import { Link } from '@tanstack/react-router'
import {
  Box,
  Burger,
  Container,
  Drawer,
  Group,
  Menu,
  SimpleGrid,
  Stack,
  Text,
  UnstyledButton,
} from '@pikku/mantine/core'
import { useDisclosure } from '@mantine/hooks'
import { m } from '@/i18n/messages'
import { useLocale, getLocale, type Locale } from '@/i18n/config'
import { asI18n } from '@pikku/react'
import { ChevronDown, Facebook, Instagram, Mail, Phone } from 'lucide-react'
import { BrandMark } from './Brand'

/**
 * Public-site chrome that mirrors seminarhof-drawehn.de (header + footer) so the
 * app's anonymous public pages (availability / events / enquiry) feel like one
 * cohesive website with the marketing site. Marketing destinations link out to
 * the live WordPress site; the app's own pages (events) stay internal.
 *
 * Nav labels are kept in German on purpose — they're the marketing site's
 * canonical labels (brand chrome), not app content. The DE/EN switcher toggles
 * the app's i18n language, which drives the page body, not these labels.
 *
 * Social/contact glyphs use lucide-react (the app's icon set) — the closest
 * equivalent to the live site's Font Awesome icons, not pixel-identical.
 */

const SITE = 'https://seminarhof-drawehn.de'
const PHONE_HREF = 'tel:+491724695132'
const PHONE_LABEL = '+49 172 4695132'
const EMAIL = 'info@seminarhof-drawehn.de'
const TAGLINE = 'Retreats · Fortbildungen · Workation'

type NavChild = { label: string; href: string; internal?: boolean }
type NavEntry = { label: string; href: string; internal?: boolean; children?: NavChild[] }

const ext = (path: string) => `${SITE}${path}`

const LEFT_NAV: NavEntry[] = [
  {
    label: 'Unser Seminarhof',
    href: ext('/seminarhof/'),
    children: [
      { label: 'Seminarräume', href: ext('/seminarhof/') },
      { label: 'Verpflegung', href: ext('/verpflegung/') },
      { label: 'Unterkunft', href: ext('/unterkunft/') },
      { label: 'Holistic Bodywork', href: ext('/holistic-bodywork/') },
    ],
  },
  { label: 'Anreise', href: ext('/anreise/') },
  { label: 'Galerie', href: ext('/galerie/') },
  { label: 'FAQ', href: ext('/faq/') },
]

const RIGHT_NAV: NavEntry[] = [
  { label: 'Veranstaltungen', href: '/events', internal: true },
  {
    label: 'Kontakt',
    href: ext('/kontakt/'),
    children: [
      { label: 'Kontakt', href: ext('/kontakt/') },
      { label: 'Über uns', href: ext('/ueber-uns/') },
      { label: 'Gästebuch', href: ext('/gaestebuch/') },
      { label: 'Jobs', href: ext('/jobs/') },
    ],
  },
  { label: 'Downloads', href: ext('/downloads/') },
]

const FOOTER_COLUMNS: { heading: string; links: NavChild[] }[] = [
  {
    heading: 'Unser Seminarhof',
    links: [
      { label: 'Seminarräume', href: ext('/seminarhof/') },
      { label: 'Verpflegung', href: ext('/verpflegung/') },
      { label: 'Unterkunft', href: ext('/unterkunft/') },
    ],
  },
  {
    heading: 'Angebote',
    links: [
      { label: 'Veranstaltungen', href: '/events', internal: true },
      { label: 'Holistic Bodywork', href: ext('/holistic-bodywork/') },
      { label: 'Jobs', href: ext('/jobs/') },
    ],
  },
  {
    heading: 'Info',
    links: [
      { label: 'FAQ', href: ext('/faq/') },
      { label: 'Kontakt', href: ext('/kontakt/') },
      { label: 'Downloads', href: ext('/downloads/') },
    ],
  },
  {
    heading: 'Rechtliches',
    links: [
      { label: 'Impressum', href: ext('/impressum/') },
      { label: 'Datenschutz', href: ext('/datenschutz/') },
    ],
  },
]

const NAV_ITEM_STYLE: React.CSSProperties = {
  color: '#ffffff',
  fontFamily: "'Open Sans', sans-serif",
  fontSize: '14.4px',
  fontWeight: 400,
  textDecoration: 'none',
  lineHeight: 1,
  cursor: 'pointer',
  background: 'none',
  border: 'none',
  padding: 0,
}

