name: Docker

# This workflow uses actions that are not certified by GitHub.
# They are provided by a third-party and are governed by
# separate terms of service, privacy policy, and support
# documentation.

on:
  push:
    # Only trigger on tags (releases), not main branch pushes
    # Main branch builds are handled by workflow_run after Translate completes
    tags: ["v*.*.*"]
  pull_request:
    branches: ["main"]
  workflow_run:
    workflows: ["Translate"]
    types: [completed]
    branches: [main]
    # Docker builds after Translate completes (success or failure)
    # This ensures Docker always has the latest translations

env:
  # Use docker.io for Docker Hub if empty
  REGISTRY: ghcr.io
  # github.repository as <account>/<repo>
  IMAGE_NAME: ${{ github.repository }}
  MIGRATE_IMAGE_NAME: ${{ github.repository }}-migrate

jobs:
  build:
    concurrency:
      group: docker-build-${{ github.ref }}
      cancel-in-progress: true
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      # This is used to complete the identity challenge
      # with sigstore/fulcio when running outside of PRs.
      id-token: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      # Install the cosign tool except on PR
      # https://github.com/sigstore/cosign-installer
      - name: Install cosign
        if: github.event_name != 'pull_request'
        uses: sigstore/cosign-installer@59acb6260d9c0ba8f4a2f9d9b48431a222b68e20 #v3.5.0
        with:
          cosign-release: "v2.2.4"

      # Set up BuildKit Docker container builder to be able to build
      # multi-platform images and export cache
      # https://github.com/docker/setup-buildx-action
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0

      # Login against a Docker registry except on PR
      # https://github.com/docker/login-action
      - name: Log into registry ${{ env.REGISTRY }}
        if: github.event_name != 'pull_request'
        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Extract metadata (tags, labels) for Docker
      # https://github.com/docker/metadata-action
      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@96383f45573cb7f253c731d3b3ab81c87ef81934 # v5.0.0
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            type=raw,value=latest,enable=${{ github.ref_type == 'tag' }}
            type=raw,value=edge,enable={{is_default_branch}}

      - name: Extract Docker metadata (migrate)
        id: meta-migrate
        uses: docker/metadata-action@96383f45573cb7f253c731d3b3ab81c87ef81934 # v5.0.0
        with:
          images: ${{ env.REGISTRY }}/${{ env.MIGRATE_IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            type=raw,value=latest,enable=${{ github.ref_type == 'tag' }}
            type=raw,value=edge,enable={{is_default_branch}}

      # Extract version from git tag or ref
      # Uses git describe to get latest tag + commit hash in SemVer format: 1.2.3+abc1234
      - name: Extract version
        id: version
        run: |
          if [[ "${{ github.ref_type }}" == "tag" ]]; then
            VERSION="${{ github.ref_name }}"
            # Remove 'v' prefix if present
            VERSION="${VERSION#v}"
          else
            # Use git describe and simplify: v1.2.3-5-gabc1234 -> 1.2.3+abc1234
            GIT_DESCRIBE=$(git describe --tags --always --long 2>/dev/null || echo "")
            if [[ -n "$GIT_DESCRIBE" ]]; then
              # Match pattern: v1.2.3-5-gabc1234 (tag-commits-gcommit)
              if [[ "$GIT_DESCRIBE" =~ ^v?([0-9]+\.[0-9]+\.[0-9]+)-[0-9]+-g([a-f0-9]+)$ ]]; then
                # Format as tag+commit (SemVer build metadata)
                TAG_VERSION="${BASH_REMATCH[1]}"
                COMMIT_HASH="${BASH_REMATCH[2]}"
                VERSION="${TAG_VERSION}+${COMMIT_HASH:0:7}"
              elif [[ "$GIT_DESCRIBE" =~ ^v?([0-9]+\.[0-9]+\.[0-9]+)$ ]]; then
                # Exactly on a tag
                VERSION="${BASH_REMATCH[1]}"
              else
                # Fallback: just commit hash
                COMMIT_SHA="${{ github.sha }}"
                VERSION="${COMMIT_SHA:0:7}"
              fi
            else
              # No tags exist, use commit hash
              COMMIT_SHA="${{ github.sha }}"
              VERSION="${COMMIT_SHA:0:7}"
            fi
          fi
          echo "version=$VERSION" >> $GITHUB_OUTPUT
          echo "Version: $VERSION"

      # Build and push Docker image with Buildx (don't push on PR)
      # https://github.com/docker/build-push-action
      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@0565240e2d4ab88bba5387d719585280857ece09 # v5.0.0
        with:
          context: .
          file: apps/web/Dockerfile
          push: ${{ github.event_name != 'pull_request' }}
          platforms: linux/amd64,linux/arm64
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          build-args: |
            APP_VERSION=${{ steps.version.outputs.version }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Build and push migrate Docker image
        id: build-and-push-migrate
        uses: docker/build-push-action@0565240e2d4ab88bba5387d719585280857ece09 # v5.0.0
        with:
          context: .
          file: apps/web/Dockerfile
          target: migrate
          push: ${{ github.event_name != 'pull_request' }}
          platforms: linux/amd64,linux/arm64
          tags: ${{ steps.meta-migrate.outputs.tags }}
          labels: ${{ steps.meta-migrate.outputs.labels }}
          build-args: |
            APP_VERSION=${{ steps.version.outputs.version }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      # Sign the resulting Docker image digest except on PRs.
      # This will only write to the public Rekor transparency log when the Docker
      # repository is public to avoid leaking data.  If you would like to publish
      # transparency data even for private images, pass --force to cosign below.
      # https://github.com/sigstore/cosign
      - name: Sign the published Docker image
        if: ${{ github.event_name != 'pull_request' }}
        env:
          # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
          TAGS: ${{ steps.meta.outputs.tags }}
          DIGEST: ${{ steps.build-and-push.outputs.digest }}
        # This step uses the identity token to provision an ephemeral certificate
        # against the sigstore community Fulcio instance.
        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}

      - name: Sign the published migrate Docker image
        if: ${{ github.event_name != 'pull_request' }}
        env:
          TAGS: ${{ steps.meta-migrate.outputs.tags }}
          DIGEST: ${{ steps.build-and-push-migrate.outputs.digest }}
        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}
