const FORMAL_AUTH_DATE = '2099-09-09';
const TRIAL_AUTHORIZATION_TEXT = '试用';
const FORMAL_AUTHORIZATION_TEXT = '';

function normalizeDateValue(value: unknown) {
  return String(value ?? '').trim();
}

function normalizeFieldKey(value: string) {
  return value.replace(/[^a-zA-Z0-9]/g, '').toLowerCase();
}

function resolveAuthorizationSource(source?: unknown) {
  const raw = source && typeof source === 'object' ? (source as Record<string, any>) : null;
  const rawData = raw?.data;
  const data = rawData && typeof rawData === 'object' ? (rawData as Record<string, any>) : null;
  return {
    raw,
    rawData,
    data,
  };
}

function getAuthorizationField(source: Record<string, any> | null, keys: string[]) {
  if (!source) return '';
  const matchedKey = keys.find((key) => Object.prototype.hasOwnProperty.call(source, key));
  if (matchedKey) {
    return normalizeDateValue(source[matchedKey]);
  }
  const matchedNormalizedKey = Object.keys(source).find((key) =>
    keys.some((item) => normalizeFieldKey(item) === normalizeFieldKey(key)),
  );
  return matchedNormalizedKey ? normalizeDateValue(source[matchedNormalizedKey]) : '';
}

function getAuthorizationValue(source: unknown, keys: string[]) {
  const { raw, data } = resolveAuthorizationSource(source);
  return getAuthorizationField(data, keys) || getAuthorizationField(raw, keys);
}

function getOverDateTimeValue(source?: unknown) {
  return getAuthorizationValue(source, ['overDateTime', 'overdatetime']);
}

function toDateNumber(value: string | undefined, fallback: number) {
  const parsed = Number(value);
  return Number.isFinite(parsed) ? parsed : fallback;
}

export function getAuthorizationExpirationTime(overDateTime?: unknown) {
  const normalized = normalizeDateValue(overDateTime);
  if (!normalized || isFormalAuthorization(normalized)) return null;

  const normalizedDate = normalized.replace(/\//g, '-');
  const timezoneMatched = /(?:z|[+-]\d{2}:?\d{2})$/i.test(normalizedDate);
  if (timezoneMatched) {
    const timestamp = new Date(normalizedDate.replace(' ', 'T')).getTime();
    return Number.isFinite(timestamp) ? timestamp : null;
  }

  const matched = normalizedDate.match(/^(\d{4})-(\d{1,2})-(\d{1,2})(?:[ T](\d{1,2}):(\d{1,2})(?::(\d{1,2}))?)?/);
  if (!matched) return null;

  const [, year, month, day, hour, minute, second] = matched;
  const isDateOnly = hour === undefined;
  const date = new Date(
    toDateNumber(year, 0),
    toDateNumber(month, 1) - 1,
    toDateNumber(day, 1),
    isDateOnly ? 23 : toDateNumber(hour, 0),
    isDateOnly ? 59 : toDateNumber(minute, 0),
    isDateOnly ? 59 : toDateNumber(second, 0),
    isDateOnly ? 999 : 0,
  );
  const timestamp = date.getTime();
  return Number.isFinite(timestamp) ? timestamp : null;
}

export function isAuthorizationExpired(overDateTime?: unknown, now: Date = new Date()) {
  const expirationTime = getAuthorizationExpirationTime(overDateTime);
  return expirationTime !== null && expirationTime < now.getTime();
}

export function getAuthorizationExpiredMessage(overDateTime?: unknown) {
  const normalized = normalizeDateValue(overDateTime);
  return normalized
    ? `当前授权已于 ${normalized} 过期，请重新导入有效授权文件或联系管理员。`
    : '当前授权已过期，请重新导入有效授权文件或联系管理员。';
}

export function isFormalAuthorization(overDateTime?: unknown) {
  const normalized = normalizeDateValue(overDateTime);
  return normalized.startsWith(FORMAL_AUTH_DATE);
}

export function getAuthorizationStatus(overDateTime?: unknown) {
  return isFormalAuthorization(overDateTime) ? 'formal' : 'trial';
}

export function getAuthorizationLabel(overDateTime?: unknown) {
  const normalized = normalizeDateValue(overDateTime);
  if (!normalized) return '';
  return isFormalAuthorization(normalized) ? FORMAL_AUTHORIZATION_TEXT : TRIAL_AUTHORIZATION_TEXT;
}

export function isTrialAuthorizationLabel(label?: unknown) {
  return normalizeDateValue(label).includes('试用');
}

export function extractAuthorizationCache(source?: unknown) {
  const { rawData, data } = resolveAuthorizationSource(source);
  const overDateTime = getOverDateTimeValue(source);
  const authorizationUnit = getAuthorizationValue(source, ['unit']);
  const authorizationLabel =
    (typeof rawData === 'string' ? normalizeDateValue(rawData) : '') ||
    normalizeDateValue(data?.authorizationLabel || data?.authorizationStatus || data?.authStatus || data?.message) ||
    getAuthorizationLabel(overDateTime);

  return {
    authorizationLabel,
    overDateTime,
    authorizationUnit,
  };
}