#!/usr/bin/env python3

"""Module containing the Genion class and the command line interface."""
import os
import shutil
import argparse
from pathlib import Path
from biobb_common.generic.biobb_object import BiobbObject
from biobb_common.configuration import settings
from biobb_common.tools import file_utils as fu
from biobb_common.tools.file_utils import launchlogger
from biobb_md.gromacs.common import get_gromacs_version
from biobb_md.gromacs.common import GromacsVersionError


class Genion(BiobbObject):
    """
    | biobb_md Genion
    | Wrapper class for the `GROMACS genion <http://manual.gromacs.org/current/onlinehelp/gmx-genion.html>`_ module.
    | The GROMACS genion module randomly replaces solvent molecules with monoatomic ions. The group of solvent molecules should be continuous and all molecules should have the same number of atoms.

    Args:
        input_tpr_path (str): Path to the input portable run input TPR file. File type: input. `Sample file <https://github.com/bioexcel/biobb_md/raw/master/biobb_md/test/data/gromacs/genion.tpr>`_. Accepted formats: tpr (edam:format_2333).
        output_gro_path (str): Path to the input structure GRO file. File type: output. `Sample file <https://github.com/bioexcel/biobb_md/raw/master/biobb_md/test/reference/gromacs/ref_genion.gro>`_. Accepted formats: gro (edam:format_2033).
        input_top_zip_path (str): Path the input TOP topology in zip format. File type: input. `Sample file <https://github.com/bioexcel/biobb_md/raw/master/biobb_md/test/data/gromacs/genion.zip>`_. Accepted formats: zip (edam:format_3987).
        output_top_zip_path (str): Path the output topology TOP and ITP files zipball. File type: output. `Sample file <https://github.com/bioexcel/biobb_md/raw/master/biobb_md/test/reference/gromacs/ref_genion.zip>`_. Accepted formats: zip (edam:format_3987).
        input_ndx_path (str) (Optional): Path to the input index NDX file. File type: input. Accepted formats: ndx (edam:format_2330).
        properties (dict - Python dictionary object containing the tool parameters, not input/output files):
            * **replaced_group** (*str*) - ("SOL") Group of molecules that will be replaced by the solvent.
            * **neutral** (*bool*) - (False) Neutralize the charge of the system.
            * **concentration** (*float*) - (0.05) [0~10|0.01] Concentration of the ions in (mol/liter).
            * **seed** (*int*) - (1993) Seed for random number generator.
            * **gmx_lib** (*str*) - (None) Path set GROMACS GMXLIB environment variable.
            * **gmx_path** (*str*) - ("gmx") Path to the GROMACS executable binary.
            * **remove_tmp** (*bool*) - (True) [WF property] Remove temporal files.
            * **restart** (*bool*) - (False) [WF property] Do not execute if output files exist.
            * **container_path** (*str*) - (None)  Path to the binary executable of your container.
            * **container_image** (*str*) - ("gromacs/gromacs:latest") Container Image identifier.
            * **container_volume_path** (*str*) - ("/data") Path to an internal directory in the container.
            * **container_working_dir** (*str*) - (None) Path to the internal CWD in the container.
            * **container_user_id** (*str*) - (None) User number id to be mapped inside the container.
            * **container_shell_path** (*str*) - ("/bin/bash") Path to the binary executable of the container shell.

    Examples:
        This is a use example of how to use the building block from Python::

            from biobb_md.gromacs.genion import genion
            prop = { 'concentration': 0.05,
                     'replaced_group': 'SOL'}
            genion(input_tpr_path='/path/to/myPortableBinaryRunInputFile.tpr',
                   output_gro_path='/path/to/newStructure.gro',
                   input_top_zip_path='/path/to/myTopology.zip',
                   output_top_zip_path='/path/to/newTopology.zip',
                   properties=prop)

    Info:
        * wrapped_software:
            * name: GROMACS Genion
            * version: >5.1
            * license: LGPL 2.1
        * ontology:
            * name: EDAM
            * schema: http://edamontology.org/EDAM.owl
    """
    def __init__(self, input_tpr_path: str, output_gro_path: str, input_top_zip_path: str,
                 output_top_zip_path: str, input_ndx_path: str = None, properties: dict = None, **kwargs) -> None:
        properties = properties or {}

        # Call parent class constructor
        super().__init__(properties)

        # Input/Output files
        self.io_dict = {
            "in": {"input_tpr_path": input_tpr_path, "input_ndx_path": input_ndx_path},
            "out": {"output_gro_path": output_gro_path, "output_top_zip_path": output_top_zip_path}
        }
        # Should not be copied inside container
        self.input_top_zip_path = input_top_zip_path

        # Properties specific for BB
        self.output_top_path = properties.get('output_top_path', 'gio.top')  # Not in documentation for clarity
        self.replaced_group = properties.get('replaced_group', 'SOL')
        self.neutral = properties.get('neutral', False)
        self.concentration = properties.get('concentration', 0.05)
        self.seed = properties.get('seed', 1993)

        # Properties common in all GROMACS BB
        self.gmx_lib = properties.get('gmx_lib', None)
        self.gmx_path = properties.get('gmx_path', 'gmx')
        self.gmx_nobackup = properties.get('gmx_nobackup', True)
        self.gmx_nocopyright = properties.get('gmx_nocopyright', True)
        if self.gmx_nobackup:
            self.gmx_path += ' -nobackup'
        if self.gmx_nocopyright:
            self.gmx_path += ' -nocopyright'
        if not self.container_path:
            self.gmx_version = get_gromacs_version(self.gmx_path)

        # Check the properties
        self.check_properties(properties)

    @launchlogger
    def launch(self) -> int:
        """Execute the :class:`Genion <gromacs.genion.Genion>` object."""