/** A single top-level nav entry: plain external/internal link, or a hover menu. */
function NavTopItem({ entry, onNavigate }: { entry: NavEntry; onNavigate?: () => void }) {
  if (entry.children) {
    return (
      <Menu trigger="hover" position="bottom-start" offset={14} withinPortal shadow="md" radius="sm">
        <Menu.Target>
          <Group gap={4} wrap="nowrap" style={{ ...NAV_ITEM_STYLE }}>
            <span>{entry.label}</span>
            <ChevronDown size={14} strokeWidth={2.5} />
          </Group>
        </Menu.Target>
        <Menu.Dropdown
          style={{ background: 'var(--brand-plum)', border: 'none', padding: 4 }}
        >
          {entry.children.map((c) => {
            const itemStyle = { color: '#ffffff', fontFamily: "'Open Sans', sans-serif", fontSize: '14px' }
            return c.internal ? (
              <Menu.Item key={c.label} component={Link} to={c.href} onClick={onNavigate} style={itemStyle}>
                {asI18n(`${c.label}`)}
              </Menu.Item>
            ) : (
              <Menu.Item key={c.label} component="a" href={c.href} onClick={onNavigate} style={itemStyle}>
                {asI18n(`${c.label}`)}
              </Menu.Item>
            )
          })}
        </Menu.Dropdown>
      </Menu>
    )
  }
  if (entry.internal) {
    return (
      <Link to={entry.href} onClick={onNavigate} style={NAV_ITEM_STYLE}>
        {entry.label}
      </Link>
    )
  }
  return (
    <a href={entry.href} onClick={onNavigate} style={NAV_ITEM_STYLE}>
      {entry.label}
    </a>
  )
}

function LanguageSwitcher() {
  const { setLocale } = useLocale()
  const current = (getLocale() || 'de').slice(0, 2).toUpperCase()
  return (
    <Menu trigger="hover" position="bottom-end" offset={14} withinPortal shadow="md" radius="sm">
      <Menu.Target>
        <Group gap={4} wrap="nowrap" style={NAV_ITEM_STYLE}>
          <span>{current}</span>
          <ChevronDown size={14} strokeWidth={2.5} />
        </Group>
      </Menu.Target>
      <Menu.Dropdown style={{ background: 'var(--brand-plum)', border: 'none', padding: 4 }}>
        {['de', 'en'].map((lng) => (
          <Menu.Item
            key={lng}
            onClick={() => setLocale(lng as Locale)}
            style={{ color: '#ffffff', fontFamily: "'Open Sans', sans-serif", fontSize: '14px' }}
          >
            {asI18n(`${lng.toUpperCase()}`)}
          </Menu.Item>
        ))}
      </Menu.Dropdown>
    </Menu>
  )
}

function SocialIcons({ color = '#ffffff', size = 18 }: { color?: string; size?: number }) {
  const link = { color, display: 'flex' } as React.CSSProperties
  return (
    <Group gap="md" wrap="nowrap">
      <a href={`mailto:${EMAIL}`} aria-label="E-Mail" style={link}>
        <Mail size={size} />
      </a>
      <a href="https://www.facebook.com/seminarhofdrawehn" aria-label="Facebook" target="_blank" rel="noreferrer" style={link}>
        <Facebook size={size} />
      </a>
      <a href="https://www.instagram.com/seminarhof_drawehn" aria-label="Instagram" target="_blank" rel="noreferrer" style={link}>
        <Instagram size={size} />
      </a>
    </Group>
  )
}

const BRAND_STYLE: React.CSSProperties = {
  fontFamily: "'Nunito', sans-serif",
  fontWeight: 500,
  fontSize: '32px',
  color: '#ffffff',
  textDecoration: 'none',
  lineHeight: 1,
  whiteSpace: 'nowrap',
}

