { NavLink } from "@/components/NavLink";
import { useAuth, UserRole } from "@/contexts/AuthContext";
import NotificationDropdown from "@/components/NotificationDropdown";
import { ThemeToggle } from "@/components/ThemeToggle";
import { LanguageToggle } from "@/components/LanguageToggle";
import { Button } from "@/components/ui/button";
import {
  DropdownMenu, DropdownMenuContent, DropdownMenuItem,
  DropdownMenuSeparator, DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import { LogOut, User, Settings, LucideIcon } from "lucide-react";
import React from "react";

export interface NavItem {
  title: string;
  url: string;
  icon: LucideIcon;
}

export interface NavGroup {
  label: string;
  items: NavItem[];
}

interface RoleLayoutProps {
  navGroups: NavGroup[];
  role: UserRole;
}

function SidebarNav({ navGroups }: { navGroups: NavGroup[] }) {
  const { state } = useSidebar();
  const collapsed = state === "collapsed";

  return (
    <>
      {navGroups.map((group) => (
        <SidebarGroup key={group.label}>
          <SidebarGroupLabel>{group.label}</SidebarGroupLabel>
          <SidebarGroupContent>
            <SidebarMenu>
              {group.items.map((item) => (
                <SidebarMenuItem key={item.url}>
                  <SidebarMenuButton asChild tooltip={item.title}>
                    <NavLink
                      to={item.url}
                      end={item.url.endsWith("/dashboard")}
                      className="flex items-center gap-2 px-2 py-1.5 rounded-md text-sm text-sidebar-foreground hover:bg-sidebar-accent transition-colors"
                      activeClassName="bg-sidebar-accent text-sidebar-accent-foreground font-medium"
                    >
                      <item.icon className="h-4 w-4 shrink-0" />
                      {!collapsed && <span>{item.title}</span>}
                    </NavLink>
                  </SidebarMenuButton>
                </SidebarMenuItem>
              ))}
            </SidebarMenu>
          </SidebarGroupContent>
        </SidebarGroup>
      ))}
    </>
  );
}

export default function RoleLayout({ navGroups, role }: RoleLayoutProps) {
  const { user, logout } = useAuth();
  const navigate = useNavigate();

  const initials = user?.name?.split(" ").map(w => w[0]).join("").slice(0, 2).toUpperCase() ?? "??";

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

  return (
    <SidebarProvider>
      <div className="min-h-screen flex w-full">
        <Sidebar collapsible="icon">
          <SidebarHeader className="p-4">
            <div className="flex items-center gap-2">
              <img
                src="/logo.png"
                alt="EnCoach"
                className="h-9 w-9 shrink-0 rounded-lg object-contain group-data-[collapsible=icon]:block hidden"
              />
              <img
                src="/logo.png"
                alt="EnCoach — Unlock your potential with AI powered platform"
                className="h-14 w-auto shrink-0 object-contain group-data-[collapsible=icon]:hidden"
              />
            </div>
          </SidebarHeader>
          <SidebarSeparator />
          <SidebarContent>
            <SidebarNav navGroups={navGroups} />
          </SidebarContent>
          <SidebarSeparator />
          <SidebarFooter className="p-3">
            <div className="flex items-center gap-2">
              <div className="h-8 w-8 rounded-full bg-primary/10 flex items-center justify-center shrink-0">
                <span className="text-xs font-semibold text-primary">{initials}</span>
              </div>
              <div className="flex flex-col min-w-0 group-data-[collapsible=icon]:hidden">
                <span className="text-sm font-medium truncate text-sidebar-foreground">{user?.name}</span>
                <span className="text-xs text-muted-foreground truncate">{user?.email}</span>
              </div>
            </div>
          </SidebarFooter>
        </Sidebar>

        <div className="flex-1 flex flex-col min-w-0">
          <header className="h-14 border-b bg-card flex items-center justify-between px-4 shrink-0">
            <div className="flex items-center gap-3">
              <SidebarTrigger />
              <span className="text-sm font-medium text-muted-foreground capitalize">{role} Portal</span>
            </div>
            <div className="flex items-center gap-2">
              <LanguageToggle />
              <ThemeToggle />
              <NotificationDropdown />
              <DropdownMenu>
                <DropdownMenuTrigger asChild>
                  <Button variant="ghost" size="icon" className="rounded-full">
                    <div className="h-8 w-8 rounded-full bg-primary flex items-center justify-center">
                      <span className="text-xs font-semibold text-primary-foreground">{initials}</span>
                    </div>
                  </Button>
                </DropdownMenuTrigger>
                <DropdownMenuContent align="end" className="w-48">
                  <div className="px-3 py-2">
                    <p className="text-sm font-medium">{user?.name}</p>
                    <p className="text-xs text-muted-foreground">{user?.email}</p>
                  </div>
                  <DropdownMenuSeparator />
                  <DropdownMenuItem onClick={() => navigate(`/${role}/profile`)}>
                    <User className="mr-2 h-4 w-4" /> Profile
                  </DropdownMenuItem>
                  <DropdownMenuSeparator />
                  <DropdownMenuItem onClick={handleLogout}>
                    <LogOut className="mr-2 h-4 w-4" /> Logout
                  </DropdownMenuItem>
                </DropdownMenuContent>
              </DropdownMenu>
            </div>
          </header>
          <main className="flex-1 overflow-auto p-6">
            <Outlet />
          </main>
        </div>
      </div>
    </SidebarProvider>
  );
}