name: Release Fast-Path

# Issue #1677: re-tag :edge as :vX.Y.Z when the tag SHA matches :edge's
# org.opencontainers.image.revision label. Skips ~30 min of Go test +
# Playwright + Docker rebuild because the bytes are identical — only the
# manifest name changes. Falls back to deploy.yml when SHAs differ so
# tags on older commits still go through full validation.
#
# This workflow is the SOLE consumer of push.tags. deploy.yml's tag
# trigger has been removed to prevent double-fire.

on:
  push:
    tags: ['v[0-9]+.[0-9]+.[0-9]+']

permissions:
  contents: read
  packages: write
  actions: write   # issue #1702: required so the fallback `gh workflow run deploy.yml` dispatch is allowed

concurrency:
  group: release-fast-path-${{ github.ref }}
  cancel-in-progress: false

jobs:
  retag-or-fallback:
    name: "🏷️ Re-tag :edge → :vX.Y.Z (fast) or dispatch deploy.yml (fallback)"
    runs-on: ubuntu-latest
    steps:
      - name: Log in to GHCR
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Install crane
        uses: imjasonh/setup-crane@v0.4

      - name: Parse semver from tag
        id: semver
        run: |
          set -euo pipefail
          TAG="${GITHUB_REF#refs/tags/}"
          # Expect vMAJOR.MINOR.PATCH (workflow trigger already enforces this).
          if [[ ! "$TAG" =~ ^v([0-9]+)\.([0-9]+)\.([0-9]+)$ ]]; then
            echo "Tag $TAG does not match vMAJOR.MINOR.PATCH" >&2
            exit 1
          fi
          MAJOR="${BASH_REMATCH[1]}"
          MINOR="${BASH_REMATCH[2]}"
          {
            echo "tag=$TAG"
            echo "vMajor=v$MAJOR"
            echo "vMajorMinor=v$MAJOR.$MINOR"
          } >> "$GITHUB_OUTPUT"
          echo "Parsed: $TAG → v$MAJOR / v$MAJOR.$MINOR / $TAG"

      - name: Inspect :edge revision label
        id: edge
        run: |
          set -euo pipefail
          IMAGE="ghcr.io/kpa-clawbot/corescope"
          EDGE_REF="${IMAGE}:edge"
          # crane config returns the OCI image config JSON; the revision label
          # is set by docker/metadata-action on the master-edge build.
          # If :edge doesn't exist yet (first run on a fresh registry), fall
          # through to the slow path.
          if ! CONFIG="$(crane config "$EDGE_REF" 2>/dev/null)"; then
            echo "edge_revision=" >> "$GITHUB_OUTPUT"
            echo "no_edge=true"   >> "$GITHUB_OUTPUT"
            echo ":edge not found in registry — will use fallback path"
            exit 0
          fi
          REV="$(echo "$CONFIG" | jq -r '.config.Labels["org.opencontainers.image.revision"] // ""')"
          echo "edge_revision=$REV" >> "$GITHUB_OUTPUT"
          echo "no_edge=false"      >> "$GITHUB_OUTPUT"
          echo ":edge org.opencontainers.image.revision = $REV"
          echo "tag SHA (github.sha)               = ${{ github.sha }}"

      # ─────────── FAST PATH: SHAs match, metadata-only retag ───────────
      - name: Re-tag :edge → :vX.Y.Z + :vX.Y + :vX + :latest (fast path)
        if: steps.edge.outputs.no_edge == 'false' && steps.edge.outputs.edge_revision == github.sha
        run: |
          set -euo pipefail
          IMAGE="ghcr.io/kpa-clawbot/corescope"
          SRC="${IMAGE}:edge"
          echo "SHA match — fast-path re-tag from $SRC"
          for NEW_TAG in \
              "${{ steps.semver.outputs.tag }}" \
              "${{ steps.semver.outputs.vMajorMinor }}" \
              "${{ steps.semver.outputs.vMajor }}" \
              "latest"; do
            echo "  crane tag $SRC $NEW_TAG"
            crane tag "$SRC" "$NEW_TAG"
          done
          echo "Fast-path complete — all tags point at the :edge manifest digest."

      # ─────────── FALLBACK: SHAs differ, run the full pipeline ───────────
      - name: Dispatch full deploy.yml pipeline (fallback)
        if: steps.edge.outputs.no_edge == 'true' || steps.edge.outputs.edge_revision != github.sha
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          set -euo pipefail
          echo "SHA mismatch (or no :edge) — falling back to full pipeline"
          echo "  :edge revision = '${{ steps.edge.outputs.edge_revision }}'"
          echo "  tag SHA        = '${{ github.sha }}'"
          gh workflow run deploy.yml \
            --repo "${{ github.repository }}" \
            --ref "${{ github.ref }}"
          echo "Dispatched deploy.yml against ${{ github.ref }}"