import React from 'react';
import AdminLayout from '../../layouts/AdminLayout';
import { Box, Heading, HStack, VStack, Button, Select, Input, Table, Thead, Tbody, Tr, Th, Td, Text, Badge, IconButton, useToast, Modal, ModalOverlay, ModalContent, ModalHeader, ModalBody, ModalFooter, ModalCloseButton, useDisclosure, FormControl, FormLabel, NumberInput, NumberInputField, Switch } from '@chakra-ui/react';
import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import { adminListComments, adminUpdateCommentStatus, adminBanUser, adminListUnbanRequests, adminResolveUnban } from '../../services/admin/comments';
import { deleteComment } from '../../services/comments';
import { FiTrash2 } from 'react-icons/fi';

const CommentsAdminPage: React.FC = () => {
  const [status, setStatus] = React.useState<string>('');
  const [targetType, setTargetType] = React.useState<string>('');
  const [targetId, setTargetId] = React.useState<string>('');
  const [userId, setUserId] = React.useState<string>('');
  const [page, setPage] = React.useState<number>(1);
  const [reportedOnly, setReportedOnly] = React.useState<boolean>(false);
  const toast = useToast();
  const qc = useQueryClient();

  const listQ = useQuery({
    queryKey: ['admin-comments', { status, targetType, targetId, userId, page }],
    queryFn: () => adminListComments({ status: status as any, target_type: targetType, target_id: targetId, user_id: userId, page, page_size: 50 }),
    keepPreviousData: true,
  });

  const unbanQ = useQuery({
    queryKey: ['admin-unban-requests'],
    queryFn: adminListUnbanRequests,
  });

  const updateStatusMut = useMutation({
    mutationFn: (args: { id: number; s: 'visible'|'hidden' }) => adminUpdateCommentStatus(args.id, args.s),
    onSuccess: async () => { await qc.invalidateQueries({ queryKey: ['admin-comments'] }); },
  });
  const deleteMut = useMutation({
    mutationFn: (id: number) => deleteComment(id),
    onSuccess: async () => { await qc.invalidateQueries({ queryKey: ['admin-comments'] }); toast({ status: 'success', title: 'Smazáno' }); },
  });

  const [banUserId, setBanUserId] = React.useState<number | null>(null);
  const banModal = useDisclosure();
  const [banReason, setBanReason] = React.useState<string>('Porušení pravidel diskuse');
  const [banHours, setBanHours] = React.useState<number>(0);
  const banMut = useMutation({
    mutationFn: () => adminBanUser(banUserId || 0, banReason, banHours),
    onSuccess: async () => { banModal.onClose(); setBanUserId(null); toast({ status: 'success', title: 'Uživatel zablokován' }); },
  });

  const resolveUnbanMut = useMutation({
    mutationFn: (args: { id: number; action: 'approve'|'reject' }) => adminResolveUnban(args.id, args.action),
    onSuccess: async () => { await qc.invalidateQueries({ queryKey: ['admin-unban-requests'] }); toast({ status: 'success', title: 'Vyřízeno' }); },
  });

  const itemsAll = listQ.data?.items || [];
  const items = React.useMemo(() => {
    if (!reportedOnly) return itemsAll;
    return itemsAll.filter((c: any) => (c as any).reports && (c as any).reports > 0);
  }, [itemsAll, reportedOnly]);

  return (
    <AdminLayout>
      <Box>
        <Heading size="md" mb={4}>Komentáře (moderace)</Heading>
        <VStack align="stretch" spacing={3} mb={4}>
          <HStack>
            <Select placeholder="Status" value={status} onChange={(e) => { setStatus(e.target.value); setPage(1); }} maxW="200px">
              <option value="visible">Viditelné</option>
              <option value="hidden">Skryté</option>
            </Select>
            <Select placeholder="Typ cíle" value={targetType} onChange={(e) => { setTargetType(e.target.value); setPage(1); }} maxW="220px">
              <option value="article">Článek</option>
              <option value="event">Aktivita</option>
              <option value="gallery_album">Galerie</option>
              <option value="youtube_video">YouTube video</option>
            </Select>
            <Input placeholder="Target ID" value={targetId} onChange={(e) => { setTargetId(e.target.value); setPage(1); }} maxW="200px" />
            <Input placeholder="User ID" value={userId} onChange={(e) => { setUserId(e.target.value); setPage(1); }} maxW="200px" />
            <HStack>
              <Text fontSize="sm" color="gray.500">Jen nahlášené</Text>
              <Switch isChecked={reportedOnly} onChange={(e)=>setReportedOnly(e.target.checked)} />
            </HStack>
          </HStack>
        </VStack>

