from django import forms
from django.core.exceptions import ValidationError
from django.utils.safestring import mark_safe
from django.utils.translation import ugettext_lazy as _

from orchestra.apps import plugins
from orchestra.apps.plugins.forms import PluginDataForm
from orchestra.core import validators
from orchestra.forms import widgets
from orchestra.utils.functional import cached
from orchestra.utils.python import import_class

from .. import settings


class SoftwareServiceForm(PluginDataForm):
    password = forms.CharField(label=_("Password"), required=False,
            widget=widgets.ReadOnlyWidget('<strong>Unknown password</strong>'),
            help_text=_("Servide passwords are not stored, so there is no way to see this "
                        "service's password, but you can change the password using "
                        "<a href=\"password/\">this form</a>."))
    password1 = forms.CharField(label=_("Password"), validators=[validators.validate_password],
            widget=forms.PasswordInput)
    password2 = forms.CharField(label=_("Password confirmation"),
            widget=forms.PasswordInput,
            help_text=_("Enter the same password as above, for verification."))
    
    def __init__(self, *args, **kwargs):
        super(SoftwareServiceForm, self).__init__(*args, **kwargs)
        self.is_change = bool(self.instance and self.instance.pk)
        if self.is_change:
            for field in self.plugin.change_readonly_fileds + ('username',):
                value = getattr(self.instance, field, None) or self.instance.data[field]
                self.fields[field].required = False
                self.fields[field].widget = widgets.ReadOnlyWidget(value)
                self.fields[field].help_text = None
            
            site_name = self.instance.get_site_name()
            self.fields['password1'].required = False
            self.fields['password1'].widget = forms.HiddenInput()
            self.fields['password2'].required = False
            self.fields['password2'].widget = forms.HiddenInput()
        else:
            self.fields['password'].widget = forms.HiddenInput()
            site_name = self.plugin.site_name
        if site_name:
            link = '<a href="http://%s">%s</a>' % (site_name, site_name)
            self.fields['site_name'].widget = widgets.ReadOnlyWidget(site_name, mark_safe(link))
            self.fields['site_name'].required = False
        else:
            base_name = self.plugin.site_name_base_domain
            help_text = _("The final URL would be &lt;site_name&gt;.%s") % base_name
            self.fields['site_name'].help_text = help_text
    
    def clean_password2(self):
        if not self.is_change:
            password1 = self.cleaned_data.get("password1")
            password2 = self.cleaned_data.get("password2")
            if password1 and password2 and password1 != password2:
                msg = _("The two password fields didn't match.")
                raise forms.ValidationError(msg)
            return password2
    
    def clean_site_name(self):
        if self.plugin.site_name:
            return None
        return self.cleaned_data['site_name']
    
    def save(self, commit=True):
        obj = super(SoftwareServiceForm, self).save(commit=commit)
        if not self.is_change:
            obj.set_password(self.cleaned_data["password1"])
        return obj

class SoftwareService(plugins.Plugin):
    form = SoftwareServiceForm
    serializer = None
    site_name = None
    site_name_base_domain = 'orchestra.lan'
    icon = 'orchestra/icons/apps.png'
    change_readonly_fileds = ()
    class_verbose_name = _("Software as a Service")
    
    @classmethod
    @cached
    def get_plugins(cls):
        plugins = []
        for cls in settings.SAAS_ENABLED_SERVICES:
            plugins.append(import_class(cls))
        return plugins
    
    @classmethod
    def clean_data(cls, saas):
        """ model clean, uses cls.serizlier by default """
        serializer = cls.serializer(data=saas.data)
        if not serializer.is_valid():
            raise ValidationError(serializer.errors)
        return serializer.data
    
    def get_site_name(self, saas):
        return self.site_name or '.'.join((saas.site_name, self.site_name_base_domain))
    
    def get_form(self):
        self.form.plugin = self
        self.form.plugin_field = 'service'
        return self.form
    
    def get_serializer(self):
        self.serializer.plugin = self
        return self.serializer