name: Publish Docker image to Docker Hub

on:
  push:
    tags:
      - 'v*'
  workflow_dispatch:

jobs:
  prepare:
    name: Prepare metadata
    runs-on: ubuntu-latest
    permissions:
      contents: read
    outputs:
      version: ${{ steps.notes.outputs.version }}
      desc: ${{ steps.notes.outputs.desc }}
      tags: ${{ steps.meta.outputs.tags }}
      labels: ${{ steps.meta.outputs.labels }}
    steps:
      - name: Checkout
        uses: actions/checkout@v5.0.0

      - name: Prepare release notes from template
        id: notes
        shell: bash
        run: |
          VERSION_REF="${GITHUB_REF##*/}"  # e.g. v1.2.3
          TEMPLATE="RELEASE_NOTES_TEMPLATE.md"
          if [ -f "$TEMPLATE" ]; then
            sed "s/\${VERSION}/${VERSION_REF}/g" "$TEMPLATE" > RELEASE_NOTES.md
          else
            echo "# MTG Python Deckbuilder ${VERSION_REF}" > RELEASE_NOTES.md
            echo >> RELEASE_NOTES.md
            echo "Automated release." >> RELEASE_NOTES.md
          fi
          DESC=$(awk 'BEGIN{ORS="\\n"} {print}' RELEASE_NOTES.md)
          echo "desc=$DESC" >> $GITHUB_OUTPUT
          echo "version=$VERSION_REF" >> $GITHUB_OUTPUT

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5.8.0
        with:
          images: |
            mwisnowski/mtg-python-deckbuilder
          tags: |
            type=semver,pattern={{version}}
            type=raw,value=latest
          labels: |
            org.opencontainers.image.title=MTG Python Deckbuilder
            org.opencontainers.image.version=${{ github.ref_name }}
            org.opencontainers.image.description=${{ steps.notes.outputs.desc }}
            org.opencontainers.image.revision=${{ github.sha }}

  build_amd64:
    name: Build (amd64)
    runs-on: ubuntu-latest
    needs: prepare
    permissions:
      contents: read
    outputs:
      digest: ${{ steps.build.outputs.digest }}
    steps:
      - name: Checkout
        uses: actions/checkout@v5.0.0

      - name: Prepare amd64 tag list
        id: arch_tags
        shell: bash
        run: |
          echo "Generating amd64 tag variants" >&2
          TAGS='${{ needs.prepare.outputs.tags }}'
          # Exclude 'latest' so we don't leave latest-amd64 dangling; only final manifest will produce plain 'latest'
          echo "$TAGS" | grep -v ':latest$' | sed 's/$/-amd64/' | grep . > tags.txt
          echo "Computed tags:" >&2; cat tags.txt >&2
          echo "tags<<EOF" >> $GITHUB_OUTPUT
          cat tags.txt >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT

      - name: Docker Hub login
        uses: docker/login-action@v3.5.0
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3.11.1

      - name: Smoke test Web UI (local build)
        shell: bash
        env:
          APP_VERSION: ${{ needs.prepare.outputs.version }}
        run: |
          docker buildx build --platform linux/amd64 --load -t mtg-deckbuilder:test --build-arg APP_VERSION=$APP_VERSION .
          docker rm -f mtg-smoke 2>/dev/null || true
          docker run -d --name mtg-smoke -p 8080:8080 mtg-deckbuilder:test
          echo "Waiting for Web UI (amd64)..."
          for i in {1..30}; do
            if curl -fsS http://localhost:8080/ >/dev/null; then echo "Up"; break; fi
            sleep 2
          done
          if ! curl -fsS http://localhost:8080/ >/dev/null; then
            echo "Web UI did not start in time. Logs:" && docker logs mtg-smoke || true
            exit 1
          fi
          docker rm -f mtg-smoke >/dev/null 2>&1 || true

      - name: Build & push arch image (amd64)
        id: build
        uses: docker/build-push-action@v6.18.0
        with:
          context: .
          file: ./Dockerfile
          push: true
          platforms: linux/amd64
          tags: ${{ steps.arch_tags.outputs.tags }}
          labels: ${{ needs.prepare.outputs.labels }}
          build-args: |
            APP_VERSION=${{ needs.prepare.outputs.version }}

  build_arm64:
    name: Build (arm64)
    runs-on: ubuntu-latest
    needs: prepare
    permissions:
      contents: read
    steps:
      - name: Checkout
        uses: actions/checkout@v5.0.0

      - name: Prepare arm64 tag list (fallback)
        id: arch_tags
        shell: bash
        run: |
          echo "Generating arm64 tag variants (fallback)" >&2
          TAGS='${{ needs.prepare.outputs.tags }}'
          # Exclude 'latest' so only final manifest produces plain 'latest'
          echo "$TAGS" | grep -v ':latest$' | sed 's/$/-arm64/' | grep . > tags.txt
          echo "tags<<EOF" >> $GITHUB_OUTPUT
          cat tags.txt >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT

      - name: Docker Hub login
        uses: docker/login-action@v3.5.0
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Set up QEMU (for emulation)
        uses: docker/setup-qemu-action@v3.6.0

      - name: Set up Buildx
        uses: docker/setup-buildx-action@v3.11.1

      - name: Build & push arch image (arm64 emulated)
        uses: docker/build-push-action@v6.18.0
        with:
          context: .
          file: ./Dockerfile
          push: true
          platforms: linux/arm64
          tags: ${{ steps.arch_tags.outputs.tags }}
          labels: ${{ needs.prepare.outputs.labels }}
          build-args: |
            APP_VERSION=${{ needs.prepare.outputs.version }}

  manifest:
    name: Create multi-arch manifests
    runs-on: ubuntu-latest
    needs: [prepare, build_amd64, build_arm64]
    steps:
      - name: Docker Hub login
        uses: docker/login-action@v3.5.0
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Create & push manifests
        shell: bash
        env:
          TAGS: ${{ needs.prepare.outputs.tags }}
        run: |
          echo "Creating multi-arch manifests (amd64 + arm64)..."
          VERSION_PRIMARY=$(echo "$TAGS" | grep -v ':latest$' | head -n1)
          echo "$TAGS" | while read -r tag; do
            [ -z "$tag" ] && continue
            echo "Processing $tag"
            # For 'latest', reuse the version tag's arch images (we did not push latest-amd64/-arm64)
            if [[ "$tag" == *":latest" ]]; then
              BASE="$VERSION_PRIMARY"
            else
              BASE="$tag"
            fi
            SOURCES="${BASE}-amd64"
            if docker buildx imagetools inspect "${BASE}-arm64" >/dev/null 2>&1; then
              echo "Found arm64 image tag: ${BASE}-arm64"
              SOURCES="$SOURCES ${BASE}-arm64"
            else
              echo "No arm64 image found for $tag (skipping arm64 in manifest)" >&2
            fi
            docker buildx imagetools create -t "$tag" $SOURCES
          done
          echo "Done."

      - name: Inspect primary tag
        run: |
          FIRST=$(echo "$TAGS" | head -n1)
          docker buildx imagetools inspect "$FIRST"