name: Build and Push Docker Image

on:
  push:
    tags: ['v*']
  workflow_dispatch:

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

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

jobs:
  build:
    runs-on: ${{ matrix.runner }}
    permissions:
      contents: read
      packages: write
    strategy:
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-latest
          - platform: linux/arm64
            runner: ubuntu-24.04-arm

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

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

      - name: Log in to Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels)
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.IMAGE_NAME }}
          tags: |
            type=raw,value=latest
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}

      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@v5
        with:
          context: .
          file: ./Dockerfile
          target: runtime
          platforms: ${{ matrix.platform }}
          labels: ${{ steps.meta.outputs.labels }}
          outputs: type=image,name=${{ env.IMAGE_NAME }},push-by-digest=true,name-canonical=true,push=true
          cache-from: type=gha,scope=${{ matrix.platform }}
          cache-to: type=gha,mode=max,scope=${{ matrix.platform }}

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

      - name: Upload digest
        uses: actions/upload-artifact@v4
        with:
          name: digests-${{ matrix.runner }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  merge:
    needs: build
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true

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

      - name: Log in to Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels)
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.IMAGE_NAME }}
          tags: |
            type=raw,value=latest
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}

      - name: Create manifest list and push
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf '${{ env.IMAGE_NAME }}@sha256:%s ' *)

  cleanup:
    name: Cleanup old runs and artifacts
    if: startsWith(github.ref, 'refs/tags/')
    runs-on: ubuntu-latest
    needs: merge
    permissions:
      actions: write
    steps:
      - name: Cleanup old workflow runs and artifacts
        uses: actions/github-script@v7
        with:
          script: |
            const keepCount = 5;
            const { owner, repo } = context.repo;

            core.info('Fetching workflow runs...');
            const runs = await github.paginate(
              github.rest.actions.listWorkflowRunsForRepo,
              { owner, repo, per_page: 100 }
            );
            const sortedRuns = runs.sort((a, b) =>
              new Date(b.created_at) - new Date(a.created_at)
            );
            const runsToDelete = sortedRuns.slice(keepCount);
            core.info(`Found ${runs.length} workflow runs, deleting ${runsToDelete.length} older runs...`);
            for (const run of runsToDelete) {
              try {
                await github.rest.actions.deleteWorkflowRun({ owner, repo, run_id: run.id });
              } catch (error) {
                core.warning(`Failed to delete run ${run.id}: ${error.message}`);
              }
            }

            core.info('Fetching artifacts...');
            const artifacts = await github.paginate(
              github.rest.actions.listArtifactsForRepo,
              { owner, repo, per_page: 100 }
            );
            const sortedArtifacts = artifacts
              .filter(artifact => !artifact.expired)
              .sort((a, b) => new Date(b.created_at) - new Date(a.created_at));
            const artifactsToDelete = sortedArtifacts.slice(keepCount);
            core.info(`Found ${artifacts.length} artifacts, deleting ${artifactsToDelete.length} older artifacts...`);
            for (const artifact of artifactsToDelete) {
              try {
                await github.rest.actions.deleteArtifact({ owner, repo, artifact_id: artifact.id });
              } catch (error) {
                core.warning(`Failed to delete artifact ${artifact.id}: ${error.message}`);
              }
            }

  cleanup-ghcr:
    name: Cleanup old GHCR images
    if: startsWith(github.ref, 'refs/tags/')
    runs-on: ubuntu-latest
    needs: merge
    permissions:
      packages: write
    steps:
      - name: Delete untagged and old images
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.RELEASES_TOKEN || secrets.GITHUB_TOKEN }}
          script: |
            const keepCount = 5;
            const { owner, repo } = context.repo;
            const packageName = repo.toLowerCase();

            try {
              const ownerInfo = await github.rest.users.getByUsername({ username: owner });
              const isOrg = ownerInfo.data.type === 'Organization';
              const ownerArgs = isOrg ? { org: owner } : { username: owner };
              const listVersions = isOrg
                ? github.rest.packages.getAllPackageVersionsForPackageOwnedByOrg
                : github.rest.packages.getAllPackageVersionsForPackageOwnedByUser;
              const deleteVersion = isOrg
                ? github.rest.packages.deletePackageVersionForOrg
                : github.rest.packages.deletePackageVersionForUser;

              const versions = await github.paginate(
                listVersions,
                {
                  package_type: 'container',
                  package_name: packageName,
                  per_page: 100,
                  state: 'active',
                  ...ownerArgs,
                }
              );

              const taggedVersions = versions.filter(v => v.metadata?.container?.tags?.length > 0);
              const untaggedVersions = versions.filter(v => !v.metadata?.container?.tags || v.metadata.container.tags.length === 0);
              const sortedTagged = taggedVersions.sort((a, b) =>
                new Date(b.created_at) - new Date(a.created_at)
              );
              const taggedToDelete = sortedTagged.slice(keepCount);

              const oldestKept = sortedTagged.length > 0
                ? new Date(sortedTagged[Math.min(keepCount, sortedTagged.length) - 1].created_at)
                : new Date();
              const untaggedToDelete = untaggedVersions.filter(v =>
                new Date(v.created_at) < oldestKept
              );

              for (const version of untaggedToDelete) {
                try {
                  await deleteVersion({
                    package_type: 'container',
                    package_name: packageName,
                    package_version_id: version.id,
                    ...ownerArgs,
                  });
                } catch (error) {
                  core.warning(`Failed to delete untagged version ${version.id}: ${error.message}`);
                }
              }

              for (const version of taggedToDelete) {
                try {
                  await deleteVersion({
                    package_type: 'container',
                    package_name: packageName,
                    package_version_id: version.id,
                    ...ownerArgs,
                  });
                } catch (error) {
                  core.warning(`Failed to delete tagged version ${version.id}: ${error.message}`);
                }
              }
            } catch (error) {
              if (error.status === 404) {
                core.info('No package found; skipping GHCR cleanup.');
              } else {
                core.setFailed(`Error managing package versions: ${error.message}`);
              }
            }