from django.forms import *
from django.conf import settings as dj_settings
from django.utils import formats

from dojango.forms import widgets
from dojango.util import json_encode

__all__ = (
    'Field', 'DEFAULT_DATE_INPUT_FORMATS', 'DEFAULT_TIME_INPUT_FORMATS', # original django classes
    'DEFAULT_DATETIME_INPUT_FORMATS', 'MultiValueField', 'ComboField', # original django classes
    'DojoFieldMixin', 'CharField', 'ChoiceField', 'TypedChoiceField',
    'IntegerField', 'BooleanField', 'FileField', 'ImageField',
    'DateField', 'TimeField', 'DateTimeField', 'SplitDateTimeField',
    'RegexField', 'DecimalField', 'FloatField', 'FilePathField',
    'MultipleChoiceField', 'NullBooleanField', 'EmailField',
    'IPAddressField', 'URLField', 'SlugField',
)

class DojoFieldMixin(object):
    """
    A general mixin for all custom django/dojo form fields.
    It passes the field attributes in 'passed_attrs' to the form widget, so
    they can be used there. The widget itself then evaluates which of these
    fiels will be used.
    """
    passed_attrs = [ # forwarded field->widget attributes
        'required',
        'help_text',
        'min_value',
        'max_value',
        'max_length',
        'max_digits',
        'decimal_places',
        'js_regex', # special key for some dojo widgets
    ]
    
    def widget_attrs(self, widget):
        """Called, when the field is instanitating the widget. Here we collect
        all field attributes and pass it to the attributes of the widgets using
        the 'extra_field_attrs' key. These additional attributes will be
        evaluated by the widget and deleted within the 'DojoWidgetMixin'.
        """
        ret = {'extra_field_attrs': {}}
        for field_attr in self.passed_attrs:
            field_val = getattr(self, field_attr, None)
            #print field_attr, widget, field_val
            if field_val is not None:
                ret['extra_field_attrs'][field_attr] = field_val
        return ret

###############################################
# IMPLEMENTATION OF ALL EXISTING DJANGO FIELDS
###############################################

class CharField(DojoFieldMixin, fields.CharField):
    widget = widgets.ValidationTextInput

class ChoiceField(DojoFieldMixin, fields.ChoiceField):
    widget = widgets.Select
    
class TypedChoiceField(DojoFieldMixin, fields.TypedChoiceField):
    widget = widgets.Select

class IntegerField(DojoFieldMixin, fields.IntegerField):
    widget = widgets.NumberTextInput
    decimal_places = 0

class BooleanField(DojoFieldMixin, fields.BooleanField):
    widget = widgets.CheckboxInput

class FileField(DojoFieldMixin, fields.FileField):
    widget = widgets.FileInput
    
class ImageField(DojoFieldMixin, fields.ImageField):
    widget = widgets.FileInput

class DateField(DojoFieldMixin, fields.DateField):
    widget = widgets.DateInput
    
    def __init__(self, input_formats=None, min_value=None, max_value=None, *args, **kwargs):
        kwargs['input_formats'] = input_formats or \
            tuple(list(formats.get_format('DATE_INPUT_FORMATS')) + [
                '%Y-%m-%dT%H:%M', '%Y-%m-%dT%H:%M:%S' # also support dojo's default date-strings
            ])
        self.max_value = max_value
        self.min_value = min_value
        super(DateField, self).__init__(*args, **kwargs)

class TimeField(DojoFieldMixin, fields.TimeField):
    widget = widgets.TimeInput
    
    def __init__(self, input_formats=None, min_value=None, max_value=None, *args, **kwargs):
        kwargs['input_formats'] = input_formats or \
            tuple(list(formats.get_format('TIME_INPUT_FORMATS')) + [
                '%Y-%m-%dT%H:%M', '%Y-%m-%dT%H:%M:%S', 'T%H:%M:%S', 'T%H:%M' # also support dojo's default time-strings
            ])
        self.max_value = max_value
        self.min_value = min_value
        super(TimeField, self).__init__(*args, **kwargs)

class SplitDateTimeField(DojoFieldMixin, fields.SplitDateTimeField):
    widget = widgets.DateTimeInput
    
    def __init__(self, min_value=None, max_value=None, *args, **kwargs):
        self.max_value = max_value
        self.min_value = min_value
        super(SplitDateTimeField, self).__init__(*args, **kwargs)
        # Overwrite the SplitDateTimeField
        # copied from original SplitDateTimeField of django
        errors = self.default_error_messages.copy()
        if 'error_messages' in kwargs:
            errors.update(kwargs['error_messages'])
        fields = (
            DateField(error_messages={'invalid': errors['invalid_date']}),
            TimeField(error_messages={'invalid': errors['invalid_time']}),
        )
        # copied from original MultiValueField of django
        for f in fields:
            f.required = False
        self.fields = fields
    
DateTimeField = SplitDateTimeField # datetime-field is always splitted
    
class RegexField(DojoFieldMixin, fields.RegexField):
    widget = widgets.ValidationTextInput
    js_regex = None # we additionally have to define a custom javascript regexp, because the python one is not compatible to javascript
    
    def __init__(self, js_regex=None, *args, **kwargs):
        self.js_regex = js_regex
        super(RegexField, self).__init__(*args, **kwargs)
        
class DecimalField(DojoFieldMixin, fields.DecimalField):
    widget = widgets.NumberTextInput

class FloatField(DojoFieldMixin, fields.FloatField):
    widget = widgets.ValidationTextInput
    
class FilePathField(DojoFieldMixin, fields.FilePathField):
    widget = widgets.Select
    
class MultipleChoiceField(DojoFieldMixin, fields.MultipleChoiceField):
    widget = widgets.SelectMultiple
    
class NullBooleanField(DojoFieldMixin, fields.NullBooleanField):
    widget = widgets.NullBooleanSelect
    
class EmailField(DojoFieldMixin, fields.EmailField):
    widget = widgets.EmailTextInput
    
class IPAddressField(DojoFieldMixin, fields.IPAddressField):
    widget = widgets.IPAddressTextInput
    
class URLField(DojoFieldMixin, fields.URLField):
    widget = widgets.URLTextInput

class SlugField(DojoFieldMixin, fields.SlugField):
    widget = widgets.ValidationTextInput
    js_regex = '^[-\w]+$' # we cannot extract the original regex input from the python regex