import { NavLink, Navigate, Outlet, Route, Routes, useLocation } from 'react-router-dom'
import { LogOut } from 'lucide-react'
import { useAuth } from './context/AuthContext.jsx'
import { getMainNavItems } from './config/appNav.js'
import LoginScreen from './pages/LoginScreen.jsx'
import SetupScreen from './pages/SetupScreen.jsx'
import HomePage from './pages/HomePage.jsx'
import DialoguePage from './pages/DialoguePage.jsx'
import JournalSpacesPage from './pages/JournalSpacesPage.jsx'
import JournalSpacePage from './pages/JournalSpacePage.jsx'
import JournalDayPage from './pages/JournalDayPage.jsx'
import JournalEditorPage from './pages/JournalEditorPage.jsx'
import JournalSourcePage from './pages/JournalSourcePage.jsx'
import SettingsPage from './pages/SettingsPage.jsx'
import AdminHomePage from './pages/AdminHomePage.jsx'
import AdminUsersPage from './pages/AdminUsersPage.jsx'
import AdminPromptsPage from './pages/AdminPromptsPage.jsx'
import AdminPlaceholdersPage from './pages/AdminPlaceholdersPage.jsx'
import AdminFeaturesPage from './pages/AdminFeaturesPage.jsx'
import AdminDialoguePage from './pages/AdminDialoguePage.jsx'
import AdminProvidersPage from './pages/AdminProvidersPage.jsx'
import RequireAdmin from './layouts/RequireAdmin.jsx'
import AdminShell from './layouts/AdminShell.jsx'
import { UnsavedProvider, useUnsavedChanges } from './context/UnsavedChanges.jsx'

function navItemActive(pathname, item, routerIsActive) {
  if (item.to.startsWith('/admin')) return pathname.startsWith('/admin')
  if (item.to === '/journal') return pathname.startsWith('/journal')
  return routerIsActive
}

function BottomNav({ isAdmin }) {
  const items = getMainNavItems(isAdmin)
  const loc = useLocation()
  return (
    <nav className="bottom-nav">
      {items.map((item) => {
        const Icon = item.icon
        return (
          <NavLink
            key={item.to}
            to={item.to}
            className={({ isActive }) =>
              navItemActive(loc.pathname, item, isActive) ? 'nav-item active' : 'nav-item'
            }
            end={item.to === '/'}
          >
            <Icon size={20} />
            <span>{item.label}</span>
          </NavLink>
        )
      })}
    </nav>
  )
}

function DesktopSidebar({ isAdmin, onLogout, name }) {
  const items = getMainNavItems(isAdmin)
  const loc = useLocation()
  return (
    <aside className="desktop-sidebar">
      <div className="brand">Kanshō</div>
      <nav>
        {items.map((item) => {
          const Icon = item.icon
          return (
            <NavLink
              key={item.to}
              to={item.to}
              className={({ isActive }) =>
                navItemActive(loc.pathname, item, isActive) ? 'nav-item active' : 'nav-item'
              }
              end={item.to === '/'}
            >
              <Icon size={18} />
              <span>{item.label}</span>
            </NavLink>
          )
        })}
      </nav>
      <div className="sidebar-footer">
        <span className="user-name">{name}</span>
        <button type="button" className="ghost" onClick={onLogout}>
          <LogOut size={16} /> Abmelden
        </button>
      </div>
    </aside>
  )
}

function AppShell() {
  const { session, isAdmin, logout } = useAuth()
  const { confirmLeave } = useUnsavedChanges()
  const onLogout = () => {
    if (!confirmLeave()) return
    logout()
  }
  return (
    <div className="app-shell">
      <DesktopSidebar isAdmin={isAdmin} onLogout={onLogout} name={session?.profile?.name} />
      <div className="app-main">
        <header className="mobile-header">
          <strong>Kanshō</strong>
          <button type="button" className="ghost" onClick={onLogout}>Abmelden</button>
        </header>
        <main className="page">
          <Outlet />
        </main>
        <BottomNav isAdmin={isAdmin} />
      </div>
    </div>
  )
}

export default function App() {
  const { loading, needsSetup, session } = useAuth()

  if (loading) {
    return <div className="centered">Lädt …</div>
  }
  if (needsSetup) {
    return <SetupScreen />
  }
  if (!session) {
    return <LoginScreen />
  }

  return (
    <UnsavedProvider>
      <Routes>
        <Route element={<AppShell />}>
          <Route path="/" element={<HomePage />} />
          <Route path="/journal" element={<JournalSpacesPage />} />
          <Route path="/journal/:spaceId" element={<JournalSpacePage />} />
          <Route path="/journal/:spaceId/:dayId" element={<JournalDayPage />} />
          <Route path="/journal/:spaceId/:dayId/entry" element={<JournalEditorPage />} />
          <Route path="/journal/:spaceId/:dayId/source/:conversationId" element={<JournalSourcePage />} />
          <Route path="/settings" element={<SettingsPage />} />
          <Route element={<RequireAdmin />}>
            <Route path="/dialog" element={<DialoguePage />} />
            <Route path="/admin" element={<AdminShell />}>
              <Route index element={<AdminHomePage />} />
              <Route path="users" element={<AdminUsersPage />} />
              <Route path="prompts" element={<AdminPromptsPage />} />
              <Route path="placeholders" element={<AdminPlaceholdersPage />} />
              <Route path="features" element={<AdminFeaturesPage />} />
              <Route path="providers" element={<AdminProvidersPage />} />
              <Route path="dialogue" element={<AdminDialoguePage />} />
            </Route>
          </Route>
        </Route>
        <Route path="*" element={<Navigate to="/" replace />} />
      </Routes>
    </UnsavedProvider>
  )
}