        # Setup Biobb
        if self.check_restart(): return 0
        self.stage_files()

        # Unzip topology to topology_out
        top_file = fu.unzip_top(zip_file=self.input_top_zip_path, out_log=self.out_log)
        top_dir = str(Path(top_file).parent)

        if self.container_path:
            shutil.copytree(top_dir, Path(self.stage_io_dict.get("unique_dir")).joinpath(Path(top_dir).name))
            top_file = str(Path(self.container_volume_path).joinpath(Path(top_dir).name, Path(top_file).name))

        self.cmd = ['echo', '\"'+self.replaced_group+'\"', '|',
                    self.gmx_path, 'genion',
                    '-s', self.stage_io_dict["in"]["input_tpr_path"],
                    '-o', self.stage_io_dict["out"]["output_gro_path"],
                    '-p', top_file]

        if self.stage_io_dict["in"].get("input_ndx_path") and Path(
                self.stage_io_dict["in"].get("input_ndx_path")).exists():
            self.cmd.append('-n')
            self.cmd.append(self.stage_io_dict["in"].get("input_ndx_path"))

        if self.neutral:
            self.cmd.append('-neutral')

        if self.concentration:
            self.cmd.append('-conc')
            self.cmd.append(str(self.concentration))
            fu.log('To reach up %g mol/litre concentration' % self.concentration, self.out_log, self.global_log)

        if self.seed is not None:
            self.cmd.append('-seed')
            self.cmd.append(str(self.seed))

        if self.gmx_lib:
            self.environment = os.environ.copy()
            self.environment['GMXLIB'] = self.gmx_lib

        # Check GROMACS version
        if not self.container_path:
            if self.gmx_version < 512:
                raise GromacsVersionError("Gromacs version should be 5.1.2 or newer %d detected" % self.gmx_version)
            fu.log("GROMACS %s %d version detected" % (self.__class__.__name__, self.gmx_version), self.out_log)

        # Run Biobb block
        self.run_biobb()

        # Copy files to host
        self.copy_to_host()

        if self.container_path:
            top_file = str(Path(self.stage_io_dict.get("unique_dir")).joinpath(Path(top_dir).name, Path(top_file).name))

        # zip topology
        fu.log('Compressing topology to: %s' % self.stage_io_dict["out"]["output_top_zip_path"],
               self.out_log, self.global_log)
        fu.zip_top(zip_file=self.io_dict["out"]["output_top_zip_path"], top_file=top_file, out_log=self.out_log)

        # Remove temporal files
        self.tmp_files.extend([self.stage_io_dict.get("unique_dir"), top_dir])
        self.remove_tmp_files()

        return self.return_code


def genion(input_tpr_path: str, output_gro_path: str, input_top_zip_path: str,
           output_top_zip_path: str, properties: dict = None, **kwargs) -> int:
    """Create :class:`Genion <gromacs.genion.Genion>` class and
        execute the :meth:`launch() <gromacs.genion.Genion.launch>` method."""
    return Genion(input_tpr_path=input_tpr_path, output_gro_path=output_gro_path,
                  input_top_zip_path=input_top_zip_path, output_top_zip_path=output_top_zip_path,
                  properties=properties, **kwargs).launch()


def main():
    """Command line execution of this building block. Please check the command line documentation."""
    parser = argparse.ArgumentParser(description="Wrapper for the GROMACS genion module.",
                                     formatter_class=lambda prog: argparse.RawTextHelpFormatter(prog, width=99999))
    parser.add_argument('-c', '--config', required=False, help="This file can be a YAML file, JSON file or JSON string")

    # Specific args of each building block
    required_args = parser.add_argument_group('required arguments')
    required_args.add_argument('--input_tpr_path', required=True)
    required_args.add_argument('--output_gro_path', required=True)
    required_args.add_argument('--input_top_zip_path', required=True)
    required_args.add_argument('--output_top_zip_path', required=True)

    args = parser.parse_args()
    config = args.config if args.config else None
    properties = settings.ConfReader(config=config).get_prop_dic()

    # Specific call of each building block
    genion(input_tpr_path=args.input_tpr_path, output_gro_path=args.output_gro_path,
           input_top_zip_path=args.input_top_zip_path, output_top_zip_path=args.output_top_zip_path,
           properties=properties)


if __name__ == '__main__':
    main()
