from django import forms
from django.db.models import Q
from django.contrib.auth import get_user_model
from django.contrib.auth.password_validation import validate_password
from django.utils.translation import gettext_lazy as _
from django.utils.translation import ngettext

from misago.acl.models import Role
from misago.admin.forms import IsoDateTimeField, YesNoSwitch
from misago.conf import settings
from misago.core import threadstore
from misago.core.validators import validate_sluggable

from misago.users.models import Ban, DataDownload, Rank
from misago.users.profilefields import profilefields
from misago.users.utils import hash_email
from misago.users.validators import validate_email, validate_username

UserModel = get_user_model()


class UserBaseForm(forms.ModelForm):
    username = forms.CharField(label=_("Username"))
    title = forms.CharField(label=_("Custom title"), required=False)
    email = forms.EmailField(label=_("E-mail address"))

    class Meta:
        model = UserModel
        fields = ['username', 'email', 'title']

    def clean_username(self):
        data = self.cleaned_data['username']
        validate_username(data, exclude=self.instance)
        return data

    def clean_email(self):
        data = self.cleaned_data['email']
        validate_email(data, exclude=self.instance)
        return data

    def clean_new_password(self):
        data = self.cleaned_data['new_password']
        if data:
            validate_password(data, user=self.instance)
        return data

    def clean_roles(self):
        data = self.cleaned_data['roles']

        for role in data:
            if role.special_role == 'authenticated':
                break
        else:
            message = _('All registered members must have "Member" role.')
            raise forms.ValidationError(message)

        return data


class NewUserForm(UserBaseForm):
    new_password = forms.CharField(
        label=_("Password"),
        strip=False,
        widget=forms.PasswordInput,
    )

    class Meta:
        model = UserModel
        fields = ['username', 'email', 'title']


class EditUserForm(UserBaseForm):
    IS_STAFF_LABEL = _("Is administrator")
    IS_STAFF_HELP_TEXT = _(
        "Designates whether the user can log into admin sites. "
        "If Django admin site is enabled, this user will need "
        "additional permissions assigned within it to admin "
        "Django modules."
    )

    IS_SUPERUSER_LABEL = _("Is superuser")
    IS_SUPERUSER_HELP_TEXT = _(
        "Only administrators can access admin sites. "
        "In addition to admin site access, superadmins "
        "can also change other members admin levels."
    )

    IS_ACTIVE_LABEL = _('Is active')
    IS_ACTIVE_HELP_TEXT = _(
        "Designates whether this user should be treated as active. "
        "Turning this off is non-destructible way to remove user accounts."
    )

    IS_ACTIVE_STAFF_MESSAGE_LABEL = _("Staff message")
    IS_ACTIVE_STAFF_MESSAGE_HELP_TEXT = _(
        "Optional message for forum team members explaining "
        "why user's account has been disabled."
    )

    new_password = forms.CharField(
        label=_("Change password to"),
        strip=False,
        widget=forms.PasswordInput,
        required=False,
    )

    is_avatar_locked = YesNoSwitch(
        label=_("Lock avatar"),
        help_text=_(
            "Setting this to yes will stop user from changing "
            "his/her avatar, and will reset his/her avatar to "
            "procedurally generated one."
        )
    )
    avatar_lock_user_message = forms.CharField(
        label=_("User message"),
        help_text=_(
            "Optional message for user explaining "
            "why he/she is banned form changing avatar."
        ),
        widget=forms.Textarea(attrs={'rows': 3}),
        required=False
    )
    avatar_lock_staff_message = forms.CharField(
        label=_("Staff message"),
        help_text=_(
            "Optional message for forum team members explaining "
            "why user is banned form changing avatar."
        ),
        widget=forms.Textarea(attrs={'rows': 3}),
        required=False
    )

    signature = forms.CharField(
        label=_("Signature contents"),
        widget=forms.Textarea(attrs={'rows': 3}),
        required=False,
    )
    is_signature_locked = YesNoSwitch(
        label=_("Lock signature"),
        help_text=_(
            "Setting this to yes will stop user from "
            "making changes to his/her signature."
        )
    )
    signature_lock_user_message = forms.CharField(
        label=_("User message"),
        help_text=_("Optional message to user explaining why his/hers signature is locked."),
        widget=forms.Textarea(attrs={'rows': 3}),
        required=False
    )
    signature_lock_staff_message = forms.CharField(
        label=_("Staff message"),
        help_text=_("Optional message to team members explaining why user signature is locked."),
        widget=forms.Textarea(attrs={'rows': 3}),
        required=False
    )

