# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
# vi: set ft=python sts=4 ts=4 sw=4 et:
#
# Copyright The NiPreps Developers <nipreps@gmail.com>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#     http://www.apache.org/licenses/LICENSE-2.0
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"""
Multi-echo EPI
~~~~~~~~~~~~~~

For using multi-echo EPI data.

"""

import os

from nipype import logging
from nipype.interfaces.base import (
    CommandLine,
    CommandLineInputSpec,
    File,
    TraitedSpec,
    traits,
)

LOGGER = logging.getLogger('nipype.interface')


class T2SMapInputSpec(CommandLineInputSpec):
    in_files = traits.List(
        File(exists=True),
        argstr='-d %s',
        position=1,
        mandatory=True,
        minlen=3,
        desc='multi-echo BOLD EPIs',
    )
    echo_times = traits.List(
        traits.Float, argstr='-e %s', position=2, mandatory=True, minlen=3, desc='echo times'
    )
    mask_file = File(argstr='--mask %s', position=3, desc='mask file', exists=True)
    fittype = traits.Enum(
        'curvefit',
        'loglin',
        argstr='--fittype %s',
        position=4,
        usedefault=True,
        desc=(
            'Desired fitting method: '
            '"loglin" means that a linear model is fit to the log of the data. '
            '"curvefit" means that a more computationally demanding '
            'monoexponential model is fit to the raw data.'
        ),
    )


class T2SMapOutputSpec(TraitedSpec):
    t2star_map = File(exists=True, desc='limited T2* map')
    s0_map = File(exists=True, desc='limited S0 map')
    optimal_comb = File(exists=True, desc='optimally combined ME-EPI time series')


class T2SMap(CommandLine):
    """
    Runs the tedana T2* workflow to generate an adaptive T2* map and create
    an optimally combined ME-EPI time series.

    Example
    =======

    >>> from fmriprep.interfaces import multiecho
    >>> t2smap = multiecho.T2SMap()
    >>> t2smap.inputs.in_files = ['sub-01_run-01_echo-1_bold.nii.gz',
    ...                           'sub-01_run-01_echo-2_bold.nii.gz',
    ...                           'sub-01_run-01_echo-3_bold.nii.gz']
    >>> t2smap.inputs.echo_times = [0.013, 0.027, 0.043]
    >>> t2smap.cmdline  # doctest: +ELLIPSIS
    't2smap -d sub-01_run-01_echo-1_bold.nii.gz sub-01_run-01_echo-2_bold.nii.gz \
sub-01_run-01_echo-3_bold.nii.gz -e 13.0 27.0 43.0 --fittype curvefit'

    """

    _cmd = 't2smap'
    input_spec = T2SMapInputSpec
    output_spec = T2SMapOutputSpec

    def _format_arg(self, name, trait_spec, value):
        if name == 'echo_times':
            value = [te * 1000 for te in value]
        return super()._format_arg(name, trait_spec, value)

    def _list_outputs(self):
        outputs = self._outputs().get()
        out_dir = os.getcwd()
        outputs['t2star_map'] = os.path.join(out_dir, 'T2starmap.nii.gz')
        outputs['s0_map'] = os.path.join(out_dir, 'S0map.nii.gz')
        outputs['optimal_comb'] = os.path.join(out_dir, 'desc-optcom_bold.nii.gz')
        return outputs
