---


- name: Check for existing version cache file
  stat:
    path: "{{ atl_product_version_cache }}"
  register: cached

# Case: File exists, always use its value
- name: Use version for product version
  block:

    - name: Read cached version from file
      command: "cat {{ atl_product_version_cache }}"
      register: atl_product_version_file
      changed_when: false

    - name: Set the local var to cached version
      set_fact:
        atl_cached_version: "{{ atl_product_version_file.stdout }}"

  when: cached.stat.exists


- name: Determine if requested version is 'latest'
  set_fact:
    version_is_latest: "{{ atl_product_version is undefined or
                           not atl_product_version or
                           atl_product_version == 'latest' }}"

# Case: File doesn't exist and no version has been set; find latest.
- name: Fetch and cache latest version when no override
  block:

    - name: Fetch the latest edition version
      include_tasks: "{{ atl_product_edition }}_version_latest.yml"

  when: not cached.stat.exists and version_is_latest


######################################################################
# Version logic:
#
# At this point we have 3 values (possibly empty):
#
# * atl_product_version (supplied)
# * atl_cached_version
# * atl_latest_version
#
# If no cached value, use the supplied value or 'latest' if unset.
#
# If a cached file exists, and the requested version is 'latest' (or
# unset), cache wins.
#
# If a version is set, then it is honoured _if_ it is higher than the
# cached value (i.e. upgrade path).

- name: "Case: Version is latest"
  block:

    - name: "Case: Cached version exists, has precedence over 'latest'"
      set_fact:
        atl_download_version: "{{ atl_cached_version }}"
      when: cached.stat.exists

    - name: "Case: No cached version, use latest"
      set_fact:
        atl_download_version: "{{ atl_latest_version }}"
      when: not cached.stat.exists

  when: version_is_latest

- name: "Case: Version is not latest"
  block:

    - name: "Case: No cached version, or but supplied is higher; use supplied"
      set_fact:
        atl_download_version: "{{ atl_product_version }}"
      when: (not cached.stat.exists) or
            atl_product_version is version(atl_cached_version, '>')

    - name: "Case: Cached version is higher, ignore supplied"
      set_fact:
        atl_download_version: "{{ atl_cached_version }}"
      when: cached.stat.exists and
            atl_product_version is version(atl_cached_version, '<=')

  when: not version_is_latest


- name: "Fallthrough guard: Use cached or supplied version if nothing set"
  set_fact:
    atl_download_version: "{{ atl_cached_version or atl_product_version }}"
  when: atl_download_version is not defined or
        atl_download_version|length == 0

- name: Override the supplied version with the calculated one
  set_fact:
    atl_product_version: "{{ atl_download_version }}"

######################################################################

- name: Perform any additional per-edition version setup
  include_tasks: "{{ atl_product_edition }}_extra_tasks.yml"


- name: Create installation directories
  file:
    path: "{{ item }}"
    state: directory
    mode: 0750
    owner: "{{ atl_product_user }}"
    group: "{{ atl_product_user }}"
  with_items:
    - "{{ atl_installer_temp }}"
    - "{{ atl_product_home }}"
    - "{{ atl_product_installation_versioned }}"
    - "{{ atl_product_version_cache_dir }}"
    - "{{ atl_product_home_shared_download_dir }}"
  changed_when: false  # For Molecule idempotence check

# At this point atl_product_version should be set, cache if necessary.
- name: Write override cached version when specified
  template:
    src: version.j2
    dest: "{{ atl_product_version_cache }}"
    force: true

# For the first run a temp binary should be downloaded but moved to
# shared home to ensure all subsequent nodes have access
# to the same specific version binary.
# To prevent a race condition with multiple downloads at the same time
# a directory is used as a lockfile (atomic operation) when moving binary.

