import weakref
from datetime import datetime, timedelta
from itertools import chain

import pytz
from flask import request
from flask_wtf import FlaskForm as Form
from flask_wtf.file import FileAllowed
from flask_wtf.file import FileField as FileField_wtf
from notifications_utils.columns import Columns
from notifications_utils.formatters import strip_whitespace
from notifications_utils.recipients import (
    InvalidPhoneError,
    normalise_phone_number,
    validate_phone_number,
)
from wtforms import (
    BooleanField,
    DateField,
    FieldList,
    FileField,
    HiddenField,
    IntegerField,
    PasswordField,
    RadioField,
    SelectMultipleField,
    StringField,
    TextAreaField,
    ValidationError,
    validators,
    widgets,
)
from wtforms.fields.html5 import EmailField, SearchField, TelField
from wtforms.validators import URL, DataRequired, Length, Optional, Regexp
from wtforms.widgets import CheckboxInput, ListWidget

from app.main.validators import (
    Blacklist,
    CanonicalGovernmentDomain,
    CsvFileValidator,
    DoesNotStartWithDoubleZero,
    KnownGovernmentDomain,
    LettersNumbersAndFullStopsOnly,
    NoCommasInPlaceHolders,
    OnlyGSMCharacters,
    ValidEmail,
    ValidGovEmail,
)
from app.models.user import permissions, roles
from app.utils import AgreementInfo, guess_name_from_email_address


def get_time_value_and_label(future_time):
    return (
        future_time.replace(tzinfo=None).isoformat(),
        '{} at {}'.format(
            get_human_day(future_time.astimezone(pytz.timezone('Europe/London'))),
            get_human_time(future_time.astimezone(pytz.timezone('Europe/London')))
        )
    )


def get_human_time(time):
    return {
        '0': 'midnight',
        '12': 'midday'
    }.get(
        time.strftime('%-H'),
        time.strftime('%-I%p').lower()
    )


def get_human_day(time, prefix_today_with='T'):
    #  Add 1 hour to get ‘midnight today’ instead of ‘midnight tomorrow’
    time = (time - timedelta(hours=1)).strftime('%A')
    if time == datetime.utcnow().strftime('%A'):
        return '{}oday'.format(prefix_today_with)
    if time == (datetime.utcnow() + timedelta(days=1)).strftime('%A'):
        return 'Tomorrow'
    return time


def get_furthest_possible_scheduled_time():
    return (datetime.utcnow() + timedelta(days=4)).replace(hour=0)


def get_next_hours_until(until):
    now = datetime.utcnow()
    hours = int((until - now).total_seconds() / (60 * 60))
    return [
        (now + timedelta(hours=i)).replace(minute=0, second=0).replace(tzinfo=pytz.utc)
        for i in range(1, hours + 1)
    ]


def get_next_days_until(until):
    now = datetime.utcnow()
    days = int((until - now).total_seconds() / (60 * 60 * 24))
    return [
        get_human_day(
            (now + timedelta(days=i)).replace(tzinfo=pytz.utc),
            prefix_today_with='Later t'
        )
        for i in range(0, days + 1)
    ]


class MultiCheckboxField(SelectMultipleField):
    widget = ListWidget(prefix_label=False)
    option_widget = CheckboxInput()


def email_address(label='Email address', gov_user=True, required=True):

    validators = [
        ValidEmail(),
    ]

    if gov_user:
        validators.append(ValidGovEmail())

    if required:
        validators.append(DataRequired(message='Can’t be empty'))

    return EmailField(label, validators)


class UKMobileNumber(TelField):
    def pre_validate(self, form):
        try:
            validate_phone_number(self.data)
        except InvalidPhoneError as e:
            raise ValidationError(str(e))


class InternationalPhoneNumber(TelField):
    def pre_validate(self, form):
        try:
            if self.data:
                validate_phone_number(self.data, international=True)
        except InvalidPhoneError as e:
            raise ValidationError(str(e))


def uk_mobile_number(label='Mobile number'):
    return UKMobileNumber(label,
                          validators=[DataRequired(message='Can’t be empty')])


def international_phone_number(label='Mobile number'):
    return InternationalPhoneNumber(
        label,
        validators=[DataRequired(message='Can’t be empty')]
    )


def password(label='Password'):
    return PasswordField(label,
                         validators=[DataRequired(message='Can’t be empty'),
                                     Length(8, 255, message='Must be at least 8 characters'),
                                     Blacklist(message='Choose a password that’s harder to guess')])


