import React, { useEffect, useState } from 'react';
import {
  Box,
  Button,
  Container,
  FormControl,
  FormLabel,
  Input,
  Tab,
  TabList,
  TabPanel,
  TabPanels,
  Tabs,
  Heading,
  Text,
  useToast,
  VStack,
  HStack,
  Link as ChakraLink,
} from '@chakra-ui/react';
import { useAuth } from '../contexts/AuthContext';
import api from '../services/api';

const SemiAdminPage: React.FC = () => {
  const { user, updateUser } = useAuth();
  const splitName = (full?: string) => {
    const v = String(full || '').trim();
    if (!v) return { fn: '', ln: '' };
    const parts = v.split(/\s+/);
    if (parts.length === 1) return { fn: parts[0], ln: '' };
    return { fn: parts[0], ln: parts.slice(1).join(' ') };
  };
  const init = splitName(user?.name);
  const [firstName, setFirstName] = useState(init.fn);
  const [lastName, setLastName] = useState(init.ln);
  const [isSaving, setIsSaving] = useState(false);
  const [prefsToken, setPrefsToken] = useState<string>('');
  const toast = useToast();

  useEffect(() => {
    const s = splitName(user?.name);
    setFirstName(s.fn);
    setLastName(s.ln);
  }, [user?.name]);

  useEffect(() => {
    (async () => {
      try {
        const res = await api.get('/newsletter/token/me');
        setPrefsToken(res.data?.token || '');
      } catch {}
    })();
  }, []);

  const handleSave = async (e: React.FormEvent) => {
    e.preventDefault();
    setIsSaving(true);
    try {
      const res = await api.put('/me', { first_name: firstName, last_name: lastName });
      const updated = res.data?.user;
      if (updated) {
        const n = `${updated.first_name || firstName} ${updated.last_name || lastName}`.trim();
        updateUser({ name: n });
      }
      toast({ title: 'Uloženo', description: 'Osobní údaje byly aktualizovány.', status: 'success', duration: 3000 });
    } catch (err: any) {
      toast({ title: 'Chyba', description: err?.response?.data?.error || 'Nelze uložit změny', status: 'error' });
    } finally {
      setIsSaving(false);
    }
  };

  const prefsUrl = prefsToken ? `/newsletter/preferences?token=${encodeURIComponent(prefsToken)}` : '';

  return (
    <Container maxW="5xl" py={8}>
      <Heading size="lg" mb={6}>Fan zóna</Heading>
      <Tabs colorScheme="blue" isFitted variant="enclosed">
        <TabList>
          <Tab>Osobní údaje</Tab>
          <Tab>Newsletter</Tab>
        </TabList>
        <TabPanels>
          <TabPanel>
            <Box as="form" onSubmit={handleSave} maxW="lg">
              <VStack align="stretch" spacing={4}>
                <FormControl>
                  <FormLabel>Jméno</FormLabel>
                  <Input value={firstName} onChange={(e) => setFirstName(e.target.value)} placeholder="Jméno" />
                </FormControl>
                <FormControl>
                  <FormLabel>Příjmení</FormLabel>
                  <Input value={lastName} onChange={(e) => setLastName(e.target.value)} placeholder="Příjmení" />
                </FormControl>
                <HStack>
                  <Button type="submit" colorScheme="blue" isLoading={isSaving}>Uložit</Button>
                </HStack>
              </VStack>
            </Box>
          </TabPanel>
          <TabPanel>
            <VStack align="start" spacing={4}>
              <Text>Spravujte předvolby newsletteru nebo se odhlaste.</Text>
              {prefsUrl ? (
                <Button as={ChakraLink} href={prefsUrl} colorScheme="blue">Otevřít nastavení newsletteru</Button>
              ) : (
                <Text>Načítám odkaz na nastavení…</Text>
              )}
            </VStack>
          </TabPanel>
        </TabPanels>
      </Tabs>
    </Container>
  );
};

export default SemiAdminPage;