import { useState } from 'react'
import { Link, useLocation, useNavigate } from 'react-router-dom'
import { useAuth } from '../context/AuthContext'
import {
  IconTicket,
  IconUsers,
  IconTargetArrow,
  IconReportMoney,
  IconFolders,
  IconCalendar,
  IconRoute,
  IconLayoutDashboard,
  IconSettings,
  IconLogout,
  IconLayoutSidebarLeftCollapse,
  IconLayoutSidebarLeftExpand,
} from '@tabler/icons-react'

export default function Sidebar() {
  const { user, logout, isAdmin } = useAuth()
  const navigate = useNavigate()
  const location = useLocation()
  const [collapsed, setCollapsed] = useState(false)

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

  const groups = [
    {
      label: 'Betrieb',
      links: [
        { label: 'Tickets', href: '/tickets', icon: <IconTicket /> },
        { label: 'Planboard', href: '/planboard', icon: <IconCalendar /> },
        { label: 'Roadmaps', href: '/roadmaps', icon: <IconRoute /> },
        { label: 'Projekte', href: '/projects', icon: <IconFolders /> },
      ],
    },
    {
      label: 'CRM',
      links: [
        { label: 'Kunden', href: '/customers', icon: <IconUsers /> },
        { label: 'Leads', href: '/leads', icon: <IconTargetArrow /> },
      ],
    },
    {
      label: 'Finanzen',
      links: [{ label: 'Finanzen', href: '/finance', icon: <IconReportMoney /> }],
    },
    {
      label: 'Auswertung',
      links: [
        { label: 'Dashboard', href: '/dashboard', icon: <IconLayoutDashboard /> },
      ],
    },
    {
      label: 'System',
      links: [
        ...(isAdmin ? [{ label: 'Admin', href: '/admin', icon: <IconSettings /> }] : []),
      ],
    },
  ]

  const isActive = (href) =>
    location.pathname === href || location.pathname.startsWith(href + '/')

  return (
    <aside className={`side ${collapsed ? 'collapsed' : ''}`}>
      <div className="side-head">
        <Link to="/" className="side-logo" title="Webklar">W</Link>
        <div className="side-brand">
          Webklar
          <small>Ticket-Plattform</small>
        </div>
      </div>

      <nav className="side-nav">
        {/* Gruppen ohne Eintrag (System fuer Nicht-Admins) nicht anzeigen */}
        {groups.filter((group) => group.links.length > 0).map((group) => (
          <div className="side-group" key={group.label}>
            <div className="side-group-label">{group.label}</div>
            {group.links.map((link) => (
              <Link
                key={link.href}
                to={link.href}
                className={`side-link ${isActive(link.href) ? 'active' : ''}`}
                title={link.label}
              >
                {link.icon}
                <span className="side-link-label">{link.label}</span>
              </Link>
            ))}
          </div>
        ))}
      </nav>

      <div className="side-foot">
        {user && (
          <div className="side-link" title={user.name || user.email} style={{ cursor: 'default' }}>
            <div className="side-logo" style={{ width: 28, height: 28, fontSize: 12, background: 'linear-gradient(135deg,#667eea,#764ba2)' }}>
              {(user.name || user.email || '?').charAt(0).toUpperCase()}
            </div>
            <span className="side-link-label text-ellipsis">{user.name || user.email}</span>
          </div>
        )}
        <button className="side-toggle" onClick={handleLogout} title="Logout">
          <IconLogout size={20} />
          <span className="side-link-label">Logout</span>
        </button>
        <button className="side-toggle" onClick={() => setCollapsed((c) => !c)} title="Menue ein-/ausklappen">
          {collapsed ? <IconLayoutSidebarLeftExpand size={20} /> : <IconLayoutSidebarLeftCollapse size={20} />}
          <span className="side-link-label">Einklappen</span>
        </button>
      </div>
    </aside>
  )
}