---

- 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: "not matrix_nginx_proxy_enabled | default(False) | bool"