import { useCallback, useEffect, useRef } from 'react';
import apiClient from '../api/client';
import { getHealth } from '../api/health';

const HEALTH_POLL_INTERVAL_MS = 5 * 60 * 1000;
const STARTUP_RETRY_DELAYS_MS = [750, 1500, 3000];

const sleep = (delayMs) => new Promise((resolve) => setTimeout(resolve, delayMs));

const getErrorStatus = (error) => Number(error?.response?.status || 0);

const isTransientApiError = (error) => {
  const status = getErrorStatus(error);
  return !status || status === 408 || status === 429 || status >= 500;
};

const requestWithTransientRetry = async (
  requestFn,
  {
    delays = STARTUP_RETRY_DELAYS_MS,
    shouldRetry = isTransientApiError,
  } = {},
) => {
  let lastError = null;
  const retryDelays = Array.isArray(delays) ? delays : [];
  for (let attempt = 0; attempt <= retryDelays.length; attempt += 1) {
    try {
      return await requestFn();
    } catch (error) {
      lastError = error;
      if (attempt >= retryDelays.length || !shouldRetry(error)) {
        throw error;
      }
      await sleep(retryDelays[attempt]);
    }
  }
  throw lastError;
};

export default function useAppAuthLifecycle({
  clearRadarSearchResults,
  radarSearchRequestSeqRef,
  aoeLayerRef,
  activeLayersRef,
  radarPreviewLayersRef,
  setHasRadarSearched,
  setCurrentUser,
  setAuthChecked,
  setPendingTaskIds,
  setHealthLoading,
  setHealthError,
  setHealthStatus,
  setAoiLayer,
  setAllData,
  setRadarPagination,
}) {
  const authGenerationRef = useRef(0);

  const fetchCurrentUser = useCallback(async (options = {}) => {
    const { clearOnFailure = true } = options;
    const requestGeneration = authGenerationRef.current;
    try {
      const response = await requestWithTransientRetry(() => (
        apiClient.get('/auth/me', {
          skipAuthReset: !clearOnFailure,
          authGeneration: requestGeneration,
        })
      ));
      if (requestGeneration === authGenerationRef.current) {
        setCurrentUser(response.data || null);
      }
    } catch (error) {
      if (
        clearOnFailure
        && getErrorStatus(error) === 401
        && requestGeneration === authGenerationRef.current
      ) {
        setCurrentUser(null);
      }
    } finally {
      if (requestGeneration === authGenerationRef.current || !clearOnFailure) {
        setAuthChecked(true);
      }
    }
  }, [setCurrentUser, setAuthChecked]);

  const handleLoginSuccess = useCallback(async (userFromLogin = null) => {
    authGenerationRef.current += 1;
    if (userFromLogin) {
      setCurrentUser(userFromLogin);
      setAuthChecked(true);
      void fetchCurrentUser({ clearOnFailure: false });
      return;
    }
    await fetchCurrentUser({ clearOnFailure: !userFromLogin });
  }, [fetchCurrentUser, setCurrentUser, setAuthChecked]);

  const handleLogout = useCallback(async () => {
    authGenerationRef.current += 1;
    try {
      await apiClient.post('/auth/logout');
    } catch (error) {
      console.error('Logout failed:', error);
    } finally {
      radarSearchRequestSeqRef.current += 1;
      setHasRadarSearched(false);
      clearRadarSearchResults();
      setCurrentUser(null);
      setPendingTaskIds([]);
      setAuthChecked(true);
    }
  }, [
    clearRadarSearchResults,
    radarSearchRequestSeqRef,
    setHasRadarSearched,
    setCurrentUser,
    setPendingTaskIds,
    setAuthChecked,
  ]);

  const fetchHealthStatus = useCallback(async (options = {}) => {
    const { refresh = false, silent = false } = options;
    try {
      if (!silent) {
        setHealthLoading(true);
      }
      setHealthError('');
      const data = await requestWithTransientRetry(
        () => getHealth(refresh ? { refresh: true } : {}),
        { delays: silent ? [] : STARTUP_RETRY_DELAYS_MS.slice(0, 2) },
      );
      setHealthStatus(data || null);
    } catch (error) {
      setHealthError(error.response?.data?.detail || '运维自检失败');
      setHealthStatus(null);
    } finally {
      if (!silent) {
        setHealthLoading(false);
      }
    }
  }, [setHealthLoading, setHealthError, setHealthStatus]);

  useEffect(() => {
    const interceptorId = apiClient.interceptors.response.use(
      (response) => response,
      (error) => {
        const requestGeneration = error?.config?.authGeneration;
        const staleAuthFailure = typeof requestGeneration === 'number' && requestGeneration < authGenerationRef.current;
        if (error?.response?.status === 401 && !error?.config?.skipAuthReset && !staleAuthFailure) {
          radarSearchRequestSeqRef.current += 1;
          setHasRadarSearched(false);
          if (aoeLayerRef.current) {
            aoeLayerRef.current.remove();
            aoeLayerRef.current = null;
          }
          setAoiLayer(null);
          Object.values(activeLayersRef.current).forEach((layer) => layer.remove());
          activeLayersRef.current = {};
          Object.values(radarPreviewLayersRef.current).forEach((layer) => layer.remove());
          radarPreviewLayersRef.current = {};
          setAllData([]);
          setRadarPagination((prev) => ({
            ...prev,
            total: 0,
            offset: 0,
            hasMore: false,
          }));
          setCurrentUser(null);
          setAuthChecked(true);
        }
        return Promise.reject(error);
      }
    );
    return () => {
      apiClient.interceptors.response.eject(interceptorId);
    };
  }, [
    radarSearchRequestSeqRef,
    setHasRadarSearched,
    aoeLayerRef,
    setAoiLayer,
    activeLayersRef,
    radarPreviewLayersRef,
    setAllData,
    setRadarPagination,
    setCurrentUser,
    setAuthChecked,
  ]);

  useEffect(() => {
    fetchCurrentUser();
  }, [fetchCurrentUser]);

  useEffect(() => {
    const startupTimer = setTimeout(() => {
      void fetchHealthStatus({ silent: true });
    }, 1500);
    const interval = setInterval(() => {
      void fetchHealthStatus({ silent: true });
    }, HEALTH_POLL_INTERVAL_MS);
    return () => {
      clearTimeout(startupTimer);
      clearInterval(interval);
    };
  }, [fetchHealthStatus]);

  return {
    handleLoginSuccess,
    handleLogout,
    fetchHealthStatus,
  };
}