---
# If the matrix-synapse role is not used, `matrix_synapse_role_executed` won't exist.
# We don't want to fail in such cases.
- name: Fail if matrix-synapse role already executed
  ansible.builtin.fail:
    msg: >-
      The matrix-bridge-appservice-webhooks role needs to execute before the matrix-synapse role.
  when: "matrix_synapse_role_executed | default(False)"

- ansible.builtin.set_fact:
    matrix_systemd_services_list: "{{ matrix_systemd_services_list + ['matrix-appservice-webhooks.service'] }}"
  when: matrix_appservice_webhooks_enabled | bool

# If the matrix-synapse role is not used, these variables may not exist.
- ansible.builtin.set_fact:
    matrix_homeserver_container_runtime_injected_arguments: >
      {{
        matrix_homeserver_container_runtime_injected_arguments | default([])
        +
        ["--mount type=bind,src={{ matrix_appservice_webhooks_config_path }}/webhooks-registration.yaml,dst=/matrix-appservice-webhooks-registration.yaml,ro"]
      }}

    matrix_homeserver_app_service_runtime_injected_config_files: >
      {{
        matrix_homeserver_app_service_runtime_injected_config_files | default([])
        +
        ["/matrix-appservice-webhooks-registration.yaml"]
      }}
  when: matrix_appservice_webhooks_enabled | bool

# If the matrix-synapse role is not used, `matrix_synapse_role_executed` won't exist.
# We don't want to fail in such cases.
- name: Fail if matrix-synapse role already executed
  ansible.builtin.fail:
    msg: >-
      The matrix-bridge-appservice-webhooks role needs to execute before the matrix-synapse role.
  when: "matrix_synapse_role_executed | default(False)"

- block:
    - name: Fail if matrix-nginx-proxy role already executed
      ansible.builtin.fail:
        msg: >-
          Trying to append webhooks Appservice'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-bridge-appservice-webhooks role.
      when: matrix_nginx_proxy_role_executed | default(False) | bool

    - name: Generate Matrix Appservice webhooks proxying configuration for matrix-nginx-proxy
      ansible.builtin.set_fact:
        matrix_appservice_webhooks_matrix_nginx_proxy_configuration: |
          {% if matrix_nginx_proxy_enabled | default(False) %}
          {# Use the embedded DNS resolver in Docker containers to discover the service #}
          location ~ ^{{ matrix_appservice_webhooks_public_endpoint }}/(.*)$ {
            resolver 127.0.0.11 valid=5s;
            set $backend "matrix-appservice-webhooks:{{ matrix_appservice_webhooks_matrix_port }}";
            proxy_pass http://$backend/$1;
          }
          {% else %}
          {# Generic configuration for use outside of our container setup #}
          location {{ matrix_appservice_webhooks_public_endpoint }}/ {
            proxy_pass http://127.0.0.1:{{ matrix_appservice_webhooks_matrix_port }}/;
          }
          {% endif %}

    - name: Register webhooks Appservice 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_appservice_webhooks_matrix_nginx_proxy_configuration]
          }}
  tags:
    - always
  when: matrix_appservice_webhooks_enabled | bool

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