---
# See https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1070
# and https://github.com/spantaleev/matrix-docker-ansible-deploy/commit/1ab507349c752042d26def3e95884f6df8886b74#commitcomment-51108407
- name: Fail if trying to self-build on Ansible < 2.8
  fail:
    msg: "To self-build the Element image, you should use Ansible 2.8 or higher. See docs/ansible.md"
  when: "ansible_version.major == 2 and ansible_version.minor < 8 and matrix_appservice_slack_container_image_self_build and matrix_appservice_slack_enabled"

# 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
  fail:
    msg: >-
      The matrix-bridge-appservice-slack role needs to execute before the matrix-synapse role.
  when: "matrix_synapse_role_executed|default(False)"

- set_fact:
    matrix_systemd_services_list: "{{ matrix_systemd_services_list + ['matrix-appservice-slack.service'] }}"
  when: matrix_appservice_slack_enabled|bool

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

    matrix_synapse_app_service_config_files: >
      {{ matrix_synapse_app_service_config_files|default([]) }}
      +
      {{ ["/matrix-appservice-slack-registration.yaml"] }}
  when: matrix_appservice_slack_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
  fail:
    msg: >-
      The matrix-bridge-appservice-slack 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
      fail:
        msg: >-
          Trying to append Slack 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-slack role.
      when: matrix_nginx_proxy_role_executed|default(False)|bool

    - name: Generate Matrix Appservice Slack proxying configuration for matrix-nginx-proxy
      set_fact:
        matrix_appservice_slack_matrix_nginx_proxy_configuration: |
          location {{ matrix_appservice_slack_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_appservice_slack_appservice_url }}:{{ matrix_appservice_slack_slack_port }}";
              proxy_pass $backend;
          {% else %}
              {# Generic configuration for use outside of our container setup #}
              proxy_pass http://127.0.0.1:{{ matrix_appservice_slack_slack_port }};
          {% endif %}
          }

    - name: Register Slack Appservice proxying configuration with matrix-nginx-proxy
      set_fact:
        matrix_nginx_proxy_proxy_matrix_additional_server_configuration_blocks: |
          {{
            matrix_nginx_proxy_proxy_matrix_additional_server_configuration_blocks|default([])
            +
            [matrix_appservice_slack_matrix_nginx_proxy_configuration]
          }}
  tags:
    - always
  when: matrix_appservice_slack_enabled|bool

- name: Warn about reverse-proxying if matrix-nginx-proxy not used
  debug:
    msg: >-
      NOTE: You've enabled the Matrix Slack bridge but are not using the matrix-nginx-proxy
      reverse proxy.
      Please make sure that you're proxying the `{{ something }}`
      URL endpoint to the matrix-appservice-slack container.
      You can expose the container's port using the `matrix_appservice_slack_container_http_host_bind_port` variable.
  when: "matrix_appservice_slack_enabled|bool and matrix_nginx_proxy_enabled is not defined"