---

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

- name: Determine existing Postgres version (check PG_VERSION file)
  stat:
    path: "{{ matrix_postgres_data_path }}/PG_VERSION"
  register: result_pg_version_stat

- name: Determine existing Postgres version (read PG_VERSION file)
  slurp:
    src: "{{ matrix_postgres_data_path }}/PG_VERSION"
  register: result_pg_version
  when: "result_pg_version_stat.stat.exists"

- name: Determine existing Postgres version (default to empty)
  set_fact:
    pg_version: ""

- name: Determine existing Postgres version (make sense of PG_VERSION file)
  set_fact:
    pg_version: "{{ result_pg_version['content']|b64decode|replace('\n', '') }}"
  when: "result_pg_version_stat.stat.exists"

- name: Determine Postgres version to use (default to latest)
  set_fact:
    matrix_postgres_docker_image_to_use: "{{ matrix_postgres_docker_image_latest }}"

- name: Determine Postgres version to use (use 9.x, if detected)
  set_fact:
    matrix_postgres_docker_image_to_use: "{{ matrix_postgres_docker_image_v9 }}"
  when: "pg_version.startswith('9.')"

- name: Determine Postgres version to use (use 10.x, if detected)
  set_fact:
    matrix_postgres_docker_image_to_use: "{{ matrix_postgres_docker_image_v10 }}"
  when: "pg_version == '10' or pg_version.startswith('10.')"

- 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_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 }}"

- name: Ensure Postgres environment variables file created
  template:
    src: "{{ role_path }}/templates/env/{{ item }}.j2"
    dest: "{{ matrix_environment_variables_data_path }}/{{ item }}"
    mode: 0640
  with_items:
    - "env-postgres-pgsql-docker"
    - "env-postgres-server-docker"

- 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

- 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

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

- name: Ensure postgres data path exists
  file:
    path: "{{ matrix_postgres_data_path }}"
    state: directory
    mode: 0700
    owner: "{{ matrix_user_username }}"
    group: "{{ matrix_user_username }}"
  when: "not matrix_postgres_use_external"

- 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: "not matrix_postgres_use_external"

#
# 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: matrix_postgres_use_external

- name: Ensure matrix-postgres is stopped
  service: name=matrix-postgres state=stopped daemon_reload=yes
  when: "matrix_postgres_use_external 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: "matrix_postgres_use_external 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: matrix_postgres_use_external

# 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 that."
  when: "matrix_postgres_use_external and matrix_postgres_data_path_stat.stat.exists"