import calendar
import datetime

def to_fractional_year(d: datetime.datetime) -> float:
    """
    Converts a date stamp to a fractional year (i.e. number like `1939.781`)
    """
    is_leap = calendar.isleap(d.year)
    t = d.timetuple()
    day_of_year = t.tm_yday
    day_time = (60 * 60 * t.tm_hour + 60 * t.tm_min + t.tm_sec) / (24 * 60 * 60)

    days_in_year = 366 if is_leap else 365

    return d.year + ((day_of_year - 1 + day_time) / days_in_year)

def fractional_to_date(fractional):
    eps = 0.0001
    year = int(fractional)
    is_leap = calendar.isleap(year)
    
    modulus = fractional % 1

    days_in_year = 366 if is_leap else 365

    day_of_year =  int( days_in_year * modulus + eps )

    d = datetime.datetime(year, 1,1) + datetime.timedelta(days = day_of_year )

    return d

dates = (datetime.datetime(1825,10,30),
        datetime.datetime(1825,10,31),
        datetime.datetime(1900,1,1),
	datetime.datetime(1900,12,1),
        datetime.datetime(1900,12,31),
        datetime.datetime(1930,2,28),
        datetime.datetime(1932,2,29),
	)

for d in dates:
     inverted = fractional_to_date(to_fractional_year(d))
     assert d == inverted



def convert_to_year_text_format(line):
    _,_,_,fractional_year, _, _,  text_l, text_r = line.split('\t')
    date = fractional_to_date(float(fractional_year)) 
    year = date.year
    month = date.month
    day = date.day
    weekday = date.weekday()
    return f'year: {year} month: {month} day: {day} weekday: {weekday} text: \t' + text_l + '\t' + text_r


def convert_dataset(f_in_path, f_out_path):
    with open(f_in_path,'r') as f_in, open(f_out_path, 'w')  as f_out:
        for line in f_in:
            out = convert_to_year_text_format(line)
            f_out.write(out)

convert_dataset('../dev-0/in.tsv', './dev-0-date.tsv')
convert_dataset('../test-A/in.tsv', './test-A-date.tsv')