        <Box borderWidth="1px" borderRadius="md" overflowX="auto">
          <Table size="sm">
            <Thead>
              <Tr>
                <Th>ID</Th>
                <Th>Uživatel</Th>
                <Th>Cíl</Th>
                <Th>Obsah</Th>
                <Th>Spam</Th>
                <Th>Hlášení</Th>
                <Th>Status</Th>
                <Th>Akce</Th>
              </Tr>
            </Thead>
            <Tbody>
              {items.map((c) => (
                <Tr key={c.id}>
                  <Td>#{c.id}</Td>
                  <Td>#{c.user?.id} {c.user?.first_name} {c.user?.last_name}</Td>
                  <Td><Badge>{c.target_type}</Badge> <Text as="span">{c.target_id}</Text></Td>
                  <Td maxW="420px"><Text noOfLines={2}>{c.content}</Text></Td>
                  <Td>{(c as any).spam_score ? <Badge colorScheme={(c as any).spam_score > 0.5 ? 'orange' : 'green'}>{(c as any).spam_score.toFixed(2)}</Badge> : '-'}</Td>
                  <Td>{(c as any).reports ? <Badge colorScheme={(c as any).reports > 2 ? 'red' : 'yellow'}>{(c as any).reports}</Badge> : '-'}</Td>
                  <Td>
                    <HStack>
                      <Button size="xs" variant={c.status === 'visible' ? 'solid' : 'outline'} onClick={() => updateStatusMut.mutate({ id: c.id, s: 'visible' })}>Viditelné</Button>
                      <Button size="xs" variant={c.status === 'hidden' ? 'solid' : 'outline'} onClick={() => updateStatusMut.mutate({ id: c.id, s: 'hidden' })}>Skryté</Button>
                    </HStack>
                  </Td>
                  <Td>
                    <HStack>
                      <IconButton aria-label="Smazat" size="xs" icon={<FiTrash2 />} onClick={() => deleteMut.mutate(c.id)} />
                      <Button size="xs" variant="outline" onClick={() => { setBanUserId(c.user?.id as any); banModal.onOpen(); }}>Ban</Button>
                    </HStack>
                  </Td>
                </Tr>
              ))}
            </Tbody>
          </Table>
        </Box>

        <HStack mt={3} justify="space-between">
          <Text fontSize="sm" color="gray.500">Stránka {page} • {listQ.data?.total || 0} komentářů</Text>
          <HStack>
            <Button size="sm" variant="outline" onClick={() => setPage(p => Math.max(1, p - 1))} isDisabled={page <= 1}>Předchozí</Button>
            <Button size="sm" variant="outline" onClick={() => setPage(p => p + 1)} isDisabled={(itemsAll.length === 0) || ((itemsAll.length < 50) && (listQ.data?.total || 0) <= (page * 50))}>Další</Button>
          </HStack>
        </HStack>

        <Heading size="sm" mt={6} mb={2}>Žádosti o odblokování</Heading>
        <Box borderWidth="1px" borderRadius="md" overflowX="auto">
          <Table size="sm">
            <Thead>
              <Tr>
                <Th>ID</Th>
                <Th>Uživatel</Th>
                <Th>Text</Th>
                <Th>Status</Th>
                <Th>Akce</Th>
              </Tr>
            </Thead>
            <Tbody>
              {(unbanQ.data?.items || []).map((r) => (
                <Tr key={r.id}>
                  <Td>#{r.id}</Td>
                  <Td>#{r.user_id}</Td>
                  <Td maxW="480px"><Text noOfLines={2}>{r.message}</Text></Td>
                  <Td><Badge>{r.status}</Badge></Td>
                  <Td>
                    <HStack>
                      <Button size="xs" colorScheme="green" variant="outline" onClick={() => resolveUnbanMut.mutate({ id: r.id, action: 'approve' })}>Povolit</Button>
                      <Button size="xs" colorScheme="red" variant="outline" onClick={() => resolveUnbanMut.mutate({ id: r.id, action: 'reject' })}>Zamítnout</Button>
                    </HStack>
                  </Td>
                </Tr>
              ))}
            </Tbody>
          </Table>
        </Box>

        {/* Ban modal */}
        <Modal isOpen={banModal.isOpen} onClose={banModal.onClose} isCentered>
          <ModalOverlay />
          <ModalContent>
            <ModalHeader>Zablokovat uživatele #{banUserId}</ModalHeader>
            <ModalCloseButton />
            <ModalBody>
              <VStack align="stretch" spacing={3}>
                <FormControl>
                  <FormLabel>Důvod</FormLabel>
                  <Input value={banReason} onChange={(e) => setBanReason(e.target.value)} />
                </FormControl>
                <FormControl>
                  <FormLabel>Doba (hodiny) – 0 = trvale</FormLabel>
                  <NumberInput min={0} value={banHours} onChange={(v) => setBanHours(Number(v) || 0)}>
                    <NumberInputField />
                  </NumberInput>
                </FormControl>
                <HStack>
                  <Text fontSize="sm" color="gray.500">Rychlá volba:</Text>
                  <Button size="xs" variant="outline" onClick={()=>setBanHours(24)}>24h</Button>
                  <Button size="xs" variant="outline" onClick={()=>setBanHours(24*7)}>7 dní</Button>
                  <Button size="xs" variant="outline" onClick={()=>setBanHours(0)}>Trvale</Button>
                </HStack>
              </VStack>
            </ModalBody>
            <ModalFooter>
              <HStack>
                <Button onClick={banModal.onClose}>Zrušit</Button>
                <Button colorScheme="red" isLoading={banMut.isPending} onClick={() => banMut.mutate()}>Zablokovat</Button>
              </HStack>
            </ModalFooter>
          </ModalContent>
        </Modal>
      </Box>
    </AdminLayout>
  );
};

export default CommentsAdminPage;