export function SeminarhofHeader() {
  useLocale()
  const [opened, { toggle, close }] = useDisclosure(false)

  return (
    // display:contents so the sticky nav row below isn't trapped in this short
    // header's containing block — its sticky context becomes the full-height
    // MarketingShell column, giving page-wide sticky behaviour.
    <Box component="header" style={{ display: 'contents' }}>
      {/* Top utility bar */}
      <Box style={{ background: 'var(--brand-plum-dark)' }} py={6} visibleFrom="md">
        <Container size="xl" w="100%">
          <Group justify="space-between" wrap="nowrap">
            <Text style={{ color: 'var(--brand-pink)', fontFamily: "'Open Sans', sans-serif", fontSize: 12 }}>
              {asI18n(`${TAGLINE}`)}
            </Text>
            <Group gap="lg" wrap="nowrap" style={{ color: 'var(--brand-pink)' }}>
              <a href={PHONE_HREF} style={{ color: 'var(--brand-pink)', display: 'flex', alignItems: 'center', gap: 6, fontFamily: "'Open Sans', sans-serif", fontSize: 12, textDecoration: 'none' }}>
                <Phone size={13} /> {PHONE_LABEL}
              </a>
              <a href={`mailto:${EMAIL}`} style={{ color: 'var(--brand-pink)', display: 'flex', alignItems: 'center', gap: 6, fontFamily: "'Open Sans', sans-serif", fontSize: 12, textDecoration: 'none' }}>
                <Mail size={13} /> {EMAIL}
              </a>
              <SocialIcons color="var(--brand-pink)" size={14} />
            </Group>
          </Group>
        </Container>
      </Box>

      {/* Sticky nav row */}
      <Box
        style={{
          background: 'rgba(136, 85, 127, 0.95)',
          position: 'sticky',
          top: 0,
          zIndex: 100,
          backdropFilter: 'blur(2px)',
        }}
      >
        <Container size="xl" w="100%" style={{ position: 'relative' }}>
          <Group h={74} justify="space-between" wrap="nowrap">
            {/* Left group (desktop) */}
            <Group gap="lg" wrap="nowrap" visibleFrom="md">
              {LEFT_NAV.map((e) => (
                <NavTopItem key={e.label} entry={e} />
              ))}
            </Group>

            {/* Mobile burger */}
            <Burger
              opened={opened}
              onClick={toggle}
              hiddenFrom="md"
              color="#ffffff"
              size="sm"
              aria-label="Menu"
            />

            {/* Mobile brand — in-flow so it can't overlap the burger / switcher */}
            <Box hiddenFrom="md" style={{ flex: 1, minWidth: 0, padding: '0 8px' }}>
              <Link
                to="/"
                style={{
                  ...BRAND_STYLE,
                  fontSize: 20,
                  display: 'block',
                  textAlign: 'center',
                  overflow: 'hidden',
                  textOverflow: 'ellipsis',
                }}
              >
                Seminarhof Drawehn
              </Link>
            </Box>

            {/* Right group (desktop) */}
            <Group gap="lg" wrap="nowrap" visibleFrom="md">
              {RIGHT_NAV.map((e) => (
                <NavTopItem key={e.label} entry={e} />
              ))}
              <LanguageSwitcher />
            </Group>

            {/* Mobile: language switcher stays visible on the right */}
            <Box hiddenFrom="md">
              <LanguageSwitcher />
            </Box>
          </Group>

          {/* Centered brand (desktop) — absolutely positioned so it stays
              centred regardless of the left/right group widths. On mobile the
              in-flow brand above is used instead, to avoid overlap. */}
          <Box
            visibleFrom="md"
            style={{
              position: 'absolute',
              top: 0,
              left: '50%',
              transform: 'translateX(-50%)',
              height: 74,
              display: 'flex',
              alignItems: 'center',
              pointerEvents: 'none',
            }}
          >
            <Link to="/" style={{ ...BRAND_STYLE, pointerEvents: 'auto' }}>
              Seminarhof Drawehn
            </Link>
          </Box>
        </Container>
      </Box>

