#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""Iterates over a bunch of .jpg or .cr2 files and matches 
DateTimeOriginal from Exif tag to DateTime in a csv log 
of a GeigerMuellerCounter."""

from datetime import datetime
from PIL import Image
import math
import piexif
import piexif.helper

# Constants
# 320  series: 0.0065   µSv/h / CPM
SIFACTOR = 0.0065 

# Temp constants
RAD = "0,15"

# Import GeigerCounter data
with open("testdata/TKRZ.hisdb.his", "r") as f:
    for line in f:
        if line[0] != '#':
            columns = line.split(',')
            csvrawtime = columns[1].lstrip()
            csvrawcpm = columns[2].lstrip()
            csvrawrad = round(float(csvrawcpm) * SIFACTOR, 2)
            csvisotime = datetime.fromisoformat(csvrawtime)
            # Print with 2 digits after dot and unit of measurement
            print(csvisotime, csvrawrad, "µS/h")

# Load Image and EXIF data
im = Image.open("testdata/test.jpg")
exif_dict = piexif.load(im.info["exif"])

picrawtime = exif_dict["Exif"][piexif.ExifIFD.DateTimeOriginal].decode('ASCII')
picisotime = datetime.strptime(picrawtime, "%Y:%m:%d %H:%M:%S")

print(picisotime)

# convert str to exif compatible string
new_comment = "Radiation ☢ " + RAD + " µS/h"
user_comment = piexif.helper.UserComment.dump(new_comment, encoding="unicode")
exif_dict["Exif"][piexif.ExifIFD.UserComment] = user_comment

# compile and write tags
print("Going to write comment: " + new_comment)
exif_bytes = piexif.dump(exif_dict)
#im.save("test.jpg", exif=exif_bytes)