---

- when: matrix_registration_enabled | bool
  tags:
    - always
  block:
    - name: Fail if matrix-nginx-proxy role already executed
      ansible.builtin.fail:
        msg: >-
          Trying to append matrix-registration's reverse-proxying configuration to matrix-nginx-proxy,
          but it's pointless since the matrix-nginx-proxy role had already executed.
          To fix this, please change the order of roles in your playbook,
          so that the matrix-nginx-proxy role would run after the matrix-registration role.
      when: matrix_nginx_proxy_role_executed | default(False) | bool

    - name: Generate matrix-registration proxying configuration for matrix-nginx-proxy
      ansible.builtin.set_fact:
        matrix_registration_matrix_nginx_proxy_configuration: |
          rewrite ^{{ matrix_registration_public_endpoint }}$ {{ matrix_nginx_proxy_x_forwarded_proto_value }}://$server_name{{ matrix_registration_public_endpoint }}/ permanent;
          rewrite ^{{ matrix_registration_public_endpoint }}/$ {{ matrix_nginx_proxy_x_forwarded_proto_value }}://$server_name{{ matrix_registration_public_endpoint }}/register redirect;

          location ~ ^{{ matrix_registration_public_endpoint }}/(.*) {
          {% if matrix_nginx_proxy_enabled | default(False) %}
            {# Use the embedded DNS resolver in Docker containers to discover the service #}
            resolver 127.0.0.11 valid=5s;
            set $backend "matrix-registration:5000";
            proxy_pass http://$backend/$1;
          {% else %}
            {# Generic configuration for use outside of our container setup #}
            proxy_pass http://127.0.0.1:8767/$1;
          {% endif %}

            {#
              Workaround matrix-registration serving the background image at /static
              (see https://github.com/ZerataX/matrix-registration/issues/47)
            #}
            sub_filter_once off;
            sub_filter_types text/css;
            sub_filter "/static/" "{{ matrix_registration_public_endpoint }}/static/";
          }

    - name: Register matrix-registration proxying configuration with matrix-nginx-proxy
      ansible.builtin.set_fact:
        matrix_nginx_proxy_proxy_matrix_additional_server_configuration_blocks: |
          {{
            matrix_nginx_proxy_proxy_matrix_additional_server_configuration_blocks | default([])
            +
            [matrix_registration_matrix_nginx_proxy_configuration]
          }}

- name: Warn about reverse-proxying if matrix-nginx-proxy not used
  ansible.builtin.debug:
    msg: >-
      NOTE: You've enabled the matrix-registration tool but are not using the matrix-nginx-proxy
      reverse proxy.
      Please make sure that you're proxying the `{{ matrix_registration_public_endpoint }}`
      URL endpoint to the matrix-registration container.
      You can expose the container's port using the `matrix_registration_container_http_host_bind_port` variable.
  when: "matrix_registration_enabled | bool and not matrix_nginx_proxy_enabled | default(False) | bool"