import { Link, NavLink, Outlet, useLocation, useNavigate } from 'react-router-dom'
import { useTranslation } from 'react-i18next'
import type { ReactElement } from 'react'
import { Button } from '@/components/ui/Button'
import { LangSwitcher } from '@/components/layout/LangSwitcher'
import { useLogout, useMe } from '@/hooks/useAuth'

type NavIconName =
  | 'month'
  | 'operations'
  | 'budget'
  | 'imports'
  | 'review'
  | 'analytics'
  | 'accounts'
  | 'settings'

const NAV_ICONS: Record<NavIconName, ReactElement> = {
  month: (
    <>
      <rect x="3" y="4.5" width="18" height="16" rx="2" />
      <path d="M8 2.5v4" />
      <path d="M16 2.5v4" />
      <path d="M3 9.5h18" />
      <path d="M8 14h8" />
    </>
  ),
  operations: (
    <>
      <rect x="3" y="3" width="18" height="18" rx="2" />
      <path d="M3 9h18" />
      <path d="M3 15h18" />
    </>
  ),
  budget: (
    <>
      <path d="M21 12c.552 0 1.005-.449.95-.998a10 10 0 0 0-8.953-8.951c-.55-.055-.998.398-.998.95v8a1 1 0 0 0 1 1z" />
      <path d="M21.21 15.89A10 10 0 1 1 8 2.83" />
    </>
  ),
  imports: (
    <>
      <path d="M22 12h-6l-2 3h-4l-2-3H2" />
      <path d="M5.45 5.11 2 12v6a2 2 0 0 0 2 2h16a2 2 0 0 0 2-2v-6l-3.45-6.89A2 2 0 0 0 16.76 4H7.24a2 2 0 0 0-1.79 1.11z" />
    </>
  ),
  review: (
    <>
      <path d="m3 17 2 2 4-4" />
      <path d="m3 7 2 2 4-4" />
      <path d="M13 6h8" />
      <path d="M13 12h8" />
      <path d="M13 18h8" />
    </>
  ),
  analytics: (
    <>
      <path d="M4 20v-6" />
      <path d="M9.5 20V9" />
      <path d="M15 20v-4" />
      <path d="M20.5 20V7" />
      <path d="m3 12 5-5 4 3 6-6" />
    </>
  ),
  accounts: (
    <>
      <path d="M19 7V4a1 1 0 0 0-1-1H5a2 2 0 0 0 0 4h15a1 1 0 0 1 1 1v4h-3a2 2 0 0 0 0 4h3a1 1 0 0 0 1-1v-2a1 1 0 0 0-1-1" />
      <path d="M3 5v14a2 2 0 0 0 2 2h15a1 1 0 0 0 1-1v-4" />
    </>
  ),
  settings: (
    <>
      <path d="M20 7h-9" />
      <path d="M14 17H5" />
      <circle cx="17" cy="17" r="3" />
      <circle cx="7" cy="7" r="3" />
    </>
  ),
}

function NavIcon({ name }: { name: NavIconName }) {
  return (
    <svg
      className="nav-icon"
      viewBox="0 0 24 24"
      fill="none"
      stroke="currentColor"
      strokeWidth={2}
      strokeLinecap="round"
      strokeLinejoin="round"
      aria-hidden="true"
      focusable="false"
    >
      {NAV_ICONS[name]}
    </svg>
  )
}

const NAV_ITEMS = [
  { to: '/', key: 'nav.month', end: true, icon: 'month' },
  { to: '/operations', key: 'nav.operations', end: false, icon: 'operations' },
  { to: '/budget', key: 'nav.budget', end: false, icon: 'budget' },
  { to: '/imports', key: 'nav.imports', end: false, icon: 'imports' },
  { to: '/review', key: 'nav.review', end: false, icon: 'review' },
  { to: '/analytics', key: 'nav.analytics', end: false, icon: 'analytics' },
  { to: '/accounts', key: 'nav.accounts', end: false, icon: 'accounts' },
  { to: '/settings', key: 'nav.settings', end: false, icon: 'settings' },
] as const

const MOBILE_NAV_ROUTES: readonly string[] = ['/', '/operations', '/budget', '/imports', '/review', '/accounts']
const MOBILE_NAV_ITEMS = NAV_ITEMS.filter((item) => MOBILE_NAV_ROUTES.includes(item.to))

export function AppLayout() {
  const { t, i18n } = useTranslation()
  const me = useMe()
  const logout = useLogout()
  const navigate = useNavigate()
  const location = useLocation()
  const pageKey = location.pathname.split('/').filter(Boolean)[0] ?? 'overview'

  const handleLogout = () =>
    logout.mutate(undefined, {
      onSettled: () => navigate('/login', { replace: true }),
    })

  return (
    <div className="app-shell" lang={i18n.language}>
      <a className="skip-link" href="#main">
        {t('common.skipToContent')}
      </a>
      <aside className="app-sidebar">
        <div className="sidebar-top">
          <Link to="/" className="brand">
            <span className="brand-mark" aria-hidden="true">FS</span>
            <span>FINSPACE</span>
          </Link>
          <div className="space-identity">
            <span>{t('app.financialSpace')}</span>
            <strong>{me.data?.fullName ?? t('app.brand')}</strong>
            <small>{t('app.ownerActive')}</small>
          </div>
        </div>
        <nav className="app-nav" aria-label={t('nav.label')}>
          {NAV_ITEMS.map((item) => (
            <NavLink key={item.to} end={item.end} to={item.to} className="nav-pill">
              <NavIcon name={item.icon} />
              {t(item.key)}
            </NavLink>
          ))}
        </nav>
        <div className="sidebar-footer">
          <p className="sync-state"><span aria-hidden="true" />{t('app.synced')}</p>
          {me.data ? (
            <div className="profile-block" title={me.data.email}>
              <span className="profile-avatar" aria-hidden="true">
                {me.data.fullName.split(/\s+/).map((part) => part[0]).join('').slice(0, 2)}
              </span>
              <span>
                <strong>{me.data.fullName}</strong>
                <small>{me.data.locale.toUpperCase()} · {me.data.timezone}</small>
              </span>
            </div>
          ) : null}
          <div className="sidebar-controls">
            <LangSwitcher />
            <Button variant="ghost" onClick={handleLogout}>{t('auth.logout')}</Button>
          </div>
        </div>
      </aside>
      <header className="mobile-header">
        <Link to="/" className="brand">
          <span className="brand-mark" aria-hidden="true">FS</span>
          <span>FINSPACE</span>
        </Link>
        <LangSwitcher />
      </header>
      <main id="main" className={`app-main view-${pageKey}`}>
        <Outlet />
      </main>
      <nav className="mobile-nav" aria-label={t('nav.label')}>
        {MOBILE_NAV_ITEMS.map((item) => (
          <NavLink key={item.to} end={item.end} to={item.to}>
            <NavIcon name={item.icon} />
            {t(item.key)}
          </NavLink>
        ))}
      </nav>
    </div>
  )
}