name: Build Docker Image

on:
  workflow_dispatch:
    inputs:
      release:
        description: Publish release aliases and redeploy production (false runs a cache-only build, then publishes a canary)
        type: boolean
        default: false
  push:
    branches:
      - main
    tags:
      - "v*"

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

env:
  GHCR_IMAGE: ghcr.io/${{ github.repository }}
  DOCKER_IMAGE: docker.io/amruthpillai/reactive-resume
  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true

jobs:
  mode:
    runs-on: ${{ vars.USE_BLACKSMITH == 'true' && 'blacksmith-2vcpu-ubuntu-2404' || 'ubuntu-latest' }}

    outputs:
      nightly: ${{ steps.mode.outputs.nightly }}
      release: ${{ steps.mode.outputs.release }}
      canary: ${{ steps.mode.outputs.canary }}

    steps:
      - name: Determine publishing mode
        id: mode
        env:
          EVENT_NAME: ${{ github.event_name }}
          GIT_REF: ${{ github.ref }}
          RELEASE: ${{ inputs.release }}
        run: |
          if [[ "$EVENT_NAME" == "push" && "$GIT_REF" == "refs/heads/main" ]]; then
            echo "nightly=true" >> "$GITHUB_OUTPUT"
            echo "release=false" >> "$GITHUB_OUTPUT"
            echo "canary=false" >> "$GITHUB_OUTPUT"
          elif [[ "$EVENT_NAME" == "workflow_dispatch" && "$RELEASE" != "true" ]]; then
            echo "nightly=false" >> "$GITHUB_OUTPUT"
            echo "release=false" >> "$GITHUB_OUTPUT"
            echo "canary=true" >> "$GITHUB_OUTPUT"
          else
            echo "nightly=false" >> "$GITHUB_OUTPUT"
            echo "release=true" >> "$GITHUB_OUTPUT"
            echo "canary=false" >> "$GITHUB_OUTPUT"
          fi

  build:
    needs: mode

    strategy:
      fail-fast: false
      matrix:
        include:
          - platform: linux/amd64
            runner: ${{ vars.USE_BLACKSMITH == 'true' && 'blacksmith-32vcpu-ubuntu-2404' || 'ubuntu-latest' }}
            arch: amd64
          - platform: linux/arm64
            runner: ${{ vars.USE_BLACKSMITH == 'true' && 'blacksmith-32vcpu-ubuntu-2404-arm' || 'ubuntu-24.04-arm' }}
            arch: arm64

    runs-on: ${{ matrix.runner }}
    timeout-minutes: 30

    permissions:
      contents: read
      packages: write
      id-token: write
      attestations: write

    steps:
      - name: Checkout Repository
        if: ${{ vars.USE_BLACKSMITH != 'true' }}
        uses: actions/checkout@v6

      - name: Checkout Repository (Blacksmith)
        if: ${{ vars.USE_BLACKSMITH == 'true' }}
        uses: useblacksmith/checkout@v1

      - name: Setup Docker Buildx
        if: ${{ vars.USE_BLACKSMITH != 'true' }}
        uses: docker/setup-buildx-action@v4

      # Persists BuildKit layers and the Dockerfile's pnpm cache mounts between runs, one cache per architecture.
      - name: Setup Docker Builder (Blacksmith)
        if: ${{ vars.USE_BLACKSMITH == 'true' }}
        uses: useblacksmith/setup-docker-builder@v2
        with:
          cache-key: Dockerfile-${{ matrix.arch }}

      - &registries
        name: Determine registries
        id: registries
        env:
          DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
          DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
        run: |
          set -euo pipefail

          dockerhub=false
          ghcr_image="${GHCR_IMAGE,,}"
          docker_image="${DOCKER_IMAGE,,}"
          images="$ghcr_image"
          if [[ -n "$DOCKER_USERNAME" && -n "$DOCKER_PASSWORD" ]]; then
            dockerhub=true
            images="${images}"$'\n'"$docker_image"
          fi

          {
            echo "ghcr_image=$ghcr_image"
            echo "docker_image=$docker_image"
            echo "images<<EOF"
            echo "$images"
            echo "EOF"
            echo "dockerhub=$dockerhub"
          } >> "$GITHUB_OUTPUT"

      - name: Login to Docker Hub
        if: ${{ steps.registries.outputs.dockerhub == 'true' }}
        uses: docker/login-action@v4
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v6
        with:
          images: ${{ steps.registries.outputs.images }}
          tags: |
            type=sha,prefix=sha-,suffix=-${{ matrix.arch }}

      - name: Cache-only smoke build
        if: ${{ needs.mode.outputs.canary == 'true' && vars.USE_BLACKSMITH != 'true' }}
        uses: docker/build-push-action@v7
        with: &cache-only-build
          context: .
          platforms: ${{ matrix.platform }}
          outputs: type=cacheonly

