---
- name: Check whether podman is installed
  ansible.builtin.command: podman --version
  register: trade_hub_podman_check
  changed_when: false
  failed_when: false
  check_mode: false

- name: Install podman when requested
  ansible.builtin.package:
    name: podman
    state: present
  become: true
  when:
    - trade_hub_podman_check.rc != 0
    - trade_hub_install_podman | bool

- name: Re-check podman after installation
  ansible.builtin.command: podman --version
  register: trade_hub_podman_recheck
  changed_when: false
  failed_when: false
  check_mode: false
  when: trade_hub_podman_check.rc != 0

- name: Require podman to be available
  ansible.builtin.assert:
    that:
      - trade_hub_podman_check.rc == 0 or (trade_hub_podman_recheck.rc | default(1)) == 0
    fail_msg: >-
      podman is not installed on {{ inventory_hostname }}. Install it first
      (for example with the "packages" role) or run this role with
      -e trade_hub_install_podman=true.
    quiet: true

- name: Remove the legacy Apache container when requested
  containers.podman.podman_container:
    name: "{{ trade_hub_legacy_apache_container }}"
    state: absent
  when: trade_hub_remove_legacy_apache | bool

- name: Create the application directory
  ansible.builtin.file:
    path: "{{ trade_hub_app_dir }}"
    state: directory
    mode: "0755"

- name: Create the application source directories
  ansible.builtin.file:
    path: "{{ trade_hub_app_dir }}/{{ item }}"
    state: directory
    mode: "0755"
  loop: "{{ trade_hub_app_subdirs }}"

- name: Stage the application build context
  ansible.builtin.copy:
    src: "{{ role_path }}/files/trade-hub/{{ item.src }}"
    dest: "{{ trade_hub_app_dir }}/{{ item.dest }}"
    mode: preserve
  loop:
    # Only the files needed by the two Dockerfiles are staged. Copying the
    # whole tree would also ship local development artefacts such as .venv.
    - { src: "backend/Dockerfile", dest: "backend/Dockerfile" }
    - { src: "backend/requirements.txt", dest: "backend/requirements.txt" }
    - { src: "backend/main.py", dest: "backend/main.py" }
    - { src: "backend/app/", dest: "backend/app/" }
    - { src: "backend/scripts/", dest: "backend/scripts/" }
    - { src: "frontend/Dockerfile", dest: "frontend/Dockerfile" }
    - { src: "frontend/nginx.conf", dest: "frontend/nginx.conf" }
    - { src: "frontend/src/", dest: "frontend/src/" }
  register: trade_hub_source

- name: Check whether the backend image exists
  ansible.builtin.command:
    argv:
      - podman
      - image
      - exists
      - "{{ trade_hub_backend_image }}:{{ trade_hub_image_tag }}"
  register: trade_hub_backend_image_check
  changed_when: false
  failed_when: false
  check_mode: false

- name: Check whether the frontend image exists
  ansible.builtin.command:
    argv:
      - podman
      - image
      - exists
      - "{{ trade_hub_frontend_image }}:{{ trade_hub_image_tag }}"
  register: trade_hub_frontend_image_check
  changed_when: false
  failed_when: false
  check_mode: false

- name: Build the backend image
  ansible.builtin.command:
    argv:
      - podman
      - build
      - --tag
      - "{{ trade_hub_backend_image }}:{{ trade_hub_image_tag }}"
      - "{{ trade_hub_app_dir }}/backend"
  when:
    - trade_hub_build_images | bool
    - trade_hub_force_rebuild | bool or trade_hub_source.changed or trade_hub_backend_image_check.rc != 0
  register: trade_hub_backend_build

- name: Build the frontend image
  ansible.builtin.command:
    argv:
      - podman
      - build
      - --tag
      - "{{ trade_hub_frontend_image }}:{{ trade_hub_image_tag }}"
      - "{{ trade_hub_app_dir }}/frontend"
  when:
    - trade_hub_build_images | bool
    - trade_hub_force_rebuild | bool or trade_hub_source.changed or trade_hub_frontend_image_check.rc != 0
  register: trade_hub_frontend_build

- name: Require prebuilt images when image builds are disabled
  ansible.builtin.assert:
    that:
      - trade_hub_backend_image_check.rc == 0
      - trade_hub_frontend_image_check.rc == 0
    fail_msg: >-
      trade_hub_build_images is false but {{ trade_hub_backend_image }}:{{
      trade_hub_image_tag }} and/or {{ trade_hub_frontend_image }}:{{
      trade_hub_image_tag }} are missing on {{ inventory_hostname }}.
    quiet: true
  when: not trade_hub_build_images | bool