    is_hiding_presence = YesNoSwitch(label=_("Hides presence"))

    limits_private_thread_invites_to = forms.TypedChoiceField(
        label=_("Who can add user to private threads"),
        coerce=int,
        choices=UserModel.LIMIT_INVITES_TO_CHOICES
    )

    subscribe_to_started_threads = forms.TypedChoiceField(
        label=_("Started threads"), coerce=int, choices=UserModel.SUBSCRIPTION_CHOICES
    )
    subscribe_to_replied_threads = forms.TypedChoiceField(
        label=_("Replid threads"), coerce=int, choices=UserModel.SUBSCRIPTION_CHOICES
    )

    class Meta:
        model = UserModel
        fields = [
            'username',
            'email',
            'title',
            'is_avatar_locked',
            'avatar_lock_user_message',
            'avatar_lock_staff_message',
            'signature',
            'is_signature_locked',
            'is_hiding_presence',
            'limits_private_thread_invites_to',
            'signature_lock_user_message',
            'signature_lock_staff_message',
            'subscribe_to_started_threads',
            'subscribe_to_replied_threads',
        ]

    def __init__(self, *args, **kwargs):
        self.request = kwargs.pop('request')

        super().__init__(*args, **kwargs)

        profilefields.add_fields_to_admin_form(self.request, self.instance, self)

    def get_profile_fields_groups(self):
        profile_fields_groups = []
        for group in self._profile_fields_groups:
            fields_group = {
                'name': group['name'],
                'fields': [],
            }

            for fieldname in group['fields']:
                fields_group['fields'].append(self[fieldname])

            profile_fields_groups.append(fields_group)
        return profile_fields_groups

    def clean_signature(self):
        data = self.cleaned_data['signature']

        length_limit = settings.signature_length_max
        if len(data) > length_limit:
            raise forms.ValidationError(
                ngettext(
                    "Signature can't be longer than %(limit)s character.",
                    "Signature can't be longer than %(limit)s characters.",
                    length_limit,
                ) % {'limit': length_limit}
            )

        return data

    def clean(self):
        data = super().clean()
        return profilefields.clean_form(self.request, self.instance, self, data)


def UserFormFactory(FormType, instance):
    extra_fields = {}

    extra_fields['rank'] = forms.ModelChoiceField(
        label=_("Rank"),
        help_text=_(
            "Ranks are used to group and distinguish users. They are "
            "also used to add permissions to groups of users."
        ),
        queryset=Rank.objects.order_by('name'),
        initial=instance.rank
    )

    roles = Role.objects.order_by('name')

    extra_fields['roles'] = forms.ModelMultipleChoiceField(
        label=_("Roles"),
        help_text=_('Individual roles of this user. All users must have "member" role.'),
        queryset=roles,
        initial=instance.roles.all() if instance.pk else None,
        widget=forms.CheckboxSelectMultiple
    )

    return type('UserFormFinal', (FormType, ), extra_fields)


def StaffFlagUserFormFactory(FormType, instance):
    staff_fields = {
        'is_staff': YesNoSwitch(
            label=EditUserForm.IS_STAFF_LABEL,
            help_text=EditUserForm.IS_STAFF_HELP_TEXT,
            initial=instance.is_staff
        ),
        'is_superuser': YesNoSwitch(
            label=EditUserForm.IS_SUPERUSER_LABEL,
            help_text=EditUserForm.IS_SUPERUSER_HELP_TEXT,
            initial=instance.is_superuser
        ),
    }

    return type('StaffUserForm', (FormType, ), staff_fields)


def UserIsActiveFormFactory(FormType, instance):
    is_active_fields = {
        'is_active': YesNoSwitch(
            label=EditUserForm.IS_ACTIVE_LABEL,
            help_text=EditUserForm.IS_ACTIVE_HELP_TEXT,
            initial=instance.is_active
        ),
        'is_active_staff_message': forms.CharField(
            label=EditUserForm.IS_ACTIVE_STAFF_MESSAGE_LABEL,
            help_text=EditUserForm.IS_ACTIVE_STAFF_MESSAGE_HELP_TEXT,
            initial=instance.is_active_staff_message,
            widget=forms.Textarea(attrs={'rows': 3}),
            required=False
        ),
    }

