from django.core.management.base import BaseCommand, CommandError

from django.contrib.auth.models import User, Group

from optparse import make_option

from sys import stdout

from csv import writer

FORMATS = [

    'address',

    'google',

    'outlook',

    'linkedin',

    'vcard',

]

def full_name(first_name, last_name, username, **extra):

    name = u" ".join(n for n in [first_name, last_name] if n)

    if not name: return username

    return name

class Command(BaseCommand):

    option_list = BaseCommand.option_list + (

        make_option('--group', '-g', action='store', dest='group', default=None,

            help='Limit to users which are part of the supplied group name'),

        make_option('--format', '-f', action='store', dest='format', default=FORMATS[0],

            help="output format. May be one of '" + "', '".join(FORMATS) + "'."),

    )

    help = ("Export user email address list in one of a number of formats.")

    args = "[output file]"

    label = 'filename to save to'

    requires_model_validation = True

    can_import_settings = True

    encoding = 'utf-8' # RED_FLAG: add as an option -DougN

    def handle(self, *args, **options):

        if len(args) > 1:

            raise CommandError("extra arguments supplied")

        group = options['group']

        if group and not Group.objects.filter(name=group).count()==1:

            names = u"', '".join(g['name'] for g in Group.objects.values('name')).encode('utf-8')

            if names: names = "'" + names + "'."

            raise CommandError("Unknown group '" + group + "'. Valid group names are: " + names)

        if len(args) and args[0] != '-':

            outfile = file(args[0], 'w')

        else:

            outfile = stdout

        qs = User.objects.all().order_by('last_name', 'first_name', 'username', 'email')

        if group: qs = qs.filter(group__name=group).distinct()

        qs = qs.values('last_name', 'first_name', 'username', 'email')

        getattr(self, options['format'])(qs, outfile)

    def address(self, qs, out):

        """simple single entry per line in the format of:

            "full name" <my@address.com>;

        """

        out.write(u"\n".join(u'"%s" <%s>;' % (full_name(**ent), ent['email']) 

                             for ent in qs).encode(self.encoding))

        out.write("\n")

    def google(self, qs, out):

        """CSV format suitable for importing into google GMail

        """

        csvf = writer(out)

        csvf.writerow(['Name', 'Email'])

        for ent in qs:

            csvf.writerow([full_name(**ent).encode(self.encoding), 

                           ent['email'].encode(self.encoding)])

    def outlook(self, qs, out):

        """CSV format suitable for importing into outlook

        """

        csvf = writer(out)

        columns = ['Name','E-mail Address','Notes','E-mail 2 Address','E-mail 3 Address',

                   'Mobile Phone','Pager','Company','Job Title','Home Phone','Home Phone 2',

                   'Home Fax','Home Address','Business Phone','Business Phone 2',

                   'Business Fax','Business Address','Other Phone','Other Fax','Other Address']

        csvf.writerow(columns)

        empty = [''] * (len(columns) - 2)

        for ent in qs:

            csvf.writerow([full_name(**ent).encode(self.encoding), 

                           ent['email'].encode(self.encoding)] + empty)

    def linkedin(self, qs, out):

        """CSV format suitable for importing into linkedin Groups.

        perfect for pre-approving members of a linkedin group.

        """

        csvf = writer(out)

        csvf.writerow(['First Name', 'Last Name', 'Email'])

        for ent in qs:

            csvf.writerow([ent['first_name'].encode(self.encoding), 

                           ent['last_name'].encode(self.encoding), 

                           ent['email'].encode(self.encoding)])

    def vcard(self, qs, out):

        try:

            import vobject

        except ImportError:

            print self.style.ERROR_OUTPUT("Please install python-vobject to use the vcard export format.")

            import sys

            sys.exit(1)

        for ent in qs:

            card = vobject.vCard()

            card.add('fn').value = full_name(**ent)

            if not ent['last_name'] and not ent['first_name']:

                # fallback to fullname, if both first and lastname are not declared

                card.add('n').value = vobject.vcard.Name(full_name(**ent))

            else:

                card.add('n').value = vobject.vcard.Name(ent['last_name'], ent['first_name'])

            emailpart = card.add('email')

            emailpart.value = ent['email']

            emailpart.type_param = 'INTERNET'

            out.write(card.serialize().encode(self.encoding))