# SPDX-FileCopyrightText: 2026 Slavi Pantaleev
#
# SPDX-License-Identifier: AGPL-3.0-or-later

---
name: Molecule

# Unlike the MASH role repositories, where one repository holds one role, every
# role here lives in the same repository. Running every scenario on every push
# would be unaffordable, so a first job works out which roles the push actually
# touched and the matrix is built from that. A push that changes documentation,
# or a role with no scenario yet, runs nothing at all.
on:  # yamllint disable-line rule:truthy
  push:
    paths:
      - "roles/custom/**"
      - ".github/workflows/molecule.yml"
  pull_request:
    paths:
      - "roles/custom/**"
      - ".github/workflows/molecule.yml"
  workflow_dispatch:
    inputs:
      role:
        description: "Single role to test (directory name under roles/custom), or empty for all roles that have a scenario"
        required: false
        type: string

permissions:
  contents: read

jobs:
  detect:
    name: Work out which roles to test
    runs-on: ubuntu-latest

    # Same rule as the MASH repositories: a pull request from a branch of this
    # repository would otherwise run everything twice, once for the push and
    # once for the pull request.
    if: >-
      github.event_name != 'pull_request'
      || github.event.pull_request.head.repo.full_name != github.repository

    outputs:
      roles: ${{ steps.detect.outputs.roles }}

    steps:
      - name: Check out
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
        with:
          fetch-depth: 0

      - name: Detect roles with a Molecule scenario that this change touches
        id: detect
        env:
          EVENT_NAME: ${{ github.event_name }}
          BASE_SHA: ${{ github.event.pull_request.base.sha }}
          BEFORE_SHA: ${{ github.event.before }}
          INPUT_ROLE: ${{ inputs.role }}
        run: |
          set -euo pipefail

          have_scenario() {
            [ -f "roles/custom/$1/molecule/default/molecule.yml" ]
          }

          # An explicit request through workflow_dispatch wins over detection.
          if [ -n "${INPUT_ROLE}" ]; then
            if have_scenario "${INPUT_ROLE}"; then
              printf 'roles=["%s"]\n' "${INPUT_ROLE}" >> "$GITHUB_OUTPUT"
            else
              echo "No scenario at roles/custom/${INPUT_ROLE}/molecule/default" >&2
              exit 1
            fi
            exit 0
          fi

          # A hand-triggered run with no role named, and any run where the diff
          # base is unusable (a new branch, a force push, the very first commit),
          # falls back to every role that has a scenario. That is the safe
          # direction to fail in: too much testing rather than too little.
          base=""
          case "${EVENT_NAME}" in
            pull_request) base="${BASE_SHA}" ;;
            push)
              if [ -n "${BEFORE_SHA}" ] && [ "${BEFORE_SHA}" != "0000000000000000000000000000000000000000" ] \
                 && git cat-file -e "${BEFORE_SHA}^{commit}" 2>/dev/null; then
                base="${BEFORE_SHA}"
              fi
              ;;
          esac

          if [ -n "${base}" ]; then
            changed="$(git diff --name-only "${base}" HEAD -- 'roles/custom/*' || true)"
            candidates="$(printf '%s\n' "${changed}" | awk -F/ 'NF>2 {print $3}' | sort -u)"
            echo "Changed roles: ${candidates:-none}"
          else
            candidates="$(find roles/custom -mindepth 1 -maxdepth 1 -type d -printf '%f\n' | sort)"
            echo "No usable diff base; considering every role"
          fi

          selected=""
          for role in ${candidates}; do
            if have_scenario "${role}"; then
              selected="${selected} ${role}"
            fi
          done

          if [ -z "${selected}" ]; then
            echo "Nothing to test"
            echo 'roles=[]' >> "$GITHUB_OUTPUT"
            exit 0
          fi

          echo "Testing:${selected}"
          json="$(printf '%s\n' ${selected} | jq -R . | jq -c -s .)"
          echo "roles=${json}" >> "$GITHUB_OUTPUT"

  molecule:
    name: "Molecule: ${{ matrix.role }}"
    runs-on: ubuntu-latest

    needs: detect
    if: needs.detect.outputs.roles != '[]'

    strategy:
      matrix:
        role: ${{ fromJson(needs.detect.outputs.roles) }}
      fail-fast: false

    env:
      MOLECULE_DISTRO: ubuntu2604
      PY_COLORS: "1"
      ANSIBLE_FORCE_COLOR: "1"

    steps:
      - name: Check out
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7

      - name: Set up Python
        uses: actions/setup-python@v6
        with:
          python-version: "3.x"

      - name: Install test dependencies
        run: python3 -m pip install -r roles/custom/${{ matrix.role }}/molecule/requirements.txt

      - name: Run Molecule
        working-directory: roles/custom/${{ matrix.role }}
        run: molecule test --scenario-name default