---

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

- ansible.builtin.import_tasks: "{{ role_path }}/tasks/migrate_postgres_data_directory.yml"
  when: matrix_postgres_enabled | bool

- ansible.builtin.import_tasks: "{{ role_path }}/tasks/detect_existing_postgres_version.yml"
  when: matrix_postgres_enabled | bool

# 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`).
- ansible.builtin.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 | bool

- name: Abort if on an unsupported Postgres version
  ansible.builtin.fail:
    msg: "You're on Postgres {{ matrix_postgres_detected_version }}, which is no longer supported. To upgrade, see docs/maintenance-postgres.md"
  when: "matrix_postgres_enabled | bool and matrix_postgres_detected_version.startswith('9.')"

- name: Inject warning if on an old version of Postgres
  ansible.builtin.set_fact:
    matrix_playbook_runtime_results: |
      {{
        matrix_playbook_runtime_results | default([])
        +
        [
          "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 | bool 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 }}"
    source: "{{ 'pull' if ansible_version.major > 2 or ansible_version.minor > 7 else omit }}"
    force_source: "{{ matrix_postgres_docker_image_force_pull if ansible_version.major > 2 or ansible_version.minor >= 8 else omit }}"
    force: "{{ omit if ansible_version.major > 2 or ansible_version.minor >= 8 else matrix_postgres_docker_image_force_pull }}"
  when: matrix_postgres_enabled | bool
  register: result
  retries: "{{ matrix_container_retries_count }}"
  delay: "{{ matrix_container_retries_delay }}"
  until: result is not failed

- name: Ensure Postgres paths exist
  ansible.builtin.file:
    path: "{{ item }}"
    state: directory
    mode: 0700
    owner: "{{ matrix_user_username }}"
    group: "{{ matrix_user_groupname }}"
  with_items:
    - "{{ matrix_postgres_base_path }}"
    - "{{ matrix_postgres_data_path }}"
  when: matrix_postgres_enabled | bool

# We do this as a separate task, because:
# - we'd like to do it for the data path only, not for the base path (which contains root-owned environment variable files we'd like to leave as-is)
# - we need to do it without `mode`, or we risk making certain `.conf` and other files's executable bit to flip to true
- name: Ensure Postgres data path ownership is correct
  ansible.builtin.file:
    path: "{{ matrix_postgres_data_path }}"
    state: directory
    owner: "{{ matrix_user_username }}"
    group: "{{ matrix_user_groupname }}"
    recurse: true
  when: matrix_postgres_enabled | bool

- name: Ensure Postgres environment variables file created
  ansible.builtin.template:
    src: "{{ role_path }}/templates/{{ item }}.j2"
    dest: "{{ matrix_postgres_base_path }}/{{ item }}"
    owner: "{{ matrix_user_username }}"
    group: "{{ matrix_user_groupname }}"
    mode: 0640
  with_items:
    - "env-postgres-psql"
    - "env-postgres-server"
  when: matrix_postgres_enabled | bool

- name: Ensure matrix-postgres-cli script created
  ansible.builtin.template:
    src: "{{ role_path }}/templates/usr-local-bin/matrix-postgres-cli.j2"
    dest: "{{ matrix_local_bin_path }}/matrix-postgres-cli"
    mode: 0755
  when: matrix_postgres_enabled | bool

- name: Ensure matrix-postgres-cli-non-interactive script created
  ansible.builtin.template:
    src: "{{ role_path }}/templates/usr-local-bin/matrix-postgres-cli-non-interactive.j2"
    dest: "{{ matrix_local_bin_path }}/matrix-postgres-cli-non-interactive"
    mode: 0755
  when: matrix_postgres_enabled | bool

- name: Ensure matrix-change-user-admin-status script created
  ansible.builtin.template:
    src: "{{ role_path }}/templates/usr-local-bin/matrix-change-user-admin-status.j2"
    dest: "{{ matrix_local_bin_path }}/matrix-change-user-admin-status"
    mode: 0755
  when: matrix_postgres_enabled | bool