- name: Set assumptions to avoid race condition
  set_fact:
    download_binary: true
    move_binary: false
    atl_product_download: "{{ atl_product_temp_download }}"

# Check for product installer in home_shared and lockdir to determine
# if it needs to be downloaded again.
- name: Check for moving lock directory
  stat:
    path: "{{ atl_product_home_shared_moving_lock }}"
  register: moving_lock

- name: Check for downloaded lock directory
  stat:
    path: "{{ atl_product_home_shared_downloaded_lock }}"
  register: downloaded_lock

- name: Check for product installer in home_shared
  stat:
    path: "{{ atl_product_home_shared_download }}"
  register: home_shared_download

# If binary exists and lockdir exists use this binary instead
- name: Check lock directory and binary exists on shared_home
  set_fact:
    download_binary: false
    atl_product_download: "{{ atl_product_home_shared_download }}"
  when:
    - home_shared_download.stat.exists
    - downloaded_lock.stat.isdir is defined
    - downloaded_lock.stat.isdir
    - ( moving_lock.stat.isdir is not defined or moving_lock.stat.isdir == False ) 

# If the binary was never installed, download it to temp location
- name: Installer not on home_shared. Fetch it.
  get_url:
    url: "{{ atl_product_download_url }}"
    dest: "{{ atl_product_temp_download }}"
    mode: 0755
    force: false
  register: atl_product_downloaded
  when: download_binary

# If product installer was fetched to temp, install from there
# If product installer was pre-downloaded on shared_home, install from there
# This is determined by {{ atl_product_download }} variable
- name: Unpack the downloaded application depending on format
  include_tasks: "unpack_{{ atl_download_format }}.yml"

- name: Symlink the installed version to current
  file:
    src: "{{ atl_product_installation_versioned }}"
    dest: "{{ atl_product_installation_current }}"
    state: link
    force: true

# Product is installed. If the following are true, move to home_shared
# 1. This node just downloaded binary.
# 2. Another node is not already moving into place.
- name: "Move product installer"
  block:

  - name: Check again for moving lock directory
    stat:
      path: "{{ atl_product_home_shared_moving_lock }}"
    register: moving_lock_2
  
  - name: Check again for downloaded lock directory
    stat:
      path: "{{ atl_product_home_shared_downloaded_lock }}"
    register: downloaded_lock_2
  
  - name: Check again for product installer in home_shared
    stat:
      path: "{{ atl_product_home_shared_download }}"
    register: home_shared_download_2

  # If binary exists and lockdir exists use this binary instead
  - name: Check lock directory and binary exists on shared_home
    set_fact:
      move_binary: true
      atl_product_download: "{{ atl_product_home_shared_download }}"
    when:
      - home_shared_download.stat.exists == False
      - ( downloaded_lock.stat.isdir is not defined or downloaded_lock.stat.isdir == False )
      - ( moving_lock.stat.isdir is not defined or moving_lock.stat.isdir == False ) 

    - name: Create moving_lock to ensure other nodes skip
      file:
        path: "{{ atl_product_home_shared_moving_lock }}"
        state: directory
      when: move_binary
      register: moving_lock_created

    - name: Copy temp installer to home_shared
      copy:
        src: "{{ atl_product_temp_download }}"
        dest: "{{ atl_product_home_shared_download }}"
        remote_src: true
      when: moving_lock_created is succeeded
      register: copied

    - name: Create downloaded_lock once product installer downloaded and copied
      file:
        path: "{{ atl_product_home_shared_downloaded_lock }}"
        state: directory
      when: copied is succeeded
      register: downloaded_lock_created

    - name: Remove moving_lock to show that binary is completed
      file:
        path: "{{ atl_product_home_shared_moving_lock }}"
        state: absent
      when:
        - downloaded_lock_created is succeeded
        - copied is succeeded
      register: moving_lock_removed

    - name: Delete old temp installer
      file:
        path: "{{ atl_product_temp_download }}"
        state: absent
      when: moving_lock_removed is succeeded
      register: temp_deleted

  when: move_binary