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

from app import current_service, service_api_client
from app.event_handlers import (
    create_email_change_event,
    create_mobile_number_change_event,
    create_remove_user_from_service_event,
)
from app.main import main
from app.main.forms import (
    BroadcastInviteUserForm,
    BroadcastPermissionsForm,
    ChangeEmailForm,
    ChangeMobileNumberForm,
    ChangeNonGovEmailForm,
    InviteUserForm,
    PermissionsForm,
    SearchUsersForm,
)
from app.models.roles_and_permissions import broadcast_permissions, permissions
from app.models.user import InvitedUser, User
from app.utils import is_gov_user, redact_mobile_number, user_has_permissions


@main.route("/services/<uuid:service_id>/users")
@user_has_permissions(allow_org_user=True)
def manage_users(service_id):
    return render_template(
        'views/manage-users.html',
        users=current_service.team_members,
        current_user=current_user,
        show_search_box=(len(current_service.team_members) > 7),
        form=SearchUsersForm(),
        permissions=(
            broadcast_permissions if current_service.has_permission('broadcast') else permissions
        ),
    )


@main.route("/services/<uuid:service_id>/users/invite", methods=['GET', 'POST'])
@user_has_permissions('manage_service')
def invite_user(service_id):

    if current_service.has_permission('broadcast'):
        form_class = BroadcastInviteUserForm
    else:
        form_class = InviteUserForm

    form = form_class(
        invalid_email_address=current_user.email_address,
        all_template_folders=current_service.all_template_folders,
        folder_permissions=[f['id'] for f in current_service.all_template_folders]
    )

    service_has_email_auth = current_service.has_permission('email_auth')
    if not service_has_email_auth:
        form.login_authentication.data = 'sms_auth'

    if form.validate_on_submit():
        email_address = form.email_address.data
        invited_user = InvitedUser.create(
            current_user.id,
            service_id,
            email_address,
            form.permissions,
            form.login_authentication.data,
            form.folder_permissions.data,
        )

        flash('Invite sent to {}'.format(invited_user.email_address), 'default_with_tick')
        return redirect(url_for('.manage_users', service_id=service_id))

    return render_template(
        'views/invite-user.html',
        form=form,
        service_has_email_auth=service_has_email_auth,
        mobile_number=True,
    )


@main.route("/services/<uuid:service_id>/users/<uuid:user_id>", methods=['GET', 'POST'])
@user_has_permissions('manage_service')
def edit_user_permissions(service_id, user_id):
    service_has_email_auth = current_service.has_permission('email_auth')
    user = current_service.get_team_member(user_id)

    mobile_number = None
    if user.mobile_number:
        mobile_number = redact_mobile_number(user.mobile_number, " ")

    if current_service.has_permission('broadcast'):
        form_class = BroadcastPermissionsForm
    else:
        form_class = PermissionsForm

    form = form_class.from_user(
        user,
        service_id,
        folder_permissions=None if user.platform_admin else [
            f['id'] for f in current_service.all_template_folders
            if user.has_template_folder_permission(f)
        ],
        all_template_folders=None if user.platform_admin else current_service.all_template_folders
    )

    if form.validate_on_submit():
        user.set_permissions(
            service_id,
            permissions=form.permissions,
            folder_permissions=form.folder_permissions.data,
        )
        if service_has_email_auth:
            user.update(auth_type=form.login_authentication.data)
        return redirect(url_for('.manage_users', service_id=service_id))

    return render_template(
        'views/edit-user-permissions.html',
        user=user,
        form=form,
        service_has_email_auth=service_has_email_auth,
        mobile_number=mobile_number,
        delete=request.args.get('delete'),
    )


@main.route("/services/<uuid:service_id>/users/<uuid:user_id>/delete", methods=['POST'])
@user_has_permissions('manage_service')
def remove_user_from_service(service_id, user_id):
    try:
        service_api_client.remove_user_from_service(service_id, user_id)
    except HTTPError as e:
        msg = "You cannot remove the only user for a service"
        if e.status_code == 400 and msg in e.message:
            flash(msg, 'info')
            return redirect(url_for(
                '.manage_users',
                service_id=service_id))
        else:
            abort(500, e)
    else:
        create_remove_user_from_service_event(user_id=user_id, removed_by_id=current_user.id, service_id=service_id)

    return redirect(url_for(
        '.manage_users',
        service_id=service_id
    ))


