#!/usr/bin/env python
################################################################################
##
## Copyright 2015 - 2016, Paul Beckingham, Federico Hernandez.
##
## Permission is hereby granted, free of charge, to any person obtaining a copy
## of this software and associated documentation files (the "Software"), to deal
## in the Software without restriction, including without limitation the rights
## to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
## copies of the Software, and to permit persons to whom the Software is
## furnished to do so, subject to the following conditions:
##
## The above copyright notice and this permission notice shall be included
## in all copies or substantial portions of the Software.
##
## THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
## OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
## FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
## THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
## LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
## OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
## SOFTWARE.
##
## http:##www.opensource.org/licenses/mit-license.php
##
################################################################################

import sys
import json
import datetime

def formatSeconds(seconds):
  ''' Convert seconds: 3661
      To formatted:    1:01:01
  '''
  hours   = int(seconds / 3600)
  minutes = int(seconds % 3600) / 60
  seconds =     seconds % 60
  return '%4d:%02d:%02d' % (hours, minutes, seconds)


DATEFORMAT = '%Y%m%dT%H%M%SZ'

# Extract the configuration settings.
header = 1
configuration = dict()
body = ''
for line in sys.stdin:
  if header:
    if line == '\n':
      header = 0
    else:
      fields = line.strip().split(': ', 2)
      if len(fields) == 2:
        configuration[fields[0]] = fields[1]
      else:
        configuration[fields[0]] = ''
  else:
    body += line

# Sum the second tracked by tag.
totals = dict()
j = json.loads(body)
for object in j:
  start = datetime.datetime.strptime(object['start'], DATEFORMAT)

  if 'end' in object:
    end = datetime.datetime.strptime(object['end'], DATEFORMAT)
  else:
    end = datetime.datetime.utcnow()

  tracked = end - start

  for tag in object['tags']:
    if tag in totals:
      totals[tag] += tracked
    else:
      totals[tag] = tracked

# Determine largest tag width.
max_width = 0
for tag in totals:
  if len(tag) > max_width:
    max_width = len(tag)

start = datetime.datetime.strptime(configuration['temp.report.start'], DATEFORMAT)
end   = datetime.datetime.strptime(configuration['temp.report.end'],   DATEFORMAT)
if max_width > 0:
  # Compose report header.
  print '\nTotal by Tag, for %s - %s\n' % (start, end)

  # Compose table header.
  if configuration['color'] == 'on':
    print '%-*s %10s' % (max_width, 'Tag', 'Total')
  else:
    print '%-*s %10s' % (max_width, 'Tag', 'Total')
    print '-' * max_width, '----------'

  # Compose table rows.
  grand_total = 0
  for tag in sorted(totals):
    formatted = formatSeconds(totals[tag].seconds)
    grand_total += totals[tag].seconds
    print '%-*s %10s' % (max_width, tag, formatted)

  # Compose total.
  if configuration['color'] == 'on':
    print ' ' * max_width, '          '
  else:
    print ' ' * max_width, '----------'

  print '%-*s %10s' % (max_width, 'Total', formatSeconds(grand_total))

else:
  print 'No data in the range %s - %s' % (start, end)