import copy
from urllib.parse import parse_qs

from django import forms
from django.contrib import admin
from django.db.models import F, Value as V
from django.db.models.functions import Concat
from django.utils.translation import ugettext_lazy as _

from orchestra.admin import ExtendedModelAdmin, ChangePasswordAdminMixin
from orchestra.admin.actions import disable
from orchestra.admin.utils import admin_link, change_url
from orchestra.contrib.accounts.admin import SelectAccountAdminMixin
from orchestra.contrib.accounts.filters import IsActiveListFilter

from . import settings
from .actions import SendMailboxEmail, SendAddressEmail
from .filters import HasMailboxListFilter, HasForwardListFilter, HasAddressListFilter
from .forms import MailboxCreationForm, MailboxChangeForm, AddressForm
from .models import Mailbox, Address, Autoresponse
from .widgets import OpenCustomFilteringOnSelect


class AutoresponseInline(admin.StackedInline):
    model = Autoresponse
    verbose_name_plural = _("autoresponse")
    
    def formfield_for_dbfield(self, db_field, **kwargs):
        if db_field.name == 'subject':
            kwargs['widget'] = forms.TextInput(attrs={'size':'118'})
        return super(AutoresponseInline, self).formfield_for_dbfield(db_field, **kwargs)


class MailboxAdmin(ChangePasswordAdminMixin, SelectAccountAdminMixin, ExtendedModelAdmin):
    list_display = (
        'name', 'account_link', 'display_filtering', 'display_addresses', 'display_active',
    )
    list_filter = (IsActiveListFilter, HasAddressListFilter, 'filtering')
    search_fields = ('account__username', 'account__short_name', 'account__full_name', 'name')
    add_fieldsets = (
        (None, {
            'fields': ('account_link', 'name', 'password1', 'password2', 'filtering'),
        }),
        (_("Custom filtering"), {
            'classes': ('collapse',),
            'fields': ('custom_filtering',),
        }),
        (_("Addresses"), {
            'fields': ('addresses',)
        }),
    )
    fieldsets = (
        (None, {
            'fields': ('name', 'password', 'is_active', 'account_link', 'filtering'),
        }),
        (_("Custom filtering"), {
            'classes': ('collapse',),
            'fields': ('custom_filtering',),
        }),
        (_("Addresses"), {
            'fields': ('addresses',)
        }),
    )
    readonly_fields = ('account_link', 'display_addresses')
    change_readonly_fields = ('name',)
    add_form = MailboxCreationForm
    form = MailboxChangeForm
    list_prefetch_related = ('addresses__domain',)
    actions = (disable,)
    
    def __init__(self, *args, **kwargs):
        super(MailboxAdmin, self).__init__(*args, **kwargs)
        if settings.MAILBOXES_LOCAL_ADDRESS_DOMAIN:
            type(self).actions = self.actions + (SendMailboxEmail(),)
    
    def display_addresses(self, mailbox):
        addresses = []
        for addr in mailbox.addresses.all():
            url = change_url(addr)
            addresses.append('<a href="%s">%s</a>' % (url, addr.email))
        return '<br>'.join(addresses)
    display_addresses.short_description = _("Addresses")
    display_addresses.allow_tags = True
    
    def display_filtering(self, mailbox):
        """ becacuse of allow_tags = True """
        return mailbox.get_filtering_display()
    display_filtering.short_description = _("Filtering")
    display_filtering.admin_order_field = 'filtering'
    display_filtering.allow_tags = True
    
    def formfield_for_dbfield(self, db_field, **kwargs):
        if db_field.name == 'filtering':
            kwargs['widget'] = OpenCustomFilteringOnSelect()
        return super(MailboxAdmin, self).formfield_for_dbfield(db_field, **kwargs)
    
    def get_fieldsets(self, request, obj=None):
        fieldsets = super(MailboxAdmin, self).get_fieldsets(request, obj)
        if obj and obj.filtering == obj.CUSTOM:
            # not collapsed filtering when exists
            fieldsets = copy.deepcopy(fieldsets)
            fieldsets[1][1]['classes'] = fieldsets[0][1]['fields'] + ('collapse', 'open',)
        elif '_to_field' in parse_qs(request.META['QUERY_STRING']):
            # remove address from popup
            fieldsets = list(copy.deepcopy(fieldsets))
            fieldsets.pop(-1)
        return fieldsets
    
    def get_form(self, *args, **kwargs):
        form = super(MailboxAdmin, self).get_form(*args, **kwargs)
        form.modeladmin = self
        return form
    
    def save_model(self, request, obj, form, change):
        """ save hacky mailbox.addresses """
        super(MailboxAdmin, self).save_model(request, obj, form, change)
        obj.addresses = form.cleaned_data['addresses']


class AddressAdmin(SelectAccountAdminMixin, ExtendedModelAdmin):
    list_display = (
        'display_email', 'account_link', 'domain_link', 'display_mailboxes', 'display_forward',
    )
    list_filter = (HasMailboxListFilter, HasForwardListFilter)
    fields = ('account_link', 'email_link', 'mailboxes', 'forward')
    add_fields = ('account_link', ('name', 'domain'), 'mailboxes', 'forward')
    inlines = [AutoresponseInline]
    search_fields = ('forward', 'mailboxes__name', 'account__username', 'computed_email')
    readonly_fields = ('account_link', 'domain_link', 'email_link')
    actions = (SendAddressEmail(),)
    filter_by_account_fields = ('domain', 'mailboxes')
    filter_horizontal = ['mailboxes']
    form = AddressForm
    list_prefetch_related = ('mailboxes', 'domain')
    
    domain_link = admin_link('domain', order='domain__name')
    
    def display_email(self, address):
        return address.computed_email
    display_email.short_description = _("Email")
    display_email.admin_order_field = 'computed_email'
    
    def email_link(self, address):
        link = self.domain_link(address)
        return "%s@%s" % (address.name, link)
    email_link.short_description = _("Email")
    email_link.allow_tags = True
    
    def display_mailboxes(self, address):
        boxes = []
        for mailbox in address.mailboxes.all():
            url = change_url(mailbox)
            boxes.append('<a href="%s">%s</a>' % (url, mailbox.name))
        return '<br>'.join(boxes)
    display_mailboxes.short_description = _("Mailboxes")
    display_mailboxes.allow_tags = True
    
    def display_forward(self, address):
        values = [ dest for dest in address.forward.split() ]
        return '<br>'.join(values)
    display_forward.short_description = _("Forward")
    display_forward.allow_tags = True
    display_forward.admin_order_field = 'forward'
    
    def formfield_for_dbfield(self, db_field, **kwargs):
        if db_field.name == 'forward':
            kwargs['widget'] = forms.TextInput(attrs={'size':'118'})
        return super(AddressAdmin, self).formfield_for_dbfield(db_field, **kwargs)
    
    def get_fields(self, request, obj=None):
        """ Remove mailboxes field when creating address from a popup i.e. from mailbox add form """
        fields = super(AddressAdmin, self).get_fields(request, obj)
        if '_to_field' in parse_qs(request.META['QUERY_STRING']):
            # Add address popup
            fields = list(fields)
            fields.remove('mailboxes')
        return fields
    
    def get_queryset(self, request):
        qs = super(AddressAdmin, self).get_queryset(request)
        return qs.annotate(computed_email=Concat(F('name'), V('@'), F('domain__name')))


admin.site.register(Mailbox, MailboxAdmin)
admin.site.register(Address, AddressAdmin)