import { maskContactPhone } from './phone';
import { shanghaiYmd, startOfShanghaiDay } from './shanghai-date';
import { wecomReportPeriod, type WecomReportKind, type WecomReportPeriod } from './wecom-report';

export const WECOM_PLUGIN_PAGE_SIZE_DEFAULT = 5;
export const WECOM_PLUGIN_PAGE_SIZE_MAX = 10;

export const WECOM_PLUGIN_METRICS_KINDS = ['today', 'daily', 'weekly', 'monthly'] as const;
export type WecomPluginMetricsKind = (typeof WECOM_PLUGIN_METRICS_KINDS)[number];

export type WecomPluginMetricsPeriod = Omit<WecomReportPeriod, 'kind'> & {
  kind: WecomPluginMetricsKind;
};

export function isWecomPluginMetricsKind(v: string): v is WecomPluginMetricsKind {
  return (WECOM_PLUGIN_METRICS_KINDS as readonly string[]).includes(v);
}

export function parseWecomPluginMetricsKind(raw?: string | null): WecomPluginMetricsKind | null {
  const v = String(raw ?? '').trim().toLowerCase();
  if (!v) return 'today';
  return isWecomPluginMetricsKind(v) ? v : null;
}

export function clampWecomPluginPageSize(raw?: string | number | null): number {
  const n = typeof raw === 'number' ? raw : Number(raw);
  if (!Number.isFinite(n) || n <= 0) return WECOM_PLUGIN_PAGE_SIZE_DEFAULT;
  return Math.min(WECOM_PLUGIN_PAGE_SIZE_MAX, Math.max(1, Math.floor(n)));
}

export function clampWecomPluginPage(raw?: string | number | null): number {
  const n = typeof raw === 'number' ? raw : Number(raw);
  if (!Number.isFinite(n) || n <= 0) return 1;
  return Math.min(100, Math.floor(n));
}

/** 长度必须相同后再逐字符 XOR，避免短密码走快速失败路径时的明显差异（仍非密码学级） */
export function verifyWecomPluginApiKey(provided: string, expected?: string | null): boolean {
  const exp = String(expected ?? '');
  const got = String(provided ?? '');
  if (!exp || !got || exp.length !== got.length) return false;
  let diff = 0;
  for (let i = 0; i < exp.length; i++) {
    diff |= exp.charCodeAt(i) ^ got.charCodeAt(i);
  }
  return diff === 0;
}

export function isWecomPluginEnabled(env: {
  WECOM_PLUGIN_ENABLED?: string;
  WECOM_PLUGIN_API_KEY?: string;
}): boolean {
  return env.WECOM_PLUGIN_ENABLED === 'true' && Boolean(String(env.WECOM_PLUGIN_API_KEY ?? '').trim());
}

export function wecomPluginMetricsPeriod(
  kind: WecomPluginMetricsKind,
  now = new Date(),
): WecomPluginMetricsPeriod {
  if (kind === 'today') {
    const start = startOfShanghaiDay(now);
    const ymd = shanghaiYmd(start);
    return {
      kind,
      start,
      endExclusive: now,
      periodKey: ymd,
      title: `今日（${ymd}）`,
      rangeLabel: ymd,
      incrementLabel: '今日新增',
    };
  }
  const period = wecomReportPeriod(kind as WecomReportKind, now);
  return { ...period, kind };
}

export function toWecomPluginUserView(user: {
  userNo: string;
  nickname?: string | null;
  phone?: string | null;
}): { userNo: string; nickname: string; phone: string } {
  return {
    userNo: user.userNo,
    nickname: user.nickname?.trim() || '—',
    phone: maskContactPhone(user.phone),
  };
}