class SMSCode(StringField):
    validators = [
        DataRequired(message='Can’t be empty'),
        Regexp(regex=r'^\d+$', message='Numbers only'),
        Length(min=5, message='Not enough numbers'),
        Length(max=5, message='Too many numbers'),
    ]

    def __call__(self, **kwargs):
        return super().__call__(type='tel', pattern='[0-9]*', **kwargs)


def organisation_type():
    return RadioField(
        'Who runs this service?',
        choices=[
            ('central', 'Central government'),
            ('local', 'Local government'),
            ('nhs', 'NHS'),
        ],
        validators=[DataRequired()],
    )


class StripWhitespaceForm(Form):
    class Meta:
        def bind_field(self, form, unbound_field, options):
            # FieldList simply doesn't support filters.
            # @see: https://github.com/wtforms/wtforms/issues/148
            no_filter_fields = (FieldList, PasswordField)
            filters = [strip_whitespace] if not issubclass(unbound_field.field_class, no_filter_fields) else []
            filters += unbound_field.kwargs.get('filters', [])
            bound = unbound_field.bind(form=form, filters=filters, **options)
            bound.get_form = weakref.ref(form)  # GC won't collect the form if we don't use a weakref
            return bound


class StripWhitespaceStringField(StringField):
    def __init__(self, label=None, **kwargs):
        kwargs['filters'] = tuple(chain(
            kwargs.get('filters', ()),
            (
                strip_whitespace,
            ),
        ))
        super(StringField, self).__init__(label, **kwargs)


class LoginForm(StripWhitespaceForm):
    email_address = EmailField('Email address', validators=[
        Length(min=5, max=255),
        DataRequired(message='Can’t be empty'),
        ValidEmail()
    ])
    password = PasswordField('Password', validators=[
        DataRequired(message='Enter your password')
    ])


class RegisterUserForm(StripWhitespaceForm):
    name = StringField('Full name',
                       validators=[DataRequired(message='Can’t be empty')])
    email_address = email_address()
    mobile_number = international_phone_number()
    password = password()
    # always register as sms type
    auth_type = HiddenField('auth_type', default='sms_auth')


class RegisterUserFromInviteForm(RegisterUserForm):
    def __init__(self, invited_user):
        super().__init__(
            service=invited_user['service'],
            email_address=invited_user['email_address'],
            auth_type=invited_user['auth_type'],
            name=guess_name_from_email_address(
                invited_user['email_address']
            ),
        )

    mobile_number = InternationalPhoneNumber('Mobile number', validators=[])
    service = HiddenField('service')
    email_address = HiddenField('email_address')
    auth_type = HiddenField('auth_type', validators=[DataRequired()])

    def validate_mobile_number(self, field):
        if self.auth_type.data == 'sms_auth' and not field.data:
            raise ValidationError('Can’t be empty')


class RegisterUserFromOrgInviteForm(StripWhitespaceForm):
    def __init__(self, invited_org_user):
        super().__init__(
            organisation=invited_org_user['organisation'],
            email_address=invited_org_user['email_address'],
        )

    name = StringField(
        'Full name',
        validators=[DataRequired(message='Can’t be empty')]
    )

    mobile_number = InternationalPhoneNumber('Mobile number', validators=[DataRequired(message='Can’t be empty')])
    password = password()
    organisation = HiddenField('organisation')
    email_address = HiddenField('email_address')
    auth_type = HiddenField('auth_type', validators=[DataRequired()])


PermissionsAbstract = type("PermissionsAbstract", (StripWhitespaceForm,), {
    permission: BooleanField(label) for permission, label in permissions
})


class PermissionsForm(PermissionsAbstract):

    login_authentication = RadioField(
        'Sign in using',
        choices=[
            ('sms_auth', 'Text message code'),
            ('email_auth', 'Email link'),
        ],
        validators=[DataRequired()]
    )

    @property
    def permissions(self):
        return {role for role in roles.keys() if self[role].data is True}

    @property
    def permissions_fields(self):
        return (getattr(self, permission) for permission, _ in permissions)

