#!/usr/bin/env python

# pywws - Python software for USB Wireless Weather Stations
# http://github.com/jim-easterbrook/pywws
# Copyright (C) 2008-14  Jim Easterbrook  jim@jim-easterbrook.me.uk

# This program 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 2
# of the License, or (at your option) any later version.

# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

"""Regenerate hourly and daily summary data.

This script can also be run with the ``pywws-reprocess`` command. ::
%s
This program recreates the calibrated, hourly, daily and monthly
summary data that is created by the :py:mod:`pywws.Process` module. It
should be run whenever you upgrade to a newer version of pywws (if the
summary data format has changed), change your calibration module or
alter your pressure offset.

The ``-u`` (or ``--update``) option is a special case. It should be
used when upgrading from any pywws version earlier than 14.02.dev1143.
Unlike normal reprocessing, the ``-u`` option changes your raw data.
You are advised to backup your data before using the ``-u`` option.

"""

from __future__ import absolute_import

__docformat__ = "restructuredtext en"
__usage__ = """
 usage: %s [options] data_dir
 options are:
  -h | --help     display this help
  -u | --update   update status on old data to include bits from wind_dir byte
  -v | --verbose  increase number of informative messages
 data_dir is the root directory of the weather data
"""
__doc__ %= __usage__ % ('python -m pywws.Reprocess')

import getopt
import logging
import os
import sys

from . import DataStore
from .Logger import ApplicationLogger
from . import Process

def Reprocess(data_dir, update):
    logger = logging.getLogger('pywws.Reprocess')
    raw_data = DataStore.data_store(data_dir)
    if update:
        # update old data to copy high nibble of wind_dir to status
        logger.warning("Updating status to include extra bits from wind_dir")
        count = 0
        for data in raw_data[:]:
            count += 1
            idx = data['idx']
            if count % 10000 == 0:
                logger.info("update: %s", idx.isoformat(' '))
            elif count % 500 == 0:
                logger.debug("update: %s", idx.isoformat(' '))
            if data['wind_dir'] is not None:
                if data['wind_dir'] >= 16:
                    data['status'] |= (data['wind_dir'] & 0xF0) << 4
                    data['wind_dir'] &= 0x0F
                    raw_data[idx] = data
                if data['status'] & 0x800:
                    data['wind_dir'] = None
                    raw_data[idx] = data
        raw_data.flush()
    # delete old format summary files
    logger.warning('Deleting old summaries')
    for summary in ['calib', 'hourly', 'daily', 'monthly']:
        for root, dirs, files in os.walk(
                os.path.join(data_dir, summary), topdown=False):
            logger.info(root)
            for file in files:
                os.unlink(os.path.join(root, file))
            os.rmdir(root)
    # create data summaries
    logger.warning('Generating hourly and daily summaries')
    params = DataStore.params(data_dir)
    calib_data = DataStore.calib_store(data_dir)
    hourly_data = DataStore.hourly_store(data_dir)
    daily_data = DataStore.daily_store(data_dir)
    monthly_data = DataStore.monthly_store(data_dir)
    Process.Process(
        params,
        raw_data, calib_data, hourly_data, daily_data, monthly_data)
    return 0

def main(argv=None):
    if argv is None:
        argv = sys.argv
    usage = (__usage__ % (argv[0])).strip()
    try:
        opts, args = getopt.getopt(
            argv[1:], "huv", ['help', 'update', 'verbose'])
    except getopt.error, msg:
        print >>sys.stderr, 'Error: %s\n' % msg
        print >>sys.stderr, usage
        return 1
    # process options
    update = False
    verbose = 0
    for o, a in opts:
        if o in ('-h', '--help'):
            print __doc__.split('\n\n')[0]
            print usage
            return 0
        elif o in ('-u', '--update'):
            update = True
        elif o in ('-v', '--verbose'):
            verbose += 1
    # check arguments
    if len(args) != 1:
        print >>sys.stderr, 'Error: 1 argument required\n'
        print >>sys.stderr, usage
        return 2
    logger = ApplicationLogger(verbose)
    data_dir = args[0]
    return Reprocess(data_dir, update)

if __name__ == "__main__":
    sys.exit(main())
