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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
# vim:syntax=python

"""
This script downloads data from holidata.net and writes it into files in the current directory.
Its output formats are parseable by timewarrior (https://taskwarrior.org/docs/timewarrior/).

This is very alpha. Since holidata.net has a few minor mistakes for Germany I'm writing this to
    test.xx-YY for now (I've just reported these, so allow the guys some time :) ). The files
    are still sourcable with that name :)

Also, for now this script only downloads de-DE. You will notice the complete lack of a main()
    definition, that is the next step: it will also carry parameters so you can download your
    own stuff.

Finally, I'm fixing the ISO-3166-2 violation for North Rhine Westphalia - holidata.net has de-NRW.
    That is the next bug to fix for them :)

tl;dr
SCRIPT IS NOT FINISHED, THIS IS A GIT - USE ONLY IF YOU UNDERSTAND AND IF YOU ARE FROM ZE GERMANY
"""

#import os, sys, re, time, argparse
import json, sys, argparse
reload(sys)
sys.setdefaultencoding('utf8')
from datetime import datetime
from time import sleep

if sys.version_info >= (3, 0):
    from urllib.request import urlopen
    from urllib.error import HTTPError
else:
    from urllib2 import urlopen, HTTPError

__hheader__ = "# File auto-generated by lirion.de's refresh,\n" \
            "# Date: " + datetime.strftime(datetime.now(), "%Y-%m-%d %H:%M:%S %z") + "\n" \
            "# data provided by holidata.net\n\n" \
            "define holidays:\n"

def headwrite(file):
    """
    This writes the default header to the file it is being passed on. Content see
    __hheader__ right above.
    """
    try:   
        open(file, 'w').close()
    except IOError:
        print("Cannot write to %s!", file)
        exit(2)
    with open(file, "a") as ofile:
        #f = open(ofile, "a")
        ofile.write(__hheader__)
 
def hfetch(locode, year):
    """
    This function downloads the holiday data for a given ISO-3166 code from holidata.net
    It will return a single string containing all of the JSON.
    """
    lines = ""
    myurl = "https://holidata.net/" + locode + "/" + year + ".json"
    try:
        lines = urlopen(myurl).read().decode('utf-8')
    except HTTPError as httpe:
        if httpe.code == 404:
            print("holidata.net does not have data for %s, for %s." % (locode, year))
        else:
            print(httpe.code, httpe.read())
    return lines

def hparse(lines, locode, year):
    """
    This function parses the JSON string we expect from holidata.net and writes its fragments to
    the specific region files, if a region is given. So, e.g.: a holiday for all of the US will
    not have a region definition and thus be written to file.en-US, whereas a holiday that is not
    valid for all of the US but is valid for Oregon will be written to file.us-OR.
    """
    islocdef = {}
    for line in lines.split('\n'):
        if line:
            sys.stdout.write(".")
            jdata = json.loads(line)
            mylocale = unicode(jdata['locale'])
            mycountry = mylocale.split('-')[1].lower()
            myregion = unicode(jdata['region'])
            if myregion == "":
                myregion = mylocale.split('-')[1]
            # holidata.net violates ISO-3166-2:DE here:
            if myregion == "NRW":
                myregion = "NW" # or Neustadt/Weinstr., Palz > Pott
            myhlocale = unicode(mycountry + "-" + myregion)
            if jdata['date'] == "":
                print("%s has no date given for %s!", jdata['description'], jdata['locale'])
                mydate = unicode('1970_01_01')
            else:
                mydate = unicode(datetime.strftime(datetime.strptime(jdata['date'], '%Y-%m-%d'),
                    '%Y_%m_%d'))
            myfile = "test." + myhlocale
            if myhlocale not in islocdef:
                headwrite(myfile)
                with open(myfile, "a") as ofile:
                    #f = open(ofile, "a")
                    ofile.write("  " + mycountry + "-" + myregion + ":\n")
                islocdef[myhlocale] = myhlocale
            with open(myfile, "a") as ofile:
                ofile.write("    " + mydate + " = " + unicode(jdata['description']) + "\n")
            sleep(0.1)
            sys.stdout.flush()

def main(args):
    if args.locale != "" and args.locale != None:
        locode = args.locale
    else:
        locode = "de-DE"
    if args.year != None and args.year != []:
        year = args.locale
    else:
        now = datetime.now()
        year = unicode(datetime.now().year)
    sys.stdout.write("Fetching holiday data from holidata.net...")
    sys.stdout.flush()
    lines = hfetch(locode, year)
    print(" done.")
    if lines == "":
        print("No lines returned from holidata.net for %s!", locode)
        exit(3)
    sys.stdout.write("Parsing data")
    sys.stdout.flush()
    hparse(lines, locode, year)
    print(" done.")

if __name__ == "__main__":
    usage = """See https://holidata.net for details of supported locales and regions."""
    parser = argparse.ArgumentParser(description="Update holiday data files. Run 'refresh' for \
        the default of de-DE (this will be changed in the future)")
    parser.add_argument('--locale', nargs='+', help='Specific locale to update', type=unicode, default="")
    parser.add_argument('--region', nargs='+', help='Specific locale region to update', type=unicode, default="")
    parser.add_argument('--year',   nargs='+', help='Specific year to fetch.', type=int, default=[])
    args = parser.parse_args()
    main(args)
    #try:
    #    main(args)
    #except Exception as msg:
    #    print('Error:',msg)