    @classmethod
    def from_user(cls, user, service_id):
        return cls(
            **{
                role: user.has_permission_for_service(service_id, role)
                for role in roles.keys()
            },
            login_authentication=user.auth_type
        )


class InviteUserForm(PermissionsForm):
    email_address = email_address(gov_user=False)

    def __init__(self, invalid_email_address, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.invalid_email_address = invalid_email_address.lower()

    def validate_email_address(self, field):
        if field.data.lower() == self.invalid_email_address:
            raise ValidationError("You can’t send an invitation to yourself")


class InviteOrgUserForm(StripWhitespaceForm):
    email_address = email_address(gov_user=False)

    def __init__(self, invalid_email_address, *args, **kwargs):
        super(InviteOrgUserForm, self).__init__(*args, **kwargs)
        self.invalid_email_address = invalid_email_address.lower()

    def validate_email_address(self, field):
        if field.data.lower() == self.invalid_email_address:
            raise ValidationError("You can’t send an invitation to yourself")


class TwoFactorForm(StripWhitespaceForm):
    def __init__(self, validate_code_func, *args, **kwargs):
        '''
        Keyword arguments:
        validate_code_func -- Validates the code with the API.
        '''
        self.validate_code_func = validate_code_func
        super(TwoFactorForm, self).__init__(*args, **kwargs)

    sms_code = SMSCode('Text message code')

    def validate(self):

        if not self.sms_code.validate(self):
            return False

        is_valid, reason = self.validate_code_func(self.sms_code.data)

        if not is_valid:
            self.sms_code.errors.append(reason)
            return False

        return True


class EmailNotReceivedForm(StripWhitespaceForm):
    email_address = email_address()


class TextNotReceivedForm(StripWhitespaceForm):
    mobile_number = international_phone_number()


class RenameServiceForm(StripWhitespaceForm):
    name = StringField(
        u'Service name',
        validators=[
            DataRequired(message='Can’t be empty')
        ])


class RenameOrganisationForm(StripWhitespaceForm):
    name = StringField(
        u'Organisation name',
        validators=[
            DataRequired(message='Can’t be empty')
        ])


class CreateServiceForm(StripWhitespaceForm):
    name = StringField(
        u'What’s your service called?',
        validators=[
            DataRequired(message='Can’t be empty')
        ])
    organisation_type = organisation_type()


class OrganisationTypeForm(StripWhitespaceForm):
    organisation_type = organisation_type()


class FreeSMSAllowance(StripWhitespaceForm):
    free_sms_allowance = IntegerField(
        'Numbers of text message fragments per year',
        validators=[
            DataRequired(message='Can’t be empty')
        ]
    )


class ConfirmPasswordForm(StripWhitespaceForm):
    def __init__(self, validate_password_func, *args, **kwargs):
        self.validate_password_func = validate_password_func
        super(ConfirmPasswordForm, self).__init__(*args, **kwargs)

    password = PasswordField(u'Enter password')

    def validate_password(self, field):
        if not self.validate_password_func(field.data):
            raise ValidationError('Invalid password')


class BaseTemplateForm(StripWhitespaceForm):
    name = StringField(
        u'Template name',
        validators=[DataRequired(message="Can’t be empty")])

    template_content = TextAreaField(
        u'Message',
        validators=[
            DataRequired(message="Can’t be empty"),
            NoCommasInPlaceHolders()
        ]
    )
    process_type = RadioField(
        'Use priority queue?',
        choices=[
            ('priority', 'Yes'),
            ('normal', 'No'),
        ],
        validators=[DataRequired()],
        default='normal'
    )


class SMSTemplateForm(BaseTemplateForm):
    def validate_template_content(self, field):
        OnlyGSMCharacters()(None, field)


class EmailTemplateForm(BaseTemplateForm):
    subject = TextAreaField(
        u'Subject',
        validators=[DataRequired(message="Can’t be empty")])


class LetterTemplateForm(EmailTemplateForm):
    subject = TextAreaField(
        u'Main heading',
        validators=[DataRequired(message="Can’t be empty")])

    template_content = TextAreaField(
        u'Body',
        validators=[
            DataRequired(message="Can’t be empty"),
            NoCommasInPlaceHolders()
        ]
    )


class LetterTemplatePostageForm(StripWhitespaceForm):
    postage = RadioField(
        'Choose the postage for this letter template',
        choices=[
            ('first', 'First class'),
            ('second', 'Second class'),
        ],
        validators=[DataRequired()]
    )


class ForgotPasswordForm(StripWhitespaceForm):
    email_address = email_address(gov_user=False)


class NewPasswordForm(StripWhitespaceForm):
    new_password = password()


class ChangePasswordForm(StripWhitespaceForm):
    def __init__(self, validate_password_func, *args, **kwargs):
        self.validate_password_func = validate_password_func
        super(ChangePasswordForm, self).__init__(*args, **kwargs)

