import axios, { AxiosError, AxiosInstance, AxiosRequestConfig, AxiosResponse, InternalAxiosRequestConfig } from "axios";
import { ElMessage } from "element-plus";
import router from "../router";
import { getToken } from "../utils/auth";
import type { ApiError } from "../types/api";
import { useStudyStore } from "../store/study";
import { TEXT } from "../locales";
import { extendAccessToken, forceLogout, lockSession, markNetworkActive } from "../session/sessionManager";
import { useSessionStore } from "../store/session";

const instance: AxiosInstance = axios.create({
  baseURL: "/",
  timeout: 15000,
});

export type ApiRequestConfig = AxiosRequestConfig & {
  ignoreIdle?: boolean;
  allowWhileLocked?: boolean;
  suppressErrorMessage?: boolean;
  _retry?: boolean;
};

class LockedError extends Error {
  constructor() {
    super("LOCKED");
    this.name = "LockedError";
  }
}

instance.interceptors.request.use((config: InternalAxiosRequestConfig & ApiRequestConfig) => {
  const session = useSessionStore();
  const reqUrl = config.url || "";
  const allowWhileLocked =
    config.allowWhileLocked ||
    reqUrl.includes("/api/v1/auth/login") ||
    reqUrl.includes("/api/v1/auth/register") ||
    reqUrl.includes("/api/v1/auth/unlock");
  if (session.locked && !allowWhileLocked) {
    return Promise.reject(new LockedError());
  }
  const token = getToken();
  if (token) {
    config.headers = config.headers || {};
    (config.headers as Record<string, string>).Authorization = `Bearer ${token}`;
  }
  if (!config.ignoreIdle) {
    markNetworkActive();
  }
  return config;
});

instance.interceptors.response.use(
  (response: AxiosResponse) => response,
  async (error: AxiosError<ApiError>) => {
    if (error instanceof LockedError) {
      const lockedConfig = error.config as ApiRequestConfig | undefined;
      if (!lockedConfig?.suppressErrorMessage) {
        ElMessage.warning(TEXT.common.messages.sessionLocked || "请解锁后继续操作");
      }
      return Promise.reject(error);
    }
    const status = error.response?.status;
    const data = error.response?.data;
    const reqUrl = error.config?.url || "";
    const isAuthEndpoint =
      reqUrl.includes("/api/v1/auth/login") ||
      reqUrl.includes("/api/v1/auth/register") ||
      reqUrl.includes("/api/v1/auth/extend") ||
      reqUrl.includes("/api/v1/auth/unlock");
    if (isAuthEndpoint) {
      // 认证相关的错误由具体页面自行处理，避免重复提示
      return Promise.reject(error);
    }
    // 如果当前项目不存在或已失效，清理项目并跳到工作台
    if (status === 404 && typeof data?.message === "string" && data.message.toLowerCase().includes("study")) {
      try {
        const studyStore = useStudyStore();
        studyStore.clearCurrentStudy();
      } catch {
        /* ignore */
      }
      router.push("/workbench");
    }
    if (status === 401) {
      const config = error.config as ApiRequestConfig;
      if (config && !config._retry) {
        const result = await extendAccessToken("response-401");
        if (result.token) {
          config._retry = true;
          config.headers = config.headers || {};
          config.headers.Authorization = `Bearer ${result.token}`;
          return instance(config);
        }
        if (result.authFailed) {
          lockSession("token_invalid");
        }
      }
    } else if (status === 403 && (data as any)?.detail === "账号已停用") {
      forceLogout();
    } else {
      const suppressErrorMessage = (error.config as ApiRequestConfig | undefined)?.suppressErrorMessage;
      if (!suppressErrorMessage) {
        if (data?.message || (data as any)?.detail) {
          const detail = (data as any)?.detail;
          const detailMessage =
            typeof detail === "string" ? detail : typeof detail?.message === "string" ? detail.message : undefined;
          ElMessage.error((data as any)?.message || detailMessage || TEXT.common.messages.requestFailed);
        } else {
          ElMessage.error(TEXT.common.messages.requestFailed);
        }
      }
    }
    return Promise.reject(error);
  }
);

export const apiGet = <T = any>(url: string, config?: ApiRequestConfig) => instance.get<T>(url, config);
export const apiPost = <T = any>(url: string, data?: unknown, config?: ApiRequestConfig) =>
  instance.post<T>(url, data, config);
export const apiPatch = <T = any>(url: string, data?: unknown, config?: ApiRequestConfig) =>
  instance.patch<T>(url, data, config);
export const apiPut = <T = any>(url: string, data?: unknown, config?: ApiRequestConfig) =>
  instance.put<T>(url, data, config);
export const apiDelete = <T = any>(url: string, config?: ApiRequestConfig) =>
  instance.delete<T>(url, config);

export default instance;