- name: (Migration) Ensure old matrix-make-user-admin script deleted
  ansible.builtin.file:
    path: "{{ matrix_local_bin_path }}/matrix-make-user-admin"
    state: absent
  when: matrix_postgres_enabled | bool

- name: Ensure matrix-postgres-update-user-password-hash script created
  ansible.builtin.template:
    src: "{{ role_path }}/templates/usr-local-bin/matrix-postgres-update-user-password-hash.j2"
    dest: "{{ matrix_local_bin_path }}/matrix-postgres-update-user-password-hash"
    mode: 0755
  when: matrix_postgres_enabled | bool

- name: Ensure matrix-postgres.service installed
  ansible.builtin.template:
    src: "{{ role_path }}/templates/systemd/matrix-postgres.service.j2"
    dest: "{{ matrix_systemd_path }}/matrix-postgres.service"
    mode: 0644
  register: matrix_postgres_systemd_service_result
  when: matrix_postgres_enabled | bool

- name: Ensure systemd reloaded after matrix-postgres.service installation
  ansible.builtin.service:
    daemon_reload: true
  when: "matrix_postgres_enabled | bool and matrix_postgres_systemd_service_result.changed"

- ansible.builtin.include_tasks:
    file: "{{ role_path }}/tasks/util/create_additional_databases.yml"
    apply:
      tags:
        - always
  when: "matrix_postgres_enabled | bool and matrix_postgres_additional_databases|length > 0"

- name: Check existence of matrix-postgres backup data path
  ansible.builtin.stat:
    path: "{{ matrix_postgres_data_path }}-auto-upgrade-backup"
  register: matrix_postgres_data_backup_path_stat
  when: "matrix_postgres_enabled | bool"

- name: Inject warning if backup data remains
  ansible.builtin.set_fact:
    matrix_playbook_runtime_results: |
      {{
        matrix_playbook_runtime_results | default([])
        +
        [
          "NOTE: You have some Postgres backup data in `{{ matrix_postgres_data_path }}-auto-upgrade-backup`, which was created during the last major Postgres update you ran. If your setup works well after this upgrade, feel free to delete this whole directory."
        ]
      }}
  when: "matrix_postgres_enabled | bool and matrix_postgres_data_backup_path_stat.stat.exists"


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

- name: Check existence of matrix-postgres service
  ansible.builtin.stat:
    path: "{{ matrix_systemd_path }}/matrix-postgres.service"
  register: matrix_postgres_service_stat
  when: "not matrix_postgres_enabled | bool"

- name: Ensure matrix-postgres is stopped
  ansible.builtin.service:
    name: matrix-postgres
    state: stopped
    daemon_reload: true
  when: "not matrix_postgres_enabled | bool and matrix_postgres_service_stat.stat.exists"

- name: Ensure matrix-postgres.service doesn't exist
  ansible.builtin.file:
    path: "{{ matrix_systemd_path }}/matrix-postgres.service"
    state: absent
  when: "not matrix_postgres_enabled | bool and matrix_postgres_service_stat.stat.exists"

- name: Ensure systemd reloaded after matrix-postgres.service removal
  ansible.builtin.service:
    daemon_reload: true
  when: "not matrix_postgres_enabled | bool and matrix_postgres_service_stat.stat.exists"

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

# We just want to notify the user. Deleting data is too destructive.
- name: Inject warning if matrix-postgres local data remains
  ansible.builtin.set_fact:
    matrix_playbook_runtime_results: |
      {{
        matrix_playbook_runtime_results | default([])
        +
        [
          "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 | bool and matrix_postgres_data_path_stat.stat.exists"

- name: Remove Postgres scripts
  ansible.builtin.file:
    path: "{{ matrix_local_bin_path }}/{{ item }}"
    state: absent
  with_items:
    - matrix-postgres-cli
    - matrix-change-user-admin-status
    - matrix-postgres-update-user-password-hash
  when: "not matrix_postgres_enabled | bool"
