name: Sync VERSION from desktop release

# Updates the VERSION file in this repo whenever feedBack-desktop
# publishes a new tagged release. feedBack-desktop's build.yml
# dispatches the `desktop-released` event at the end of a successful
# tag build (see docs in CLAUDE.md). A `workflow_dispatch` trigger is
# kept for manual testing / recovery.
#
# Related issue: #81.

on:
  repository_dispatch:
    types: [desktop-released]
  workflow_dispatch:
    inputs:
      version:
        description: 'Version to sync (vX.Y.Z or X.Y.Z)'
        required: true

permissions:
  contents: write

# Serialize runs so a rapid-fire pair of dispatches can't produce a
# non-fast-forward push race. Later runs queue behind earlier ones.
concurrency:
  group: sync-version
  cancel-in-progress: false

jobs:
  sync:
    runs-on: ubuntu-latest
    steps:
      # Always operate on main regardless of trigger branch. repository_dispatch
      # already runs against the default branch, but workflow_dispatch can be
      # launched from any branch in the UI — pinning ref: main keeps both
      # paths committing to the same place.
      - uses: actions/checkout@v4
        with:
          ref: main

      - name: Determine target version
        id: v
        # Pass untrusted payloads through env vars instead of ${{ }}
        # expansion inside the shell body — inline expansion makes the
        # script vulnerable to command injection if a dispatch client
        # sent a value like `$(...)` or a quote break.
        env:
          RAW_DISPATCH: ${{ github.event.client_payload.version }}
          RAW_INPUT: ${{ inputs.version }}
          EVENT_NAME: ${{ github.event_name }}
        run: |
          if [ "$EVENT_NAME" = "workflow_dispatch" ]; then
            raw="$RAW_INPUT"
          else
            raw="$RAW_DISPATCH"
          fi
          # Accept both "vX.Y.Z" and "X.Y.Z" on the wire.
          version="${raw#v}"
          # Anchored semver guard — rejects payloads like
          # "soundfonts-v1" (seen in the desktop release list) or any
          # stray text. The emitter side validates too, but we don't
          # trust cross-repo inputs.
          if ! [[ "$version" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
            echo "::error::Invalid version payload: '$raw'"
            exit 1
          fi
          echo "version=$version" >> "$GITHUB_OUTPUT"

      - name: Compare with current VERSION
        id: cmp
        env:
          TARGET: ${{ steps.v.outputs.version }}
        run: |
          current=$(tr -d '[:space:]' < VERSION)
          if [ "$current" = "$TARGET" ]; then
            echo "No change (already at $current)."
            echo "changed=false" >> "$GITHUB_OUTPUT"
          else
            echo "Bumping $current -> $TARGET."
            echo "changed=true" >> "$GITHUB_OUTPUT"
            echo "previous=$current" >> "$GITHUB_OUTPUT"
          fi

      - name: Commit and push
        if: steps.cmp.outputs.changed == 'true'
        env:
          TARGET: ${{ steps.v.outputs.version }}
        run: |
          printf '%s\n' "$TARGET" > VERSION
          git config user.name  'github-actions[bot]'
          git config user.email 'github-actions[bot]@users.noreply.github.com'
          git add VERSION
          git commit -m "chore: sync VERSION to $TARGET (desktop release)"
          # Explicit HEAD:main push — if workflow_dispatch was somehow
          # launched with ref: main overridden in the UI, this still
          # lands on main rather than pushing to whatever the tracking
          # branch was.
          git push origin HEAD:main