data_manager.py

"""
Identifier:     KSC-SJ4-csst_common/data_manager.py
Name:           data_manager.py
Description:    file path generator
Author:         Bo Zhang
Created:        2022-09-13
Modified-History:
    2022-09-13, Bo Zhang, created
    2022-09-13, Bo Zhang, added CsstMbiDataManager
    2022-09-29, Bo Zhang, favor CsstMsDataManager instead of CsstMbiDataManager
    2022-10-26, Bo Zhang, reconstruct CsstMsDataManager, deprecate CsstMbiDataManager
    2022-10-28, Bo Zhang, added CsstMsDataManager.query_rc(), dm.use_dfs, dm.node
    2022-11-06, Bo Zhang, deleted CsstMbiDataManager
    2022-11-20, Bo Zhang, added DFS APIs
"""
import glob
import os
import re
from typing import Union

import numpy as np
from astropy.io import fits
from astropy.table import Table
from csst_dfs_api.facility.calmerge import CalMergeApi
from csst_dfs_api.facility.level0 import Level0DataApi
from csst_dfs_api.facility.level0prc import Level0PrcApi
from csst_dfs_api.msc.level1 import Level1DataApi
from csst_dfs_api.msc.level2 import Level2DataApi
from csst_dfs_api.common.catalog import CatalogApi

from .logger import get_logger
from .params import CSST_PARAMS as CP
from .params import DFS_CONF


class CsstMsDataManager:
    """
    CSST MS data manager, including MBI and SLS.

    ``CsstMsDataManager`` provides an interface to switch between DFS and local file system.
    To initialize ``CsstMsDataManager`` from local directory, use ``CsstMsDataManager.from_dir()``
    To initialize ``CsstMsDataManager`` on ``dandelion`` or ``PM node``, ``CsstMsDataManager.quickstart()``.
    To initialize ``CsstMsDataManager`` from DFS, use ``CsstMsDataManager.from_dfs()``.
    To generate L0 and L1 file paths, use ``CsstMsDataManager.l0_detector()``, ``CsstMsDataManager.l1_detector()``, etc.
    Here are some examples for simulation with different versions.
    C3:
        MSC_MS_210525220000_100000020_06_raw.fits
        MSC_CRS_210525220000_100000020_06_raw.fits
        MSC_210525120000_0000020_06.cat
    C5.1:
        CSST_MSC_MS_SCI_20270810081950_20270810082220_100000100_06_L0_1.fits
        CSST_MSC_MS_CRS_20270810081950_20270810082220_100000100_06_L0_1.fits
        MSC_10000100_chip_06_filt_y.cat
        MSC_10000100_chip_06_filt_y.log
    C5.2
        CSST_MSC_MS_SCI_20270810081950_20270810082220_100000100_06_L0_1.fits
        CSST_MSC_MS_CRS_20270810081950_20270810082220_100000100_06_L0_1.fits
        MSC_100000100_chip_06_filt_y.cat
        MSC_100000100_chip_06_filt_y.log

    Parameters
    ----------
    ver_sim : str
        The version of simulation data, see ``csst_common.params.CP``.
    datatype : str
        The options are {"mbi", "sls", "all"}.
        The "all" option is used for QC in particular.
        Note that in this case methods like ``get_bias`` are unavailable.
    available_detectors : list
        The list of available detector serial numbers of available images.
    target_detectors : list
        The list of target detector serial numbers of available images.
    dir_l0 : str
        The L0 directory.
    dir_l1 : str
        The L1 directory.
    path_aux : str
        The aux data directory (bias, flat, dark).
    use_dfs : bool
        If True, use DFS. In case some modules may have other options such as astroquery.
    dfs_node : str
        The environment in which the pipeline will run.
        Use "pml" for Purple Mountain Lab cluster and "local" for others.
    dfs_root : str
        The DFS root path.
    obs_id : int
        The exposure ID.
    exp_start : int
        The exposure start time in ``yyyymmddhhmmss`` format.
    exp_stop : int
        The exposure start time in ``yyyymmddhhmmss`` format.
    _telescope : str
        The telescope name. Defaults to ``CSST`` for C5.2 simulation.
    _instrument : str
        The instrument name. Defaults to ``MSC`` for C5.2 simulation.
    _survey : str
        The survey name. Defaults to ``MS`` for C5.2 simulation.
    obs_type : str
        The image type signature for science images. Defualts to ``SCI`` for C5.2 simulation.
    l0_post : str
        The postfix. Defaults to ``L0_1`` for C5.2 simulation.
    log_ppl : str
        The pipeline log file name.
    log_mod : str
        The module log file name.
    clear_dir : bool
        If True, clear ``dm.dir_l1`` directory.
    verbose : bool
        If True, print verbose info.
    n_jobs : int
        The number of jobs.
    backend : str
        The joblib backend.

