name: Container Image
run-name: >-
  ${{ github.event_name == 'workflow_run' && format('Image - {0} ({1})', github.event.workflow_run.head_commit.message, github.event.workflow_run.head_branch) || format('Image - {0}', github.ref_name) }}

on:
  # Break-glass: bypasses CI/E2E gate. Use only when CI is broken and a hotfix image is urgently needed.
  workflow_dispatch:
    inputs:
      force_rebuild:
        description: Rebuild even if image for this SHA already exists in GHCR
        type: boolean
        default: false
  workflow_run:
    workflows: ["CI"]
    types: [completed]
    branches: [main]

concurrency:
  group: ${{ github.workflow }}-${{ github.event_name == 'workflow_run' && github.event.workflow_run.head_sha || github.sha }}
  cancel-in-progress: true

permissions:
  actions: read
  contents: read

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  # Main push path: resolve context once, then build multi-arch natively in parallel.
  prepare:
    name: Resolve Build Context
    if: >
      github.event_name == 'workflow_dispatch' ||
      (github.event_name == 'workflow_run' &&
       github.event.workflow_run.conclusion == 'success' &&
       github.event.workflow_run.event == 'push')
    runs-on: ubuntu-latest
    timeout-minutes: 5
    permissions:
      contents: read
      packages: read
    outputs:
      source_sha: ${{ steps.ctx.outputs.source_sha }}
      source_sha_short: ${{ steps.ctx.outputs.source_sha_short }}
      update_main: ${{ steps.ctx.outputs.update_main }}
      skip_build: ${{ steps.ctx.outputs.skip_build }}
    steps:
      - name: Resolve build context
        id: ctx
        shell: bash
        env:
          EVENT_NAME: ${{ github.event_name }}
          GH_REF: ${{ github.ref }}
          WORKFLOW_RUN_HEAD_SHA: ${{ github.event.workflow_run.head_sha }}
          GH_SHA: ${{ github.sha }}
          GH_TOKEN: ${{ github.token }}
          IMAGE_NAME: ${{ github.repository }}
          FORCE_REBUILD: ${{ inputs.force_rebuild }}
        run: |
          if [[ "$EVENT_NAME" == "workflow_dispatch" && "$GH_REF" != "refs/heads/main" ]]; then
            echo "::error::workflow_dispatch is only supported from main."
            exit 1
          fi
          if [[ "$EVENT_NAME" == "workflow_run" ]]; then
            SOURCE_SHA="$WORKFLOW_RUN_HEAD_SHA"
            echo "update_main=true" >> "$GITHUB_OUTPUT"
          else
            SOURCE_SHA="$GH_SHA"
            echo "update_main=false" >> "$GITHUB_OUTPUT"
          fi
          SOURCE_SHA_SHORT="${SOURCE_SHA:0:12}"
          echo "source_sha=${SOURCE_SHA}" >> "$GITHUB_OUTPUT"
          echo "source_sha_short=${SOURCE_SHA_SHORT}" >> "$GITHUB_OUTPUT"
          IMAGE_LOWER=$(echo "${IMAGE_NAME}" | tr '[:upper:]' '[:lower:]')
          HTTP_STATUS_SHORT=$(curl -s -o /dev/null -w "%{http_code}" \
            -H "Authorization: Bearer ${GH_TOKEN}" \
            -H "Accept: application/vnd.oci.image.index.v1+json" \
            "https://ghcr.io/v2/${IMAGE_LOWER}/manifests/sha-${SOURCE_SHA_SHORT}")
          HTTP_STATUS_FULL=$(curl -s -o /dev/null -w "%{http_code}" \
            -H "Authorization: Bearer ${GH_TOKEN}" \
            -H "Accept: application/vnd.oci.image.index.v1+json" \
            "https://ghcr.io/v2/${IMAGE_LOWER}/manifests/sha-${SOURCE_SHA}")
          if [[ ("$HTTP_STATUS_SHORT" == "200" || "$HTTP_STATUS_FULL" == "200") && "${FORCE_REBUILD}" != "true" ]]; then
            echo "Image sha-${SOURCE_SHA_SHORT} already exists in GHCR, skipping rebuild."
            echo "skip_build=true" >> "$GITHUB_OUTPUT"
          else
            echo "skip_build=false" >> "$GITHUB_OUTPUT"
          fi

  build-amd64:
    name: Build and Push amd64
    needs: [prepare]
    if: needs.prepare.outputs.skip_build != 'true'
    runs-on: ubuntu-latest
    timeout-minutes: 45
    permissions:
      contents: read
      packages: write
    outputs:
      digest: ${{ steps.build.outputs.digest }}
    env:
      REGISTRY: ghcr.io
      IMAGE_NAME: ${{ github.repository }}
    steps:
      - name: Checkout
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          ref: ${{ needs.prepare.outputs.source_sha }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@594f3bf4285d9ea8dc53c9a0c9c4092420091003 # v4.4.0

      - name: Log in to GHCR
        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GHCR_TOKEN != '' && secrets.GHCR_TOKEN || github.token }}

