import json

from flask import (
    abort,
    current_app,
    flash,
    redirect,
    render_template,
    request,
    session,
    url_for,
)
from flask_login import current_user
from notifications_python_client.errors import HTTPError
from notifications_utils.url_safe_token import check_token

from app import user_api_client
from app.main import main
from app.main.forms import (
    ChangeEmailForm,
    ChangeMobileNumberForm,
    ChangeNameForm,
    ChangePasswordForm,
    ChangeSecurityKeyNameForm,
    ConfirmPasswordForm,
    ServiceOnOffSettingForm,
    TwoFactorForm,
)
from app.models.user import User
from app.utils.user import user_is_gov_user, user_is_logged_in

NEW_EMAIL = 'new-email'
NEW_MOBILE = 'new-mob'
NEW_MOBILE_PASSWORD_CONFIRMED = 'new-mob-password-confirmed'


@main.route("/user-profile")
@user_is_logged_in
def user_profile():
    return render_template(
        'views/user-profile.html',
        can_see_edit=current_user.is_gov_user,
    )


@main.route("/user-profile/name", methods=['GET', 'POST'])
@user_is_logged_in
def user_profile_name():

    form = ChangeNameForm(new_name=current_user.name)

    if form.validate_on_submit():
        current_user.update(name=form.new_name.data)
        return redirect(url_for('.user_profile'))

    return render_template(
        'views/user-profile/change.html',
        thing='name',
        form_field=form.new_name
    )


@main.route("/user-profile/email", methods=['GET', 'POST'])
@user_is_logged_in
@user_is_gov_user
def user_profile_email():

    form = ChangeEmailForm(User.already_registered,
                           email_address=current_user.email_address)

    if form.validate_on_submit():
        session[NEW_EMAIL] = form.email_address.data
        return redirect(url_for('.user_profile_email_authenticate'))
    return render_template(
        'views/user-profile/change.html',
        thing='email address',
        form_field=form.email_address
    )


@main.route("/user-profile/email/authenticate", methods=['GET', 'POST'])
@user_is_logged_in
def user_profile_email_authenticate():
    # Validate password for form
    def _check_password(pwd):
        return user_api_client.verify_password(current_user.id, pwd)
    form = ConfirmPasswordForm(_check_password)

    if NEW_EMAIL not in session:
        return redirect('main.user_profile_email')

    if form.validate_on_submit():
        user_api_client.send_change_email_verification(current_user.id, session[NEW_EMAIL])
        return render_template('views/change-email-continue.html',
                               new_email=session[NEW_EMAIL])

    return render_template(
        'views/user-profile/authenticate.html',
        thing='email address',
        form=form,
        back_link=url_for('.user_profile_email')
    )


@main.route("/user-profile/email/confirm/<token>", methods=['GET'])
@user_is_logged_in
def user_profile_email_confirm(token):
    token_data = check_token(token,
                             current_app.config['SECRET_KEY'],
                             current_app.config['DANGEROUS_SALT'],
                             current_app.config['EMAIL_EXPIRY_SECONDS'])
    token_data = json.loads(token_data)
    user = User.from_id(token_data['user_id'])
    user.update(email_address=token_data['email'])
    session.pop(NEW_EMAIL, None)

    return redirect(url_for('.user_profile'))


@main.route("/user-profile/mobile-number", methods=['GET', 'POST'])
@main.route(
    "/user-profile/mobile-number/delete",
    methods=['GET'],
    endpoint="user_profile_confirm_delete_mobile_number"
)
@user_is_logged_in
def user_profile_mobile_number():

    user = User.from_id(current_user.id)
    form = ChangeMobileNumberForm(mobile_number=current_user.mobile_number)

    if form.validate_on_submit():
        session[NEW_MOBILE] = form.mobile_number.data
        return redirect(url_for('.user_profile_mobile_number_authenticate'))

    if (request.endpoint == "main.user_profile_confirm_delete_mobile_number"):
        flash("Are you sure you want to delete your mobile number from Notify?", 'delete')

    return render_template(
        'views/user-profile/change.html',
        thing='mobile number',
        form_field=form.mobile_number,
        user_auth=user.auth_type
    )


@main.route("/user-profile/mobile-number/delete", methods=['POST'])
@user_is_logged_in
def user_profile_mobile_number_delete():
    if current_user.auth_type != 'email_auth':
        abort(403)

    current_user.update(mobile_number=None)

    return redirect(url_for('.user_profile'))


@main.route("/user-profile/mobile-number/authenticate", methods=['GET', 'POST'])
@user_is_logged_in
def user_profile_mobile_number_authenticate():

