import { useEffect, useState, type ReactNode } from 'react';
import { useTranslation } from 'react-i18next';
import { Button, Col, Input, InputNumber, Row, Select, Switch, message } from 'antd';
import { HttpUtil } from '@/utils';

// Item 7 B3: probe/public-page metadata for an agent node, edited in
// place from the node edit dialog. The section is deliberately outside
// the node form: it loads and saves on its own (dedicated endpoints,
// effective immediately on save — no node save, no restart).
interface ProbeMetaWire {
  price: number;
  currency: string;
  billingCycle: string;
  expiresAt: string | null;
  trafficLimit: number; // bytes
  trafficMode: string;
  trafficResetDay: number;
  public: boolean;
  sort: number;
  group: string;
  publicRemark: string;
  notify: boolean;
  countryPin: string;
  ipv4Pin: string;
  ipv6Pin: string;
  // V2.0.1: ledger corrections in GB (either sign) and the counted
  // interface pin ('' = automatic selection on the agent).
  trafficCalUpGb: number;
  trafficCalDownGb: number;
  statIface: string;
}

const JSON_HEADERS = { headers: { 'Content-Type': 'application/json' } };

const NAMED_CYCLES = [
  'once',
  'monthly',
  'quarterly',
  'semiannual',
  'yearly',
  'biennial',
  'triennial',
] as const;

function Field({ label, children }: { label: string; children: ReactNode }) {
  return (
    <div style={{ marginBottom: 12 }}>
      <div style={{ marginBottom: 4 }}>{label}</div>
      {children}
    </div>
  );
}

export default function ProbeMetaSection({ nodeId }: { nodeId: number }) {
  const { t } = useTranslation();
  const [messageApi, messageContextHolder] = message.useMessage();
  // Loaded meta, keyed by node id so a stale result for a previously
  // edited node is never shown (same discipline as the install block
  // in NodeFormModal); visibility derives during render.
  const [loaded, setLoaded] = useState<{ nodeId: number; meta: ProbeMetaWire } | null>(null);
  const [trafficGb, setTrafficGb] = useState(0);
  const [saving, setSaving] = useState(false);

  useEffect(() => {
    let cancelled = false;
    HttpUtil.get<ProbeMetaWire>(`/panel/api/agent/probe-meta/${nodeId}`, {
      silent: true,
    }).then((msg) => {
      if (!cancelled && msg?.success && msg.obj) {
        setLoaded({ nodeId, meta: msg.obj });
        setTrafficGb(msg.obj.trafficLimit / 1e9);
      }
    });
    return () => {
      cancelled = true;
    };
  }, [nodeId]);

  const meta = loaded && loaded.nodeId === nodeId ? loaded.meta : null;
  if (!meta) return null;

  const set = <K extends keyof ProbeMetaWire>(key: K, value: ProbeMetaWire[K]) =>
    setLoaded((l) => (l ? { nodeId: l.nodeId, meta: { ...l.meta, [key]: value } } : l));

  const cycleLabel = (cycle: string) => {
    switch (cycle) {
      case 'once':
        return t('pages.nodes.probe.cycleOnce');
      case 'monthly':
        return t('pages.nodes.probe.cycleMonthly');
      case 'quarterly':
        return t('pages.nodes.probe.cycleQuarterly');
      case 'semiannual':
        return t('pages.nodes.probe.cycleSemiannual');
      case 'yearly':
        return t('pages.nodes.probe.cycleYearly');
      case 'biennial':
        return t('pages.nodes.probe.cycleBiennial');
      case 'triennial':
        return t('pages.nodes.probe.cycleTriennial');
      default:
        return cycle;
    }
  };
  const cycleOptions: { value: string; label: string }[] = NAMED_CYCLES.map((cycle) => ({
    value: cycle,
    label: cycleLabel(cycle),
  }));
  if (!NAMED_CYCLES.includes(meta.billingCycle as (typeof NAMED_CYCLES)[number])) {
    cycleOptions.push({ value: meta.billingCycle, label: meta.billingCycle });
  }

  async function onSave() {
    if (!meta) return;
    setSaving(true);
    try {
      const payload: ProbeMetaWire = {
        ...meta,
        trafficLimit: Math.round(trafficGb * 1e9),
      };
      const msg = await HttpUtil.put(`/panel/api/agent/probe-meta/${nodeId}`, payload, {
        silent: true,
        ...JSON_HEADERS,
      });
      if (msg?.success) {
        setLoaded({ nodeId, meta: payload });
        messageApi.success(t('pages.nodes.probe.saved'));
      } else {
        messageApi.error(msg?.msg || t('pages.nodes.probe.saveFailed'));
      }
    } finally {
      setSaving(false);
    }
  }

