name: Build & Push Multi-Arch Image

on:
  push:
    branches: [main]
    tags:
      - "v*.*.*"          # Triggers on version tags like v1.0.0
  workflow_dispatch:       # Allow manual trigger from GitHub UI

env:
  IMAGE_NAME: ${{ secrets.DOCKERHUB_USERNAME }}/ost2pst

jobs:
  build-and-push:
    runs-on: ubuntu-latest

    steps:
      # ── Checkout source ─────────────────────────────────────────────────────
      - name: Checkout
        uses: actions/checkout@v4

      # ── Set up QEMU (required for ARM64 emulation on GitHub runners) ────────
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      # ── Set up Buildx (multi-arch builder) ──────────────────────────────────
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      # ── Log in to Docker Hub ─────────────────────────────────────────────────
      - name: Log in to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      # ── Determine image tags ─────────────────────────────────────────────────
      - name: Extract metadata (tags, labels)
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.IMAGE_NAME }}
          tags: |
            # Push :latest on every main branch commit
            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/main' }}
            # Push semver tags: v1.2.3 → 1.2.3, 1.2, 1
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            # Always tag with the short commit SHA
            type=sha,prefix=sha-

      # ── Build & push for linux/amd64 + linux/arm64 ──────────────────────────
      - name: Build and push
        uses: docker/build-push-action@v5
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          # Layer caching via GitHub Actions cache — speeds up subsequent builds
          cache-from: type=gha
          cache-to: type=gha,mode=max