@main.route("/services/<uuid:service_id>/users/<uuid:user_id>/edit-email", methods=['GET', 'POST'])
@user_has_permissions('manage_service')
def edit_user_email(service_id, user_id):
    user = current_service.get_team_member(user_id)
    user_email = user.email_address
    session_key = 'team_member_email_change-{}'.format(user_id)

    if is_gov_user(user_email):
        form = ChangeEmailForm(User.already_registered, email_address=user_email)
    else:
        form = ChangeNonGovEmailForm(User.already_registered, email_address=user_email)

    if request.form.get('email_address', '').strip() == user_email:
        return redirect(url_for('.manage_users', service_id=current_service.id))

    if form.validate_on_submit():
        session[session_key] = form.email_address.data

        return redirect(url_for('.confirm_edit_user_email', user_id=user.id, service_id=service_id))

    return render_template(
        'views/manage-users/edit-user-email.html',
        user=user,
        form=form,
        service_id=service_id
    )


@main.route("/services/<uuid:service_id>/users/<uuid:user_id>/edit-email/confirm", methods=['GET', 'POST'])
@user_has_permissions('manage_service')
def confirm_edit_user_email(service_id, user_id):
    user = current_service.get_team_member(user_id)
    session_key = 'team_member_email_change-{}'.format(user_id)
    if session_key in session:
        new_email = session[session_key]
    else:
        return redirect(url_for(
            '.edit_user_email',
            service_id=service_id,
            user_id=user_id
        ))
    if request.method == 'POST':
        try:
            user.update(email_address=new_email, updated_by=current_user.id)
        except HTTPError as e:
            abort(500, e)
        else:
            create_email_change_event(user.id, current_user.id, user.email_address, new_email)
        finally:
            session.pop(session_key, None)

        return redirect(url_for(
            '.manage_users',
            service_id=service_id
        ))
    return render_template(
        'views/manage-users/confirm-edit-user-email.html',
        user=user,
        service_id=service_id,
        new_email=new_email
    )


@main.route("/services/<uuid:service_id>/users/<uuid:user_id>/edit-mobile-number", methods=['GET', 'POST'])
@user_has_permissions('manage_service')
def edit_user_mobile_number(service_id, user_id):
    user = current_service.get_team_member(user_id)
    user_mobile_number = redact_mobile_number(user.mobile_number)

    form = ChangeMobileNumberForm(mobile_number=user_mobile_number)
    if form.mobile_number.data == user_mobile_number and request.method == 'POST':
        return redirect(url_for(
            '.manage_users',
            service_id=service_id
        ))
    if form.validate_on_submit():
        session['team_member_mobile_change'] = form.mobile_number.data

        return redirect(url_for('.confirm_edit_user_mobile_number', user_id=user.id, service_id=service_id))
    return render_template(
        'views/manage-users/edit-user-mobile.html',
        user=user,
        form=form,
        service_id=service_id
    )


@main.route("/services/<uuid:service_id>/users/<uuid:user_id>/edit-mobile-number/confirm", methods=['GET', 'POST'])
@user_has_permissions('manage_service')
def confirm_edit_user_mobile_number(service_id, user_id):
    user = current_service.get_team_member(user_id)
    if 'team_member_mobile_change' in session:
        new_number = session['team_member_mobile_change']
    else:
        return redirect(url_for(
            '.edit_user_mobile_number',
            service_id=service_id,
            user_id=user_id
        ))
    if request.method == 'POST':
        try:
            user.update(mobile_number=new_number, updated_by=current_user.id)
        except HTTPError as e:
            abort(500, e)
        else:
            create_mobile_number_change_event(user.id, current_user.id, user.mobile_number, new_number)
        finally:
            session.pop('team_member_mobile_change', None)

        return redirect(url_for(
            '.manage_users',
            service_id=service_id
        ))

    return render_template(
        'views/manage-users/confirm-edit-user-mobile-number.html',
        user=user,
        service_id=service_id,
        new_mobile_number=new_number
    )


@main.route("/services/<uuid:service_id>/cancel-invited-user/<uuid:invited_user_id>", methods=['GET'])
@user_has_permissions('manage_service')
def cancel_invited_user(service_id, invited_user_id):
    current_service.cancel_invite(invited_user_id)

    invited_user = InvitedUser.by_id_and_service_id(service_id, invited_user_id)

    flash(f'Invitation cancelled for {invited_user.email_address}', 'default_with_tick')
    return redirect(url_for('main.manage_users', service_id=service_id))