export const AUTH_TAC_SCENE = Object.freeze({
  SMS_LOGIN: "APP_SMS_LOGIN",
  REGISTER: "APP_REGISTER",
  FORGOT_PASSWORD: "APP_FORGOT_PASSWORD",
});

const SUPPORTED_TAC_TYPES = new Set([
  "SLIDER",
  "ROTATE",
  "CONCAT",
  "WORD_IMAGE_CLICK",
]);
const PHONE_PATTERN = /^1[3-9]\d{9}$/;

export const isAuthPhone = (value) =>
  typeof value === "string" && PHONE_PATTERN.test(value);

const contractError = (message, code) => {
  const error = new Error(message);
  error.code = code;
  return error;
};

const requireText = (value, label) => {
  if (typeof value !== "string" || !value.trim()) {
    throw contractError(`${label}不能为空`, "AUTH_TAC_CONTRACT_INVALID");
  }
  return value.trim();
};

export const assertSmsCode = (value) => {
  if (typeof value !== "string" || !/^\d{4}$/.test(value)) {
    throw contractError("请输入 4 位短信验证码", "SMS_CODE_INVALID");
  }
  return value;
};

export const normalizeCaptchaRequirement = (value, expectedSceneCode) => {
  if (!value || typeof value !== "object" || Array.isArray(value)) {
    throw contractError("行为验证策略响应无效", "AUTH_TAC_REQUIREMENT_INVALID");
  }
  const sceneCode = requireText(value.sceneCode, "行为验证场景");
  if (sceneCode !== expectedSceneCode) {
    throw contractError("行为验证场景与当前操作不匹配", "AUTH_TAC_SCENE_MISMATCH");
  }
  // 短信接口把 validToken 定义为必填，因此 required=false 不能在客户端被解释成
  // “跳过验证”。后端必须为短信场景启用 TAC，或另行签发可消费的免验证票据。
  if (value.required !== true) {
    throw contractError(
      "服务端未要求行为验证，无法取得发送短信所需票据",
      "AUTH_TAC_POLICY_INCOMPLETE",
    );
  }
  const providerCode = requireText(value.providerCode, "行为验证服务商").toUpperCase();
  if (providerCode !== "TIANAI") {
    throw contractError("当前仅支持 TIANAI 行为验证服务", "AUTH_TAC_PROVIDER_UNSUPPORTED");
  }
  const captchaType = requireText(value.captchaType, "行为验证码类型").toUpperCase();
  if (!SUPPORTED_TAC_TYPES.has(captchaType)) {
    throw contractError("服务端返回了客户端不支持的验证码类型", "AUTH_TAC_TYPE_UNSUPPORTED");
  }
  const ttlSeconds = Number(value.ttlSeconds);
  if (!Number.isInteger(ttlSeconds) || ttlSeconds < 1) {
    throw contractError("行为验证策略缺少有效期", "AUTH_TAC_TTL_INVALID");
  }
  return { required: true, providerCode, captchaType, sceneCode, ttlSeconds };
};

export const createTacRenderContext = ({
  requestId,
  baseUrl,
  clientId,
  tenantId,
  sceneCode,
  subject,
  requirement,
}) => {
  const normalizedRequirement = normalizeCaptchaRequirement(requirement, sceneCode);
  const normalizedBaseUrl = requireText(baseUrl, "后端地址").replace(/\/+$/, "");
  if (!/^https:\/\/[^/]+/i.test(normalizedBaseUrl)) {
    throw contractError("行为验证只允许使用 HTTPS 后端地址", "AUTH_TAC_HTTPS_REQUIRED");
  }
  const normalizedSubject = requireText(subject, "手机号");
  if (!isAuthPhone(normalizedSubject)) {
    throw contractError("请输入正确的手机号", "AUTH_PHONE_INVALID");
  }
  return {
    requestId: requireText(requestId, "验证请求标识"),
    baseUrl: normalizedBaseUrl,
    challengeUrl: `${normalizedBaseUrl}/captcha/challenge`,
    verifyUrl: `${normalizedBaseUrl}/captcha/verify`,
    clientId: requireText(clientId, "客户端标识"),
    tenantId: requireText(tenantId, "租户标识"),
    sceneCode: normalizedRequirement.sceneCode,
    subject: normalizedSubject,
    providerCode: normalizedRequirement.providerCode,
    captchaType: normalizedRequirement.captchaType,
  };
};

export const normalizeTacSuccess = (value, expectedRequestId) => {
  if (!value || typeof value !== "object" || value.requestId !== expectedRequestId) {
    throw contractError("行为验证结果已过期或与当前请求不匹配", "AUTH_TAC_RESULT_STALE");
  }
  const validToken = requireText(value.validToken, "行为验证票据");
  const expireSeconds = Number(value.expireSeconds);
  if (!Number.isInteger(expireSeconds) || expireSeconds < 1) {
    throw contractError("行为验证票据缺少有效期", "AUTH_TAC_RESULT_INVALID");
  }
  return { requestId: value.requestId, validToken, expireSeconds };
};

export const isSmsDeliveryOutcomeUnknown = (error) => {
  if (!error || typeof error !== "object") return false;
  if (
    error.code === "REQUEST_TIMEOUT" ||
    error.code === "NETWORK_ERROR" ||
    error.code === "RESPONSE_INVALID" ||
    error.code === "REQUEST_CANCELLED"
  ) {
    return true;
  }
  if (error.code === "HTTP_ERROR" || error.code === "BUSINESS_ERROR") {
    const status = Number(
      error.code === "HTTP_ERROR" ? error.httpStatus : error.businessCode,
    );
    if (!Number.isInteger(status)) return true;
    return !(status >= 400 && status < 500 && status !== 408);
  }
  return false;
};