    Examples
    --------
    >>> dm_mbi = CsstMsDataManager(...)
    >>> # access L0 directory
    >>> dm_mbi.dir_l0
    >>> # access L1 directory
    >>> dm_mbi.dir_l1
    >>> # access path_aux
    >>> dm_mbi.path_aux
    >>> # access ver_sim
    >>> dm_mbi.ver_sim
    >>> # access target detectors
    >>> dm_mbi.target_detectors
    >>> # access available detectors
    >>> dm_mbi.available_detectors
    >>> # define an L1 file (detector-specified)
    >>> dm_mbi.l1_detector(detector=6)
    >>> # define an L1 file (non-detector-specified)
    >>> dm_mbi.l1_file("flipped_image.fits")
    """

    def __init__(self,
                 ver_sim: str = "C5.2",
                 datatype: str = "mbi",
                 available_detectors: Union[None, list] = None,
                 target_detectors: Union[None, list, int] = None,
                 dir_l0: str = ".",
                 dir_l1: str = ".",
                 path_aux: str = "/L1Pipeline/aux",  # aux dir
                 use_dfs: bool = False,
                 dfs_node: str = "kmust",
                 dfs_root: str = "/share/dfs",
                 obs_id: str = "100000100",
                 exp_start: int = "20270810081950",
                 exp_stop: int = "20270810082220",
                 _telescope: str = "CSST",
                 _instrument: str = "MSC",
                 _survey: str = "MS",
                 obs_type: str = "SCI",
                 l0_post: str = "L0_1",
                 log_ppl="csst-l1ppl.log",
                 log_mod="csst-l1mod.log",
                 clear_dir=False,
                 verbose=True,
                 n_jobs=18,
                 backend="multiprocessing"
                 ):

        # version
        assert ver_sim in CP["sim"]["versions"]
        self.ver_sim = ver_sim

        # datatype, valid_detectors, detector2filter
        assert datatype in ["mbi", "sls", "all"]
        self.datatype = datatype
        if datatype == "mbi":
            # MBI
            self.valid_detectors = CP["mbi"]["detectors"]
            self.detector2filter = CP["mbi"]["detector2filter"]
        elif datatype == "sls":
            # SLS
            self.valid_detectors = CP["sls"]["detectors"]
            self.detector2filter = CP["sls"]["detector2filter"]
        else:
            # ALL
            self.valid_detectors = CP["all"]["detectors"]
            self.detector2filter = CP["all"]["detector2filter"]
        if verbose:
            print("Data type is: ", self.datatype)
            print("Valid detectors are: ", self.valid_detectors)

        # available_detectors
        self.available_detectors = available_detectors if available_detectors is not None else list()
        if verbose:
            print("Available detectors are:", self.available_detectors)
        # set all available detectors by default
        self.target_detectors = target_detectors
        if verbose:
            print("Target detectors are: ", self._target_detectors)

        # exposure info
        self.obs_id = obs_id
        self.exp_start = exp_start
        self.exp_stop = exp_stop

        # file name components
        self._telescope = _telescope
        self._instrument = _instrument
        self._survey = _survey
        self.obs_type = obs_type
        self.l0_post = l0_post

        # DFS configuration
        self.use_dfs = use_dfs
        self.dfs_node = dfs_node
        self.dfs_root = dfs_root

        # data directory
        self.dir_l0 = dir_l0
        self.dir_l1 = dir_l1
        self.path_aux = path_aux
        self.ref_version = None

