'use client';

import { useState } from 'react';
import Link from 'next/link';
import { usePathname } from 'next/navigation';
import {
  LayoutDashboard,
  Users,
  Bookmark,
  Anchor,
  Ship,
  Building2,
  Receipt,
  FileText,
  FolderOpen,
  Mail,
  Bell,
  Settings,
  Shield,
  Home,
  ChevronLeft,
  ChevronRight,
  Menu,
  ChevronDown,
  ChevronUp,
} from 'lucide-react';

import { cn } from '@/lib/utils';
import { useUIStore } from '@/stores/ui-store';
import { Button } from '@/components/ui/button';
import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar';
import { Badge } from '@/components/ui/badge';
import { Separator } from '@/components/ui/separator';
import { ScrollArea } from '@/components/ui/scroll-area';
import { Sheet, SheetContent, SheetTrigger } from '@/components/ui/sheet';
import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from '@/components/ui/tooltip';
import type { UserPortRole } from '@/lib/db/schema/users';
import type { Role } from '@/lib/db/schema/users';

interface SidebarProps {
  portRoles: (UserPortRole & { port: { id: string; slug: string; name: string }; role: Role })[];
  isSuperAdmin?: boolean;
}

interface NavItem {
  href: string;
  label: string;
  icon: React.ElementType;
  exact?: boolean;
}

interface NavSection {
  title: string;
  items: NavItem[];
  adminRequired?: boolean;
  /** When true, only render if the user has marina-side access. */
  marinaRequired?: boolean;
  /** When true, only render if the user has residential-side access. */
  residentialRequired?: boolean;
}

function buildNavSections(portSlug: string | undefined): NavSection[] {
  const base = portSlug ? `/${portSlug}` : '';

  return [
    {
      title: 'Main',
      marinaRequired: true,
      items: [
        { href: `${base}/dashboard`, label: 'Dashboard', icon: LayoutDashboard },
        { href: `${base}/clients`, label: 'Clients', icon: Users },
        { href: `${base}/yachts`, label: 'Yachts', icon: Ship },
        { href: `${base}/companies`, label: 'Companies', icon: Building2 },
        { href: `${base}/interests`, label: 'Interests', icon: Bookmark },
        { href: `${base}/berths`, label: 'Berths', icon: Anchor },
      ],
    },
    {
      title: 'Residential',
      residentialRequired: true,
      items: [
        {
          href: `${base}/residential/clients`,
          label: 'Residential Clients',
          icon: Home,
        },
        {
          href: `${base}/residential/interests`,
          label: 'Residential Interests',
          icon: Bookmark,
        },
      ],
    },
    {
      title: 'Documents',
      marinaRequired: true,
      items: [
        { href: `${base}/documents`, label: 'Documents', icon: FileText },
        { href: `${base}/documents/files`, label: 'Files', icon: FolderOpen },
      ],
    },
    {
      title: 'Financial',
      marinaRequired: true,
      items: [
        { href: `${base}/expenses`, label: 'Expenses', icon: Receipt },
        { href: `${base}/invoices`, label: 'Invoices', icon: FileText },
      ],
    },
    {
      title: 'Communication',
      marinaRequired: true,
      items: [
        { href: `${base}/email`, label: 'Email', icon: Mail },
        { href: `${base}/reminders`, label: 'Reminders', icon: Bell },
      ],
    },
    {
      title: 'Admin',
      adminRequired: true,
      items: [
        { href: `${base}/settings`, label: 'Settings', icon: Settings },
        { href: `${base}/admin`, label: 'Administration', icon: Shield },
      ],
    },
  ];
}

function NavItemLink({
  item,
  collapsed,
  active,
}: {
  item: NavItem;
  collapsed: boolean;
  active: boolean;
}) {
  const content = (
    <Link
      // eslint-disable-next-line @typescript-eslint/no-explicit-any
      href={item.href as any}
      className={cn(
        'flex items-center gap-3 px-3 py-2 rounded-md text-sm font-medium transition-colors duration-150',
        'text-[#cdcfd6] hover:bg-[#171f35] hover:text-white',
        active && 'border-l-2 border-[#3a7bc8] bg-[#3a7bc810] text-white pl-[10px]',
        collapsed && 'justify-center px-2',
      )}
    >
      <item.icon
        className={cn(
          'shrink-0',
          active ? 'text-[#3a7bc8]' : 'text-[#83aab1]',
          collapsed ? 'w-5 h-5' : 'w-4 h-4',
        )}
      />
      {!collapsed && <span>{item.label}</span>}
    </Link>
  );

