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# Source code for pywws.EWtoPy

    #!/usr/bin/env python

    # pywws - Python software for USB Wireless Weather Stations
    # http://github.com/jim-easterbrook/pywws
    # Copyright (C) 2008-13  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.

    """Convert EasyWeather.dat data to pywws format
    ::

    %s

    Introduction
    ------------

    This program converts data from the format used by the EasyWeather
    program supplied with the weather station to the format used by pywws.
    It is useful if you've been using EasyWeather for a while before
    discovering pywws.

    The ``EasyWeather.dat`` file is only used to provide data from before
    the start of the pywws data. As your weather station has its own
    memory, you should run :py:mod:`pywws.LogData` before
    :py:mod:`pywws.EWtoPy` to minimise use of the EasyWeather.dat file.

    :py:mod:`pywws.EWtoPy` converts the time stamps in EasyWeather.dat
    from local time to UTC. This can cause problems when daylight savings
    time ends, as local time appears to jump back one hour. The program
    attempts to detect this and correct the affected time stamps, but I
    have not been able to test this on a variety of time zones.

    Detailed API
    ------------

    """

    __docformat__ = "restructuredtext en"
    __usage__ = """
     usage: python -m pywws.EWtoPy [options] EasyWeather_file data_dir
     options are:
      -h or --help    display this help
     EasyWeather_file is the input data file, e.g. EasyWeather.dat
     data_dir is the root directory of the weather data
    """
    __doc__ %= __usage__
    __usage__ = __doc__.split('\n')[0] + __usage__

    from datetime import datetime, timedelta
    import getopt
    import os
    import sys

    from pywws import DataStore
    from pywws import TimeZone

    def main(argv=None):
        if argv is None:
            argv = sys.argv
        try:
            opts, args = getopt.getopt(argv[1:], "h", ['help'])
        except getopt.error, msg:
            print >>sys.stderr, 'Error: %s\n' % msg
            print >>sys.stderr, __usage__.strip()
            return 1
        # process options
        for o, a in opts:
            if o in ('-h', '--help'):
                print >>sys.stderr, __usage__.strip()
                return 0
        # check arguments
        if len(args) != 2:
            print >>sys.stderr, 'Error: 2 arguments required\n'
            print >>sys.stderr, __usage__.strip()
            return 2
        # process arguments
        in_name = args[0]
        out_name = args[1]
        # open input
        in_file = open(in_name, 'r')
        # open data file store
        ds = DataStore.data_store(out_name)
        # get time to go forward to
        first_stored = ds.after(datetime.min)
        if first_stored == None:
            first_stored = datetime.max
        # copy any missing data
        last_date = None
        count = 0
        for line in in_file:
            items = line.split(',')
            local_date = DataStore.safestrptime(items[2].strip(), '%Y-%m-%d %H:%M:%S')
            local_date = local_date.replace(tzinfo=TimeZone.Local)
            date = local_date.astimezone(TimeZone.utc)
            if last_date and date < last_date:
                date = date + timedelta(hours=1)
                print "Corrected DST ambiguity %s %s -> %s" % (
                    local_date, local_date.tzname(), date)
            last_date = date
            date = date.replace(tzinfo=None)
            # get data
            data = {}
            data['delay'] = int(items[3])
            data['hum_in'] = int(items[4])
            data['temp_in'] = float(items[5])
            try:
                data['hum_out'] = int(items[6])
            except:
                data['hum_out'] = None
            try:
                data['temp_out'] = float(items[7])
            except:
                data['temp_out'] = None
            data['abs_pressure'] = float(items[10])
            try:
                data['wind_ave'] = float(items[12])
            except:
                data['wind_ave'] = None
            try:
                data['wind_gust'] = float(items[14])
            except:
                data['wind_gust'] = None
            try:
                data['wind_dir'] = int(items[16])
            except:
                data['wind_dir'] = None
            data['rain'] = int(items[18]) * 0.3
            data['status'] = int(items[35].split()[15], 16)
            # check against first_stored
            if first_stored - date < timedelta(minutes=data['delay'] // 2):
                break
            ds[date] = data
            count += 1
        print "%d records written" % count
        in_file.close()
        del ds
        return 0

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

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