        # record hard code names in history
        self.hardcode_history = []

        self.n_jobs = n_jobs
        self.backend = backend

        # aXe
        self.set_env()

        # change to working directory
        os.chdir(self.dir_l1)
        # clear dir_l1
        if clear_dir:
            self.clear_dir(self.dir_l1)

        # pipeline logger
        self.logger_ppl = get_logger(name="CSST L1 Pipeline Logger", filename=os.path.join(dir_l1, log_ppl))
        if verbose:
            self.logger_ppl.info("logger_ppl initialized")
        # module logger
        self.logger_mod = get_logger(name="CSST L1 Module Logger", filename=os.path.join(dir_l1, log_mod))
        if verbose:
            self.logger_mod.info("logger_mod initialized")

        self.custom_bias = None
        self.custom_dark = None
        self.custom_flat = None

    # DFS APIs
    @property
    def dfs_L0DataApi(self):
        return Level0DataApi()

    @property
    def dfs_L1DataApi(self):
        return Level1DataApi()

    @property
    def dfs_L2DataApi(self):
        return Level2DataApi()

    @property
    def dfs_L0PrcApi(self):
        return Level0PrcApi()

    @property
    def dfs_CalApi(self):
        return CalMergeApi()

    @property
    def dfs_CatApi(self):
        return CatalogApi()

    def set_env(self):
        """ set environment variables """
        if os.uname()[1] == "dandelion":
            os.environ["LD_LIBRARY_PATH"] = "/home/csstpipeline/anaconda3/lib"
            os.environ["AXE_BINDIR"] = "/home/csstpipeline/PycharmProjects/axe/cextern/src"
        else:
            os.environ["LD_LIBRARY_PATH"] = ""
            os.environ["AXE_BINDIR"] = ""

    @property
    def target_detectors(self):
        return self._target_detectors

    @target_detectors.setter
    def target_detectors(self, detectors: Union[None, list, int] = None):
        assert detectors is None or type(detectors) in [list, int]
        if detectors is None:
            self._target_detectors = list(set(self.available_detectors) & set(self.valid_detectors))
        elif isinstance(detectors, list):
            self._target_detectors = list(set(self.available_detectors) & set(self.valid_detectors) & set(detectors))
        elif isinstance(detectors, int):
            self._target_detectors = list(set(self.available_detectors) & set(self.valid_detectors) & {detectors})

    def set_detectors(self, detectors=None):
        raise DeprecationWarning("This method is deprecated, please directly use dm.target_detectors = detectors!")

    @staticmethod
    def from_dir(
            ver_sim="C5.2",
            datatype="mbi",
            dir_l0=".",
            dir_l1=".",
            path_aux="",
            use_dfs=False,
            dfs_node="kmust",
            n_jobs=18,
            backend="multiprocessing"
    ):
        """ initialize the multi-band imaging data manager """

        assert ver_sim in ["C5.2", ]

        # glob files
        fps_img = CsstMsDataManager.glob_image(dir_l0, ver_sim=ver_sim)
        if len(fps_img) == 0:
            raise FileNotFoundError(f"No file found in dir_l0: {dir_l0}")

        # available detectors
        available_detectors = [int(re.split(r"[_.]", fp)[7]) for fp in fps_img]
        available_detectors.sort()

        # parse info
        (_telescope, _instrument, _survey, obs_type,
         exp_start, exp_stop, obs_id,
         _detector, *l0_post, _ext) = re.split(r"[_.]", fps_img[0])

        # exp_start = int(exp_start)
        # exp_stop = int(exp_stop)
        # obs_id = int(obs_id)

        return CsstMsDataManager(
            ver_sim=ver_sim,
            datatype=datatype,
            available_detectors=available_detectors,
            target_detectors=None,
            dir_l0=dir_l0,
            dir_l1=dir_l1,
            path_aux=path_aux,  # bias dark flat
            use_dfs=use_dfs,
            dfs_node=dfs_node,
            obs_id=obs_id,
            exp_start=exp_start,
            exp_stop=exp_stop,
            _telescope=_telescope,
            _instrument=_instrument,
            _survey=_survey,
            obs_type=obs_type,
            l0_post="_".join(l0_post),
            n_jobs=n_jobs,
            backend=backend
        )

