from flask import abort, flash, redirect, render_template, session, url_for
from flask_login import current_user
from markupsafe import Markup

from app.main import main
from app.models.organisation import Organisation
from app.models.service import Service
from app.models.user import (
    InvitedOrgUser,
    InvitedUser,
    OrganisationUsers,
    User,
    Users,
)


@main.route("/invitation/<token>")
def accept_invite(token):
    invited_user = InvitedUser.from_token(token)

    if not current_user.is_anonymous and current_user.email_address.lower() != invited_user.email_address.lower():
        message = Markup("""
            You’re signed in as {}.
            This invite is for another email address.
            <a href={} class="govuk-link govuk-link--no-visited-state">Sign out</a>
            and click the link again to accept this invite.
            """.format(
            current_user.email_address,
            url_for("main.sign_out")))

        flash(message=message)

        abort(403)

    if invited_user.status == 'cancelled':
        service = Service.from_id(invited_user.service)
        return render_template('views/cancelled-invitation.html',
                               from_user=invited_user.from_user.name,
                               service_name=service.name)
    if invited_user.status == 'accepted':
        session.pop('invited_user_id', None)
        service = Service.from_id(invited_user.service)
        return redirect(url_for('main.service_dashboard', service_id=invited_user.service))

    session['invited_user_id'] = invited_user.id

    existing_user = User.from_email_address_or_none(invited_user.email_address)

    if existing_user:
        existing_user.update_email_access_validated_at()
        invited_user.accept_invite()
        if existing_user in Users(invited_user.service):
            return redirect(url_for('main.service_dashboard', service_id=invited_user.service))
        else:
            service = Service.from_id(invited_user.service)
            # if the service you're being added to can modify auth type, then check if we can do this;
            # if the user is a Platform Admin, we silently leave this unchanged to prevent a security
            # issue where someone could switch their auth type to something less secure
            if service.has_permission('email_auth') and not existing_user.platform_admin:
                if invited_user.auth_type == 'email_auth' or (
                    # they have a phone number, we want them to start using it.
                    # if they dont have a mobile we just ignore that option of the invite
                    existing_user.mobile_number and invited_user.auth_type == 'sms_auth'
                ):
                    existing_user.update(auth_type=invited_user.auth_type)
            existing_user.add_to_service(
                service_id=invited_user.service,
                permissions=invited_user.permissions,
                folder_permissions=invited_user.folder_permissions,
                invited_by_id=invited_user.from_user.id,
            )
            return redirect(url_for('main.service_dashboard', service_id=service.id))
    else:
        return redirect(url_for('main.register_from_invite'))


@main.route("/organisation-invitation/<token>")
def accept_org_invite(token):
    invited_org_user = InvitedOrgUser.from_token(token)

    if not current_user.is_anonymous and current_user.email_address.lower() != invited_org_user.email_address.lower():
        message = Markup("""
            You’re signed in as {}.
            This invite is for another email address.
            <a class="govuk-link govuk-link--no-visited-state" href={}>Sign out</a>
            and click the link again to accept this invite.
            """.format(
            current_user.email_address,
            url_for("main.sign_out")))

        flash(message=message)

        abort(403)

    if invited_org_user.status == 'cancelled':
        organisation = Organisation.from_id(invited_org_user.organisation)
        return render_template('views/cancelled-invitation.html',
                               from_user=invited_org_user.invited_by.name,
                               organisation_name=organisation.name)

    if invited_org_user.status == 'accepted':
        session.pop('invited_org_user_id', None)
        return redirect(url_for('main.organisation_dashboard', org_id=invited_org_user.organisation))

    session['invited_org_user_id'] = invited_org_user.id

    existing_user = User.from_email_address_or_none(invited_org_user.email_address)
    organisation_users = OrganisationUsers(invited_org_user.organisation)

    if existing_user:
        existing_user.update_email_access_validated_at()
        invited_org_user.accept_invite()
        if existing_user not in organisation_users:
            existing_user.add_to_organisation(organisation_id=invited_org_user.organisation)
        return redirect(url_for('main.organisation_dashboard', org_id=invited_org_user.organisation))
    else:
        return redirect(url_for('main.register_from_org_invite'))