import { lazy, Suspense } from 'react';
import { Routes, Route, Navigate } from 'react-router-dom';
import { useAuthStore } from '@/stores/auth.store';

// Layouts - kept as static imports since they're used on every page
import { AuthLayout } from '@/layouts/AuthLayout';
import { DashboardLayout } from '@/layouts/DashboardLayout';

// Loading fallback component
function PageLoader() {
  return (
    <div className="flex items-center justify-center min-h-[400px]">
      <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-primary-600"></div>
    </div>
  );
}

// Lazy loaded pages - Auth
const LoginPage = lazy(() => import('@/pages/auth/LoginPage').then(m => ({ default: m.LoginPage })));
const RegisterPage = lazy(() => import('@/pages/auth/RegisterPage').then(m => ({ default: m.RegisterPage })));
const ForgotPasswordPage = lazy(() => import('@/pages/auth/ForgotPasswordPage').then(m => ({ default: m.ForgotPasswordPage })));
const OAuthCallbackPage = lazy(() => import('@/pages/auth/OAuthCallbackPage').then(m => ({ default: m.OAuthCallbackPage })));

// Lazy loaded pages - Dashboard
const DashboardPage = lazy(() => import('@/pages/dashboard/DashboardPage').then(m => ({ default: m.DashboardPage })));
const BillingPage = lazy(() => import('@/pages/dashboard/BillingPage').then(m => ({ default: m.BillingPage })));
const UsersPage = lazy(() => import('@/pages/dashboard/UsersPage').then(m => ({ default: m.UsersPage })));
const AIPage = lazy(() => import('@/pages/dashboard/AIPage').then(m => ({ default: m.AIPage })));
const StoragePage = lazy(() => import('@/pages/dashboard/StoragePage').then(m => ({ default: m.StoragePage })));
const WebhooksPage = lazy(() => import('@/pages/dashboard/WebhooksPage').then(m => ({ default: m.WebhooksPage })));
const AuditLogsPage = lazy(() => import('@/pages/dashboard/AuditLogsPage').then(m => ({ default: m.AuditLogsPage })));
const FeatureFlagsPage = lazy(() => import('@/pages/dashboard/FeatureFlagsPage').then(m => ({ default: m.FeatureFlagsPage })));

// Lazy loaded pages - Sales
const SalesPage = lazy(() => import('@/pages/dashboard/sales').then(m => ({ default: m.SalesPage })));
const LeadsPage = lazy(() => import('@/pages/dashboard/sales').then(m => ({ default: m.LeadsPage })));
const LeadDetailPage = lazy(() => import('@/pages/dashboard/sales').then(m => ({ default: m.LeadDetailPage })));
const OpportunitiesPage = lazy(() => import('@/pages/dashboard/sales').then(m => ({ default: m.OpportunitiesPage })));
const OpportunityDetailPage = lazy(() => import('@/pages/dashboard/sales').then(m => ({ default: m.OpportunityDetailPage })));
const ActivitiesPage = lazy(() => import('@/pages/dashboard/sales').then(m => ({ default: m.ActivitiesPage })));

// Lazy loaded pages - Commissions
const CommissionsPage = lazy(() => import('@/pages/dashboard/commissions').then(m => ({ default: m.CommissionsPage })));
const SchemesPage = lazy(() => import('@/pages/dashboard/commissions').then(m => ({ default: m.SchemesPage })));
const EntriesPage = lazy(() => import('@/pages/dashboard/commissions').then(m => ({ default: m.EntriesPage })));
const PeriodsPage = lazy(() => import('@/pages/dashboard/commissions').then(m => ({ default: m.PeriodsPage })));
const MyEarningsPage = lazy(() => import('@/pages/dashboard/commissions').then(m => ({ default: m.MyEarningsPage })));

// Lazy loaded pages - Goals
const GoalsPage = lazy(() => import('@/pages/dashboard/goals').then(m => ({ default: m.GoalsPage })));
const GoalDefinitionsPage = lazy(() => import('@/pages/dashboard/goals').then(m => ({ default: m.DefinitionsPage })));
const MyGoalsPage = lazy(() => import('@/pages/dashboard/goals').then(m => ({ default: m.MyGoalsPage })));
const GoalDetailPage = lazy(() => import('@/pages/dashboard/goals').then(m => ({ default: m.GoalDetailPage })));
const AssignmentDetailPage = lazy(() => import('@/pages/dashboard/goals').then(m => ({ default: m.AssignmentDetailPage })));
const GoalReportsPage = lazy(() => import('@/pages/dashboard/goals').then(m => ({ default: m.ReportsPage })));

