- vars:
    task_parameters: &task_parameters
      become_user: "{{ pg_user }}"
      become: True
      register: result
    task_parameters_readonly: &task_parameters_readonly
      become_user: "{{ pg_user }}"
      become: True
      register: result
      environment:
        PGOPTIONS: '-c default_transaction_read_only=on' # ensure 'alter user' query isn't executed
    postgresql_parameters: &parameters
      db: postgres
      name: "{{ db_user1 }}"
      login_user: "{{ pg_user }}"

  block: # block is only used here in order to be able to define YAML anchors at the beginning in 'vars' section
  - name: 'Check that PGOPTIONS environment variable is effective (1/2)'
    <<: *task_parameters_readonly
    postgresql_user:
      <<: *parameters
      password: '{{ db_password1 }}'
    ignore_errors: true

  - name: 'Check that PGOPTIONS environment variable is effective (2/2)'
    assert:
      that:
          - "{{ result|failed }}"

  - name: 'Create a user (password encrypted: {{ encrypted }})'
    <<: *task_parameters
    postgresql_user:
      <<: *parameters
      password: '{{ db_password1 }}'
      encrypted: '{{ encrypted }}'

  - block: &changed # block is only used here in order to be able to define YAML anchor
    - name: Check that ansible reports it was created
      assert:
        that:
          - "{{ result|changed }}"

  - name: Check that it was created
    <<: *task_parameters
    shell: echo "select * from pg_user where usename='{{ db_user1 }}';" | psql -d postgres

  - assert:
      that:
        - "result.stdout_lines[-1] == '(1 row)'"

  - name: Check that creating user a second time does nothing
    <<: *task_parameters_readonly
    postgresql_user:
      <<: *parameters
      password: '{{ db_password1 }}'
      encrypted: '{{ encrypted }}'

  - block: &not_changed # block is only used here in order to be able to define YAML anchor
    - name: Check that ansible reports no change
      assert:
        that:
          - "{{ not result|changed }}"

  - block:

    - name: 'Using MD5-hashed password: check that password not changed when using cleartext password'
      <<: *task_parameters_readonly
      postgresql_user:
        <<: *parameters
        password: '{{ db_password1 }}'
        encrypted: 'yes'

    - <<: *not_changed

    - name: "Using MD5-hashed password: check that password not changed when using md5 hash with 'ENCRYPTED'"
      <<: *task_parameters_readonly
      postgresql_user:
        <<: *parameters
        password: "md5{{ (db_password1 ~ db_user1) | hash('md5')}}"
        encrypted: 'yes'

    - <<: *not_changed

    - name: "Using MD5-hashed password: check that password not changed when using md5 hash with 'UNENCRYPTED'"
      <<: *task_parameters_readonly
      postgresql_user:
        <<: *parameters
        password: "md5{{ (db_password1 ~ db_user1) | hash('md5')}}"
        encrypted: 'no'

    - <<: *not_changed

    - name: 'Using MD5-hashed password: check that password changed when using another cleartext password'
      <<: *task_parameters
      postgresql_user:
        <<: *parameters
        password: 'prefix{{ db_password1 }}'
        encrypted: 'yes'

    - <<: *changed

    - name: "Using MD5-hashed password: check that password changed when using another md5 hash with 'ENCRYPTED'"
      <<: *task_parameters
      postgresql_user:
        <<: *parameters
        password: "md5{{ ('prefix1' ~ db_password1 ~ db_user1) | hash('md5')}}"
        encrypted: 'yes'

    - <<: *changed

    - name: "Using MD5-hashed password: check that password changed when using md5 hash with 'UNENCRYPTED'"
      <<: *task_parameters
      postgresql_user:
        <<: *parameters
        password: "md5{{ ('prefix2' ~ db_password1 ~ db_user1) | hash('md5')}}"
        encrypted: 'no'

    - <<: *changed

    when: encrypted == 'yes'

  - block:

    - name: 'Using cleartext password: check that password not changed when using cleartext password'
      <<: *task_parameters_readonly
      postgresql_user:
        <<: *parameters
        password: "{{ db_password1 }}"
        encrypted: 'no'

    - <<: *not_changed

    - name: 'Using cleartext password: check that password changed when using another cleartext password'
      <<: *task_parameters
      postgresql_user:
        <<: *parameters
        password: "changed{{ db_password1 }}"
        encrypted: 'no'

    - <<: *changed

    when: encrypted == 'no'

  - name: Remove user
    <<: *task_parameters
    postgresql_user:
      state: 'absent'
      <<: *parameters

  - <<: *changed

  - name: Check that they were removed
    <<: *task_parameters_readonly
    shell: echo "select * from pg_user where usename='{{ db_user1 }}';" | psql -d postgres

  - assert:
      that:
        - "result.stdout_lines[-1] == '(0 rows)'"

  - name: Check that removing user a second time does nothing
    <<: *task_parameters_readonly
    postgresql_user:
      state: 'absent'
      <<: *parameters

  - <<: *not_changed