from django import forms
from django.forms.widgets import HiddenInput
import re

EMPTY_VALUES = (None, '')

VAT_CHOICES = (
('','----------'),
('AT','AT-Austria'),
('BE','BE-Belgium'),
('BG','BG-Bulgaria'),
('CY','CY-Cyprus'),
('CZ','CZ-Czech Republic'),
('DE','DE-Germany'),
('DK','DK-Denmark'),
('EE','EE-Estonia'),
('EL','EL-Greece'),
('ES','ES-Spain'),
('FI','FI-Finland'),
('FR','FR-France '),
('GB','GB-United Kingdom'),
('HU','HU-Hungary'),
('IE','IE-Ireland'),
('IT','IT-Italy'),
('LT','LT-Lithuania'),
('LU','LU-Luxembourg'),
('LV','LV-Latvia'),
('MT','MT-Malta'),
('NL','NL-The Netherlands'),
('PL','PL-Poland'),
('PT','PT-Portugal'),
('RO','RO-Romania'),
('SE','SE-Sweden'),
('SI','SI-Slovenia'),
('SK','SK-Slovakia'),
)

class VatWidget(forms.MultiWidget):
    """docstring for VatWidget"""
    def __init__(self,choices=VAT_CHOICES, attrs=None):
        widgets = (
            forms.Select(choices=choices),
            forms.TextInput()
            )
        super(VatWidget, self).__init__(widgets, attrs)

    def value_from_datadict(self, data, files, name):
      	value = [widget.value_from_datadict(data, files, name + '_%s' % i) for i, widget in enumerate(self.widgets)]   
    	try:
    		country, code = value
    		#the spaces and the dots are removed
    		code=code.replace(".","").replace(" ","")
    	except:
        	return data.get(name, None)
        if code not in EMPTY_VALUES:
	    	if country in EMPTY_VALUES:
	    		try:
	    			# ex. code="FR09443710785", country="".
	    			empty, country, code = re.split('([a-zA-Z]+)',code )
	    		except:
	    			return ['', code] 
	    	else:
	    		#ex. code ="FR09443710785", country="FR".
	    		re_code = re.compile(r'^%s(\d+)$' % country)
	    		if re_code.match(code):
	    			code = code.replace(country,"",1)
		try: country = country.upper()
		except:pass
		return [country, code]

    def format_output(self, rendered_widgets):
        return "%s %s" % (rendered_widgets[0], rendered_widgets[1])
       
    def decompress(self, value):
        if value:
        	try:country, code = value
        	except:
        		country = None
        		code = value        	
        	if country in EMPTY_VALUES:
		    	try:empty, country, code = re.split('([a-zA-Z]+)', code)
		    	except:pass
	    	return [country, code]
        return [None, None]

class VatHiddenWidget(VatWidget):
    """
    A Widget that splits vat input into two <input type="hidden"> inputs.
    """
    def __init__(self, attrs=None):
        widgets = (HiddenInput(attrs=attrs), HiddenInput(attrs=attrs))
        super(VatWidget, self).__init__(widgets, attrs)

class VatField(forms.MultiValueField):
    """docstring for VatField"""
    hidden_widget = VatHiddenWidget
    def __init__(self, choices=VAT_CHOICES, *args, **kwargs):
        # Set 'required' to False on the individual fields, because the
        # required validation will be handled by MultiValueField, not by those
        # individual fields.
        fields = (
            forms.ChoiceField(required=True, choices=choices),
            forms.CharField(required=True),
        )
        for f in fields:
            f.required = False
        widget = VatWidget(choices=choices)
        super(VatField, self).__init__(widget=widget, fields=fields, *args, **kwargs)
    def compress(self, data_list):
    	if data_list:
    	 	return "".join(data_list)
    	return None