    old_password = password('Current password')
    new_password = password('New password')

    def validate_old_password(self, field):
        if not self.validate_password_func(field.data):
            raise ValidationError('Invalid password')


class CsvUploadForm(StripWhitespaceForm):
    file = FileField('Add recipients', validators=[DataRequired(
        message='Please pick a file'), CsvFileValidator()])


class ChangeNameForm(StripWhitespaceForm):
    new_name = StringField(u'Your name')


class ChangeEmailForm(StripWhitespaceForm):
    def __init__(self, validate_email_func, *args, **kwargs):
        self.validate_email_func = validate_email_func
        super(ChangeEmailForm, self).__init__(*args, **kwargs)

    email_address = email_address()

    def validate_email_address(self, field):
        is_valid = self.validate_email_func(field.data)
        if is_valid:
            raise ValidationError("The email address is already in use")


class ChangeMobileNumberForm(StripWhitespaceForm):
    mobile_number = international_phone_number()


class ChooseTimeForm(StripWhitespaceForm):

    def __init__(self, *args, **kwargs):
        super(ChooseTimeForm, self).__init__(*args, **kwargs)
        self.scheduled_for.choices = [('', 'Now')] + [
            get_time_value_and_label(hour) for hour in get_next_hours_until(
                get_furthest_possible_scheduled_time()
            )
        ]
        self.scheduled_for.categories = get_next_days_until(get_furthest_possible_scheduled_time())

    scheduled_for = RadioField(
        'When should Notify send these messages?',
        default='',
        validators=[
            DataRequired()
        ]
    )


class CreateKeyForm(StripWhitespaceForm):
    def __init__(self, existing_keys, *args, **kwargs):
        self.existing_key_names = [
            key['name'].lower() for key in existing_keys
        ]
        super().__init__(*args, **kwargs)

    key_type = RadioField(
        'Type of key',
        validators=[
            DataRequired()
        ]
    )

    key_name = StringField(u'Description of key', validators=[
        DataRequired(message='You need to give the key a name')
    ])

    def validate_key_name(self, key_name):
        if key_name.data.lower() in self.existing_key_names:
            raise ValidationError('A key with this name already exists')


class SupportType(StripWhitespaceForm):
    support_type = RadioField(
        'How can we help you?',
        choices=[
            ('report-problem', 'Report a problem'),
            ('ask-question-give-feedback', 'Ask a question or give feedback'),
        ],
        validators=[DataRequired()]
    )


class Feedback(StripWhitespaceForm):
    name = StringField('Name')
    email_address = email_address(label='Email address', gov_user=False, required=False)
    feedback = TextAreaField('Your message', validators=[DataRequired(message="Can’t be empty")])


class Problem(Feedback):
    email_address = email_address(label='Email address', gov_user=False)


class Triage(StripWhitespaceForm):
    severe = RadioField(
        'Is it an emergency?',
        choices=[
            ('yes', 'Yes'),
            ('no', 'No'),
        ],
        validators=[DataRequired()]
    )


class RequestToGoLiveForm(StripWhitespaceForm):
    volume_email = StringField(
        'How many emails do you expect to send in the next year?',
        validators=[DataRequired(message='Can’t be empty')]
    )
    volume_sms = StringField(
        'How many text messages do you expect to send in the next year?',
        validators=[DataRequired(message='Can’t be empty')]
    )
    volume_letter = StringField(
        'How many letters do you expect to send in the next year?',
        validators=[DataRequired(message='Can’t be empty')]
    )
    research_consent = RadioField(
        'Can we contact you when we’re doing user research?',
        choices=[
            ('yes', 'Yes'),
            ('no', 'No'),
        ],
        validators=[DataRequired()]
    )


class ProviderForm(StripWhitespaceForm):
    priority = IntegerField('Priority', [validators.NumberRange(min=1, max=100, message="Must be between 1 and 100")])


class ServiceContactDetailsForm(StripWhitespaceForm):
    contact_details_type = RadioField(
        'Type of contact details',
        choices=[
            ('url', 'Link'),
            ('email_address', 'Email address'),
            ('phone_number', 'Phone number'),
        ],
        validators=[DataRequired()]
    )

    url = StringField("URL")
    email_address = EmailField("Email address")
    phone_number = StringField("Phone number")

    def validate(self):

        if self.contact_details_type.data == 'url':
            self.url.validators = [DataRequired(), URL(message='Must be a valid URL')]

