'use client';

import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import { Loader2, Plus, RefreshCw, Shield } from 'lucide-react';
import { useTranslations } from 'next-intl';
import { useRouter } from 'next/navigation';
import { useState } from 'react';
import { toast } from 'sonner';

import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
} from '@/components/ui/alert-dialog';
import { Button } from '@/components/ui/button';
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from '@/components/ui/card';
import { EmptyStateWithBorder } from '@/components/layout/empty';
import { ErrorInline } from '@/components/layout/error';
import { LoadingStateWithBorder } from '@/components/layout/loading';
import type { WAFRule } from '@/lib/services/openflare';
import { WafService } from '@/lib/services/openflare';

import { CreateRuleDialog } from './components/create-rule-dialog';
import { getErrorMessage } from './components/helpers';
import { RuleGroupsTable } from './components/rule-groups-table';

const ruleGroupsQueryKey = ['openflare', 'waf', 'rule-groups'];

export default function WafPage() {
  const t = useTranslations('waf');
  const tCommon = useTranslations('common');
  const router = useRouter();
  const queryClient = useQueryClient();
  const [createOpen, setCreateOpen] = useState(false);
  const [deleteTarget, setDeleteTarget] = useState<WAFRule | null>(null);

  const groupsQuery = useQuery({
    queryKey: ruleGroupsQueryKey,
    queryFn: () => WafService.listRuleGroups(),
  });

  const invalidate = async () => {
    await Promise.all([
      queryClient.invalidateQueries({ queryKey: ruleGroupsQueryKey }),
      queryClient.invalidateQueries({
        queryKey: ['openflare', 'config-versions', 'diff'],
      }),
    ]);
  };

  const createMutation = useMutation({
    mutationFn: (name: string) => WafService.createRule({ name }),
    onSuccess: (rule) => {
      toast.success(t('created'));
      setCreateOpen(false);
      router.push(`/waf/rules/editor?id=${rule.id}`);
    },
    onError: (error) => {
      toast.error(getErrorMessage(error, t('operationFailed')));
    },
  });

  const deleteMutation = useMutation({
    mutationFn: (id: number) => WafService.deleteRuleGroup(id),
    onSuccess: async () => {
      toast.success(t('groupDeleted'));
      setDeleteTarget(null);
      await invalidate();
    },
    onError: (error) => {
      toast.error(getErrorMessage(error, t('operationFailed')));
    },
  });

  const handleRefresh = () => {
    void queryClient.invalidateQueries({ queryKey: ruleGroupsQueryKey });
  };

  const groups = groupsQuery.data ?? [];
  const loading = groupsQuery.isLoading;
  const error = groupsQuery.error ?? null;

  return (
    <div className='w-full py-6 px-1 space-y-6'>
      <div className='flex items-center justify-between gap-3'>
        <div className='flex items-center gap-2'>
          <Shield className='size-5 text-primary' />
          <h1 className='text-2xl font-semibold tracking-tight'>{t('title')}</h1>
        </div>
        <div className='flex items-center gap-2'>
          <Button
            variant='secondary'
            size='sm'
            onClick={() => setCreateOpen(true)}
          >
            <Plus data-icon='inline-start' />
            {t('createRule')}
          </Button>
        </div>
      </div>

      <Card className='border-dashed shadow-none'>
        <CardHeader className='pb-3'>
          <div className='flex items-center justify-between gap-3'>
            <div>
              <CardTitle className='text-base font-semibold'>
                {t('ruleGroups')}
              </CardTitle>
              <CardDescription>{t('ruleGroupsDesc')}</CardDescription>
            </div>
            <Button
              variant='outline'
              size='sm'
              className='h-7 text-xs'
              onClick={handleRefresh}
              disabled={groupsQuery.isFetching}
            >
              {groupsQuery.isFetching ? (
                <Loader2 className='size-3.5 mr-1 animate-spin' />
              ) : (
                <RefreshCw className='size-3.5 mr-1' />
              )}
              {t('refresh')}
            </Button>
          </div>
        </CardHeader>
        <CardContent>
          {loading ? (
            <LoadingStateWithBorder
              icon={Shield}
              description={t('loading')}
            />
          ) : error ? (
            <div className='p-8 border border-dashed rounded-lg'>
              <ErrorInline
                message={getErrorMessage(error, t('operationFailed'))}
                onRetry={handleRefresh}
                className='justify-center'
              />
            </div>
          ) : groups.length === 0 ? (
            <EmptyStateWithBorder
              icon={Shield}
              description={t('empty')}
            />
          ) : (
            <RuleGroupsTable
              groups={groups}
              onEdit={(rule) => router.push(`/waf/rules/editor?id=${rule.id}`)}
              onDelete={setDeleteTarget}
            />
          )}
        </CardContent>
      </Card>

      <CreateRuleDialog
        open={createOpen}
        pending={createMutation.isPending}
        onOpenChange={setCreateOpen}
        onCreate={async (name) => {
          await createMutation.mutateAsync(name);
        }}
      />

      <AlertDialog
        open={Boolean(deleteTarget)}
        onOpenChange={(open) => !open && setDeleteTarget(null)}
      >
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>{t('deleteTitle')}</AlertDialogTitle>
            <AlertDialogDescription>
              {t('deleteDesc', { name: deleteTarget?.name ?? '' })}
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel disabled={deleteMutation.isPending}>
              {tCommon('cancel')}
            </AlertDialogCancel>
            <AlertDialogAction
              className='bg-destructive text-white hover:bg-destructive/90'
              disabled={deleteMutation.isPending}
              onClick={() =>
                deleteTarget && deleteMutation.mutate(deleteTarget.id)
              }
            >
              {deleteMutation.isPending ? t('deleting') : t('confirmDelete')}
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>
    </div>
  );
}