# Source code for macsypy.report

    #########################################################################
    # MacSyFinder - Detection of macromolecular systems in protein dataset  #
    #               using systems modelling and similarity search.          #
    # Authors: Sophie Abby, Bertrand Neron                                  #
    # Copyright (c) 2014-2022  Institut Pasteur (Paris) and CNRS.           #
    # See the COPYRIGHT file for details                                    #
    #                                                                       #
    # This file is part of MacSyFinder package.                             #
    #                                                                       #
    # MacSyFinder is free software: you can redistribute it and/or modify   #
    # it under the terms of the GNU General Public License as published by  #
    # the Free Software Foundation, either version 3 of the License, or     #
    # (at your option) any later version.                                   #
    #                                                                       #
    # MacSyFinder is distributed in the hope that it will be useful,        #
    # but WITHOUT ANY WARRANTY; without even the implied warranty of        #
    # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the          #
    # GNU General Public License for more details .                         #
    #                                                                       #
    # You should have received a copy of the GNU General Public License     #
    # along with MacSyFinder (COPYING).                                     #
    # If not, see <https://www.gnu.org/licenses/>.                          #
    #########################################################################

    """
    Extract informations from the results of hmmsearch
    """

    import os
    import logging
    _log = logging.getLogger(__name__)

    import abc
    from threading import Lock
    from itertools import groupby

    from .database import Indexes, RepliconDB
    from .hit import CoreHit
    from .error import MacsypyError

    class HMMReport(metaclass=abc.ABCMeta):
        """
        Handle the results from the HMM search. Extract a synthetic report from the raw hmmer output,
        after having applied a hit filtering.
        This class is an **abstract class**. There are two implementations of this abstract class
        depending on whether the input sequence dataset is "ordered" ("gembase" or "ordered_replicon" db_type)
        or not ("unordered" db_type).
        """

        def __init__(self, gene, hmmer_output, cfg):
            """
            :param gene: the gene corresponding to the profile search reported here
            :type gene: :class:`macsypy.gene.CoreGene` object
            :param hmmer_output: The path to the raw Hmmer output file
            :type hmmer_output: string
            :param cfg: the configuration object
            :type cfg: :class:`macsypy.config.Config` object
            """
            self.gene = gene
            self._hmmer_raw_out = hmmer_output
            self._extract_out = None
            self.hits = []
            self.cfg = cfg
            self._lock = Lock()

        @abc.abstractmethod
        def _get_replicon_name(self, hit_id):
            """
            This method is used by extract method and must be implemented by concrete class

            :param str hit_id: the id of the current hit extract from hmm output.
            :return: The name of the replicon
            """

        def extract(self):
            """
            Parse the output file of hmmer compute from an unordered genes base
            and produced a new synthetic report file.
            """

            with self._lock:
                # so the extract of a given HMM output is executed only once per run
                # if this method is called several times the first call induce the parsing of HMM out
                # the other calls do nothing
                if self.hits:
                    return

                idx = Indexes(self.cfg)
                my_db = self._build_my_db(self._hmmer_raw_out)
                self._fill_my_db(my_db)

                with open(self._hmmer_raw_out, 'r') as hmm_out:
                    i_evalue_sel = self.cfg.i_evalue_sel()
                    coverage_threshold = self.cfg.coverage_profile()
                    gene_profile_lg = len(self.gene.profile)
                    hmm_hits = (x[1] for x in groupby(hmm_out, self._hit_start))
                    # drop summary
                    next(hmm_hits)
                    for hmm_hit in hmm_hits:
                        hit_id = self._parse_hmm_header(hmm_hit)
                        try:
                            seq_lg, position_hit = my_db[hit_id]
                        except TypeError as err:
                            if my_db[hit_id] is None:
                                msg = f"hit id '{hit_id}' was not indexed, rebuild sequence '{idx.name}' index"
                                _log.critical(msg)
                                raise MacsypyError(msg) from err
                        replicon_name = self._get_replicon_name(hit_id)

                        body = next(hmm_hits)
                        c_hit = self._parse_hmm_body(hit_id, gene_profile_lg, seq_lg, coverage_threshold,
                                                     replicon_name, position_hit, i_evalue_sel, body)
                        self.hits += c_hit
                    self.hits.sort()
                    return self.hits

        def __str__(self):
            """
            :return: string representation of this report
            :rtype: str
            """
            rep = f"""# gene: {self.gene.name} extract from {self._hmmer_raw_out} hmm output
    # profile length= {len(self.gene.profile):d}
    # i_evalue threshold= {self.cfg.i_evalue_sel():.3f}
    # coverage threshold= {self.cfg.coverage_profile():.3f}
    # hit_id replicon_name position_hit hit_sequence_length gene_name gene_system i_eval score profile_coverage sequence_coverage begin end
    """

            for c_hit in self.hits:
                rep += str(c_hit)
            return rep

        def save_extract(self):
            """
            Write the string representation of the extract report in a file.
            The name of this file is the concatenation of the gene name and of the "res_extract_suffix"
            from the config object
            """
            with self._lock:
                extract_out_name = self.gene.name + self.cfg.res_extract_suffix()
                self._extract_out = os.path.join(self.cfg.working_dir(), self.cfg.hmmer_dir(), extract_out_name)
                with open(self._extract_out, 'w') as _file:
                    _file.write(str(self))

        def best_hit(self):
            """
            Return the best hit among multiple hits
            """
            try:
                return self.hits[0]
            except IndexError:
                return None

        def _hit_start(self, line):
            """
            :param line: the line to parse
            :type line: string
            :return: True if it's the beginning of a new hit in Hmmer raw output files.
             False otherwise
            :rtype: boolean.
            """
            return line.startswith(">>")

        def _build_my_db(self, hmm_output):
            """
            Build the keys of a dictionary object to store sequence identifiers of hits.