      {/* Mobile drawer */}
      <Drawer
        opened={opened}
        onClose={close}
        size="80%"
        position="right"
        title={m.common__brand__name()}
        styles={{
          header: { background: 'var(--brand-plum)' },
          title: { color: '#ffffff', fontFamily: "'Nunito', sans-serif", fontWeight: 600 },
          close: { color: '#ffffff' },
          content: { background: 'var(--brand-plum)' },
          body: { background: 'var(--brand-plum)' },
        }}
      >
        <Stack gap="md" pt="md">
          {[...LEFT_NAV, ...RIGHT_NAV].map((e) =>
            e.children ? (
              <Stack key={e.label} gap={6}>
                <Text style={{ color: 'var(--brand-pink)', fontFamily: "'Open Sans', sans-serif", fontSize: 13, textTransform: 'uppercase', letterSpacing: '0.05em' }}>
                  {asI18n(`${e.label}`)}
                </Text>
                {e.children.map((c) => (
                  <DrawerLink key={c.label} child={c} onNavigate={close} indent />
                ))}
              </Stack>
            ) : (
              <DrawerLink key={e.label} child={e} onNavigate={close} />
            )
          )}
        </Stack>
      </Drawer>
    </Box>
  )
}

function DrawerLink({
  child,
  onNavigate,
  indent,
}: {
  child: NavChild
  onNavigate: () => void
  indent?: boolean
}) {
  const style: React.CSSProperties = {
    color: '#ffffff',
    fontFamily: "'Open Sans', sans-serif",
    fontSize: 16,
    textDecoration: 'none',
    paddingLeft: indent ? 12 : 0,
  }
  return child.internal ? (
    <Link to={child.href} onClick={onNavigate} style={style}>
      {child.label}
    </Link>
  ) : (
    <a href={child.href} onClick={onNavigate} style={style}>
      {child.label}
    </a>
  )
}

export function SeminarhofFooter() {
  useLocale()
  const year = new Date().getFullYear()
  const footerLinkStyle: React.CSSProperties = {
    color: '#ffffff',
    fontFamily: "'Open Sans', sans-serif",
    fontSize: 15,
    textDecoration: 'none',
  }
  return (
    <Box component="footer" mt="auto">
      {/* Link columns band */}
      <Box style={{ background: 'var(--brand-plum)' }} py={48}>
        <Container size="xl" w="100%">
          <SimpleGrid cols={{ base: 1, sm: 2, md: 4 }} spacing={40}>
            {FOOTER_COLUMNS.map((col) => (
              <Stack key={col.heading} gap="sm">
                <Text
                  style={{
                    color: 'var(--brand-pink)',
                    fontFamily: "'Open Sans', sans-serif",
                    fontSize: 14.4,
                    fontWeight: 400,
                    textTransform: 'uppercase',
                    letterSpacing: '0.05em',
                  }}
                >
                  {asI18n(`${col.heading}`)}
                </Text>
                {col.links.map((l) =>
                  l.internal ? (
                    <Link key={l.label} to={l.href} style={footerLinkStyle}>
                      {l.label}
                    </Link>
                  ) : (
                    <a key={l.label} href={l.href} style={footerLinkStyle}>
                      {l.label}
                    </a>
                  )
                )}
              </Stack>
            ))}
          </SimpleGrid>
        </Container>
      </Box>

      {/* Copyright band */}
      <Box style={{ background: 'var(--brand-plum-dark)' }} py={20}>
        <Container size="xl" w="100%" style={{ position: 'relative' }}>
          <Group justify="space-between" wrap="nowrap">
            <Text style={{ color: '#ffffff', fontFamily: "'Nunito', sans-serif", fontSize: 22, fontWeight: 400 }}>
              {asI18n(`© ${year} `)}{m.common__brand__name()}
            </Text>
            <SocialIcons color="#ffffff" size={20} />
          </Group>
          {/* Centered wheel logo */}
          <Box
            style={{
              position: 'absolute',
              top: '50%',
              left: '50%',
              transform: 'translate(-50%, -50%)',
              display: 'flex',
              alignItems: 'center',
            }}
            visibleFrom="sm"
          >
            <BrandMark variant="white" size={56} />
          </Box>
        </Container>
      </Box>
    </Box>
  )
}