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

# Copyright (C) 2010 Matías Ribecky <matias at mribecky.com.ar>
# Copyright (C) 2010 Toms Bauģis <toms.baugis@gmail.com>

# This file is part of Project Hamster.

# Project Hamster is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# Project Hamster is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with Project Hamster.  If not, see <http://www.gnu.org/licenses/>.

'''A script to control the applet from the command line.'''

import sys, os
import optparse
import re
import datetime as dt

from hamster import client
from hamster.lib import stuff

class ConfigurationError(Exception):
    '''An error of configuration.'''
    pass

class HamsterClient(object):
    '''The main application.'''

    def __init__(self):
        self.storage = client.Storage()

    def toggle(self):
        self.storage.toggle()


    def start_tracking(self, activity, start_time = None, end_time = None):
        '''Start a new activity.'''
        self.storage.add_fact(stuff.Fact(activity,
                                         start_time = start_time,
                                         end_time = end_time))


    def stop_tracking(self):
        '''Stop tracking the current activity.'''
        self.storage.stop_tracking()



    def list(self, start_time = None, end_time = None):
        '''Print a listing of activities.'''

        start_time = start_time or dt.datetime.combine(dt.date.today(), dt.time())
        end_time = end_time or start_time.replace(hour=23, minute=59, second=59)


        headers = {'activity': _("Activity"),
                   'category': _("Category"),
                   'tags': _("Tags"),
                   'start': _("Start"),
                   'end': _("End"),
                   'duration': _("Duration")}
        line_fmt = ' %*s - %*s (%*s) | %s@%s %s'


        print_with_date = start_time.date() != start_time.date()
        if print_with_date:
            dates_align_width = len('xxxx-xx-xx xx:xx')
        else:
            dates_align_width = len('xx:xx')

        column_width = {'start': max(len(headers['start']), dates_align_width),
                        'end':   max(len(headers['end']), dates_align_width),
                        'duration': max(len(headers['duration']), 7)}

        print line_fmt % (column_width['start'], headers['start'],
                          column_width['end'], headers['end'],
                          column_width['duration'], headers['duration'],
                          headers['activity'],
                          headers['category'],
                          headers['tags'])
        first_column_width = (8 + sum(column_width.values()))
        second_column_width = 4 + len(headers['activity']) + \
                              len(headers['category']) + \
                              len(headers['tags'])

        print "%s+%s" % ('-' * first_column_width, '-' * second_column_width)
        for fact in self.storage.get_facts(start_time, end_time, ""):
            if fact.start_time < start_time or fact.start_time > end_time:
                # Hamster returns activities for the whole day, not just the
                # time range we sent
                # TODO - why should that be a problem? /toms/
                continue

            fact_data = fact_dict(fact, print_with_date)
            print line_fmt % (column_width['start'], fact_data['start'],
                              column_width['end'], fact_data['end'],
                              column_width['duration'], fact_data['duration'],
                              fact_data['activity'],
                              fact_data['category'],
                              fact_data['tags'])

    def list_activities(self):
        '''Print the names of all the activities.'''
        for activity in self.storage.get_activities():
            print '%s@%s' % (activity['name'].encode('utf8'), activity['category'].encode('utf8'))

    def list_categories(self):
        '''Print the names of all the categories.'''
        for category in self.storage.get_categories():
            print category['name'].encode('utf8')


def parse_datetime_range(time):
    '''Parse starting and ending datetime separated by a '-'.'''
    start_time, remainder = parse_datetime(time)

    end_time = None
    if remainder and remainder.startswith("-"):
        end_time, remainder = parse_datetime(remainder[1:])

    return start_time, end_time

_DATETIME_PATTERN = ('^((?P<relative>-)?|'
                       '(?P<year>\d{4})'
                       '(-(?P<month>\d{1,2})'
                        '(-(?P<day>\d{1,2}))?)? )?'
                     '((?P<hour>\d{1,2}):)?'
                     '(?P<minute>\d{1,2})'
                     '(:(?P<second>\d{1,2}))?'
                     '(?P<rest>\D.+)?$')
_DATETIME_REGEX = re.compile(_DATETIME_PATTERN)

def parse_datetime(arg):
    '''Parse a date and time.'''
    match = _DATETIME_REGEX.match(arg)
    if not match:
        return dt.datetime.now(), arg