        elif self.contact_details_type.data == 'email_address':
            self.email_address.validators = [DataRequired(), Length(min=5, max=255), ValidEmail()]

        elif self.contact_details_type.data == 'phone_number':
            # we can't use the existing phone number validation functions here since we want to allow landlines
            def valid_phone_number(self, num):
                try:
                    normalise_phone_number(num.data)
                    return True
                except InvalidPhoneError:
                    raise ValidationError('Must be a valid phone number')
            self.phone_number.validators = [DataRequired(), Length(min=5, max=20), valid_phone_number]

        return super().validate()


class ServiceReplyToEmailForm(StripWhitespaceForm):
    email_address = email_address(label='Email reply-to address', gov_user=False)
    is_default = BooleanField("Make this email address the default")


class ServiceSmsSenderForm(StripWhitespaceForm):
    sms_sender = StringField(
        'Text message sender',
        validators=[
            DataRequired(message="Can’t be empty"),
            Length(max=11, message="Enter 11 characters or fewer"),
            Length(min=4, message="Enter 4 characters or more"),
            LettersNumbersAndFullStopsOnly(),
            DoesNotStartWithDoubleZero(),
        ]
    )
    is_default = BooleanField("Make this text message sender the default")


class ServiceEditInboundNumberForm(StripWhitespaceForm):
    is_default = BooleanField("Make this text message sender the default")


class ServiceLetterContactBlockForm(StripWhitespaceForm):
    letter_contact_block = TextAreaField(
        validators=[
            DataRequired(message="Can’t be empty"),
            NoCommasInPlaceHolders()
        ]
    )
    is_default = BooleanField("Set as your default address")

    def validate_letter_contact_block(self, field):
        line_count = field.data.strip().count('\n')
        if line_count >= 10:
            raise ValidationError(
                'Contains {} lines, maximum is 10'.format(line_count + 1)
            )


class ServiceSwitchChannelForm(StripWhitespaceForm):

    def __init__(self, channel, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.enabled.label.text = 'Send {}'.format({
            'email': 'emails',
            'sms': 'text messages',
            'letter': 'letters',
        }.get(channel))

    enabled = RadioField(
        'Choices',
        choices=[
            ('on', 'On'),
            ('off', 'Off'),
        ],
    )


class FieldWithNoneOption():

    # This is a special value that is specific to our forms. This is
    # more expicit than casting `None` to a string `'None'` which can
    # have unexpected edge cases
    NONE_OPTION_VALUE = '__NONE__'

    # When receiving Python data, eg when instantiating the form object
    # we want to convert that data to our special value, so that it gets
    # recognised as being one of the valid choices
    def process_data(self, value):
        self.data = self.NONE_OPTION_VALUE if value is None else value

    # After validation we want to convert it back to a Python `None` for
    # use elsewhere, eg posting to the API
    def post_validate(self, form, validation_stopped):
        if self.data == self.NONE_OPTION_VALUE and not validation_stopped:
            self.data = None


class RadioFieldWithNoneOption(FieldWithNoneOption, RadioField):
    pass


class NestedRadioField(RadioFieldWithNoneOption):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

    def children(self):
        # start map with root option as a single child entry
        child_map = {None: [option for option in self
                            if option.data == self.NONE_OPTION_VALUE]}

        # add entries for all other children
        for option in self:
            if option.data == self.NONE_OPTION_VALUE:
                child_ids = [
                    folder['id'] for folder in self.all_template_folders
                    if folder['parent_id'] is None]
                key = self.NONE_OPTION_VALUE
            else:
                child_ids = [
                    folder['id'] for folder in self.all_template_folders
                    if folder['parent_id'] == option.data]
                key = option.data

            child_map[key] = [option for option in self if option.data in child_ids]

        return child_map


class HiddenFieldWithNoneOption(FieldWithNoneOption, HiddenField):
    pass


class RadioFieldWithRequiredMessage(RadioField):
    def __init__(self, *args, required_message='Not a valid choice', **kwargs):
        self.required_message = required_message
        super().__init__(*args, **kwargs)

    def pre_validate(self, form):
        try:
            return super().pre_validate(form)
        except ValueError:
            raise ValueError(self.required_message)


class ServiceSetEmailBranding(StripWhitespaceForm):

    branding_style = RadioFieldWithNoneOption(
        'Branding style',
        validators=[
            DataRequired()
        ]
    )