            :param hmm_output: the path to the hmmsearch output to parse.
            :type hmm_output: string
            :return: a dictionary containing a key for each sequence id of the hits
            :rtype: dict
            """
            db = {}
            with open(hmm_output) as hmm_file:
                hits = (x[1] for x in groupby(hmm_file, self._hit_start) if x[0])
                for hit in hits:
                    db[self._parse_hmm_header(hit)] = None
            return db

        def _fill_my_db(self, db):
            """
            Fill the dictionary with information on the matched sequences

            :param db: the database containing all sequence id of the hits.
            :type db: dict
            """
            idx = Indexes(self.cfg)
            # the indexes are already build
            # just use them
            for seqid, length, rank in idx:
                if seqid in db:
                    db[seqid] = (int(length), int(rank))

        def _parse_hmm_header(self, h_grp):
            """
            :param h_grp: the sequence of string return by groupby function representing the header of a hit
            :type h_grp: sequence of string (<itertools._grouper object at 0x7ff9912e3b50>)
            :returns: the sequence identifier from a set of lines that corresponds to a single hit
            :rtype: string
            """
            for line in h_grp:
                hit_id = line.split()[1]
            return hit_id

        def _parse_hmm_body(self, hit_id, gene_profile_lg, seq_lg, coverage_threshold, replicon_name,
                            position_hit, i_evalue_sel, b_grp):
            """
            Parse the raw Hmmer output to extract the hits, and filter them with threshold criteria selected
            ("coverage_profile" and "i_evalue_select" command-line parameters)

            :param str hit_id: the sequence identifier
            :param int gene_profile_lg: the length of the profile matched
            :paramint  seq_lg: the length of the sequence
            :param float coverage_threshold: the minimal coverage of the profile to be reached in the Hmmer alignment
                                            for hit selection.
            :param str replicon_name: the identifier of the replicon
            :param int position_hit: the rank of the sequence matched in the input dataset file
            :param float i_evalue_sel: the maximal i-evalue (independent evalue) for hit selection
            :param b_grp: the Hmmer output lines to deal with (grouped by hit)
            :type b_grp: list of list of strings
            :returns: a sequence of hits
            :rtype: list of :class:`macsypy.report.CoreHit` objects

            """
            first_line = next(b_grp)
            if not first_line.startswith('   #    score'):
                return []
            else:
                hits = []
                for line in b_grp:
                    if line[0] == '\n':
                        return hits
                    elif line.startswith(" ---   ------ ----- --------"):
                        pass
                    else:
                        fields = line.split()
                        try:
                            # fields[2] = score
                            # fields[5] = i_evalue
                            # fields[6] = hmmfrom
                            # fields[7] = hmm to
                            # fields[9] = alifrom
                            # fields[10] = ali to
                            if len(fields) > 1 and float(fields[5]) <= i_evalue_sel:
                                cov_profile = (float(fields[7]) - float(fields[6]) + 1) / gene_profile_lg
                                begin = int(fields[9])
                                end = int(fields[10])
                                cov_gene = (float(end) - float(begin) + 1) / seq_lg  # To be added in Gene: sequence_length
                                if cov_profile >= coverage_threshold:
                                    i_eval = float(fields[5])
                                    score = float(fields[2])
                                    hits.append(CoreHit(self.gene,
                                                        hit_id,
                                                        seq_lg,
                                                        replicon_name,
                                                        position_hit,
                                                        i_eval,
                                                        score,
                                                        cov_profile,
                                                        cov_gene,
                                                        begin,
                                                        end))
                        except ValueError as err:
                            msg = f"Invalid line to parse :{line}:{err}"
                            _log.debug(msg)
                            raise ValueError(msg) from err

    class GeneralHMMReport(HMMReport):
        """
        Handle HMM report. Extract a synthetic report from the raw hmmer output.
        Dedicated to any type of 'unordered' datasets.
        """

        def _get_replicon_name(self, hit_id):
            # replicon_name = self.cfg. # Define a variable in further devt
            return "Unordered"

    class OrderedHMMReport(HMMReport):
        """
        Handle HMM report. Extract a synthetic report from the raw hmmer output.
        Dedicated to 'ordered_replicon' datasets.
        """

        def _get_replicon_name(self, hit_id):
            return RepliconDB.ordered_replicon_name

    class GembaseHMMReport(HMMReport):
        """
        Handle HMM report. Extract a synthetic report from the raw hmmer output.
        Dedicated to 'gembase' format datasets.
        """

        def _get_replicon_name(self, hit_id):
            replicon_name = "_".join(hit_id.split('_')[:-1])
            return replicon_name