name: Prepare release
on:
  workflow_call:
    outputs:
      version:
        description: "The version that is being released."
        value: ${{ jobs.prepare.outputs.version }}
      major_version:
        description: "The major version of the release."
        value: ${{ jobs.prepare.outputs.major_version }}
      latest_tag:
        description: "The most recent, existing release tag."
        value: ${{ jobs.prepare.outputs.latest_tag }}
      backport_source_branch:
        description: "The release branch for the given tag."
        value: ${{ jobs.prepare.outputs.backport_source_branch }}
      backport_target_branches:
        description: "JSON encoded list of branches to target with backports."
        value: ${{ jobs.prepare.outputs.backport_target_branches }}

  push:
    paths:
      - .github/workflows/prepare-release.yml

defaults:
  run:
    shell: bash

jobs:
  prepare:
    name: "Prepare release"
    runs-on: ubuntu-slim
    if: github.repository == 'github/codeql-action'

    permissions:
      contents: read

    outputs:
      version: ${{ steps.versions.outputs.version }}
      major_version: ${{ steps.versions.outputs.major_version }}
      latest_tag: ${{ steps.versions.outputs.latest_tag }}
      backport_source_branch: ${{ steps.branches.outputs.backport_source_branch }}
      backport_target_branches: ${{ steps.branches.outputs.backport_target_branches }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@v5
        with:
          fetch-depth: 0 # Need full history for calculation of diffs

      - name: Configure runner for release
        uses: ./.github/actions/release-initialise

      - name: Get version tags
        id: versions
        run: |
          VERSION="v$(jq '.version' -r 'package.json')"
          echo "version=${VERSION}" >> $GITHUB_OUTPUT
          MAJOR_VERSION=$(cut -d '.' -f1 <<< "${VERSION}")
          echo "major_version=${MAJOR_VERSION}" >> $GITHUB_OUTPUT
          LATEST_TAG=$(git tag --sort=-v:refname | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+' | head -1)
          echo "latest_tag=${LATEST_TAG}" >> $GITHUB_OUTPUT

      - name: Determine older release branches
        id: branches
        uses: ./.github/actions/release-branches
        with:
          major_version: ${{ steps.versions.outputs.major_version }}
          latest_tag: ${{ steps.versions.outputs.latest_tag }}

      - name: Print release information
        run: |
          echo 'version: ${{ steps.versions.outputs.version }}'
          echo 'major_version: ${{ steps.versions.outputs.major_version }}'
          echo 'latest_tag: ${{ steps.versions.outputs.latest_tag }}'
          echo 'backport_source_branch: ${{ steps.branches.outputs.backport_source_branch }}'
          echo 'backport_target_branches: ${{ steps.branches.outputs.backport_target_branches }}'