const MOBILE_PHONE_RE = /^1[3-9]\d{9}$/;
const LANDLINE_PHONE_RE = /^0\d{2,3}-?\d{7,8}(-\d{1,6})?$/;

export function normalizePhoneInput(value: string): string {
  return value.replace(/\D/g, '').slice(0, 11);
}

export function validateMobilePhone(phone: string): { ok: boolean; message?: string } {
  const trimmed = phone.trim();
  if (!trimmed) {
    return { ok: false, message: '请输入手机号码' };
  }
  if (trimmed.length !== 11) {
    return { ok: false, message: '手机号码须为 11 位' };
  }
  if (!MOBILE_PHONE_RE.test(trimmed)) {
    return { ok: false, message: '请输入正确的手机号码' };
  }
  return { ok: true };
}

function normalizeContactPhone(raw: string): string {
  return String(raw ?? '')
    .trim()
    .replace(/\s+/g, '');
}

/**
 * 脱敏展示：手机 138****8000；座机隐藏本地号中间四位，如 0379-12****78。
 * 门店详情电话展示用（拨号仍走 toDialablePhone 明文）。
 */
export function maskPhone(phone: string) {
  const normalized = normalizeContactPhone(phone);
  if (!normalized) return '';
  if (MOBILE_PHONE_RE.test(normalized)) {
    const digits = normalized.replace(/\D/g, '');
    return `${digits.slice(0, 3)}****${digits.slice(-4)}`;
  }
  if (LANDLINE_PHONE_RE.test(normalized)) {
    const extMatch = normalized.match(/-(\d{1,6})$/);
    const hasExt = !!extMatch && normalized.indexOf('-') !== normalized.lastIndexOf('-');
    const ext = hasExt ? extMatch![1] : '';
    const main = hasExt ? normalized.slice(0, -(ext.length + 1)) : normalized;
    const digits = main.replace(/\D/g, '');
    const areaLen = digits.startsWith('01') || digits.startsWith('02') ? 3 : 4;
    const area = digits.slice(0, areaLen);
    const local = digits.slice(areaLen);
    // 隐藏本地号中间四位（保留区号，本号前后各留若干位）：0379-12345678 → 0379-12****78
    let maskedLocal: string;
    if (local.length <= 4) {
      maskedLocal = '*'.repeat(local.length);
    } else {
      const keep = local.length - 4;
      const head = Math.max(1, Math.floor(keep / 2));
      const tail = keep - head;
      maskedLocal = `${local.slice(0, head)}${'*'.repeat(4)}${local.slice(local.length - tail)}`;
    }
    const joiner = main.includes('-') ? '-' : '';
    return ext ? `${area}${joiner}${maskedLocal}-${ext}` : `${area}${joiner}${maskedLocal}`;
  }
  return normalized.replace(/(\d{3})\d{4}(\d{4})/, '$1****$2');
}

export function toDialablePhone(raw: string): string {
  return String(raw ?? '').replace(/[\s-]/g, '');
}