    DEFAULT = (FieldWithNoneOption.NONE_OPTION_VALUE, 'GOV.UK')

    def __init__(self, all_branding_options, current_branding):

        super().__init__(branding_style=current_branding)

        self.branding_style.choices = sorted(
            all_branding_options + [self.DEFAULT],
            key=lambda branding: (
                branding[0] != current_branding,
                branding[0] is not self.DEFAULT[0],
                branding[1].lower(),
            ),
        )


class ServiceSetLetterBranding(ServiceSetEmailBranding):
    # form is the same, but instead of GOV.UK we have None as a valid option
    DEFAULT = (FieldWithNoneOption.NONE_OPTION_VALUE, 'None')


class ServicePreviewBranding(StripWhitespaceForm):

    branding_style = HiddenFieldWithNoneOption('branding_style')


class GovernmentDomainField(StringField):
    validators = [
        KnownGovernmentDomain(),
        CanonicalGovernmentDomain(),
    ]

    def post_validate(self, form, validation_stopped):
        if self.data == '':
            self.data = None
        if self.data and not self.errors:
            self.data = AgreementInfo(self.data).canonical_domain


class ServiceUpdateEmailBranding(StripWhitespaceForm):
    name = StringField('Name of brand')
    text = StringField('Text')
    domain = GovernmentDomainField('Domain')
    colour = StringField(
        'Colour',
        validators=[
            Regexp(regex="^$|^#(?:[0-9a-fA-F]{3}){1,2}$", message='Must be a valid color hex code (starting with #)')
        ]
    )
    file = FileField_wtf('Upload a PNG logo', validators=[FileAllowed(['png'], 'PNG Images only!')])
    brand_type = RadioField(
        "Brand type",
        choices=[
            ('both', 'GOV.UK and branding'),
            ('org', 'Branding only'),
            ('org_banner', 'Branding banner'),
        ]
    )

    def validate_name(form, name):
        op = request.form.get('operation')
        if op == 'email-branding-details' and not form.name.data:
            raise ValidationError('This field is required')


class SVGFileUpload(StripWhitespaceForm):
    file = FileField_wtf(
        'Upload an SVG logo',
        validators=[
            FileAllowed(['svg'], 'SVG Images only!'),
            DataRequired(message="You need to upload a file to submit")
        ]
    )


class ServiceLetterBrandingDetails(StripWhitespaceForm):
    name = StringField('Name of brand', validators=[DataRequired()])
    domain = GovernmentDomainField('Domain')


class PDFUploadForm(StripWhitespaceForm):
    file = FileField_wtf(
        'Upload a letter in PDF format to check if it fits in the printable area',
        validators=[
            FileAllowed(['pdf'], 'PDF documents only!'),
            DataRequired(message="You need to upload a file to submit")
        ]
    )


class CreateOrUpdateOrganisation(StripWhitespaceForm):

    name = StringField('Name', validators=[DataRequired()])


class EmailFieldInWhitelist(EmailField, StripWhitespaceStringField):
    pass


class InternationalPhoneNumberInWhitelist(InternationalPhoneNumber, StripWhitespaceStringField):
    pass


class Whitelist(StripWhitespaceForm):

    def populate(self, email_addresses, phone_numbers):
        for form_field, existing_whitelist in (
            (self.email_addresses, email_addresses),
            (self.phone_numbers, phone_numbers)
        ):
            for index, value in enumerate(existing_whitelist):
                form_field[index].data = value

    email_addresses = FieldList(
        EmailFieldInWhitelist(
            '',
            validators=[
                Optional(),
                ValidEmail()
            ],
            default=''
        ),
        min_entries=5,
        max_entries=5,
        label="Email addresses"
    )

    phone_numbers = FieldList(
        InternationalPhoneNumberInWhitelist(
            '',
            validators=[
                Optional()
            ],
            default=''
        ),
        min_entries=5,
        max_entries=5,
        label="Mobile numbers"
    )


class DateFilterForm(StripWhitespaceForm):
    start_date = DateField("Start Date", [validators.optional()])
    end_date = DateField("End Date", [validators.optional()])
    include_from_test_key = BooleanField("Include test keys", default="checked", false_values={"N"})


class SearchByNameForm(StripWhitespaceForm):

    search = SearchField('Search by name')


class SearchUsersByEmailForm(StripWhitespaceForm):

    search = SearchField(
        'Search by name or email address',
        validators=[
            DataRequired("You need to enter full or partial email address to search by.")
        ],
    )


class SearchUsersForm(StripWhitespaceForm):

    search = SearchField('Search by name or email address')


class SearchNotificationsForm(StripWhitespaceForm):

