'use client';

import { useEffect, useMemo } from 'react';
import { zodResolver } from '@hookform/resolvers/zod';
import { useQuery } from '@tanstack/react-query';
import { useForm } from 'react-hook-form';
import { z } from 'zod';

import {
  Form,
  FormControl,
  FormDescription,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from '@/components/ui/form';
import { Input } from '@/components/ui/input';
import { Switch } from '@/components/ui/switch';
import type { ProxyRouteItem } from '@/lib/services/openflare';
import { zoneQueryKey, ZoneService } from '@/lib/services/openflare';

import { useTranslations } from 'next-intl';

import { listAllZoneDomains } from '../../components/helpers';
import { ZoneDomainSelector } from '../../components/zone-domain-selector';
import { proxyRouteFormIds } from '../helpers';
import { useRouteSectionSave } from '../hooks/use-route-section-save';
import { SectionShell } from './section-shell';

type DomainSettingsValues = {
  site_name: string;
  zone_domain_ids: number[];
  enabled: boolean;
  redirect_http: boolean;
};

interface DomainSectionProps {
  route: ProxyRouteItem;
  onRouteUpdate: (route: ProxyRouteItem) => void;
  onSavingChange?: (saving: boolean) => void;
}

export function DomainSection({
  route,
  onRouteUpdate,
  onSavingChange,
}: DomainSectionProps) {
  const t = useTranslations('proxyRoutes');
  const domainSettingsSchema = z.object({
    site_name: z
      .string()
      .trim()
      .min(1, t('validation.enterSiteId'))
      .max(255, t('validation.siteNameTooLong')),
    zone_domain_ids: z
      .array(z.number().int().positive())
      .min(1, t('validation.selectAtLeastOneDomain')),
    enabled: z.boolean(),
    redirect_http: z.boolean(),
  });
  const { saving, save } = useRouteSectionSave(
    route,
    onRouteUpdate,
    onSavingChange,
  );

  const zonesQuery = useQuery({
    queryKey: zoneQueryKey,
    queryFn: () => ZoneService.list(),
  });

  const domainsQuery = useQuery({
    queryKey: [...zoneQueryKey, 'all-domains'],
    queryFn: () => listAllZoneDomains(),
  });

  const form = useForm<DomainSettingsValues>({
    resolver: zodResolver(domainSettingsSchema),
    defaultValues: {
      site_name: route.site_name,
      zone_domain_ids: route.zone_domain_ids ?? [],
      enabled: route.enabled,
      redirect_http: route.redirect_http,
    },
  });

  useEffect(() => {
    form.reset({
      site_name: route.site_name,
      zone_domain_ids: route.zone_domain_ids ?? [],
      enabled: route.enabled,
      redirect_http: route.redirect_http,
    });
  }, [form, route]);

  const selectedIDs = form.watch('zone_domain_ids');
  const selectedDomains = useMemo(() => {
    const fromApi = domainsQuery.data ?? [];
    const byId = new Map(fromApi.map((domain) => [domain.id, domain]));
    // Prefer live catalog; fall back to route-bound domains for display before catalog loads.
    return selectedIDs
      .map((id) => {
        const catalog = byId.get(id);
        if (catalog) {
          return catalog;
        }
        const bound = (route.zone_domains ?? []).find((item) => item.id === id);
        if (!bound) {
          return null;
        }
        return {
          id: bound.id,
          zone_id: bound.zone_id,
          proxy_route_id: route.id,
          domain: bound.domain,
          cert_id: bound.cert_id,
          created_at: '',
          updated_at: '',
        };
      })
      .filter((item): item is NonNullable<typeof item> => item != null);
  }, [domainsQuery.data, route.id, route.zone_domains, selectedIDs]);

  const hasCertificate = selectedDomains.some(
    (domain) => domain.cert_id != null,
  );

  return (
    <SectionShell
      title={t('domainSettings')}
      description={t('domainSettingsDesc')}
      formId={proxyRouteFormIds.domains}
      saving={saving}
    >
      <Form {...form}>
        <form
          id={proxyRouteFormIds.domains}
          className='space-y-5'
          onSubmit={form.handleSubmit(async (values) => {
            if (values.redirect_http && !hasCertificate) {
              form.setError('redirect_http', {
                message: t('redirectNeedsCert'),
              });
              return;
            }

            await save(
              {
                site_name: values.site_name.trim(),
                zone_domain_ids: values.zone_domain_ids,
                enabled: values.enabled,
                enable_https: hasCertificate,
                redirect_http: hasCertificate ? values.redirect_http : false,
              },
              t('domainSettingsSaved'),
            );
          })}
        >
          <FormField
            control={form.control}
            name='enabled'
            render={({ field }) => (
              <FormItem className='flex items-center justify-between rounded-lg border p-3'>
                <div className='space-y-0.5'>
                  <FormLabel>{t('enableSite')}</FormLabel>
                  <FormDescription>{t('enableSiteDesc')}</FormDescription>
                </div>
                <FormControl>
                  <Switch
                    checked={field.value}
                    onCheckedChange={field.onChange}
                  />
                </FormControl>
              </FormItem>
            )}
          />

          <FormField
            control={form.control}
            name='site_name'
            render={({ field }) => (
              <FormItem>
                <FormLabel>{t('siteId')}</FormLabel>
                <FormControl>
                  <Input placeholder='marketing-site' {...field} />
                </FormControl>
                <FormDescription>{t('siteIdStableDesc')}</FormDescription>
                <FormMessage />
              </FormItem>
            )}
          />

          <FormField
            control={form.control}
            name='zone_domain_ids'
            render={({ field }) => (
              <FormItem>
                <FormLabel>{t('bindDomains')}</FormLabel>
                <FormControl>
                  <ZoneDomainSelector
                    value={field.value}
                    onChange={field.onChange}
                    domains={domainsQuery.data ?? []}
                    zones={zonesQuery.data ?? []}
                    currentRouteId={route.id}
                    disabled={domainsQuery.isLoading}
                    onDomainCreated={async () => {
                      await domainsQuery.refetch();
                    }}
                  />
                </FormControl>
                <FormDescription>{t('bindDomainsHint')}</FormDescription>
                <FormMessage />
              </FormItem>
            )}
          />

          <FormField
            control={form.control}
            name='redirect_http'
            render={({ field }) => (
              <FormItem className='flex items-center justify-between rounded-lg border p-3'>
                <div className='space-y-0.5'>
                  <FormLabel>{t('redirectHttp')}</FormLabel>
                  <FormDescription>
                    {hasCertificate
                      ? t('redirectHttpEnabledHint')
                      : t('redirectHttpNeedsCert')}
                  </FormDescription>
                </div>
                <FormControl>
                  <Switch
                    checked={field.value}
                    disabled={!hasCertificate}
                    onCheckedChange={field.onChange}
                  />
                </FormControl>
                <FormMessage />
              </FormItem>
            )}
          />
        </form>
      </Form>
    </SectionShell>
  );
}