import os
def create_key(template, outtype=('nii.gz',), annotation_classes=None):
    if template is None or not template:
        raise ValueError('Template must be a valid format string')
    return template, outtype, annotation_classes
def infotodict(seqinfo):
    """Heuristic evaluator for determining which runs belong where
    allowed template fields - follow python string module:
    item: index within category
    subject: participant id
    seqitem: run number during scanning
    subindex: sub index within group
    """
    t1w = create_key('sub-{subject}/{session}/anat/sub-{subject}_{session}_T1w')
    func_faces = create_key('sub-{subject}/{session}/func/sub-{subject}_{session}_task-faces_bold')
    func_faces_sbref =  create_key('sub-{subject}/{session}/func/sub-{subject}_{session}_task-faces_sbref')
    func_rest = create_key('sub-{subject}/{session}/func/sub-{subject}_{session}_task-rest_bold')
    func_rest_sbref =  create_key('sub-{subject}/{session}/func/sub-{subject}_{session}_task-rest_sbref')
    fmap_mag =  create_key('sub-{subject}/{session}/fmap/sub-{subject}_{session}_magnitude')
    fmap_phase = create_key('sub-{subject}/{session}/fmap/sub-{subject}_{session}_phasediff')
    dwi = create_key('sub-{subject}/{session}/dwi/sub-{subject}_{session}_dwi')

    info = {t1w: [], func_rest: [],  func_faces: [], func_faces_sbref: [],  func_rest: [], func_rest_sbref: [], fmap_mag: [], fmap_phase: [], dwi: []}

    for idx, s in enumerate(seqinfo):
        if (s.dim3 == 192) and ('t1' in s.series_id) and ('NORM' in s.image_type):
                info[t1w].append(s.series_id)
        if (s.dim4 > 1200) and  ('_RS' not in s.series_id) and ('BOLD' in s.protocol_name) and ('TE3' in s.image_type):
                info[func_faces].append(s.series_id)
        if (s.dim4 == 3) and ('SBRef' in s.series_description) and  ('_RS' not in s.series_id) and ('TE3' in s.image_type):
                info[func_faces_sbref].append(s.series_id)
        if (s.dim4 == 1035) and  ('_RS' in s.series_id) and ('BOLD' in s.protocol_name) and ('TE3' in s.image_type):
                info[func_rest].append(s.series_id)
        if (s.dim4 == 3) and  ('_RS' in s.series_id) and ('BOLD' in s.protocol_name) and ('TE3' in s.image_type):
                info[func_rest_sbref].append(s.series_id)
        if (s.dim3 == 120) and (s.dim4 == 1) and ('fieldmap' in s.protocol_name):
                info[fmap_mag] = [s.series_id]
        if (s.dim3 == 60) and (s.dim4 == 1) and ('fieldmap' in s.protocol_name):
                info[fmap_phase] = [s.series_id]
        if (s.dim3 == 76) and (s.dim4 == 131) and ('diff' in s.protocol_name):
                info[dwi].append(s.series_id)
    return info