name: Build and Push Docker Image

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

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

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 ' *)

  prune-releases:
    name: Prune old releases
    runs-on: ubuntu-latest
    needs: merge
    permissions:
      contents: write
    steps:
      - name: Prune releases and tags
        uses: actions/github-script@v7
        with:
          script: |
            const keep = 5;
            const { owner, repo } = context.repo;
            const releases = await github.paginate(github.rest.repos.listReleases, {
              owner,
              repo,
              per_page: 100,
            });
            core.info(`Found ${releases.length} releases; keeping latest ${keep}.`);
            const toDelete = releases.slice(keep);
            for (const release of toDelete) {
              core.info(`Deleting release ${release.tag_name} (id ${release.id})`);
              await github.rest.repos.deleteRelease({
                owner,
                repo,
                release_id: release.id,
              });
              if (!release.tag_name) {
                core.info(`Release ${release.id} has no tag.`);
                continue;
              }
              const refs = await github.rest.git.listMatchingRefs({
                owner,
                repo,
                ref: `tags/${release.tag_name}`,
              });
              if (refs.data.length === 0) {
                core.info(`Tag ${release.tag_name} not found; skipping.`);
                continue;
              }
              await github.rest.git.deleteRef({
                owner,
                repo,
                ref: `tags/${release.tag_name}`,
              });
            }

  cleanup:
    name: Cleanup old runs, tags, and artifacts
    runs-on: ubuntu-latest
    needs: merge
    permissions:
      actions: write
      contents: write
    steps:
      - name: Cleanup old workflow runs, tags, 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, keeping ${keepCount} newest, deleting ${runsToDelete.length} older...`);
            for (const run of runsToDelete) {
              core.info(`Deleting run #${run.run_number} from ${run.created_at}`);
              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 tags...');
            const tags = await github.paginate(
              github.rest.repos.listTags,
              {
                owner,
                repo,
                per_page: 100,
              }
            );

            const currentTag = context.ref.replace('refs/tags/', '');
            const otherTags = tags.filter(tag => tag.name !== currentTag);
            const tagsToDelete = otherTags.slice(keepCount);

            core.info(`Found ${tags.length} tags, keeping ${keepCount} newest (including current: ${currentTag}), deleting ${tagsToDelete.length} older...`);
            for (const tag of tagsToDelete) {
              core.info(`Deleting tag ${tag.name}`);
              try {
                await github.rest.git.deleteRef({
                  owner,
                  repo,
                  ref: `tags/${tag.name}`,
                });
              } catch (error) {
                core.warning(`Failed to delete tag ${tag.name}: ${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, keeping ${keepCount} newest, deleting ${artifactsToDelete.length} older...`);
            for (const artifact of artifactsToDelete) {
              core.info(`Deleting artifact ${artifact.name} (id ${artifact.id})`);
              try {
                await github.rest.actions.deleteArtifact({
                  owner,
                  repo,
                  artifact_id: artifact.id,
                });
              } catch (error) {
                core.warning(`Failed to delete artifact ${artifact.id}: ${error.message}`);
              }
            }

  prune-docker-images:
    name: Prune old Docker images
    runs-on: ubuntu-latest
    needs: merge
    permissions:
      packages: write
    steps:
      - name: Delete untagged 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();
            
            core.info(`Cleaning Docker images for repository: ${owner}/${repo}`);
            core.info(`Package name in registry: ${packageName}`);
            
            try {
              // Get all package versions for THIS repository's container package only
              const versions = await github.paginate(
                github.rest.packages.getAllPackageVersionsForPackageOwnedByOrg,
                {
                  package_type: 'container',
                  package_name: packageName,  // This filters to only this repo's images
                  org: owner,
                  per_page: 100,
                  state: 'active',
                }
              );
              
              core.info(`Found ${versions.length} package versions`);
              
              // Separate tagged and untagged versions
              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);
              
              core.info(`Tagged versions: ${taggedVersions.length}, Untagged versions: ${untaggedVersions.length}`);
              
              // Delete all untagged versions
              for (const version of untaggedVersions) {
                core.info(`Deleting untagged version ${version.id} (created: ${version.created_at})`);
                try {
                  await github.rest.packages.deletePackageVersionForOrg({
                    package_type: 'container',
                    package_name: packageName,
                    org: owner,
                    package_version_id: version.id,
                  });
                } catch (error) {
                  core.warning(`Failed to delete untagged version ${version.id}: ${error.message}`);
                }
              }
              
              // Sort tagged versions by creation date (newest first)
              const sortedTagged = taggedVersions.sort((a, b) => 
                new Date(b.created_at) - new Date(a.created_at)
              );
              
              // Keep the newest versions, delete the rest
              const versionsToDelete = sortedTagged.slice(keepCount);
              
              core.info(`Keeping ${keepCount} newest tagged versions, deleting ${versionsToDelete.length} older ones...`);
              for (const version of versionsToDelete) {
                const tags = version.metadata?.container?.tags?.join(', ') || 'unknown';
                core.info(`Deleting version ${version.id} with tags: ${tags} (created: ${version.created_at})`);
                try {
                  await github.rest.packages.deletePackageVersionForOrg({
                    package_type: 'container',
                    package_name: packageName,
                    org: owner,
                    package_version_id: version.id,
                  });
                } catch (error) {
                  core.warning(`Failed to delete version ${version.id}: ${error.message}`);
                }
              }
              
            } catch (error) {
              if (error.status === 404) {
                core.info('No package found - this might be the first build');
              } else {
                core.setFailed(`Error managing package versions: ${error.message}`);
              }
            }