    to = SearchField()

    labels = {
        'email': 'Search by email address',
        'sms': 'Search by phone number',
    }

    def __init__(self, message_type, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.to.label.text = self.labels.get(
            message_type,
            'Search by phone number or email address',
        )


class PlaceholderForm(StripWhitespaceForm):

    pass


class PasswordFieldShowHasContent(StringField):
    widget = widgets.PasswordInput(hide_value=False)


class ServiceInboundNumberForm(StripWhitespaceForm):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.inbound_number.choices = kwargs['inbound_number_choices']

    inbound_number = RadioField(
        "Select your inbound number",
        validators=[
            DataRequired("Option must be selected")
        ]
    )


class CallbackForm(StripWhitespaceForm):

    def validate(self):
        return super().validate() or self.url.data == ''


class ServiceReceiveMessagesCallbackForm(CallbackForm):
    url = StringField(
        "URL",
        validators=[DataRequired(message='Can’t be empty'),
                    Regexp(regex="^https.*", message='Must be a valid https URL')]
    )
    bearer_token = PasswordFieldShowHasContent(
        "Bearer token",
        validators=[DataRequired(message='Can’t be empty'),
                    Length(min=10, message='Must be at least 10 characters')]
    )


class ServiceDeliveryStatusCallbackForm(CallbackForm):
    url = StringField(
        "URL",
        validators=[DataRequired(message='Can’t be empty'),
                    Regexp(regex="^https.*", message='Must be a valid https URL')]
    )
    bearer_token = PasswordFieldShowHasContent(
        "Bearer token",
        validators=[DataRequired(message='Can’t be empty'),
                    Length(min=10, message='Must be at least 10 characters')]
    )


class InternationalSMSForm(StripWhitespaceForm):
    enabled = RadioField(
        'Send text messages to international phone numbers',
        choices=[
            ('on', 'On'),
            ('off', 'Off'),
        ],
    )


class SMSPrefixForm(StripWhitespaceForm):
    enabled = RadioField(
        '',
        choices=[
            ('on', 'On'),
            ('off', 'Off'),
        ],
    )


def get_placeholder_form_instance(
    placeholder_name,
    dict_to_populate_from,
    template_type,
    optional_placeholder=False,
    allow_international_phone_numbers=False,
):

    if (
        Columns.make_key(placeholder_name) == 'emailaddress' and
        template_type == 'email'
    ):
        field = email_address(label=placeholder_name, gov_user=False)
    elif (
        Columns.make_key(placeholder_name) == 'phonenumber' and
        template_type == 'sms'
    ):
        if allow_international_phone_numbers:
            field = international_phone_number(label=placeholder_name)
        else:
            field = uk_mobile_number(label=placeholder_name)
    elif optional_placeholder:
        field = StringField(placeholder_name)
    else:
        field = StringField(placeholder_name, validators=[
            DataRequired(message='Can’t be empty')
        ])

    PlaceholderForm.placeholder_value = field

    return PlaceholderForm(
        placeholder_value=dict_to_populate_from.get(placeholder_name, '')
    )


class SetSenderForm(StripWhitespaceForm):

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.sender.choices = kwargs['sender_choices']
        self.sender.label.text = kwargs['sender_label']

    sender = RadioField()


class SetTemplateSenderForm(StripWhitespaceForm):

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.sender.choices = kwargs['sender_choices']
        self.sender.label.text = 'Select your sender'

    sender = RadioField()


class LinkOrganisationsForm(StripWhitespaceForm):

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.organisations.choices = kwargs['choices']

    organisations = RadioField(
        'Select an organisation',
        validators=[
            DataRequired()
        ]
    )


branding_options = (
    ('govuk', 'GOV.UK only'),
    ('both', 'GOV.UK and logo'),
    ('org', 'Your logo'),
    ('org_banner', 'Your logo on a colour'),
)
branding_options_dict = dict(branding_options)


class BrandingOptionsEmail(StripWhitespaceForm):

    options = RadioField(
        'Branding options',
        choices=branding_options,
        validators=[
            DataRequired()
        ],
    )


class ServiceDataRetentionForm(StripWhitespaceForm):

    notification_type = RadioField(
        'What notification type?',
        choices=[
            ('email', 'Email'),
            ('sms', 'SMS'),
            ('letter', 'Letter'),
        ],
        validators=[DataRequired()],
    )
    days_of_retention = IntegerField(label="Days of retention",
                                     validators=[validators.NumberRange(min=3, max=90,
                                                                        message="Must be between 3 and 90")],
                                     )


