---
# https://docs.ansible.com/ansible/latest/collections/community/docker/docker_container_module.html#ansible-collections-community-docker-docker-container-module
# https://docs.docker.com/storage/volumes/#backup-restore-or-migrate-data-volumes

- name: Determine backup timestamp.
  ansible.builtin.set_fact: backup_time="{{ ansible_date_time.iso8601 }}"

- name: Install Python dependencies
  ansible.builtin.pip:
    name:
      - docker
      - boto3

- name: Stop a container
  community.docker.docker_container:
    name: "{{ container_backup }}"
    state: stopped

- name: Get container details
  docker_container_info:
    name: "{{ container_backup }}"
  register: result

- name: Extract only the volume mounts (not bind mounts)
  ansible.builtin.set_fact: volume_mounts="{{ result.container.Mounts | selectattr("Type", "equalto", "volume") }}"

- name: Create Backup of Container Volumes
  community.docker.docker_container:
    name: "backup-container-{{ item.Name }}-{{ 10 | random }}"
    image: ubuntu
    command: "tar -czvf /backups/{{ item.Name }}-{{ backup_time }}.tar.gz /data"
    auto_remove: true
    detach: false # block until this container exists.
    state: started
    volumes:
      - "{{ item.Name }}:/data"
      - "{{ docker_backup_host_backup_directory }}:/backups"
  with_items: "{{ volume_mounts }}"

- name: Start the container
  community.docker.docker_container:
    name: "{{ container_backup }}"
    state: started

- name: Upload backups to S3
  register: upload_result
  amazon.aws.aws_s3:
    s3_url: "{{ docker_backup_aws_s3_url }}"
    bucket: "{{ docker_backup_aws_s3_bucket }}"
    object: "{{ item.Name }}/{{ item.Name }}-{{ backup_time }}.tar.gz"
    src: "{{ docker_backup_host_backup_directory }}/{{ item.Name }}-{{ backup_time }}.tar.gz"
    aws_access_key: "{{ docker_backup_aws_s3_aws_access_key }}"
    aws_secret_key: "{{ docker_backup_aws_s3_aws_secret_key }}"
    region: "{{ docker_backup_aws_s3_region }}"
    mode: put
    permission: "{{ docker_backup_aws_s3_permissions }}"
  with_items: "{{ volume_mounts }}"

# try and find latest volume based on the name.
- name: Fetch Volumes From S3.
  amazon.aws.aws_s3:
    bucket: "{{ docker_backup_aws_s3_bucket }}"
    mode: list
    prefix: "{{ item.Name }}/{{ item.Name }}"
    aws_access_key: "{{ docker_backup_aws_s3_aws_access_key }}"
    aws_secret_key: "{{ docker_backup_aws_s3_aws_secret_key }}"
    region: "{{ docker_backup_aws_s3_region }}"
    s3_url: "{{ docker_backup_aws_s3_url }}"
  register: s3_list_outputs
  with_items: "{{ volume_mounts }}"

# TODO: do this in a more native way rather than a python script reading env vars.
- name: Determine which backups should be deleted.
  script: scripts/determine-s3-keys-to-delete.py
  environment:
    S3_RESULTS: "{{ s3_list_outputs.results }}"
    NUM_BACKUPS_TO_KEEP: "{{ docker_backup_retain_count}}"
  register: python_output
  changed_when: false

- name: Delete old backups.
  amazon.aws.aws_s3:
    bucket: "{{ docker_backup_aws_s3_bucket }}"
    aws_access_key: "{{ docker_backup_aws_s3_aws_access_key }}"
    aws_secret_key: "{{ docker_backup_aws_s3_aws_secret_key }}"
    region: "{{ docker_backup_aws_s3_region }}"
    s3_url: "{{ docker_backup_aws_s3_url }}"
    object: "{{ item }}"
    mode: delobj
  with_items: "{{ python_output.stdout_lines }}"