import { NavLink, ScrollArea, Divider, Text } from '@mantine/core';
import { useNavigate, useLocation } from 'react-router-dom';
import {
  IconDashboard,
  IconListDetails,
  IconReceipt,
  IconHome,
  IconFileInvoice,
  IconCash,
  IconReportAnalytics,
  IconChartSankey,
  IconShieldCheck,
  IconBuildingBank,
  IconUsers,
  IconCrown,
  IconCategory,
  IconChartAreaLine,
  IconClipboardCheck,
  IconSparkles,
  IconCalculator,
  IconGitCompare,
  IconScale,
} from '@tabler/icons-react';
import { useAuthStore } from '../../stores/authStore';

const navSections = [
  {
    items: [
      { label: 'Dashboard', icon: IconDashboard, path: '/dashboard' },
    ],
  },
  {
    label: 'Financials',
    items: [
      { label: 'Accounts', icon: IconListDetails, path: '/accounts', tourId: 'nav-accounts' },
      { label: 'Cash Flow', icon: IconChartAreaLine, path: '/cash-flow' },
      { label: 'Monthly Actuals', icon: IconClipboardCheck, path: '/monthly-actuals' },
      { label: 'Budgets', icon: IconReportAnalytics, path: '/budgets/2026', tourId: 'nav-budgets' },
    ],
  },
  {
    label: 'Assessments',
    items: [
      { label: 'Units / Homeowners', icon: IconHome, path: '/units' },
      { label: 'Assessment Groups', icon: IconCategory, path: '/assessment-groups', tourId: 'nav-assessment-groups' },
    ],
  },
  {
    label: 'Board Planning',
    items: [
      { label: 'Budget Planning', icon: IconReportAnalytics, path: '/board-planning/budgets' },
      {
        label: 'Projects', icon: IconShieldCheck, path: '/projects',
        children: [
          { label: 'Capital Planning', path: '/capital-projects' },
        ],
      },
      {
        label: 'Assessment Scenarios', icon: IconCalculator, path: '/board-planning/assessments',
      },
      { label: 'Investment Planning', icon: IconSparkles, path: '/investment-planning', tourId: 'nav-investment-planning' },
      { label: 'Investment Scenarios', icon: IconScale, path: '/board-planning/investments' },
      { label: 'Compare Scenarios', icon: IconGitCompare, path: '/board-planning/compare' },
    ],
  },
  {
    label: 'Board Reference',
    items: [
      { label: 'Vendors', icon: IconUsers, path: '/vendors' },
    ],
  },
  {
    label: 'Transactions',
    items: [
      { label: 'Transactions', icon: IconReceipt, path: '/transactions', tourId: 'nav-transactions' },
      { label: 'Invoices', icon: IconFileInvoice, path: '/invoices' },
      { label: 'Payments', icon: IconCash, path: '/payments' },
    ],
  },
  {
    label: 'Reports',
    items: [
      {
        label: 'Reports',
        icon: IconChartSankey,
        tourId: 'nav-reports',
        children: [
          { label: 'Balance Sheet', path: '/reports/balance-sheet' },
          { label: 'Income Statement', path: '/reports/income-statement' },
          { label: 'Cash Flow', path: '/reports/cash-flow' },
          { label: 'Budget vs Actual', path: '/reports/budget-vs-actual' },
          { label: 'Aging Report', path: '/reports/aging' },
          { label: 'Sankey Diagram', path: '/reports/sankey' },
          { label: 'Year-End', path: '/reports/year-end' },
          { label: 'Quarterly Financial', path: '/reports/quarterly' },
        ],
      },
    ],
  },
];

interface SidebarProps {
  onNavigate?: () => void;
}

export function Sidebar({ onNavigate }: SidebarProps) {
  const navigate = useNavigate();
  const location = useLocation();
  const user = useAuthStore((s) => s.user);
  const currentOrg = useAuthStore((s) => s.currentOrg);
  const organizations = useAuthStore((s) => s.organizations);
  const isAdminOnly = location.pathname.startsWith('/admin') && !currentOrg;

  const go = (path: string) => {
    navigate(path);
    onNavigate?.();
  };

  // When on admin route with no org selected, show admin-only sidebar
  if (isAdminOnly && user?.isSuperadmin) {
    return (
      <ScrollArea p="sm">
        <Text size="xs" c="dimmed" fw={700} tt="uppercase" px="sm" pb={4}>
          Platform Administration
        </Text>
        <NavLink
          label="Admin Panel"
          leftSection={<IconCrown size={18} />}
          active={location.pathname === '/admin'}
          onClick={() => go('/admin')}
          color="red"
        />
        {organizations && organizations.length > 0 && (
          <>
            <Divider my="sm" />
            <NavLink
              label="Switch to Tenant"
              leftSection={<IconBuildingBank size={18} />}
              onClick={() => go('/select-org')}
              variant="subtle"
            />
          </>
        )}
      </ScrollArea>
    );
  }

  return (
    <ScrollArea p="sm" data-tour="sidebar-nav">
      {navSections.map((section, sIdx) => (
        <div key={sIdx}>
          {section.label && (
            <>
              {sIdx > 0 && <Divider my={6} />}
              <Text size="xs" c="dimmed" fw={700} tt="uppercase" px="sm" pb={2} pt={sIdx > 0 ? 4 : 0}>
                {section.label}
              </Text>
            </>
          )}
          {section.items.map((item: any) =>
            item.children && !item.path ? (
              // Collapsible group without a parent route (e.g. Reports)
              <NavLink
                key={item.label}
                label={item.label}
                leftSection={<item.icon size={18} />}
                defaultOpened={item.children.some((c: any) =>
                  location.pathname.startsWith(c.path),
                )}
                data-tour={item.tourId || undefined}
              >
                {item.children.map((child: any) => (
                  <NavLink
                    key={child.path}
                    label={child.label}
                    active={location.pathname === child.path}
                    onClick={() => go(child.path)}
                  />
                ))}
              </NavLink>
            ) : item.children && item.path ? (
              // Parent with its own route + nested children (e.g. Projects > Capital Planning)
              <NavLink
                key={item.path}
                label={item.label}
                leftSection={<item.icon size={18} />}
                defaultOpened={
                  location.pathname === item.path ||
                  item.children.some((c: any) => location.pathname.startsWith(c.path))
                }
                data-tour={item.tourId || undefined}
                active={location.pathname === item.path}
                onClick={() => go(item.path!)}
              >
                {item.children.map((child: any) => (
                  <NavLink
                    key={child.path}
                    label={child.label}
                    active={location.pathname === child.path}
                    onClick={(e: React.MouseEvent) => { e.stopPropagation(); go(child.path); }}
                  />
                ))}
              </NavLink>
            ) : (
              <NavLink
                key={item.path}
                label={item.label}
                leftSection={<item.icon size={18} />}
                active={location.pathname === item.path}
                onClick={() => go(item.path!)}
                data-tour={item.tourId || undefined}
              />
            ),
          )}
        </div>
      ))}

      {user?.isSuperadmin && (
        <>
          <Divider my="sm" />
          <Text size="xs" c="dimmed" fw={700} tt="uppercase" px="sm" pb={4}>
            Platform Admin
          </Text>
          <NavLink
            label="Admin Panel"
            leftSection={<IconCrown size={18} />}
            active={location.pathname === '/admin'}
            onClick={() => go('/admin')}
            color="red"
          />
        </>
      )}
    </ScrollArea>
  );
}