    @staticmethod
    def glob_image(dir_l0, ver_sim="C5.2"):
        """ glob files in L0 data directory """
        if ver_sim == "C3":
            pattern = os.path.join(dir_l0, "MSC_MS_*_raw.fits")
        else:
            assert ver_sim in ["C5.1", "C5.2"]
            pattern = os.path.join(dir_l0, "CSST_MSC_MS_SCI_*.fits")
        fps = glob.glob(pattern)
        fps = [os.path.basename(fp) for fp in fps]
        fps.sort()

        print("{} files found with pattern: {}".format(len(fps), pattern))
        return fps

    @staticmethod
    def glob_cat(dir_l0, ver_sim="C5"):
        """ glob input catalogs in L0 data directory """
        assert ver_sim in ["C5.1", "C5.2"]
        pattern = os.path.join(dir_l0, "MSC_*.cat")
        fps = glob.glob(pattern)
        fps = [os.path.basename(fp) for fp in fps]
        fps.sort()

        print("@DM.glob_dir: {} files found with pattern: {}".format(len(fps), pattern))
        return fps

    def l0_id(self, detector=6):
        """ Level0 ID, consistent with DFS. """
        return f"{self.obs_id}{detector:02d}"

    def l0_cat(self, detector=6):
        """ the L0 cat file path"""
        assert self.ver_sim == "C5.2"
        fn = "{}_{}_chip_{:02d}_filt_{}.cat".format(
            self._instrument, self.obs_id, detector, self.detector2filter[detector])
        return os.path.join(self.dir_l0, fn)

    def l0_log(self, detector=6):
        """ L0 log file path """
        assert self.ver_sim == "C5.2"
        fn = "{}_{}_chip_{:02d}_filt_{}.log".format(
            self._instrument, self.obs_id, detector, self.detector2filter[detector])
        return os.path.join(self.dir_l0, fn)

    def l0_detector(self, detector=6):
        """ L0 detector-specific image file path """
        assert self.ver_sim in ["C5.1", "C5.2"]
        fn = "{}_{}_{}_SCI_{}_{}_{}_{:02d}_L0_1.fits".format(
            self._telescope, self._instrument, self._survey,
            self.exp_start, self.exp_stop, self.obs_id, detector)
        return os.path.join(self.dir_l0, fn)

    def l0_crs(self, detector=6):
        """ L0 cosmic ray file path """
        assert self.ver_sim in ["C5.1", "C5.2"]
        fn = "{}_{}_{}_CRS_{}_{}_{}_{:02d}_L0_1.fits".format(
            self._telescope, self._instrument, self._survey,
            self.exp_start, self.exp_stop, self.obs_id, detector)
        return os.path.join(self.dir_l0, fn)

    def l1_detector(self, detector=6, post="img.fits"):
        """ generate L1 file path

        Parameters
        ----------
        detector:
            detector ID
        post:
            postfix
            e.g, {"img.fits", "wht.fits", "flg.fits", "img_L1.fits", "wht_L1.fits", "flg_L1.fits"}

        Returns
        -------
        L1 file path

        """
        assert self.ver_sim in ["C5.1", "C5.2"]
        fn = "{}_{}_{}_SCI_{}_{}_{}_{:02d}_{}".format(
            self._telescope, self._instrument, self._survey,
            self.exp_start, self.exp_stop, self.obs_id, detector, post)
        return os.path.join(self.dir_l1, fn)

    def get_bias(self, detector=6):
        """ get bias data """
        if self.custom_bias is None:
            return os.path.join(
                self.path_aux,
                "C6.1_ref_crds",
                "csst_msc_{}_{:02d}_{:04d}.fits".format(
                    "bias", detector, 1 if self.ref_version is None else self.ref_version
                )
            )
        else:
            return self.custom_bias.format("bias", detector)

