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('CTRL{subject}/anat/CTRL{subject}_T1w')
    t2w = create_key('CTRL{subject}/anat/CTRL{subject}_acq-tse_T2w')
    func_task1= create_key('CTRL{subject}/func/CTRL{subject}_task_run-00{item:01d}_bold')
    func_task2= create_key('CTRL{subject}/func/CTRL{subject}_task_run-00{item:01d}_bold')

    info = {t1w: [], t2w: [], func_task1: [], func_task2: []}
    #last_run = len(seqinfo)
    
    #for idx, s in enumerate(seqinfo):


    for s in enumerate(seqinfo):
 
        if (s.dim1 == 256) and (s.TR == 2.3):
            info[t1w] = append(s.series_id)

        if (s.dim1 == 512) and (s.dim2 == 408):
           info[t2w] = append(s.series_id)
        
        if (s.dim1 == 72) and ('run1' in s.dcm_dir_name):
            info[func_task1] = append(s.series_id)

        if (s.dim1 == 72) and ('run2' in s.dcm_dir_name):
            info[func_task2] = append(s.series_id)

    return info