    return type('UserIsActiveForm', (FormType, ), is_active_fields)


def EditUserFormFactory(FormType, instance, add_is_active_fields=False, add_admin_fields=False):
    FormType = UserFormFactory(FormType, instance)

    if add_is_active_fields:
        FormType = UserIsActiveFormFactory(FormType, instance)

    if add_admin_fields:
        FormType = StaffFlagUserFormFactory(FormType, instance)

    return FormType


class SearchUsersFormBase(forms.Form):
    username = forms.CharField(label=_("Username starts with"), required=False)
    email = forms.CharField(label=_("E-mail starts with"), required=False)
    profilefields = forms.CharField(label=_("Profile fields contain"), required=False)
    inactive = YesNoSwitch(label=_("Inactive only"))
    disabled = YesNoSwitch(label=_("Disabled only"))
    is_staff = YesNoSwitch(label=_("Admins only"))
    is_deleting_account = YesNoSwitch(label=_("Deleting their accounts"))

    def filter_queryset(self, criteria, queryset):
        if criteria.get('username'):
            queryset = queryset.filter(slug__startswith=criteria.get('username').lower())

        if criteria.get('email'):
            queryset = queryset.filter(email__istartswith=criteria.get('email'))

        if criteria.get('rank'):
            queryset = queryset.filter(rank_id=criteria.get('rank'))

        if criteria.get('role'):
            queryset = queryset.filter(roles__id=criteria.get('role'))

        if criteria.get('inactive'):
            queryset = queryset.filter(requires_activation__gt=0)

        if criteria.get('disabled'):
            queryset = queryset.filter(is_active=False)

        if criteria.get('is_staff'):
            queryset = queryset.filter(is_staff=True)

        if criteria.get('is_deleting_account'):
            queryset = queryset.filter(is_deleting_account=True)

        if criteria.get('profilefields', '').strip():
            queryset = profilefields.search_users(
                criteria.get('profilefields').strip(), queryset)

        return queryset


def SearchUsersForm(*args, **kwargs):
    """
    Factory that uses cache for ranks and roles,
    and makes those ranks and roles typed choice fields that play nice
    with passing values via GET
    """
    ranks_choices = threadstore.get('misago_admin_ranks_choices', 'nada')
    if ranks_choices == 'nada':
        ranks_choices = [('', _("All ranks"))]
        for rank in Rank.objects.order_by('name').iterator():
            ranks_choices.append((rank.pk, rank.name))
        threadstore.set('misago_admin_ranks_choices', ranks_choices)

    roles_choices = threadstore.get('misago_admin_roles_choices', 'nada')
    if roles_choices == 'nada':
        roles_choices = [('', _("All roles"))]
        for role in Role.objects.order_by('name').iterator():
            roles_choices.append((role.pk, role.name))
        threadstore.set('misago_admin_roles_choices', roles_choices)

    extra_fields = {
        'rank': forms.TypedChoiceField(
            label=_("Has rank"),
            coerce=int,
            required=False,
            choices=ranks_choices,
        ),
        'role': forms.TypedChoiceField(
            label=_("Has role"),
            coerce=int,
            required=False,
            choices=roles_choices,
        )
    }

    FinalForm = type('SearchUsersFormFinal', (SearchUsersFormBase, ), extra_fields)
    return FinalForm(*args, **kwargs)


class RankForm(forms.ModelForm):
    name = forms.CharField(
        label=_("Name"),
        validators=[validate_sluggable()],
        help_text=_(
            'Short and descriptive name of all users with this rank. '
            '"The Team" or "Game Masters" are good examples.'
        )
    )
    title = forms.CharField(
        label=_("User title"),
        required=False,
        help_text=_(
            'Optional, singular version of rank name displayed by user names. '
            'For example "GM" or "Dev".'
        )
    )
    description = forms.CharField(
        label=_("Description"),
        max_length=2048,
        required=False,
        widget=forms.Textarea(attrs={'rows': 3}),
        help_text=_(
            "Optional description explaining function or status of "
            "members distincted with this rank."
        )
    )
    roles = forms.ModelMultipleChoiceField(
        label=_("User roles"),
        widget=forms.CheckboxSelectMultiple,
        queryset=Role.objects.order_by('name'),
        required=False,
        help_text=_("Rank can give additional roles to users with it.")
    )
    css_class = forms.CharField(
        label=_("CSS class"),
        required=False,
        help_text=_("Optional css class added to content belonging to this rank owner.")
    )
    is_tab = forms.BooleanField(
        label=_("Give rank dedicated tab on users list"),
        required=False,
        help_text=_(
            "Selecting this option will make users with this rank easily discoverable "
            "by others through dedicated page on forum users list."
        )
    )

