---
# Controller-side analysis. Runs on localhost over the artifact directory, so it is
# independent of whether any surveyed node is still alive — and so it can be re-run on
# its own (`--tags analyse`) without touching hardware.
#
# The statistics live in files/memattr_analyse.py, not in Jinja: Clopper-Pearson and
# Fisher belong somewhere testable, and a confidence interval assembled out of template
# filters is a confidence interval nobody will ever check.

- name: Locate the survey artifacts
  ansible.builtin.find:
    paths: "{{ memattr_survey_artifact_dir }}"
    patterns: "*.boots.json"
  register: memattr_survey_artifacts

- name: Report that there is nothing to analyse
  ansible.builtin.debug:
    msg: >-
      No *.boots.json under {{ memattr_survey_artifact_dir }} — no survey has produced a
      harvest yet. Run the playbook with -e memattr_survey_reboots_authorised=true.
  when: memattr_survey_artifacts.matched | int == 0

- name: Analyse the survey
  ansible.builtin.command:
    argv:
      - /usr/bin/env
      - python3
      - "{{ role_path }}/files/memattr_analyse.py"
      - "--artifact-dir"
      - "{{ memattr_survey_artifact_dir }}"
      - "--rounds"
      - "{{ memattr_survey_rounds }}"
      - "--out"
      - "{{ memattr_survey_artifact_dir }}/summary.md"
  register: memattr_survey_analysis
  changed_when: false
  when: memattr_survey_artifacts.matched | int > 0

- name: Show the analysis
  ansible.builtin.debug:
    msg: "{{ memattr_survey_analysis.stdout.split('\n') }}"
  when: memattr_survey_analysis is not skipped