    def get_dark(self, detector=6):
        """ get dark data """
        if self.custom_dark is None:
            return os.path.join(
                self.path_aux,
                "C6.1_ref_crds",
                "csst_msc_{}_{:02d}_{:04d}.fits".format(
                    "dark", detector, 1 if self.ref_version is None else self.ref_version
                )
            )
        else:
            return self.custom_dark.format("dark", detector)

    def get_flat(self, detector=6):
        """ get flat data """
        if self.custom_flat is None:
            return os.path.join(
                self.path_aux,
                "C6.1_ref_crds",
                "csst_msc_{}_{:02d}_{:04d}.fits".format(
                    "flat", detector, 1 if self.ref_version is None else self.ref_version
                )
            )
        else:
            return self.custom_flat.format("flat", detector)

    def get_axeconf(self):
        return os.path.join(self.path_aux, "axeconf")  # "/home/csstpipeline/L1Pipeline/aux/axeconf"

    def l1_file(self, name="", comment=""):
        """ L1 file path

        Parameters
        ----------
        name : str
            file name
        comment : str
            use the function name plz

        Returns
        -------
        fp: str
            the synthetic file path

        """
        fp = os.path.join(self.dir_l1, name)
        # record hardcode history
        self.hardcode_history.append(dict(hdcd=fp, comment=comment))
        return fp

    def get_sls_info(self):
        """ Get the target SLS image header info and return. """
        # if self.use_dfs:
        #     raise NotImplementedError()
        # else:
        assert len(self.target_detectors) == 1
        header = fits.getheader(self.l0_detector(self.target_detectors[0]), ext=1)
        return header

    def get_mbi_info(self):
        """ Get all MBI image header info and return as a table. """
        # if self.use_dfs:
        #     raise NotImplementedError()
        # else:
        info = Table.read("/nfsdata/share/csst_simulation_data/Cycle-5-SimuData/slitlessSpectroscopy/t_mbi_l1.fits")
        return info

    @staticmethod
    def quickstart(ver_sim="C5.2", datatype="mbi", dir_l1=".", exposure_id=100,
                   use_dfs=False, dfs_node="kmust", clear_l1=False, n_jobs=18, backend="multiprocessing"):
        """
        Quick dataset generator for tests on dandelion or PML

        Parameters
        ----------
        ver_sim : str
            {"C5.2"}
        datatype : str
            {"mbi", "sls"}
        dir_l1 : str
            output directory
        exposure_id : int
            The serial number of the exposure. 20-154 for C5.2.
        use_dfs : bool
            If True, use DFS.
        dfs_node : str
            The DFS node. Defaults to "kmust", could be "pml".
        clear_l1 : bool
            If True, clear dir_l1.
        n_jobs : int
            The number of jobs.
        backend : str
            The joblib backend.

        Returns
        -------
        CsstMsDataManager
            The Main Survey Data Manager instance.
        """
        assert datatype in ["mbi", "sls"]
        # auto identify node name
        hostname = os.uname()[1]
        assert hostname in ["dandelion", "ubuntu"]

        # dandelion
        if hostname == "dandelion" and datatype == "mbi":
            dir_l0 = "/nfsdata/share/csst_simulation_data/Cycle-5-SimuData/multipleBandsImaging/" \
                     "NGP_AstrometryON_shearOFF/MSC_{:07d}/".format(exposure_id)
            path_aux = "/nfsdata/users/csstpipeline/L1Pipeline/aux"
        elif hostname == "dandelion" and datatype == "sls":
            dir_l0 = "/nfsdata/share/csst_simulation_data/Cycle-5-SimuData/slitlessSpectroscopy/" \
                     "NGP_AstrometryON_shearOFF_Spec/MSC_{:07d}/".format(exposure_id)
            path_aux = "/nfsdata/users/csstpipeline/L1Pipeline/aux"