      - name: Cache-only smoke build (Blacksmith)
        if: ${{ needs.mode.outputs.canary == 'true' && vars.USE_BLACKSMITH == 'true' }}
        uses: useblacksmith/build-push-action@v2
        with: *cache-only-build

      - name: Build and Push by Digest
        id: build
        if: ${{ vars.USE_BLACKSMITH != 'true' }}
        uses: docker/build-push-action@v7
        with: &build-push
          context: .
          sbom: true
          push: true
          provenance: mode=max
          platforms: ${{ matrix.platform }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          annotations: ${{ steps.meta.outputs.annotations }}

      - name: Build and Push by Digest (Blacksmith)
        id: build-blacksmith
        if: ${{ vars.USE_BLACKSMITH == 'true' }}
        uses: useblacksmith/build-push-action@v2
        with: *build-push

      - name: Export digest
        run: |
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest || steps.build-blacksmith.outputs.digest }}"
          touch "/tmp/digests/${digest#sha256:}"

      - name: Upload digest
        uses: actions/upload-artifact@v7
        with:
          name: digests-${{ matrix.arch }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  merge:
    needs:
      - mode
      - build
    timeout-minutes: 30
    runs-on: ${{ vars.USE_BLACKSMITH == 'true' && 'blacksmith-2vcpu-ubuntu-2404' || 'ubuntu-latest' }}

    env:
      DEPLOY: ${{ secrets.SSH_KEY != '' && secrets.SSH_HOST != '' && secrets.SSH_USER != '' }}
      PURGE_CLOUDFLARE: ${{ secrets.CLOUDFLARE_ZONE_ID != '' && secrets.CLOUDFLARE_API_TOKEN != '' }}

    permissions:
      contents: read
      packages: write
      id-token: write
      attestations: write

    steps:
      - name: Checkout Repository
        if: ${{ vars.USE_BLACKSMITH != 'true' }}
        uses: actions/checkout@v6
        with: &checkout-package-json
          sparse-checkout: package.json
          sparse-checkout-cone-mode: false

      - name: Checkout Repository (Blacksmith)
        if: ${{ vars.USE_BLACKSMITH == 'true' }}
        uses: useblacksmith/checkout@v1
        with: *checkout-package-json

      - name: Get version from package.json
        id: version
        run: echo "version=$(jq -r .version package.json)" >> "$GITHUB_OUTPUT"

      - name: Download digests
        uses: actions/download-artifact@v8
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true

      - name: Setup Docker Buildx
        uses: docker/setup-buildx-action@v4

      - *registries

      - name: Login to Docker Hub
        if: ${{ steps.registries.outputs.dockerhub == 'true' }}
        uses: docker/login-action@v4
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Parse version components
        id: semver
        run: |
          VERSION="${{ steps.version.outputs.version }}"
          MAJOR=$(echo "$VERSION" | cut -d. -f1)
          MINOR=$(echo "$VERSION" | cut -d. -f2)

          echo "major=$MAJOR" >> "$GITHUB_OUTPUT"
          echo "minor=$MINOR" >> "$GITHUB_OUTPUT"

      - name: Extract metadata for Docker
        id: meta
        uses: docker/metadata-action@v6
        with:
          images: ${{ steps.registries.outputs.images }}
          tags: |
            type=sha,prefix=sha-
            type=raw,value=canary-${{ github.run_id }}-${{ github.run_attempt }},enable=${{ needs.mode.outputs.canary == 'true' }}
            type=raw,value=nightly,enable=${{ needs.mode.outputs.nightly == 'true' }}
            type=raw,value=nightly-{{date 'YYYYMMDDHHmmss' tz='UTC'}},enable=${{ needs.mode.outputs.nightly == 'true' }}
            type=raw,value=latest,enable=${{ needs.mode.outputs.release == 'true' }}
            type=raw,value=v${{ steps.version.outputs.version }},enable=${{ needs.mode.outputs.release == 'true' }}
            type=raw,value=v${{ steps.semver.outputs.major }}.${{ steps.semver.outputs.minor }},enable=${{ needs.mode.outputs.release == 'true' }}
            type=raw,value=v${{ steps.semver.outputs.major }},enable=${{ needs.mode.outputs.release == 'true' }}