    class Meta:
        model = Rank
        fields = [
            'name',
            'description',
            'css_class',
            'title',
            'roles',
            'is_tab',
        ]

    def clean_name(self):
        data = self.cleaned_data['name']
        self.instance.set_name(data)

        unique_qs = Rank.objects.filter(slug=self.instance.slug)
        if self.instance.pk:
            unique_qs = unique_qs.exclude(pk=self.instance.pk)

        if unique_qs.exists():
            raise forms.ValidationError(_("This name collides with other rank."))

        return data


class BanUsersForm(forms.Form):
    ban_type = forms.MultipleChoiceField(
        label=_("Values to ban"),
        widget=forms.CheckboxSelectMultiple,
        choices=[]
    )
    user_message = forms.CharField(
        label=_("User message"),
        required=False,
        max_length=1000,
        help_text=_("Optional message displayed to users instead of default one."),
        widget=forms.Textarea(attrs={'rows': 3}),
        error_messages={
            'max_length': _("Message can't be longer than 1000 characters."),
        }
    )
    staff_message = forms.CharField(
        label=_("Team message"),
        required=False,
        max_length=1000,
        help_text=_("Optional ban message for moderators and administrators."),
        widget=forms.Textarea(attrs={'rows': 3}),
        error_messages={
            'max_length': _("Message can't be longer than 1000 characters."),
        }
    )
    expires_on = IsoDateTimeField(
        label=_("Expires on"),
        required=False,
        help_text=_("Leave this field empty for set bans to never expire.")
    )

    def __init__(self, *args, **kwargs):
        users = kwargs.pop('users')

        super().__init__(*args, **kwargs)

        self.fields['ban_type'].choices = [
            ('usernames', _('Usernames')),
            ('emails', _('E-mails')),
            ('domains', _('E-mail domains')),
        ]

        enable_ip_bans = list(filter(None, [u.joined_from_ip for u in users]))
        if enable_ip_bans:
            self.fields['ban_type'].choices += [
                ('ip', _('IP addresses')),
                ('ip_first', _('First segment of IP addresses')),
                ('ip_two', _('First two segments of IP addresses')),
            ]


class BanForm(forms.ModelForm):
    check_type = forms.TypedChoiceField(
        label=_("Check type"),
        coerce=int,
        choices=Ban.CHOICES,
    )
    registration_only = YesNoSwitch(
        label=_("Restrict this ban to registrations"),
        help_text=_(
            "Changing this to yes will make this ban check be only performed on registration "
            "step. This is good if you want to block certain registrations like ones from "
            "recently comprimised e-mail providers, without harming existing users."
        ),
    )
    banned_value = forms.CharField(
        label=_("Banned value"),
        max_length=250,
        help_text=_(
            'This value is case-insensitive and accepts asterisk (*) '
            'for rought matches. For example, making IP ban for value '
            '"83.*" will ban all IP addresses beginning with "83.".'
        ),
        error_messages={
            'max_length': _("Banned value can't be longer than 250 characters."),
        }
    )
    user_message = forms.CharField(
        label=_("User message"),
        required=False,
        max_length=1000,
        help_text=_("Optional message displayed to user instead of default one."),
        widget=forms.Textarea(attrs={'rows': 3}),
        error_messages={
            'max_length': _("Message can't be longer than 1000 characters."),
        }
    )
    staff_message = forms.CharField(
        label=_("Team message"),
        required=False,
        max_length=1000,
        help_text=_("Optional ban message for moderators and administrators."),
        widget=forms.Textarea(attrs={'rows': 3}),
        error_messages={
            'max_length': _("Message can't be longer than 1000 characters."),
        }
    )
    expires_on = IsoDateTimeField(
        label=_("Expires on"),
        required=False,
        help_text=_("Leave this field empty for this ban to never expire.")
    )

    class Meta:
        model = Ban
        fields = [
            'check_type',
            'registration_only',
            'banned_value',
            'user_message',
            'staff_message',
            'expires_on',
        ]

    def clean_banned_value(self):
        data = self.cleaned_data['banned_value']
        while '**' in data:
            data = data.replace('**', '*')

        if data == '*':
            raise forms.ValidationError(_("Banned value is too vague."))