// Lazy loaded pages - MLM
const MLMPage = lazy(() => import('@/pages/dashboard/mlm').then(m => ({ default: m.MLMPage })));
const StructuresPage = lazy(() => import('@/pages/dashboard/mlm').then(m => ({ default: m.StructuresPage })));
const StructureDetailPage = lazy(() => import('@/pages/dashboard/mlm').then(m => ({ default: m.StructureDetailPage })));
const RanksPage = lazy(() => import('@/pages/dashboard/mlm').then(m => ({ default: m.RanksPage })));
const MyNetworkPage = lazy(() => import('@/pages/dashboard/mlm').then(m => ({ default: m.MyNetworkPage })));
const NodeDetailPage = lazy(() => import('@/pages/dashboard/mlm').then(m => ({ default: m.NodeDetailPage })));
const MLMMyEarningsPage = lazy(() => import('@/pages/dashboard/mlm').then(m => ({ default: m.MyEarningsPage })));

// Lazy loaded pages - Admin
const WhatsAppSettings = lazy(() => import('@/pages/admin/WhatsAppSettings').then(m => ({ default: m.WhatsAppSettings })));
const AnalyticsDashboardPage = lazy(() => import('@/pages/admin/AnalyticsDashboardPage').then(m => ({ default: m.AnalyticsDashboardPage })));

// Lazy loaded pages - Settings
const SettingsPage = lazy(() => import('@/pages/settings').then(m => ({ default: m.SettingsPage })));

// Lazy loaded pages - Superadmin
const TenantsPage = lazy(() => import('@/pages/superadmin').then(m => ({ default: m.TenantsPage })));
const TenantDetailPage = lazy(() => import('@/pages/superadmin').then(m => ({ default: m.TenantDetailPage })));
const MetricsPage = lazy(() => import('@/pages/superadmin').then(m => ({ default: m.MetricsPage })));

// Lazy loaded pages - Onboarding
const OnboardingPage = lazy(() => import('@/pages/onboarding').then(m => ({ default: m.OnboardingPage })));

// Protected Route wrapper
function ProtectedRoute({ children }: { children: React.ReactNode }) {
  const isAuthenticated = useAuthStore((state) => state.isAuthenticated);

  if (!isAuthenticated) {
    return <Navigate to="/auth/login" replace />;
  }

  return <>{children}</>;
}

// Superadmin Route wrapper (requires superadmin role)
function SuperadminRoute({ children }: { children: React.ReactNode }) {
  const { isAuthenticated, user } = useAuthStore();

  if (!isAuthenticated) {
    return <Navigate to="/auth/login" replace />;
  }

  // Check if user has superadmin role
  // In a real app, this would check against the user's roles from the API
  if (user?.role !== 'superadmin') {
    return <Navigate to="/dashboard" replace />;
  }

  return <>{children}</>;
}

// Guest Route wrapper (redirect to dashboard if already logged in)
function GuestRoute({ children }: { children: React.ReactNode }) {
  const isAuthenticated = useAuthStore((state) => state.isAuthenticated);

  if (isAuthenticated) {
    return <Navigate to="/dashboard" replace />;
  }

  return <>{children}</>;
}

// Suspense wrapper for lazy loaded pages
function SuspensePage({ children }: { children: React.ReactNode }) {
  return <Suspense fallback={<PageLoader />}>{children}</Suspense>;
}

export function AppRouter() {
  return (
    <Routes>
      {/* Public routes */}
      <Route path="/" element={<Navigate to="/auth/login" replace />} />

      {/* Auth routes */}
      <Route
        path="/auth"
        element={
          <GuestRoute>
            <AuthLayout />
          </GuestRoute>
        }
      >
        <Route path="login" element={<SuspensePage><LoginPage /></SuspensePage>} />
        <Route path="register" element={<SuspensePage><RegisterPage /></SuspensePage>} />
        <Route path="forgot-password" element={<SuspensePage><ForgotPasswordPage /></SuspensePage>} />
      </Route>

      {/* OAuth callback route - outside GuestRoute since user may be authenticated after callback */}
      <Route path="/auth/oauth/callback/:provider" element={<SuspensePage><OAuthCallbackPage /></SuspensePage>} />