        # PMO
        elif hostname == "ubuntu" and datatype == "mbi":
            dir_l0 = "/share/simudata/CSSOSDataProductsSims/data/CSSTSimImage_C5/" \
                     "NGP_AstrometryON_shearOFF/MSC_{:07d}/".format(exposure_id)
            path_aux = "/data/sim_data/MSC_0000100/ref/MSC_{}_*_{:02d}_combine.fits"
        elif hostname == "ubuntu" and datatype == "sls":
            dir_l0 = "/share/simudata/CSSOSDataProductsSims/data/CSSTSimImage_C5/" \
                     "NGP_AstrometryON_shearOFF_Spec/MSC_{:07d}/".format(exposure_id)
            path_aux = ""
        else:
            raise ValueError("@DM: invalid hostname {} or datatype {}!".format(hostname, datatype))

        return CsstMsDataManager.from_dir(
            ver_sim=ver_sim, datatype=datatype, dir_l0=dir_l0, dir_l1=dir_l1, path_aux=path_aux,
            use_dfs=use_dfs, dfs_node=dfs_node, n_jobs=n_jobs, backend=backend
        )

    def __repr__(self):
        lines = ""
        lines += "<CsstMsDataManager>\n"
        lines += f"- Data type = {self.datatype}\n"
        lines += f"- Valid detectors = {self.valid_detectors}\n"
        lines += f"- Available detectors = {self.available_detectors}\n"
        lines += f"- Target detectors = {self.target_detectors}\n"
        lines += f"- dir_l0 = {self.dir_l0}\n"
        lines += f"- dir_l1 = {self.dir_l1}\n"
        lines += f"- use_dfs = {self.use_dfs}\n"
        lines += f"- dfs_node = {self.dfs_node}\n"
        lines += f"- CSST_DFS_GATEWAY = " + os.getenv("CSST_DFS_GATEWAY") + "\n"
        return lines

    def remove_files(self, fmt="*.fits"):
        """ Remove L1 files conforming the format. """
        os.system(f"rm -rf {os.path.join(self.dir_l1, fmt)}")

    def remove_dir(self, dir_name):
        """ Remove L1 (sub-)directory. """
        os.system(f"rm -rf {os.path.join(self.dir_l1, dir_name)}")

    @staticmethod
    def clear_dir(dir_path):
        os.system(f"rm -rf {dir_path}/*")

    # DFS interfaces
    @property
    def dfs_node(self):
        return self._dfs_node

    @dfs_node.setter
    def dfs_node(self, dfs_node):
        # for DFS configuration, defaults to "local", could be "pml"
        assert dfs_node in DFS_CONF.keys()
        self._dfs_node = dfs_node
        for k, v in DFS_CONF[dfs_node].items():
            os.environ[k] = v

    @staticmethod
    def dfs_is_available():
        """ Test if DFS works. """
        try:
            tbl = CatalogApi().catalog_query(
                catalog_name="gaia3",
                ra=180,
                dec=0,
                radius=.1,
                columns=("ra", "dec"),
                min_mag=0,
                max_mag=30,
                obstime=-1,
                limit=-1
            )
            return len(tbl) > 0
        except:
            return False

    def dfs_rc_query(
            self,
            ra=180,
            dec=0,
            radius=2,
            columns=(
                    'ref_epoch',
                    'ra',
                    'ra_error',
                    'dec',
                    'dec_error',
                    'parallax',
                    'parallax_error',
                    'pmra',
                    'pmra_error',
                    'pmdec',
                    'pmdec_error',
                    'phot_g_mean_mag',
                    'source_id'
            ),
            min_mag=0,
            max_mag=30,
            obstime=-1,
            limit=-1
    ):
        """ Query Reference Catalog (RC) from DFS.
        Ref.
        https://gea.esac.esa.int/archive/documentation/GDR3/Gaia_archive/chap_datamodel/
        sec_dm_main_source_catalogue/ssec_dm_gaia_source.html
        """
        try:
            cat = self.dfs_CatApi.catalog_query(
                catalog_name="gaia3",
                ra=ra,
                dec=dec,
                columns=columns,
                radius=radius,
                min_mag=min_mag,
                max_mag=max_mag,
                obstime=obstime,
                limit=limit
            )
            tbl = self.dfs_CatApi.to_table(cat)
            return tbl
        except:
            print("Error occurred during the query!")
            return None

    def dfs_l1_push(self):
        """ Push MBI/SLS L1 data to DFS. """
        # l1api = get_l1api()
        # l1api.write()
        return

    def dfs_l2_push(self):
        """ Push SLS spectra to DFS. """
        pass

    @staticmethod
    def from_l1id(
            l1_id="1000000001",
            datatype="sls",
            dir_l0="/L1Pipeline/L0",
            dir_l1="/L1Pipeline/L1",
            use_dfs=True,
            dfs_node="pml",
            clear_l1=False,
            dfs_root="/share/dfs"
    ):
        pass

