# -*- coding: utf-8 -*-

import datetime
import os
import random
#import argparse
from optparse import make_option


from django.core.management.base import BaseCommand
from django.core.management import call_command
from django.conf import settings
from django.db import transaction
import django.contrib.auth
from django.utils.encoding import force_unicode

from seminar.models import Skola, Resitel, Rocnik, Cislo, Problem, Reseni, PrilohaReseni, Nastaveni
from seminar.testutils import create_test_data
from seminar import ovvpfile

User = django.contrib.auth.get_user_model()


class Command(BaseCommand):
    help = "Import (add / notice changes) schools from a ovvp-format file (skoly.csv)"

    option_list = BaseCommand.option_list + (
            make_option('-n', '--dry_run', dest='dry_run', default=False,
                        action='store_true', help="No changes to DB."),
            )
#    def add_arguments(self, parser):
#        parser.add_argument('file', nargs='?', type=argparse.FileType('r', encoding='utf8'), default=sys.stdin)
#        parser.add_argument('-n', '--dry_run', dest='dry_run', default=False,
#                            action='store_true', type=bool, help="No changes to DB.")

    def school_diffs(self, ovvpskola, dbskola):
        def compare(ovvpcol, dbcol, t=unicode):
            v1 = t(dbskola.__getattribute__(dbcol))
            v2 = ovvpskola[ovvpcol]
            if unicode(v1) != unicode(v2):
                return "%s: '%s'->'%s', " % (ovvpcol, v1, v2, )
            return ""

        diff = ""
        diff += compare('name','nazev')
        diff += compare('street','ulice')
        diff += compare('town','mesto')
        diff += compare('postcode','psc')
        return diff

    def handle(self, *args, **options):
        assert len(args) == 1

        filename = args[0]
        self.stdout.write(
            'Parsing OVVP/OPMK-format file \'%s\' ...' % (filename, )
        )
        with open(filename, "r") as f:
            o = ovvpfile.parse(f)

        assert o.headers['version'] == '1'
        self.stdout.write('Read %d schools with columns: %s' % (len(o.rows), o.columns, ))
        self.stdout.write('Export created: %s' % (o.headers.get('date', 'N/A'), ))
        assert 'id-aesop' in o.columns

        same = 0
        modified = 0
        new = 0

        with transaction.atomic():
            for skola in o.rows:
                aesop_id = 'aesop:%s' % (skola['id-aesop'], )
                found = Skola.objects.filter(aesop_id=aesop_id)
                assert len(found) <= 1

                if found:
                    fs = found[0]
                    diff = self.school_diffs(skola, fs)
                    if diff:
                        modified += 1
                        self.stdout.write(u"M %11s %s" % (aesop_id, diff, )) # TODO
                    else:
                        same += 1
                        if int(skola['is-SS']) > int(fs.je_ss):
                            fs.je_ss = True
                            fs.save()

                        if int(skola['is-ZS']) > int(fs.je_zs):
                            fs.je_zs = True
                            fs.save()

                else:
                    new += 1
                    # Name duplicates?
                    by_name = Skola.objects.filter(nazev=skola['name'], mesto=skola['town'], ulice=skola['street'])
                    if len(by_name) > 0:
                        self.stdout.write(u"W Same [name, street, town] for %s and %s (%s, %s, %s)" % (
                                by_name[0].aesop_id, aesop_id, skola['name'], skola['street'], skola['town'], ))
                    else:
                        self.stdout.write(u"+ %11s %s, %s, %s" % (aesop_id, skola['name'], skola['town'], skola['country'], ))
                        if not options['dry_run']:
                            newskola = Skola.objects.create(
                                aesop_id=aesop_id, nazev=skola['name'], kratky_nazev=skola['name'], izo=skola.get('id-izo', ''),
                                ulice=skola['street'], mesto=skola['town'], psc=skola['postcode'], stat=skola['country'],
                                je_zs=int(skola['is-ZS']), je_ss=int(skola['is-SS']),
                                )

        self.stdout.write("Result: %d same, %d different, %d new schools" % (same, modified, new, ))