name: Weekly release
# Tags the newest green commit on main as v<VERSION>, publishes the GitHub
# Release, and fast-forwards refs/heads/stable to it (docs/releases.md). Team
# installs follow stable, so this is the only thing that moves them. Runs
# every Monday morning Pacific; run it by hand with a ref for a hotfix, or
# with dry_run to see the plan and change nothing. A pull request that touches
# the release tooling runs the dry run against main with a read-only token,
# which is the only pre-merge exercise of the real workflow. The candidate's
# gate must already be green (free-tests and main-backstop check runs
# succeeded, every check run finished and none red, no active freeze): this
# workflow never runs tests or paid evals. Dispatch it from main: the cut job
# runs only there, with main's tooling.
on:
  schedule:
    # Monday 14:00 UTC: 07:00 PDT, 06:00 PST.
    - cron: '0 14 * * 1'
  workflow_dispatch:
    inputs:
      dry_run:
        description: 'Print the plan (candidate, tag, stable move, notes) and change nothing'
        type: boolean
        default: true
      ref:
        description: 'Hotfix: release this commit of main instead of the newest green one (full 40-hex SHA)'
        type: string
        default: ''
  pull_request:
    paths:
      - '.github/workflows/weekly-release.yml'
      - 'scripts/release-cut.ts'

# One cut at a time; a second dispatch waits for the first. A pull request's
# dry run is its own group.
concurrency:
  group: weekly-release-${{ github.event.pull_request.number || 'cut' }}
  cancel-in-progress: false

permissions: {}

jobs:
  cut:
    name: Cut the release
    if: github.event_name != 'pull_request' && github.ref == 'refs/heads/main'
    runs-on: ubuntu-24.04
    timeout-minutes: 20
    permissions:
      # The tag, the stable branch and the release.
      contents: write
      # Reads the candidate's check runs.
      checks: read
    steps:
      # The dispatched ref supplies the tooling; the release candidate always
      # comes from origin/main, which fetch-depth 0 brings along with every
      # branch.
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
        with:
          fetch-depth: 0

      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
        with:
          bun-version: 1.4.2

      - name: Fetch stable and the tags
        run: |
          set -euo pipefail
          git fetch --quiet origin '+refs/heads/stable:refs/remotes/origin/stable' 2>/dev/null || echo "origin has no stable yet: this cut creates it"
          git fetch --quiet --tags origin
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"

      - name: Plan and cut
        env:
          GH_TOKEN: ${{ github.token }}
          DRY_RUN: ${{ github.event_name == 'workflow_dispatch' && inputs.dry_run && 'true' || 'false' }}
          RELEASE_REF: ${{ github.event_name == 'workflow_dispatch' && inputs.ref || '' }}
        run: |
          set -euo pipefail
          if [ -n "$RELEASE_REF" ] && ! [[ "$RELEASE_REF" =~ ^[0-9a-f]{40}$ ]]; then
            echo "::error::ref must be the full 40-hex SHA of a commit on main, not '$RELEASE_REF'"
            exit 1
          fi
          args=(--repo "$GITHUB_REPOSITORY" --summary "$GITHUB_STEP_SUMMARY")
          [ "$DRY_RUN" = true ] && args+=(--dry-run)
          [ -n "$RELEASE_REF" ] && args+=(--ref "$RELEASE_REF")
          echo "## Weekly release ($([ "$DRY_RUN" = true ] && echo 'dry run' || echo 'cut'))" >> "$GITHUB_STEP_SUMMARY"
          bun --no-env-file --config=/dev/null --no-install run scripts/release-cut.ts "${args[@]}"

  dry-run:
    name: Dry run against main
    if: github.event_name == 'pull_request'
    runs-on: ubuntu-24.04
    timeout-minutes: 20
    permissions:
      contents: read
      checks: read
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
        with:
          fetch-depth: 0
          persist-credentials: false

      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
        with:
          bun-version: 1.4.2

      - name: Plan only
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail
          git fetch --quiet origin '+refs/heads/stable:refs/remotes/origin/stable' 2>/dev/null || echo "origin has no stable yet"
          git fetch --quiet --tags origin
          echo "## Weekly release (dry run from PR #${{ github.event.pull_request.number }})" >> "$GITHUB_STEP_SUMMARY"
          bun --no-env-file --config=/dev/null --no-install run scripts/release-cut.ts --repo "$GITHUB_REPOSITORY" --summary "$GITHUB_STEP_SUMMARY" --dry-run