from .models import UserModel, UserProfileModel
from django import forms
from django.contrib import admin
from django.contrib.auth.models import Group
from django.contrib.auth.admin import UserAdmin as BaseUserAdmin
from django.contrib.auth.forms import ReadOnlyPasswordHashField

class UserCreationForm(forms.ModelForm):
    password = forms.CharField(label='Password',widget=forms.PasswordInput)
    passwordrepeat = forms.CharField(label='Confirm Password',widget=forms.PasswordInput)
    class Meta:
        model = UserModel
        fields = ('email',)
    def clean_password(self):
        # Check that the two password entries match
        password = self.cleaned_data.get('password')
        passwordrepeat = self.cleaned_data.get('passwordrepeat')
        if password and passwordrepeat and password != passwordrepeat:
            raise forms.ValidationError("Passwords do not match")
        return passwordrepeat
    def save(self, commit=True):
        # Save the provided password in hashed format
        user = super(UserCreationForm, self).save(commit=False)
        user.set_password(self.clean_password['password'])
        if commit:
            user.save()
        return user

class UserUpdateForm(forms.ModelForm):
    password = ReadOnlyPasswordHashField()
    class Meta:
        model = UserModel
        fields = ('email','password','is_active','is_admin')
    def clean_password(self):
        # Regardless of what the user provides, return the initial value.
        # This is done here, rather than on the field, because the
        # field does not have access to the initial value
        return self.initial['password']

class UserProfileInline(admin.StackedInline):
    model = UserProfileModel
    fields = ('user_fname','user_lname','user_type',)
    can_delete = False
    verbose_name_plural = 'Profile'
    fk_name = 'user'

class UserAdmin(BaseUserAdmin):
    # The forms to add and change user instances
    update_form = UserUpdateForm
    create_form = UserCreationForm
    # The fields to be used in displaying UserModel.
    # These override the definitions on the base UserAdmin
    # that reference specific fields on auth.User.
    list_display = ('email','dt_joined','dt_updated','is_active','is_admin')
    list_filter = ('is_admin','dt_joined','dt_updated','is_active')
    fieldsets = (
        (None, {'fields': ('email','password',)}),
        ('Permissions', {'fields':('is_admin','is_active')}),
    )
    inlines = (UserProfileInline, )
    # add_fieldsets is not a standard ModelAdmin attribute. UserAdmin
    # overrides get_fieldsets to use this attribute when creating a user.
    add_fieldsets = (
        (None, {
            'classes':('wide',),
            'fields':('email','password','is_admin','is_superadmin','is_active')
        }
        ),
    )
    search_fields = ('email',)
    ordering = ('email',)
    filter_horizontal = ()
    def get_inline_instances(self, request, obj=None):
        if not obj:
            return list()
        return super(UserAdmin, self).get_inline_instances(request, obj)

admin.site.register(UserModel, UserAdmin)
admin.site.unregister(Group)

# User Manager and User Model
class UserManager(BaseUserManager):
    class Meta:
        verbose_name = 'Manager'
    def create_user(self,email,password=None):
        if not email:
            raise ValueError('Users must have an email address')
        user = self.model(email=self.normalize_email(email))
        user.set_password(password)
        user.save(using=self._db)
        return user
    def create_adminuser(self,email,password):
        user = self.create_user(email,password=password)
        user.is_admin = True
        user.is_superadmin = False
        user.save(using=self._db)
        return user
    def create_superuser(self,email,password):
        user = self.create_user(email,password=password)
        user.is_admin = True
        user.is_superadmin = True
        user.save(using=self._db)
        return user

class UserModel(AbstractBaseUser): # For the Company Employees
    id=models.AutoField(primary_key=True) # Have set this explicitly for clarity purposes
    email=models.EmailField(max_length=255,unique=True,verbose_name='Email Address')
    dt_joined=models.DateTimeField(auto_now_add=True,verbose_name='Date Joined')
    dt_updated=models.DateTimeField(auto_now=True,verbose_name='Date Updated')
    is_active=models.BooleanField(default=True)
    is_admin=models.BooleanField(default=False)
    is_superadmin=models.BooleanField(default=False)
    objects=UserManager()
    USERNAME_FIELD='email'
    REQUIRED_FIELDS=[]
    class Meta:
        verbose_name = 'User'
    def __unicode__(self):
        return self.email
    def __str__(self):
        return self.email
    def get_short_name(self):
        return self.email
    def has_perm(self,perm,obj=None):
        return True
    def has_module_perms(self,app_label):
        return True
    def email_user(self,subject,message,from_email=None,**kwargs):
        send_mail(subject, message, from_email, [self.email], **kwargs)
    @property
    def is_staff(self):
        return self.is_admin