    if match.groupdict()['relative']:
        hour = int(match.groupdict()['hour'] or 0)
        minute = int(match.groupdict()['minute'])
        second = int(match.groupdict()['second'] or 0)
        time_ago = dt.timedelta(hours=hour,
                                      minutes=minute,
                                      seconds=second)
        rest = (match.groupdict()['rest'] or '').strip()
        return dt.datetime.now() - time_ago, rest
    else:
        date = dt.datetime.now().date()
        try:
            if match.groupdict()['year']:
                date = date.replace(year=int(match.groupdict()['year']))
                if match.groupdict()['month']:
                    date = date.replace(month=int(match.groupdict()['month']))
                    if match.groupdict()['day']:
                        date = date.replace(day=int(match.groupdict()['day']))
            time = dt.time(hour=int(match.groupdict()['hour'] or 0),
                                 minute=int(match.groupdict()['minute']),
                                 second=int(match.groupdict()['second'] or 0))
        except ValueError, err:
            if match.groupdict()['rest']:
                date_str = arg[:-len(match.groupdict()['rest'])]
            else:
                date_str = arg

            raise ConfigurationError(_("invalid date/time '%s'" % date_str))
        rest = (match.groupdict()['rest'] or '').strip()
        return dt.datetime.combine(date, time), rest

def fact_dict(fact_data, with_date):
    fact = {}
    if with_date:
        fmt = '%Y-%m-%d %H:%M'
    else:
        fmt = '%H:%M'

    fact['start'] = fact_data.start_time.strftime(fmt)
    if fact_data.end_time:
        fact['end'] = fact_data.end_time.strftime(fmt)
    else:
        end_date = dt.datetime.now()
        fact['end'] = ''

    fact['duration'] = stuff.format_duration(fact_data.delta)

    fact['activity'] = fact_data.activity
    fact['category'] = fact_data.category
    if fact_data.tags:
        fact['tags'] = ' '.join('#%s' % tag for tag in fact_data.tags)
    else:
        fact['tags'] = ''
    return fact


if __name__ == '__main__':
    from hamster.lib import i18n
    i18n.setup_i18n()

    usage = _(
"""Client for controlling the hamster-applet. Usage:
  %(prog)s start ACTIVITY [START_TIME[-END_TIME]]
  %(prog)s stop
  %(prog)s list [START_TIME[-END_TIME]]

Actions:
    * start (default): Start tracking an activity.
    * stop: Stop tracking current activity.
    * list: List activities.
    * list-activities: List all the activities names, one per line.
    * list-categories: List all the categories names, one per line.

Time formats:
    * 'YYYY-MM-DD hh:mm:ss': Absolute time. Defaulting to 0 for the time
            values missing, and current day for date values.
            E.g. (considering 2010-03-09 16:30:20 as current date, time):
                2010-03 13:15:40 is 2010-03-09 13:15:40
                2010-03-09 13:15 is 2010-03-09 13:15:00
                2010-03-09 13    is 2010-03-09 00:13:00
                2010-02 13:15:40 is 2010-02-09 13:15:40
                13:20            is 2010-03-09 13:20:00
                20               is 2010-03-09 00:20:00
    * '-hh:mm:ss': Relative time. From the current date and time. Defaulting
            to 0 for the time values missing, same as in absolute time.

""")


    # CLI Structure: ./hamster-cli.py <start|stop|list|...> <conditional_args>

    if len(sys.argv) < 2:
        sys.exit(usage % {'prog': sys.argv[0]})

    command, args = sys.argv[1], sys.argv[2:]

    if command in ("toggle", "start", "stop", "list", "list-activities", "list-categories"):
        hamster_client = HamsterClient()

        if command == 'toggle':
            hamster_client.toggle()

        elif command == 'start':
            if not args: # mandatory is only the activity name
                sys.exit(usage % {'prog': sys.argv[0]})

            activity = args[0]

            start_time, end_time = None, None
            if len(args) > 1:
                start_time, end_time = parse_datetime_range(args[1])

                if start_time > dt.datetime.now() or (end_time and end_time > dt.datetime.now()):
                    sys.exit("Activity must start and finish before current time")

            hamster_client.start_tracking(activity, start_time, end_time)

        elif command == 'stop':
            hamster_client.stop_tracking()

        elif command == 'list':
            start_time, end_time = None, None
            if args:
                start_time, end_time = parse_datetime_range(args[0])

            hamster_client.list(start_time, end_time)

        elif command == 'list-activities':
            hamster_client.list_activities()

        elif command == 'list-categories':
            hamster_client.list_categories()

    else:
        # unknown command - print usage, go home
        sys.exit(usage % {'prog': sys.argv[0]})