      - name: Create manifest list and push
        id: manifest
        working-directory: /tmp/digests
        run: |
          set -euo pipefail

          if [[ "${{ needs.mode.outputs.nightly }}" == "true" ]]; then
            FINAL_TAG="nightly"
          elif [[ "${{ needs.mode.outputs.canary }}" == "true" ]]; then
            FINAL_TAG="canary-${{ github.run_id }}-${{ github.run_attempt }}"
          else
            FINAL_TAG="v${{ steps.version.outputs.version }}"
          fi

          docker buildx imagetools create \
            $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            --annotation "index:org.opencontainers.image.licenses=MIT" \
            --annotation "index:org.opencontainers.image.title=Reactive Resume" \
            --annotation "index:org.opencontainers.image.description=A free and open-source resume builder." \
            --annotation "index:org.opencontainers.image.vendor=Amruth Pillai" \
            --annotation "index:org.opencontainers.image.url=https://rxresu.me" \
            --annotation "index:org.opencontainers.image.documentation=https://docs.rxresu.me" \
            --annotation "index:org.opencontainers.image.source=https://github.com/${{ github.repository }}" \
            --annotation "index:org.opencontainers.image.version=${{ steps.version.outputs.version }}" \
            $(printf '${{ steps.registries.outputs.ghcr_image }}@sha256:%s ' *)

          # Get the digest of the multi-arch manifest
          GHCR_DIGEST=$(docker buildx imagetools inspect ${{ steps.registries.outputs.ghcr_image }}:${FINAL_TAG} --format '{{json .Manifest.Digest}}' | tr -d '"')
          echo "final_tag=$FINAL_TAG" >> "$GITHUB_OUTPUT"
          echo "ghcr_digest=$GHCR_DIGEST" >> "$GITHUB_OUTPUT"

          if [[ "${{ steps.registries.outputs.dockerhub }}" == "true" ]]; then
            DOCKER_DIGEST=$(docker buildx imagetools inspect ${{ steps.registries.outputs.docker_image }}:${FINAL_TAG} --format '{{json .Manifest.Digest}}' | tr -d '"')
            echo "docker_digest=$DOCKER_DIGEST" >> "$GITHUB_OUTPUT"
          fi

      - name: Install Cosign
        uses: sigstore/cosign-installer@v3

      - name: Sign images with Cosign
        run: |
          # Sign GHCR image
          cosign sign --yes ${{ steps.registries.outputs.ghcr_image }}@${{ steps.manifest.outputs.ghcr_digest }}

          if [[ "${{ steps.registries.outputs.dockerhub }}" == "true" ]]; then
            # Sign Docker Hub image
            cosign sign --yes ${{ steps.registries.outputs.docker_image }}@${{ steps.manifest.outputs.docker_digest }}
          fi

      - name: Inspect image
        run: |
          docker buildx imagetools inspect ${{ steps.registries.outputs.ghcr_image }}:${{ steps.manifest.outputs.final_tag }}
          if [[ "${{ steps.registries.outputs.dockerhub }}" == "true" ]]; then
            docker buildx imagetools inspect ${{ steps.registries.outputs.docker_image }}:${{ steps.manifest.outputs.final_tag }}
          fi

      - name: Verify anonymous pulls on both architectures
        run: |
          set -euo pipefail
          registry_config=$(mktemp -d)
          trap 'rm -rf "$registry_config"' EXIT
          # Prevent Docker from discovering a system credential helper.
          printf '%s\n' '{"auths":{"ghcr.io":{},"https://index.docker.io/v1/":{}}}' > "$registry_config/config.json"
          images=("${{ steps.registries.outputs.ghcr_image }}")
          if [[ "${{ steps.registries.outputs.dockerhub }}" == "true" ]]; then
            images+=("${{ steps.registries.outputs.docker_image }}")
          fi
          for image in "${images[@]}"; do
            for platform in linux/amd64 linux/arm64; do
              docker --config "$registry_config" pull --quiet --platform "$platform" \
                "$image:${{ steps.manifest.outputs.final_tag }}"
            done
          done

      - name: Redeploy Stack
        if: ${{ needs.mode.outputs.release == 'true' && env.DEPLOY == 'true' }}
        uses: appleboy/ssh-action@v1
        with:
          key: ${{ secrets.SSH_KEY }}
          host: ${{ secrets.SSH_HOST }}
          username: ${{ secrets.SSH_USER }}
          script: |
            cd docker
            ./manage_stack.sh up reactive_resume

      - name: Purge Cloudflare cache
        if: ${{ needs.mode.outputs.release == 'true' && env.PURGE_CLOUDFLARE == 'true' }}
        env:
          CLOUDFLARE_ZONE_ID: ${{ secrets.CLOUDFLARE_ZONE_ID }}
          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
        run: |
          set -euo pipefail

          response=$(curl -fsS --max-time 10 --retry 3 --retry-delay 5 --retry-connrefused -X POST \
            "https://api.cloudflare.com/client/v4/zones/${CLOUDFLARE_ZONE_ID}/purge_cache" \
            -H "Authorization: Bearer ${CLOUDFLARE_API_TOKEN}" \
            -H "Content-Type: application/json" \
            --data '{"purge_everything":true}')

          if [ "$(jq -r '.success' <<< "$response")" != "true" ]; then
            echo "$response" | jq .
            exit 1
          fi

          echo "Cloudflare cache purged successfully."