---
# Validation tasks for vault infrastructure health
# Concept: These assertions fail fast if vault prerequisites are missing or misconfigured.
#   Run as part of the main role or standalone to diagnose vault setup issues.
#   Why assert instead of conditional blocks?
#   - assert provides clear, fail-fast feedback in the Ansible log
#   - conditional blocks silently skip, hiding problems
#   - assert messages are easy to test and CI-friendly

- name: Check vault password file exists
  ansible.builtin.stat:
    path: "{{ vault_password_file }}"
  register: password_file_stat
  tags:
    - validate

# Why ansible.builtin.assert instead of shell 'test -f'?
# - assert provides human-readable failure messages
# - Multiple conditions can be checked in one task
# - Integrates with Ansible's fail_msg and exception handling
# - Shell 'test' silently passes/fails; harder to debug in logs
- name: Assert vault password file exists and has secure permissions
  ansible.builtin.assert:
    that:
      - password_file_stat.stat.exists
      - password_file_stat.stat.mode == "0600"
    fail_msg: |
      Vault password file is missing or has wrong permissions.
      Expected: {{ vault_password_file }} with mode 0600
      Actual: exists={{ password_file_stat.stat.exists }}, mode={{ password_file_stat.stat.mode | default('N/A') }}
      
      To fix:
        1. Create the file with a strong password:
           echo 'YOUR-STRONG-PASSWORD' > {{ vault_password_file }}
        2. Secure it:
           chmod 0600 {{ vault_password_file }}
      
      For interactive vault prompts (instead of password file), use:
        ansible-playbook ansible/playbooks/onboarding/setup_ansible_secrets.yml --ask-vault-pass
  when: not skip_validation | default(false)
  tags:
    - validate

- name: Check vault directory permissions
  ansible.builtin.stat:
    path: "{{ vault_base_dir }}"
  register: vault_dir_stat
  tags:
    - validate

- name: Assert vault directory has secure permissions
  ansible.builtin.assert:
    that:
      - vault_dir_stat.stat.exists
      - vault_dir_stat.stat.isdir
      - vault_dir_stat.stat.mode == "0700"
    fail_msg: |
      Vault directory has wrong permissions or does not exist.
      Expected: {{ vault_base_dir }} as directory with mode 0700
      Actual: exists={{ vault_dir_stat.stat.exists }}, isdir={{ vault_dir_stat.stat.isdir | default(false) }}, mode={{ vault_dir_stat.stat.mode | default('N/A') }}
      
      To fix:
        mkdir -p {{ vault_base_dir }}
        chmod 0700 {{ vault_base_dir }}
  when: not skip_validation | default(false)
  tags:
    - validate

- name: Check encrypted vars directory
  ansible.builtin.stat:
    path: "{{ vault_vars_dir }}"
  register: vault_vars_dir_stat
  tags:
    - validate

- name: Assert encrypted vars directory exists
  ansible.builtin.assert:
    that:
      - vault_vars_dir_stat.stat.exists
      - vault_vars_dir_stat.stat.isdir
    fail_msg: |
      Vault encrypted vars directory does not exist.
      Expected: {{ vault_vars_dir }}
      
      To fix (automatic on next role run):
        ansible-playbook playbooks/onboarding/setup_ansible_secrets.yml --tags bootstrap
  when: not skip_validation | default(false)
  tags:
    - validate

- name: Check encrypted vars file state
  ansible.builtin.stat:
    path: "{{ vault_encrypted_file }}"
  register: vault_encrypted_file_stat
  tags:
    - validate

- name: Assert encrypted vars file exists when required
  ansible.builtin.assert:
    that:
      - vault_encrypted_file_stat.stat.exists
      - vault_encrypted_file_stat.stat.isreg
    fail_msg: |
      Vault encrypted vars file is required but missing.
      Expected: {{ vault_encrypted_file }}

      To fix:
        ansible-vault create {{ vault_encrypted_file }}
  when:
    - not skip_validation | default(false)
    - vault_require_encrypted_vars_file | bool
  tags:
    - validate

- name: Read encrypted vars file header
  ansible.builtin.slurp:
    src: "{{ vault_encrypted_file }}"
  register: vault_encrypted_file_content
  when:
    - not skip_validation | default(false)
    - vault_require_encrypted_vars_file | bool
    - vault_encrypted_file_stat.stat.exists
  no_log: true
  tags:
    - validate

- name: Assert encrypted vars file is vault-encrypted
  ansible.builtin.assert:
    that:
      - "(vault_encrypted_file_content.content | b64decode).startswith('$ANSIBLE_VAULT;')"
    fail_msg: |
      Vault vars file exists but is not encrypted with Ansible Vault.
      File: {{ vault_encrypted_file }}

      To fix:
        ansible-vault encrypt {{ vault_encrypted_file }}
  when:
    - not skip_validation | default(false)
    - vault_require_encrypted_vars_file | bool
    - vault_encrypted_file_stat.stat.exists
  no_log: true
  tags:
    - validate

- name: Load encrypted vars for required key checks
  ansible.builtin.include_vars:
    file: "{{ vault_encrypted_file }}"
    name: loaded_vault_vars
  when:
    - not skip_validation | default(false)
    - vault_require_encrypted_vars_file | bool
    - vault_encrypted_file_stat.stat.exists
    - (vault_encrypted_vars_required_keys | length) > 0
  no_log: true
  tags:
    - validate

- name: Assert required encrypted keys exist
  ansible.builtin.assert:
    that:
      - "item in loaded_vault_vars"
      - "(loaded_vault_vars[item] | string | trim | length) > 0"
    fail_msg: "Missing required vault key: {{ item }}"
  loop: "{{ vault_encrypted_vars_required_keys }}"
  when:
    - not skip_validation | default(false)
    - vault_require_encrypted_vars_file | bool
    - vault_encrypted_file_stat.stat.exists
    - (vault_encrypted_vars_required_keys | length) > 0
  no_log: true
  tags:
    - validate

- name: Report validation success
  ansible.builtin.debug:
    msg: |
      ✓ Vault infrastructure is healthy.
      ✓ Vault password file: {{ vault_password_file }} (mode {{ password_file_stat.stat.mode }})
      ✓ Vault base directory: {{ vault_base_dir }} (mode {{ vault_dir_stat.stat.mode }})
      ✓ Encrypted vars directory: {{ vault_vars_dir }}
      {% if vault_require_encrypted_vars_file | bool %}✓ Encrypted vars file: {{ vault_encrypted_file }}{% endif %}
  when: not skip_validation | default(false)
  tags:
    - validate