name: Version Bump on Release

on:
  # Fired by the App Store Connect webhook relay (a Cloudflare Worker) when the
  # iOS app version state becomes READY_FOR_DISTRIBUTION. The Worker POSTs a
  # repository_dispatch with event_type "asc-app-released".
  repository_dispatch:
    types: [asc-app-released]
  # Allow manual runs for testing the bump/PR flow without a real release.
  workflow_dispatch:

# Serialize runs: Apple delivers the release webhook at least once, so two
# near-simultaneous deliveries could otherwise race the dedup check against
# branch creation. A single concurrency group forces them to run one at a time.
concurrency:
  group: version-bump-on-release
  cancel-in-progress: false

# Least privilege: we only need to push a branch (contents) and open a PR.
permissions:
  contents: write
  pull-requests: write

jobs:
  version-bump:
    if: github.repository == 'bluesky-social/social-app'
    name: 🔖 Open version-bump PR
    runs-on: ubuntu-latest
    steps:
      - name: ⬇️ Checkout main
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          # repository_dispatch always runs on the default branch, but pin it
          # explicitly so a manual workflow_dispatch from another ref still
          # bumps from main.
          ref: main

      - name: 🪛 Setup jq
        uses: dcarbone/install-jq-action@b7ef57d46ece78760b4019dbc4080a1ba2a40b45 # v3.2.0

      - name: 🧮 Compute next version
        id: version
        run: |
          # Release convention: package.json "version" is the version that just
          # shipped; the next release is the next minor with patch reset.
          CURRENT="$(jq -r '.version' package.json)"
          NEXT="$(echo "$CURRENT" | jq -R -r 'split(".") | "\(.[0]).\(.[1] | tonumber + 1).0"')"
          echo "Current version: $CURRENT"
          echo "Next version: $NEXT"
          echo "current=$CURRENT" >> "$GITHUB_OUTPUT"
          echo "next=$NEXT" >> "$GITHUB_OUTPUT"
          echo "branch=bot/version-bump-$NEXT" >> "$GITHUB_OUTPUT"

      - name: 🔁 Skip if PR already open
        id: dedup
        # Apple may deliver the release webhook more than once. The branch name
        # encodes the target version, so an existing open PR for that head means
        # a previous delivery already handled this release - exit cleanly.
        env:
          GH_TOKEN: ${{ github.token }}
          BRANCH: ${{ steps.version.outputs.branch }}
        run: |
          EXISTING="$(gh pr list --state open --head "$BRANCH" --json number --jq 'length')"
          if [ "$EXISTING" != "0" ]; then
            echo "An open PR for $BRANCH already exists; nothing to do."
            echo "skip=true" >> "$GITHUB_OUTPUT"
          else
            echo "skip=false" >> "$GITHUB_OUTPUT"
          fi

      - name: ✏️ Bump version in package.json
        if: steps.dedup.outputs.skip == 'false'
        env:
          NEXT: ${{ steps.version.outputs.next }}
        run: |
          # jq --indent 2 matches the file's existing 2-space indentation, so
          # the write-back only touches the "version" line. Verify that.
          jq --indent 2 --arg v "$NEXT" '.version = $v' package.json > package.json.tmp
          mv package.json.tmp package.json
          # Abort if anything other than the single version line changed. numstat
          # reports "<added>\t<removed>" per file; a clean bump is exactly one line
          # added and one removed, so any jq reformatting elsewhere trips this.
          CHANGED="$(git diff --numstat package.json | awk '{print $1"+"$2}')"
          if [ "$CHANGED" != "1+1" ]; then
            echo "Unexpected diff in package.json (expected exactly one changed line):"
            git diff package.json
            exit 1
          fi

      - name: 📤 Create branch, commit and open PR
        if: steps.dedup.outputs.skip == 'false'
        env:
          GH_TOKEN: ${{ github.token }}
          NEXT: ${{ steps.version.outputs.next }}
          CURRENT: ${{ steps.version.outputs.current }}
          BRANCH: ${{ steps.version.outputs.branch }}
          NEW_STATE: ${{ github.event.client_payload.newState }}
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git checkout -b "$BRANCH"
          git add package.json
          git commit -m "bump version to $NEXT"
          git push --set-upstream origin "$BRANCH"
          # NOTE: creating a PR with the default GITHUB_TOKEN requires the org/repo
          # setting "Allow GitHub Actions to create and approve pull requests" to
          # be enabled (Settings > Actions > General). If it is off, this step
          # fails with "GitHub Actions is not permitted to create or approve pull
          # requests" - enable that setting rather than adding a PAT secret.
          gh pr create \
            --base main \
            --head "$BRANCH" \
            --title "bump version to $NEXT" \
            --body "$(cat <<EOF
          Automated version bump.

          Triggered by the App Store Connect release webhook (\`asc-app-released\`, newState: \`${NEW_STATE:-manual dispatch}\`), which fires when the iOS app reaches \`READY_FOR_DISTRIBUTION\`.

          - Released version: \`$CURRENT\`
          - New version: \`$NEXT\`

          This bumps the minor version and resets the patch, per the release convention. The version flows into \`app.config.js\` (Expo version + OTA \`runtimeVersion\` appVersion policy).
          EOF
          )"