---


- 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 pre-downloaded binary on shared_home and completed lock dir.
- name: Check for completed lock directory
  stat:
    path: "{{ atl_product_home_shared_completed_lock }}"
  register: completed_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
    - completed_lock.stat.isdir is defined
    - completed_lock.stat.isdir

# Fetch binary if required
- name: download_binary is true so fetch and do all the things
  block:

    # Fetch binary and copy to temp
    - name: Fetch binary
      get_url:
        url: "{{ atl_product_download_url }}"
        dest: "{{ atl_product_temp_download }}"
        mode: 0755
        force: false
      register: atl_product_completed

    # If product installer was fetched make the lock directory
    - name: Create moving_lock.
      file:
        path: "{{ atl_product_home_shared_moving_lock }}"
        state: directory
      when:
        - atl_product_completed is succeeded
      register: moving_lock_created

    # Directory lock was created by this run?
    # If so, then set a fact intending to move binary
    - name: Move binary Scenario - lock created by this run
      set_fact:
        move_binary: true
      when:
        - moving_lock_created is succeeded
        - moving_lock_created.changed == True
        # Otherwise directory lock was either already created or
        # could not be created. Fall back is to continue and install from temp

  when: download_binary

# If the intention is to move binary to home_shared
- name: Move product installer to home_shared
  block:

    - 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
        - moving_lock_created.changed == True
      register: copied

    - name: Create completed_lock once product installer downloaded and copied
      file:
        path: "{{ atl_product_home_shared_completed_lock }}"
        state: directory
      when: copied is succeeded
      register: completed_lock_created

    - name: Remove moving_lock to show that binary is completed
      file:
        path: "{{ atl_product_home_shared_moving_lock }}"
        state: absent
      when:
        - completed_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

    - name: Set install to home_shared location
      set_fact:
        atl_product_download: "{{ atl_product_home_shared_download }}"
      when: temp_deleted is succeeded

  when: move_binary

# At this point the binary is in {{ atl_product_download }}
# (which is either on home_shared or temp)
- 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