name: build-and-release

on:
  push:
    branches:
      - main
      - high-performance

concurrency:
  group: ai-assistant-build-${{ github.ref }}
  cancel-in-progress: true

jobs:
  build:
    runs-on: docker-ready
    env:
      DOCKER_BUILDKIT: "1"
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Point DOCKER_HOST at this container's own gateway
        run: |
          set -euo pipefail
          # 127.0.0.1 doesn't work: the job container is nested one level
          # inside the runner pod's dind sidecar, so its own loopback isn't
          # the sidecar's. Read the container's actual default-route gateway
          # from /proc/net/route instead (the dind engine that spawned it).
          GATEWAY="$(awk '$2 == "00000000" {print $3}' /proc/net/route | head -1 | \
            sed -E 's/(..)(..)(..)(..)/0x\4 0x\3 0x\2 0x\1/' | \
            { read -r a b c d; printf '%d.%d.%d.%d' "$a" "$b" "$c" "$d"; })"
          echo "Detected docker host gateway: $GATEWAY"
          echo "DOCKER_HOST=tcp://$GATEWAY:2375" >> "$GITHUB_ENV"

      - name: Set up Docker Buildx
        run: |
          set -euo pipefail
          for attempt in $(seq 1 30); do
            if docker version >/dev/null 2>&1; then
              break
            fi
            sleep 2
          done
          docker version
          docker buildx create --use --name nxtgauge-builder || docker buildx use nxtgauge-builder
          docker buildx inspect --bootstrap

      - name: Login to Forgejo registry
        env:
          REGISTRY_HOST: ci.nxtgauge.com
          REGISTRY_USERNAME: ${{ secrets.REGISTRY_USERNAME }}
          REGISTRY_PASSWORD: ${{ secrets.REGISTRY_PASSWORD }}
        run: |
          set -euo pipefail
          printf '%s' "$REGISTRY_PASSWORD" | docker login "$REGISTRY_HOST" -u "$REGISTRY_USERNAME" --password-stdin

      - name: Build and push image
        env:
          REGISTRY_HOST: ci.nxtgauge.com
          SHA: ${{ github.sha }}
        run: |
          set -euo pipefail
          image_ref="$REGISTRY_HOST/ashwin/nxtgauge-ai-assistant:$SHA"
          metadata_file="/tmp/ai-assistant-metadata.json"

          docker buildx build --push \
            --metadata-file "$metadata_file" \
            -t "$image_ref" \
            -t "$REGISTRY_HOST/ashwin/nxtgauge-ai-assistant:latest" \
            -f Dockerfile \
            .

          digest="$(grep -o '"containerimage\.digest"[[:space:]]*:[[:space:]]*"sha256:[^"]*"' "$metadata_file" | grep -o 'sha256:[^"]*')"
          test -n "$digest"
          echo "IMAGE_DIGEST=$digest" >> "$GITHUB_ENV"

      - name: Update GitOps
        env:
          GITOPS_REPO: https://ci.nxtgauge.com/ashwin/nxtgauge-gitops.git
          GITOPS_TOKEN: ${{ secrets.GITOPS_TOKEN }}
          SHA: ${{ github.sha }}
          DIGEST: ${{ env.IMAGE_DIGEST }}
        run: |
          set -euo pipefail
          apk add --no-cache git

          git config --global credential.helper '!f() { printf "%s\\n" "username=forgejo-actions"; printf "%s\\n" "password=$GITOPS_TOKEN"; }; f'

          GITOPS_DIR=$(mktemp -d)
          # -b main: this repo's server-side HEAD symref is broken (returns
          # "remote HEAD refers to nonexistent ref" on a plain clone even
          # though refs/heads/main exists) - an explicit branch bypasses
          # HEAD resolution entirely instead of relying on it.
          git clone -b main "$GITOPS_REPO" "$GITOPS_DIR"
          cd "$GITOPS_DIR"

          # release-patch.yaml pins by digest (@sha256:...), not by mutable
          # tag - Flux's ImageUpdateAutomation previously raced this file via
          # a $imagepolicy marker comment and always won because its
          # alphabetical tag ordering sorted "latest" above any hex SHA,
          # clobbering this step's commits every ~2 minutes. The marker was
          # removed from the file so this CI step is now the sole writer.
          sed -i -E "s#image: ci\.nxtgauge\.com/ashwin/nxtgauge-ai-assistant(:[a-f0-9]+|@sha256:[a-f0-9]+)#image: ci.nxtgauge.com/ashwin/nxtgauge-ai-assistant@${DIGEST}#" apps/nxtgauge-ai-assistant/overlays/prod/release-patch.yaml

          git config user.name "forgejo-actions[bot]"
          git config user.email "forgejo-actions@ci.nxtgauge.com"
          git add apps/nxtgauge-ai-assistant/overlays/prod/release-patch.yaml
          git diff --quiet || (git commit -m "chore(gitops): deploy ai-assistant@${SHA} (${DIGEST})" && git push)