import type { WAFIPGroup, WAFIPGroupPayload } from '@/lib/services/openflare';

export function getErrorMessage(error: unknown) {
  return error instanceof Error ? error.message : '操作失败';
}

export function listToText(items: string[] | undefined) {
  return (items ?? []).join('\n');
}

export function parseTextareaList(text: string) {
  return text
    .split(/\r?\n/)
    .map((item) => item.trim())
    .filter(Boolean);
}

export function parseAutomaticConfig(text: string): Record<string, unknown> {
  const parsed = JSON.parse(text || '{}') as unknown;
  if (!parsed || Array.isArray(parsed) || typeof parsed !== 'object') {
    throw new Error('自动配置必须是 JSON 对象。');
  }
  return parsed as Record<string, unknown>;
}

export const ipGroupTypeLabels = {
  manual: '手动',
  automatic: '自动',
  subscription: '订阅',
} as const;

export const automaticPresetRules = [
  {
    name: '单 IP 404 高频扫描',
    expr: 'request_count > 100 && StatusRatio(404) >= 0.8',
  },
  {
    name: '单 IP 直连访问异常',
    expr: 'ip_host_count > 50 && ip_host_ratio > 0.5',
  },
];

export type IPGroupViewEntry = {
  ip: string;
  capturedAt?: string;
  banRemaining?: string;
};

export function buildIPGroupPayloadFromGroup(
  group: WAFIPGroup,
  ipList: string[],
): WAFIPGroupPayload {
  return {
    name: group.name,
    type: group.type,
    enabled: group.enabled,
    ip_list: ipList,
    auto_config: group.auto_config ?? {},
    subscription_url: group.subscription_url ?? '',
    subscription_format: group.subscription_format ?? 'text',
    subscription_mapping_rule: group.subscription_mapping_rule ?? '',
    sync_interval_minutes: group.sync_interval_minutes || 1440,
  };
}

export function formatIPGroupBanRemaining(
  capturedAt: string,
  ttlSeconds: number,
  now = new Date(),
): string {
  if (ttlSeconds <= 0) {
    return '永久';
  }
  const capturedDate = new Date(capturedAt);
  if (Number.isNaN(capturedDate.getTime())) {
    return '—';
  }
  const expireDate = new Date(capturedDate.getTime() + ttlSeconds * 1000);
  if (expireDate.getTime() <= now.getTime()) {
    return '已过期';
  }
  const diffMins = Math.round(
    (expireDate.getTime() - now.getTime()) / (60 * 1000),
  );
  if (diffMins < 60) {
    return `${diffMins} 分钟后`;
  }
  return `${Math.round(diffMins / 60)} 小时后`;
}

export function getIPGroupViewEntries(group: WAFIPGroup): IPGroupViewEntry[] {
  if (group.type === 'automatic' && group.ext_ips && group.ext_ips.length > 0) {
    const ttl =
      typeof group.auto_config?.ttl === 'number' ? group.auto_config.ttl : -1;
    return group.ext_ips.map((item) => ({
      ip: item.ip,
      capturedAt: item.captured_at,
      banRemaining: formatIPGroupBanRemaining(item.captured_at, ttl),
    }));
  }
  return (group.ip_list ?? []).map((ip) => ({ ip }));
}