    @staticmethod
    def from_dfs(
            obs_id="100000100",
            datatype="mbi",
            dir_l0="/L1Pipeline/L0",
            dir_l1="/L1Pipeline/L1",
            path_aux="/L1Pipeline/aux",
            use_dfs=True,
            dfs_node="pml",
            clear_l1=False,
            dfs_root="/share/dfs",
            n_jobs=18,
            backend="multiprocessing"
    ):
        """ Initialize CsstMsDataManager from DFS. """
        # (clear and) make directories
        if os.path.exists(dir_l0):
            os.system(f"rm -rf {dir_l0}/*")
        else:
            os.mkdir(dir_l0)
        # if os.path.exists(dir_l1):
        #     os.system(f"rm -rf {dir_l1}/*")
        # else:
        #     os.mkdir(dir_l1)
        # os.chdir(dir_l1)
        if not os.path.exists(dir_l1):
            os.mkdir(dir_l1)
        elif clear_l1:
            os.system(f"rm -rf {dir_l1}/*")
        os.chdir(dir_l1)

        print(f"Query obs_id={obs_id} ...", end="")
        records = CsstMsDataManager(dfs_node=dfs_node, verbose=False).dfs_L0DataApi.find(obs_id=obs_id)
        print(f"{records['totalCount']} records obtained!")
        tbl = Table([_.__dict__ for _ in records["data"]])
        tbl.sort(["detector_no", "obs_type"])

        print("Making symbolic links ...")
        for i_rec in range(len(tbl)):
            os.symlink(
                src=os.path.join(dfs_root, tbl["file_path"][i_rec]),
                dst=os.path.join(dir_l0, os.path.basename(tbl["file_path"][i_rec])),
            )


        # initialize dm
        dm = CsstMsDataManager.from_dir(
            ver_sim="C5.2", datatype=datatype, dir_l0=dir_l0, dir_l1=dir_l1,
            path_aux=path_aux, use_dfs=use_dfs, dfs_node=dfs_node,
            n_jobs=n_jobs, backend=backend
        )
        assert dm.obs_id == obs_id

        return dm

    def dfs_l0_query(self, obs_id: str = "100000100"):
        """ Query L0 data from DFS. """
        result = self.dfs_L0DataApi.find(obs_id=str(obs_id))
        print(f"{result['totalCount']} records returned from DFS.")
        if not result["code"] == 0:
            raise ValueError(f"DFS returns non-zero code! ({result['code']})")
        tbl = Table([_.__dict__ for _ in result["data"]])
        tbl.sort(["detector_no", "obs_type"])
        # Check if all 30 detectors are available
        for detector in CP["all"]["detectors"]:
            for obs_type in ["sci", "cosmic_ray"]:
                if np.sum((tbl["detector_no"] == f"{detector:02d}") & (tbl["obs_type"] == obs_type)) == 0:
                    self.logger_ppl.warning(f"Record not found for detector {detector:02d} and obs_type {obs_type}")
        return tbl

    def dfs_l0_check_all(self):
        """ Check all C5.2 L0 data is available in DFS. """
        is_good = True
        for obs_id in range(100000020, 100000155):
            tbl = self.dfs_l0_query(obs_id=f"{obs_id}")
            if len(tbl) == 60:
                self.logger_ppl.info(f"DFS returns {len(tbl)} records for obs_id={obs_id}")
            else:
                is_good = False
                self.logger_ppl.warning(f"DFS returns {len(tbl)} records for obs_id={obs_id}")
        return is_good

    def dfs_l1_query(self, obs_id, detector):
        """ Query L1 data from DFS. """
        pass


# temporarily compatible with old interface
CsstMbiDataManager = CsstMsDataManager