  if (collapsed) {
    return (
      <Tooltip>
        <TooltipTrigger asChild>{content}</TooltipTrigger>
        <TooltipContent side="right" className="font-medium">
          {item.label}
        </TooltipContent>
      </Tooltip>
    );
  }

  return content;
}

function SidebarContent({
  collapsed,
  portSlug,
  portRoles,
  hasAdminAccess,
  hasMarinaAccess,
  hasResidentialAccess,
}: {
  collapsed: boolean;
  portSlug: string | undefined;
  portRoles: SidebarProps['portRoles'];
  hasAdminAccess: boolean;
  hasMarinaAccess: boolean;
  hasResidentialAccess: boolean;
}) {
  const pathname = usePathname();
  const [adminExpanded, setAdminExpanded] = useState(false);
  const sections = buildNavSections(portSlug);

  function isActive(href: string, exact?: boolean): boolean {
    if (exact) return pathname === href;
    return pathname.startsWith(href);
  }

  return (
    <div className="flex flex-col h-full bg-[#1e2844]">
      {/* Logo area */}
      <div
        className={cn(
          'flex items-center gap-3 px-4 py-5 border-b border-[#474e66]',
          collapsed && 'justify-center px-2',
        )}
      >
        <div className="shrink-0 w-8 h-8 rounded-md bg-[#3a7bc8] flex items-center justify-center">
          <span className="text-white font-bold text-sm">PN</span>
        </div>
        {!collapsed && (
          <div className="min-w-0">
            <p className="text-white font-semibold text-sm leading-tight truncate">Port Nimara</p>
            <p className="text-[#83aab1] text-xs truncate">Marina CRM</p>
          </div>
        )}
      </div>

      {/* Nav */}
      <ScrollArea className="flex-1 py-2">
        <TooltipProvider delayDuration={0}>
          <nav className="px-2 space-y-4">
            {sections.map((section) => {
              if (section.adminRequired && !hasAdminAccess) return null;
              if (section.marinaRequired && !hasMarinaAccess) return null;
              if (section.residentialRequired && !hasResidentialAccess) return null;

              return (
                <div key={section.title}>
                  {!collapsed && (
                    <div className="flex items-center justify-between px-1 mb-1">
                      <span className="text-[#71768a] text-xs font-medium uppercase tracking-wider">
                        {section.title}
                      </span>
                      {section.adminRequired && (
                        <button
                          onClick={() => setAdminExpanded((v) => !v)}
                          className="text-[#71768a] hover:text-[#cdcfd6] transition-colors"
                        >
                          {adminExpanded ? (
                            <ChevronUp className="w-3 h-3" />
                          ) : (
                            <ChevronDown className="w-3 h-3" />
                          )}
                        </button>
                      )}
                    </div>
                  )}
                  {(!section.adminRequired || adminExpanded || collapsed) && (
                    <ul className="space-y-0.5">
                      {section.items.map((item) => (
                        <li key={item.href}>
                          <NavItemLink
                            item={item}
                            collapsed={collapsed}
                            active={isActive(item.href, item.exact)}
                          />
                        </li>
                      ))}
                    </ul>
                  )}
                  <Separator className="mt-3 bg-[#474e66]/50" />
                </div>
              );
            })}
          </nav>
        </TooltipProvider>
      </ScrollArea>