      - name: Build image
        id: build
        uses: docker/build-push-action@c3c9e263c25d99ce0380d002d59b67737d91b0dc # v7.4.0
        with:
          context: .
          file: ./Dockerfile
          outputs: type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }},push-by-digest=true,name-canonical=true,push=true
          platforms: linux/amd64
          build-args: APP_VERSION=sha-${{ needs.prepare.outputs.source_sha_short }}
          cache-from: type=gha,scope=container-image-yml-amd64
          cache-to: type=gha,mode=max,scope=container-image-yml-amd64

      - name: Scan image with Trivy
        uses: aquasecurity/trivy-action@ed142fd0673e97e23eac54620cfb913e5ce36c25 # v0.36.0
        env:
          TRIVY_PLATFORM: linux/amd64
        with:
          image-ref: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}@${{ steps.build.outputs.digest }}
          format: table
          vuln-type: os,library
          severity: CRITICAL,HIGH
          ignore-unfixed: true
          exit-code: "1"

  build-arm64:
    name: Build and Push arm64
    needs: [prepare]
    if: needs.prepare.outputs.skip_build != 'true'
    runs-on: ubuntu-24.04-arm
    timeout-minutes: 45
    permissions:
      contents: read
      packages: write
    outputs:
      digest: ${{ steps.build.outputs.digest }}
    env:
      REGISTRY: ghcr.io
      IMAGE_NAME: ${{ github.repository }}
    steps:
      - name: Checkout
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          ref: ${{ needs.prepare.outputs.source_sha }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@594f3bf4285d9ea8dc53c9a0c9c4092420091003 # v4.4.0

      - name: Log in to GHCR
        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GHCR_TOKEN != '' && secrets.GHCR_TOKEN || github.token }}

      - name: Build image
        id: build
        uses: docker/build-push-action@c3c9e263c25d99ce0380d002d59b67737d91b0dc # v7.4.0
        with:
          context: .
          file: ./Dockerfile
          outputs: type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }},push-by-digest=true,name-canonical=true,push=true
          platforms: linux/arm64
          build-args: APP_VERSION=sha-${{ needs.prepare.outputs.source_sha_short }}
          cache-from: type=gha,scope=container-image-yml-arm64
          cache-to: type=gha,mode=max,scope=container-image-yml-arm64

      - name: Scan image with Trivy
        uses: aquasecurity/trivy-action@ed142fd0673e97e23eac54620cfb913e5ce36c25 # v0.36.0
        env:
          TRIVY_PLATFORM: linux/arm64
        with:
          image-ref: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}@${{ steps.build.outputs.digest }}
          format: table
          vuln-type: os,library
          severity: CRITICAL,HIGH
          ignore-unfixed: true
          exit-code: "1"

  merge-manifest:
    name: Merge and Push Multi-Arch Manifest
    needs: [prepare, build-amd64, build-arm64]
    if: needs.prepare.outputs.skip_build != 'true'
    runs-on: ubuntu-latest
    timeout-minutes: 10
    permissions:
      contents: read
      packages: write
    env:
      REGISTRY: ghcr.io
      IMAGE_NAME: ${{ github.repository }}
    steps:
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@594f3bf4285d9ea8dc53c9a0c9c4092420091003 # v4.4.0

      - name: Log in to GHCR
        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GHCR_TOKEN != '' && secrets.GHCR_TOKEN || github.token }}

      - name: Create SHA manifest
        shell: bash
        env:
          REGISTRY: ${{ env.REGISTRY }}
          IMAGE: ${{ env.IMAGE_NAME }}
          SHA_SHORT: ${{ needs.prepare.outputs.source_sha_short }}
          AMD64_DIGEST: ${{ needs.build-amd64.outputs.digest }}
          ARM64_DIGEST: ${{ needs.build-arm64.outputs.digest }}
        run: |
          FULL_IMAGE="${REGISTRY}/${IMAGE}"
          docker buildx imagetools create \
            --tag "${FULL_IMAGE}:sha-${SHA_SHORT}" \
            "${FULL_IMAGE}@${AMD64_DIGEST}" \
            "${FULL_IMAGE}@${ARM64_DIGEST}"

      - name: Update main tag
        if: needs.prepare.outputs.update_main == 'true'
        shell: bash
        env:
          REGISTRY: ${{ env.REGISTRY }}
          IMAGE: ${{ env.IMAGE_NAME }}
          AMD64_DIGEST: ${{ needs.build-amd64.outputs.digest }}
          ARM64_DIGEST: ${{ needs.build-arm64.outputs.digest }}
        run: |
          FULL_IMAGE="${REGISTRY}/${IMAGE}"
          docker buildx imagetools create \
            --tag "${FULL_IMAGE}:main" \
            "${FULL_IMAGE}@${AMD64_DIGEST}" \
            "${FULL_IMAGE}@${ARM64_DIGEST}"

      - name: Inspect SHA manifest
        shell: bash
        env:
          REGISTRY: ${{ env.REGISTRY }}
          IMAGE: ${{ env.IMAGE_NAME }}
          SHA_SHORT: ${{ needs.prepare.outputs.source_sha_short }}
        run: docker buildx imagetools inspect "${REGISTRY}/${IMAGE}:sha-${SHA_SHORT}"