- name: Record whether the application containers need to be recreated
  ansible.builtin.set_fact:
    trade_hub_recreate_containers: >-
      {{ (trade_hub_force_rebuild | bool)
         or ((trade_hub_build_images | bool) and (trade_hub_source.changed | default(false)))
         or (trade_hub_backend_build.changed | default(false))
         or (trade_hub_frontend_build.changed | default(false)) }}

- name: Ensure the PostgreSQL image is present
  containers.podman.podman_image:
    name: "{{ trade_hub_postgres_image }}"
    state: present
  when: not ansible_check_mode

- name: Create the podman network
  containers.podman.podman_network:
    name: "{{ trade_hub_network }}"
    state: present

- name: Check whether the shared proxy network exists
  ansible.builtin.command: podman network exists npm_internal
  register: trade_hub_npm_network_check
  changed_when: false
  failed_when: false
  check_mode: false

- name: Require the shared proxy network to exist
  ansible.builtin.assert:
    that:
      - trade_hub_npm_network_check.rc == 0
    fail_msg: >-
      The npm_internal podman network does not exist on {{ inventory_hostname }}.
      Run the network role first, e.g.
      ansible-playbook -i inventory.ini ansible-playbook.yml --tags "network,trade_hub".
    quiet: true

- name: Create the PostgreSQL data volume
  containers.podman.podman_volume:
    name: "{{ trade_hub_volume }}"
    state: present

- name: Run the PostgreSQL container
  containers.podman.podman_container:
    name: "{{ trade_hub_db_container }}"
    image: "{{ trade_hub_postgres_image }}"
    state: started
    recreate: "{{ trade_hub_force_rebuild | bool }}"
    network: "{{ trade_hub_network }}"
    network_aliases:
      - db
    env:
      POSTGRES_USER: "{{ trade_hub_postgres_user }}"
      POSTGRES_PASSWORD: "{{ trade_hub_postgres_password }}"
      POSTGRES_DB: "{{ trade_hub_postgres_db }}"
    volumes:
      - "{{ trade_hub_volume }}:/var/lib/postgresql/data:Z"
    restart_policy: unless-stopped
  when: not ansible_check_mode

- name: Run the backend container
  containers.podman.podman_container:
    name: "{{ trade_hub_backend_container }}"
    image: "{{ trade_hub_backend_image }}:{{ trade_hub_image_tag }}"
    state: started
    # podman does not recreate a container when its image tag resolves to a new
    # ID, so recreate whenever the image was rebuilt or the app changed.
    recreate: "{{ trade_hub_recreate_containers | bool }}"
    network: "{{ trade_hub_network }}"
    # The nginx upstream is http://backend:8000, so this alias must match.
    network_aliases:
      - backend
    env:
      DATABASE_URL: "{{ trade_hub_database_url }}"
      DB_WAIT_SECONDS: "{{ trade_hub_db_wait_seconds }}"
      COOKIE_SECURE: "{{ trade_hub_cookie_secure | bool | lower }}"
    restart_policy: unless-stopped
  when: not ansible_check_mode

- name: Run the frontend container
  containers.podman.podman_container:
    name: "{{ trade_hub_frontend_container }}"
    image: "{{ trade_hub_frontend_image }}:{{ trade_hub_image_tag }}"
    state: started
    recreate: "{{ trade_hub_recreate_containers | bool }}"
    # Keep sc-inventory for the "backend" DNS alias and join the shared proxy
    # network with a fixed address so the proxy-manager upstream never changes.
    network:
      - "{{ trade_hub_network }}"
      - "npm_internal:ip={{ trade_hub_frontend_ip }}"
    ports:
      - "{{ trade_hub_frontend_bind }}:{{ trade_hub_frontend_port }}:{{ trade_hub_frontend_port }}"
    restart_policy: unless-stopped
  when: not ansible_check_mode

- name: Enable podman-restart so containers survive a reboot
  ansible.builtin.systemd:
    name: podman-restart.service
    enabled: true
    state: started
  when: trade_hub_enable_restart_service | bool

- name: Wait for the application to answer health checks
  ansible.builtin.uri:
    url: "{{ trade_hub_healthcheck_url }}"
    status_code: 200
  register: trade_hub_health
  until: trade_hub_health.status == 200
  retries: "{{ trade_hub_healthcheck_retries }}"
  delay: "{{ trade_hub_healthcheck_delay }}"
  changed_when: false
  when: not ansible_check_mode