---

#
# Generic tasks, no matter what kind of server we're using (internal/external)
#

- import_tasks: "{{ role_path }}/tasks/migrate_postgres_data_directory.yml"
  when: matrix_postgres_enabled

- import_tasks: "{{ role_path }}/tasks/util/detect_existing_postgres_version.yml"
  when: matrix_postgres_enabled

# If we have found an existing version (installed from before), we use its corresponding Docker image.
# If not, we install using the latest Postgres.
#
# Upgrading is supposed to be performed separately and explicitly (see `upgrade_postgres.yml`).
- set_fact:
    matrix_postgres_docker_image_to_use: "{{ matrix_postgres_docker_image_latest if matrix_postgres_detected_version_corresponding_docker_image == '' else matrix_postgres_detected_version_corresponding_docker_image }}"
  when: matrix_postgres_enabled

- name: Warn if on an old version of Postgres
  debug:
    msg: "NOTE: Your setup is on an old Postgres version ({{ matrix_postgres_docker_image_to_use }}), while {{ matrix_postgres_docker_image_latest }} is supported. You can upgrade using --tags=upgrade-postgres"
  when: "matrix_postgres_enabled and matrix_postgres_docker_image_to_use != matrix_postgres_docker_image_latest"

# Even if we don't run the internal server, we still need this for running the CLI
- name: Ensure postgres Docker image is pulled
  docker_image:
    name: "{{ matrix_postgres_docker_image_to_use }}"
  when: matrix_postgres_enabled

# We always create these directories, even if an external Postgres is used,
# because we store environment variable files there.
- name: Ensure Postgres paths exist
  file:
    path: "{{ item }}"
    state: directory
    mode: 0700
    owner: "{{ matrix_user_username }}"
    group: "{{ matrix_user_username }}"
  with_items:
    - "{{ matrix_postgres_base_path }}"
    - "{{ matrix_postgres_data_path }}"
  when: matrix_postgres_enabled

- name: Ensure Postgres environment variables file created
  template:
    src: "{{ role_path }}/templates/{{ item }}.j2"
    dest: "{{ matrix_postgres_base_path }}/{{ item }}"
    mode: 0640
  with_items:
    - "env-postgres-psql"
    - "env-postgres-server"
  when: matrix_postgres_enabled

- name: Ensure matrix-postgres-cli script created
  template:
    src: "{{ role_path }}/templates/usr-local-bin/matrix-postgres-cli.j2"
    dest: "/usr/local/bin/matrix-postgres-cli"
    mode: 0750
  when: matrix_postgres_enabled

- name: Ensure matrix-make-user-admin script created
  template:
    src: "{{ role_path }}/templates/usr-local-bin/matrix-make-user-admin.j2"
    dest: "/usr/local/bin/matrix-make-user-admin"
    mode: 0750
  when: matrix_postgres_enabled

#
# Tasks related to setting up an internal postgres server
#

- name: Ensure matrix-postgres.service installed
  template:
    src: "{{ role_path }}/templates/systemd/matrix-postgres.service.j2"
    dest: "/etc/systemd/system/matrix-postgres.service"
    mode: 0644
  when: matrix_postgres_enabled

#
# Tasks related to getting rid of the internal postgres server (if it was previously enabled)
#

- name: Check existence of matrix-postgres service
  stat:
    path: "/etc/systemd/system/matrix-postgres.service"
  register: matrix_postgres_service_stat
  when: "not matrix_postgres_enabled"

- name: Ensure matrix-postgres is stopped
  service:
    name: matrix-postgres
    state: stopped
    daemon_reload: yes
  when: "not matrix_postgres_enabled and matrix_postgres_service_stat.stat.exists"

- name: Ensure matrix-postgres.service doesn't exist
  file:
    path: "/etc/systemd/system/matrix-postgres.service"
    state: absent
  when: "not matrix_postgres_enabled and matrix_postgres_service_stat.stat.exists"

- name: Check existence of matrix-postgres local data path
  stat:
    path: "{{ matrix_postgres_data_path }}"
  register: matrix_postgres_data_path_stat
  when: "not matrix_postgres_enabled"

# We just want to notify the user. Deleting data is too destructive.
- name: Notify if matrix-postgres local data remains
  debug:
    msg: "Note: You are not using a local PostgreSQL database, but some old data remains from before in `{{ matrix_postgres_data_path }}`. Feel free to delete it."
  when: "not matrix_postgres_enabled and matrix_postgres_data_path_stat.stat.exists"