  return (
    <div style={{ marginBottom: 16 }}>
      {messageContextHolder}
      <div style={{ fontWeight: 600, marginBottom: 4 }}>{t('pages.nodes.probe.title')}</div>
      <p style={{ marginBottom: 12 }}>{t('pages.nodes.probe.hint')}</p>
      <Row gutter={16}>
        <Col xs={24} md={12}>
          <Field label={t('pages.nodes.probe.public')}>
            <Switch checked={meta.public} onChange={(v) => set('public', v)} />
          </Field>
        </Col>
        <Col xs={24} md={12}>
          <Field label={t('pages.nodes.probe.notify')}>
            <Switch checked={meta.notify} onChange={(v) => set('notify', v)} />
          </Field>
        </Col>
      </Row>
      <Row gutter={16}>
        <Col xs={24} md={12}>
          <Field label={t('pages.nodes.probe.group')}>
            <Input value={meta.group} onChange={(e) => set('group', e.target.value)} />
          </Field>
        </Col>
        <Col xs={24} md={12}>
          <Field label={t('pages.nodes.probe.sort')}>
            <InputNumber
              value={meta.sort}
              onChange={(v) => set('sort', v ?? 0)}
              style={{ width: '100%' }}
            />
          </Field>
        </Col>
      </Row>
      <Field label={t('pages.nodes.probe.publicRemark')}>
        <Input value={meta.publicRemark} onChange={(e) => set('publicRemark', e.target.value)} />
      </Field>
      <Row gutter={16}>
        <Col xs={24} md={8}>
          <Field label={t('pages.nodes.probe.price')}>
            <InputNumber
              value={meta.price}
              min={0}
              onChange={(v) => set('price', v ?? 0)}
              style={{ width: '100%' }}
            />
          </Field>
        </Col>
        <Col xs={24} md={8}>
          <Field label={t('pages.nodes.probe.currency')}>
            <Input value={meta.currency} onChange={(e) => set('currency', e.target.value)} />
          </Field>
        </Col>
        <Col xs={24} md={8}>
          <Field label={t('pages.nodes.probe.billingCycle')}>
            <Select
              value={meta.billingCycle}
              options={cycleOptions}
              onChange={(v) => set('billingCycle', v)}
              style={{ width: '100%' }}
            />
          </Field>
        </Col>
      </Row>
      <Row gutter={16}>
        <Col xs={24} md={12}>
          <Field label={t('pages.nodes.probe.expiresAt')}>
            <Input
              value={meta.expiresAt ?? ''}
              placeholder="YYYY-MM-DD"
              onChange={(e) => set('expiresAt', e.target.value || null)}
            />
          </Field>
        </Col>
        <Col xs={24} md={12}>
          <Field label={t('pages.nodes.probe.trafficResetDay')}>
            <InputNumber
              value={meta.trafficResetDay}
              min={1}
              max={31}
              onChange={(v) => set('trafficResetDay', v ?? 1)}
              style={{ width: '100%' }}
            />
          </Field>
        </Col>
      </Row>
      <Row gutter={16}>
        <Col xs={24} md={12}>
          <Field label={t('pages.nodes.probe.trafficLimit')}>
            <InputNumber
              value={trafficGb}
              min={0}
              onChange={(v) => setTrafficGb(v ?? 0)}
              style={{ width: '100%' }}
            />
          </Field>
        </Col>
        <Col xs={24} md={12}>
          <Field label={t('pages.nodes.probe.trafficMode')}>
            <Select
              value={meta.trafficMode}
              options={[
                { value: 'sum', label: t('pages.nodes.probe.modeSum') },
                { value: 'up', label: t('pages.nodes.probe.modeUp') },
                { value: 'down', label: t('pages.nodes.probe.modeDown') },
                { value: 'max', label: t('pages.nodes.probe.modeMax') },
              ]}
              onChange={(v) => set('trafficMode', v)}
              style={{ width: '100%' }}
            />
          </Field>
        </Col>
      </Row>
      <Row gutter={16}>
        <Col xs={24} md={8}>
          <Field label={t('pages.nodes.probe.calUp')}>
            <InputNumber
              value={meta.trafficCalUpGb}
              step={0.1}
              onChange={(v) => set('trafficCalUpGb', v ?? 0)}
              style={{ width: '100%' }}
            />
          </Field>
        </Col>
        <Col xs={24} md={8}>
          <Field label={t('pages.nodes.probe.calDown')}>
            <InputNumber
              value={meta.trafficCalDownGb}
              step={0.1}
              onChange={(v) => set('trafficCalDownGb', v ?? 0)}
              style={{ width: '100%' }}
            />
          </Field>
        </Col>
        <Col xs={24} md={8}>
          <Field label={t('pages.nodes.probe.statIface')}>
            <Input
              value={meta.statIface}
              placeholder="eth0"
              onChange={(e) => set('statIface', e.target.value)}
            />
          </Field>
        </Col>
      </Row>
      <p style={{ marginTop: -4, marginBottom: 12 }}>{t('pages.nodes.probe.calHint')}</p>
      <Row gutter={16}>
        <Col xs={24} md={8}>
          <Field label={t('pages.nodes.probe.countryPin')}>
            <Input value={meta.countryPin} onChange={(e) => set('countryPin', e.target.value)} />
          </Field>
        </Col>
        <Col xs={24} md={8}>
          <Field label={t('pages.nodes.probe.ipv4Pin')}>
            <Input value={meta.ipv4Pin} onChange={(e) => set('ipv4Pin', e.target.value)} />
          </Field>
        </Col>
        <Col xs={24} md={8}>
          <Field label={t('pages.nodes.probe.ipv6Pin')}>
            <Input value={meta.ipv6Pin} onChange={(e) => set('ipv6Pin', e.target.value)} />
          </Field>
        </Col>
      </Row>
      <Button type="primary" loading={saving} onClick={onSave}>
        {t('pages.nodes.probe.save')}
      </Button>
    </div>
  );
}