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import os
import pickle
from collections import defaultdict
import datetime

# load old dict
if os.path.exists('usage_stastic/monthly_stastic/old.dict'):
    with open('usage_stastic/monthly_stastic/old.dict', 'rb') as f:
        old_dict = pickle.load(f)
else:
    old_dict = defaultdict(float)

# get usage data till this month
curr_dict = defaultdict(float)

results = os.popen('ac -p').read().splitlines()

for line in results:
    if not line.startswith('\ttotal '):
        user_name = line.split(' ')[0].split('\t')[1]
        use_time = float(line.split(' ')[-1])

        curr_dict[user_name] += use_time

i = datetime.datetime.now()

# save usage data till now
with open('usage_stastic/monthly_stastic/%s-%s-%s_log.dict' % (i.year, i.month, i.day), 'wb') as f:
    pickle.dump(curr_dict, f)
# rewrite old dict
with open('usage_stastic/monthly_stastic/old.dict', 'wb') as f:
    pickle.dump(curr_dict, f)

# get usage of this month
export_lines = []
delta_dict = defaultdict(float)
for k, v in curr_dict.items():
    delta_dict[k] = v - old_dict[k]
    export_lines.append("%s,%s\n" % (k, v - old_dict[k]))

# save usage of this month
with open('usage_stastic/monthly_reports/monthly report %s-%s-%s.csv' % (i.year, i.month, i.day), 'w+') as f:
    f.write('Username,Usetime(hour)\n')
    [f.write(line) for line in export_lines]