class ServiceDataRetentionEditForm(StripWhitespaceForm):
    days_of_retention = IntegerField(label="Days of retention",
                                     validators=[validators.NumberRange(min=3, max=90,
                                                                        message="Must be between 3 and 90")],
                                     )


class ReturnedLettersForm(StripWhitespaceForm):
    references = TextAreaField(
        u'Letter references',
        validators=[
            DataRequired(message="Can’t be empty"),
        ]
    )


class TemplateFolderForm(StripWhitespaceForm):
    name = StringField('Folder name', validators=[DataRequired(message='Can’t be empty')])


def required_for_ops(*operations):
    operations = set(operations)

    def validate(form, field):
        if form.op not in operations and any(field.raw_data):
            # super weird
            raise validators.StopValidation('Must be empty')
        if form.op in operations and not any(field.raw_data):
            raise validators.StopValidation('Can’t be empty')
    return validate


class TemplateAndFoldersSelectionForm(Form):
    """
    This form expects the form data to include an operation, based on which submit button is clicked.
    If enter is pressed, unknown will be sent by a hidden submit button at the top of the form.
    The value of this operation affects which fields are required, expected to be empty, or optional.

    * unknown
        currently not implemented, but in the future will try and work out if there are any obvious commands that can be
        assumed based on which fields are empty vs populated.
    * move-to-existing-folder
        must have data for templates_and_folders checkboxes, and move_to radios
    * move-to-new-folder
        must have data for move_to_new_folder_name, cannot have data for move_to_existing_folder_name
    * add-new-folder
        must have data for move_to_existing_folder_name, cannot have data for move_to_new_folder_name
    """

    ALL_TEMPLATES_FOLDER = {
        'name': 'Templates',
        'id': RadioFieldWithNoneOption.NONE_OPTION_VALUE,
    }

    def __init__(
        self,
        all_template_folders,
        template_list,
        allow_adding_letter_template,
        allow_adding_copy_of_template,
        *args,
        **kwargs
    ):

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

        self.templates_and_folders.choices = template_list.as_id_and_name

        self.op = None
        self.is_move_op = self.is_add_folder_op = self.is_add_template_op = False

        self.move_to.all_template_folders = all_template_folders
        self.move_to.choices = [
            (item['id'], item['name'])
            for item in ([self.ALL_TEMPLATES_FOLDER] + all_template_folders)
        ]

        self.add_template_by_template_type.choices = list(filter(None, [
            ('email', 'Email template'),
            ('sms', 'Text message template'),
            ('letter', 'Letter template') if allow_adding_letter_template else None,
            ('copy-existing', 'Copy of an existing template') if allow_adding_copy_of_template else None,
        ]))

    def is_selected(self, template_folder_id):
        return template_folder_id in (self.templates_and_folders.data or [])

    def validate(self):
        self.op = request.form.get('operation')

        self.is_move_op = self.op in {'move-to-existing-folder', 'move-to-new-folder'}
        self.is_add_folder_op = self.op in {'add-new-folder', 'move-to-new-folder'}
        self.is_add_template_op = self.op in {'add-new-template'}

        if not (self.is_add_folder_op or self.is_move_op or self.is_add_template_op):
            return False

        return super().validate()

    def get_folder_name(self):
        if self.op == 'add-new-folder':
            return self.add_new_folder_name.data
        elif self.op == 'move-to-new-folder':
            return self.move_to_new_folder_name.data
        return None

    templates_and_folders = MultiCheckboxField('Choose templates or folders', validators=[
        required_for_ops('move-to-new-folder', 'move-to-existing-folder')
    ])
    # if no default set, it is set to None, which process_data transforms to '__NONE__'
    # this means '__NONE__' (self.ALL_TEMPLATES option) is selected when no form data has been submitted
    # set default to empty string so process_data method doesn't perform any transformation
    move_to = NestedRadioField(
        'Choose a folder',
        default='',
        validators=[
            required_for_ops('move-to-existing-folder'),
            Optional()
        ])
    add_new_folder_name = StringField('Folder name', validators=[required_for_ops('add-new-folder')])
    move_to_new_folder_name = StringField('Folder name', validators=[required_for_ops('move-to-new-folder')])

    add_template_by_template_type = RadioFieldWithRequiredMessage('Add new', validators=[
        required_for_ops('add-new-template'),
        Optional(),
    ], required_message='Select the type of template you want to add')