        return data


class SearchBansForm(forms.Form):
    check_type = forms.ChoiceField(
        label=_("Type"),
        required=False,
        choices=[
            ('', _('All bans')),
            ('names', _('Usernames')),
            ('emails', _('E-mails')),
            ('ips', _('IPs')),
        ],
    )
    value = forms.CharField(label=_("Banned value begins with"), required=False)
    registration_only = forms.ChoiceField(
        label=_("Registration only"),
        required=False,
        choices=[
            ('', _('Any')),
            ('only', _('Yes')),
            ('exclude', _('No')),
        ]
    )
    state = forms.ChoiceField(
        label=_("State"),
        required=False,
        choices=[
            ('', _('Any')),
            ('used', _('Active')),
            ('unused', _('Expired')),
        ]
    )

    def filter_queryset(self, search_criteria, queryset):
        criteria = search_criteria
        if criteria.get('check_type') == 'names':
            queryset = queryset.filter(check_type=0)

        if criteria.get('check_type') == 'emails':
            queryset = queryset.filter(check_type=1)

        if criteria.get('check_type') == 'ips':
            queryset = queryset.filter(check_type=2)

        if criteria.get('value'):
            queryset = queryset.filter(banned_value__startswith=criteria.get('value').lower())

        if criteria.get('state') == 'used':
            queryset = queryset.filter(is_checked=True)

        if criteria.get('state') == 'unused':
            queryset = queryset.filter(is_checked=False)

        if criteria.get('registration_only') == 'only':
            queryset = queryset.filter(registration_only=True)

        if criteria.get('registration_only') == 'exclude':
            queryset = queryset.filter(registration_only=False)

        return queryset


class RequestDataDownloadsForm(forms.Form):
    user_identifiers = forms.CharField(
        label=_("Usernames or emails"),
        help_text=_(
            "Enter every item in new line. Duplicates will be ignored. "
            "This field is case insensitive. Depending on site configuration and amount of data "
            "to archive it may take up to few days for requests to complete. E-mail "
            "will notification will be sent to every user once their download is ready."
        ),
        widget=forms.Textarea,
    )

    def clean_user_identifiers(self):
        user_identifiers = self.cleaned_data['user_identifiers'].lower().splitlines()
        user_identifiers = list(filter(bool, user_identifiers))
        user_identifiers = list(set(user_identifiers))
        
        if len(user_identifiers) > 20:
            raise forms.ValidationError(
                _(
                    "You may not enter more than 20 items at single time "
                    "(You have entered %(show_value)s)."
                ) % {'show_value': len(user_identifiers)}
            )
        
        return user_identifiers

    def clean(self):
        data = super().clean()

        if data.get('user_identifiers'):
            username_match = Q(slug__in=data['user_identifiers'])
            email_match = Q(email_hash__in=map(hash_email, data['user_identifiers']))

            data['users'] = list(UserModel.objects.filter(username_match | email_match))

            if len(data['users']) != len(data['user_identifiers']):
                raise forms.ValidationError(_("One or more specified users could not be found."))

        return data


class SearchDataDownloadsForm(forms.Form):
    status = forms.ChoiceField(
        label=_("Status"),
        required=False,
        choices=DataDownload.STATUS_CHOICES,
    )
    user = forms.CharField(
        label=_("User"),
        required=False,
    )
    requested_by = forms.CharField(
        label=_("Requested by"),
        required=False,
    )

    def filter_queryset(self, search_criteria, queryset):
        criteria = search_criteria
        if criteria.get('status') is not None:
            queryset = queryset.filter(status=criteria['status'])

        if criteria.get('user'):
            queryset = queryset.filter(user__slug__istartswith=criteria['user'])

        if criteria.get('requested_by'):
            queryset = queryset.filter(requester__slug__istartswith=criteria['requested_by'])

        return queryset