      {/* Dashboard routes */}
      <Route
        path="/dashboard"
        element={
          <ProtectedRoute>
            <DashboardLayout />
          </ProtectedRoute>
        }
      >
        <Route index element={<SuspensePage><DashboardPage /></SuspensePage>} />
        <Route path="settings" element={<SuspensePage><SettingsPage /></SuspensePage>} />
        <Route path="billing" element={<SuspensePage><BillingPage /></SuspensePage>} />
        <Route path="users" element={<SuspensePage><UsersPage /></SuspensePage>} />
        <Route path="ai" element={<SuspensePage><AIPage /></SuspensePage>} />
        <Route path="storage" element={<SuspensePage><StoragePage /></SuspensePage>} />
        <Route path="webhooks" element={<SuspensePage><WebhooksPage /></SuspensePage>} />
        <Route path="audit" element={<SuspensePage><AuditLogsPage /></SuspensePage>} />
        <Route path="feature-flags" element={<SuspensePage><FeatureFlagsPage /></SuspensePage>} />
        <Route path="whatsapp" element={<SuspensePage><WhatsAppSettings /></SuspensePage>} />
        <Route path="analytics" element={<SuspensePage><AnalyticsDashboardPage /></SuspensePage>} />

        {/* Sales routes */}
        <Route path="sales" element={<SuspensePage><SalesPage /></SuspensePage>} />
        <Route path="sales/leads" element={<SuspensePage><LeadsPage /></SuspensePage>} />
        <Route path="sales/leads/:id" element={<SuspensePage><LeadDetailPage /></SuspensePage>} />
        <Route path="sales/opportunities" element={<SuspensePage><OpportunitiesPage /></SuspensePage>} />
        <Route path="sales/opportunities/:id" element={<SuspensePage><OpportunityDetailPage /></SuspensePage>} />
        <Route path="sales/activities" element={<SuspensePage><ActivitiesPage /></SuspensePage>} />

        {/* Commissions routes */}
        <Route path="commissions" element={<SuspensePage><CommissionsPage /></SuspensePage>} />
        <Route path="commissions/schemes" element={<SuspensePage><SchemesPage /></SuspensePage>} />
        <Route path="commissions/entries" element={<SuspensePage><EntriesPage /></SuspensePage>} />
        <Route path="commissions/periods" element={<SuspensePage><PeriodsPage /></SuspensePage>} />
        <Route path="commissions/my-earnings" element={<SuspensePage><MyEarningsPage /></SuspensePage>} />

        {/* Goals routes */}
        <Route path="goals" element={<SuspensePage><GoalsPage /></SuspensePage>} />
        <Route path="goals/definitions" element={<SuspensePage><GoalDefinitionsPage /></SuspensePage>} />
        <Route path="goals/definitions/:id" element={<SuspensePage><GoalDetailPage /></SuspensePage>} />
        <Route path="goals/my-goals" element={<SuspensePage><MyGoalsPage /></SuspensePage>} />
        <Route path="goals/assignments/:id" element={<SuspensePage><AssignmentDetailPage /></SuspensePage>} />
        <Route path="goals/reports" element={<SuspensePage><GoalReportsPage /></SuspensePage>} />

        {/* MLM routes */}
        <Route path="mlm" element={<SuspensePage><MLMPage /></SuspensePage>} />
        <Route path="mlm/structures" element={<SuspensePage><StructuresPage /></SuspensePage>} />
        <Route path="mlm/structures/:id" element={<SuspensePage><StructureDetailPage /></SuspensePage>} />
        <Route path="mlm/ranks" element={<SuspensePage><RanksPage /></SuspensePage>} />
        <Route path="mlm/my-network" element={<SuspensePage><MyNetworkPage /></SuspensePage>} />
        <Route path="mlm/nodes/:id" element={<SuspensePage><NodeDetailPage /></SuspensePage>} />
        <Route path="mlm/my-earnings" element={<SuspensePage><MLMMyEarningsPage /></SuspensePage>} />
      </Route>

      {/* Superadmin routes */}
      <Route
        path="/superadmin"
        element={
          <SuperadminRoute>
            <DashboardLayout />
          </SuperadminRoute>
        }
      >
        <Route index element={<Navigate to="/superadmin/tenants" replace />} />
        <Route path="tenants" element={<SuspensePage><TenantsPage /></SuspensePage>} />
        <Route path="tenants/:id" element={<SuspensePage><TenantDetailPage /></SuspensePage>} />
        <Route path="metrics" element={<SuspensePage><MetricsPage /></SuspensePage>} />
      </Route>

      {/* Onboarding route */}
      <Route
        path="/onboarding"
        element={
          <ProtectedRoute>
            <SuspensePage><OnboardingPage /></SuspensePage>
          </ProtectedRoute>
        }
      />

      {/* 404 */}
      <Route path="*" element={<Navigate to="/" replace />} />
    </Routes>
  );
}