"""
Created on 19.02.2015

@author: frank
"""
import os
import json
import numpy as np

import objsimpy.geom as geom
from objsimpy.gitrepo import get_sha1_of_latest_commit
from objsimpy.stim.stim_movie import StimulusSet
from objsimpy.stim.stim_movie import write_meta_xml

def main():
    generate_ori_stim(os.path.join(os.environ.get('HOME'), 
                                   'tmp', 
                                   'raised_cos_oriphi_o20_a20_p20_fwhm2.5.idlmov'), 
                      output_size=20, 
                      n_angles=20, 
                      n_phases=20,
                      fwhm=2.5)

def generate_ori_stim(file_path, 
                      output_size=20, 
                      n_angles=20,
                      n_phases=20,
                      fwhm=3.0):
    generator_args = locals()
    write_meta_files(file_path, n_angles, n_phases, __file__, 'generate_ori_stim', generator_args)
        
    center = 0.5*np.array([output_size, output_size]) - 0.5
    phase_positions = np.linspace(0, output_size-1, n_phases) - 0.5*output_size + 0.5
    angles = np.linspace(0, 180, n_angles, endpoint=False)
    pic_list = []
    for angle in angles:
        normal_angle = angle + 90
        normal_dx_dy = np.array([np.cos(geom.deg_to_rad(normal_angle)), 
                                 np.sin(geom.deg_to_rad(normal_angle))])
        for phase in phase_positions:
            pos = center + normal_dx_dy * phase
            cos_filter = geom.cos2d(20, pos, fwhm=2.5, line_angle_deg=angle)
            pic_list.append(cos_filter)
    stim_set = StimulusSet(pics=pic_list)
    stim_set.save(file_path)
    
def write_meta_files(file_path, nx, ny, source_file, generator_name, generator_args):
    toplevel, sha1 = get_sha1_of_latest_commit(source_file)
    meta_dict = {'MovieMetaFile': 
                 {'StimParas': {'MovieFileName': os.path.basename(file_path),
                                'NXParas': nx,
                                'NYParas': ny,
                                },
                  'Generator': {'FunctionName': generator_name,
                                'SourceFile': os.path.relpath(source_file, toplevel),
                                'SHA1': sha1,
                                'Args': generator_args
                                },
                  }
                 }
    
    fname_json = os.path.splitext(file_path)[0] + '.meta.json'
    with open(fname_json, 'w') as fobj_json:
        fobj_json.write(json.dumps(meta_dict, indent=4))

    fname_meta = os.path.splitext(file_path)[0] + '.meta.xml'
    write_meta_xml(meta_dict, fname_meta)
    
 
    

if __name__ == '__main__':
    main()