      {/* User footer */}
      <div className={cn('border-t border-[#474e66] p-3', collapsed && 'flex justify-center')}>
        {collapsed ? (
          <Tooltip>
            <TooltipTrigger asChild>
              <Avatar className="w-8 h-8 cursor-pointer">
                <AvatarImage src={undefined} />
                <AvatarFallback className="bg-[#3a7bc8] text-white text-xs font-semibold">
                  U
                </AvatarFallback>
              </Avatar>
            </TooltipTrigger>
            <TooltipContent side="right">User Profile</TooltipContent>
          </Tooltip>
        ) : (
          <div className="flex items-center gap-3">
            <Avatar className="w-8 h-8 shrink-0">
              <AvatarImage src={undefined} />
              <AvatarFallback className="bg-[#3a7bc8] text-white text-xs font-semibold">
                U
              </AvatarFallback>
            </Avatar>
            <div className="flex-1 min-w-0">
              <p className="text-white text-sm font-medium truncate">User Name</p>
              <Badge
                variant="outline"
                className="text-[10px] px-1.5 py-0 text-[#83aab1] border-[#474e66] mt-0.5"
              >
                {portRoles[0]?.role?.name ?? 'Staff'}
              </Badge>
            </div>
          </div>
        )}
      </div>
    </div>
  );
}

export function Sidebar({ portRoles, isSuperAdmin = false }: SidebarProps) {
  const sidebarCollapsed = useUIStore((s) => s.sidebarCollapsed);
  const toggleSidebar = useUIStore((s) => s.toggleSidebar);
  const currentPortSlug = useUIStore((s) => s.currentPortSlug);

  // Super admins see every section regardless of role rows.
  const hasAdminAccess =
    isSuperAdmin ||
    portRoles.some(
      (pr) =>
        pr.role?.permissions?.admin?.manage_users || pr.role?.permissions?.admin?.manage_settings,
    );

  const hasMarinaAccess =
    isSuperAdmin || portRoles.some((pr) => pr.role?.permissions?.clients?.view);

  const hasResidentialAccess =
    isSuperAdmin ||
    portRoles.some((pr) => pr.residentialAccess || pr.role?.permissions?.residential_clients?.view);

  return (
    <>
      {/* Desktop sidebar */}
      <aside
        className={cn(
          'hidden md:flex flex-col h-screen border-r border-[#474e66] transition-all duration-200 ease-in-out shrink-0',
          sidebarCollapsed ? 'w-sidebar-collapsed' : 'w-sidebar',
        )}
        style={{ backgroundColor: '#1e2844' }}
      >
        <SidebarContent
          collapsed={sidebarCollapsed}
          portSlug={currentPortSlug ?? undefined}
          portRoles={portRoles}
          hasAdminAccess={hasAdminAccess}
          hasMarinaAccess={hasMarinaAccess}
          hasResidentialAccess={hasResidentialAccess}
        />

        {/* Collapse toggle */}
        <button
          onClick={toggleSidebar}
          className={cn(
            'absolute top-1/2 -translate-y-1/2 -right-3 z-10',
            'w-6 h-6 rounded-full bg-[#1e2844] border border-[#474e66]',
            'flex items-center justify-center text-[#cdcfd6]',
            'hover:bg-[#3a7bc8] hover:border-[#3a7bc8] hover:text-white transition-colors',
          )}
          aria-label={sidebarCollapsed ? 'Expand sidebar' : 'Collapse sidebar'}
        >
          {sidebarCollapsed ? (
            <ChevronRight className="w-3 h-3" />
          ) : (
            <ChevronLeft className="w-3 h-3" />
          )}
        </button>
      </aside>

      {/* Mobile drawer */}
      <Sheet>
        <SheetTrigger asChild>
          <Button
            variant="ghost"
            size="icon"
            className="md:hidden fixed top-3 left-3 z-50 text-white bg-[#1e2844] hover:bg-[#171f35]"
          >
            <Menu className="w-5 h-5" />
            <span className="sr-only">Open navigation</span>
          </Button>
        </SheetTrigger>
        <SheetContent side="left" className="p-0 w-sidebar border-r-0">
          <SidebarContent
            collapsed={false}
            portSlug={currentPortSlug ?? undefined}
            portRoles={portRoles}
            hasAdminAccess={hasAdminAccess}
            hasMarinaAccess={hasMarinaAccess}
            hasResidentialAccess={hasResidentialAccess}
          />
        </SheetContent>
      </Sheet>
    </>
  );
}