    # Validate password for form
    def _check_password(pwd):
        return user_api_client.verify_password(current_user.id, pwd)
    form = ConfirmPasswordForm(_check_password)

    if NEW_MOBILE not in session:
        return redirect(url_for('.user_profile_mobile_number'))

    if form.validate_on_submit():
        session[NEW_MOBILE_PASSWORD_CONFIRMED] = True
        current_user.send_verify_code(to=session[NEW_MOBILE])
        return redirect(url_for('.user_profile_mobile_number_confirm'))

    return render_template(
        'views/user-profile/authenticate.html',
        thing='mobile number',
        form=form,
        back_link=url_for('.user_profile_mobile_number_confirm')
    )


@main.route("/user-profile/mobile-number/confirm", methods=['GET', 'POST'])
@user_is_logged_in
def user_profile_mobile_number_confirm():

    # Validate verify code for form
    def _check_code(cde):
        return user_api_client.check_verify_code(current_user.id, cde, 'sms')

    if NEW_MOBILE_PASSWORD_CONFIRMED not in session:
        return redirect(url_for('.user_profile_mobile_number'))

    form = TwoFactorForm(_check_code)

    if form.validate_on_submit():
        current_user.refresh_session_id()
        mobile_number = session[NEW_MOBILE]
        del session[NEW_MOBILE]
        del session[NEW_MOBILE_PASSWORD_CONFIRMED]
        current_user.update(mobile_number=mobile_number)
        return redirect(url_for('.user_profile'))

    return render_template(
        'views/user-profile/confirm.html',
        form_field=form.sms_code,
        thing='mobile number'
    )


@main.route("/user-profile/password", methods=['GET', 'POST'])
@user_is_logged_in
def user_profile_password():

    # Validate password for form
    def _check_password(pwd):
        return user_api_client.verify_password(current_user.id, pwd)
    form = ChangePasswordForm(_check_password)

    if form.validate_on_submit():
        user_api_client.update_password(current_user.id, password=form.new_password.data)
        return redirect(url_for('.user_profile'))

    return render_template(
        'views/user-profile/change-password.html',
        form=form
    )


@main.route("/user-profile/disable-platform-admin-view", methods=['GET', 'POST'])
@user_is_logged_in
def user_profile_disable_platform_admin_view():
    if not current_user.platform_admin and not session.get('disable_platform_admin_view'):
        abort(403)

    form = ServiceOnOffSettingForm(
        name="Use platform admin view",
        enabled=not session.get('disable_platform_admin_view'),
        truthy='Yes',
        falsey='No',
    )

    form.enabled.param_extensions = {"hint": {"text": "Signing in again clears this setting"}}

    if form.validate_on_submit():
        session['disable_platform_admin_view'] = not form.enabled.data
        return redirect(url_for('.user_profile'))

    return render_template(
        'views/user-profile/disable-platform-admin-view.html',
        form=form
    )


@main.route("/user-profile/security-keys", methods=['GET'])
@user_is_logged_in
def user_profile_security_keys():
    if not current_user.can_use_webauthn:
        abort(403)

    return render_template(
        'views/user-profile/security-keys.html',
    )


@main.route(
    "/user-profile/security-keys/<uuid:key_id>/manage",
    methods=['GET', 'POST'],
    endpoint="user_profile_manage_security_key"
)
@main.route(
    "/user-profile/security-keys/<uuid:key_id>/delete",
    methods=['GET'],
    endpoint="user_profile_confirm_delete_security_key"
)
@user_is_logged_in
def user_profile_manage_security_key(key_id):
    if not current_user.can_use_webauthn:
        abort(403)

    security_key = current_user.webauthn_credentials.by_id(key_id)

    if not security_key:
        abort(404)

    form = ChangeSecurityKeyNameForm(security_key_name=security_key.name)

    if form.validate_on_submit():
        if form.security_key_name.data != security_key.name:
            user_api_client.update_webauthn_credential_name_for_user(
                user_id=current_user.id,
                credential_id=key_id,
                new_name_for_credential=form.security_key_name.data
            )
        return redirect(url_for('.user_profile_security_keys'))

    if (request.endpoint == "main.user_profile_confirm_delete_security_key"):
        flash("Are you sure you want to delete this security key?", 'delete')

    return render_template(
        'views/user-profile/manage-security-key.html',
        security_key=security_key,
        form=form
    )


@main.route("/user-profile/security-keys/<uuid:key_id>/delete", methods=['POST'])
@user_is_logged_in
def user_profile_delete_security_key(key_id):
    if not current_user.can_use_webauthn:
        abort(403)

    try:
        user_api_client.delete_webauthn_credential_for_user(
            user_id=current_user.id,
            credential_id=key_id
        )
    except HTTPError as e:
        message = "Cannot delete last remaining webauthn credential for user"
        if e.message == message:
            flash("You cannot delete your last security key.")
            return redirect(url_for('.user_profile_manage_security_key', key_id=key_id))
        else:
            raise e

    return redirect(url_for('.user_profile_security_keys'))