name: CD

on:
  push:
    branches: [main]
    tags: ["v*"]
  pull_request:
    branches: [main]

env:
  IMAGE: cad-atlas

jobs:
  guard:
    name: Detect unsubstituted template
    runs-on: self-hosted
    outputs:
      is_template: ${{ steps.detect.outputs.is_template }}
    steps:
      - uses: actions/checkout@v4
      - id: detect
        # Detect an UNSUBSTITUTED template by the leftover __PLACEHOLDER__ tokens.
        # Must not grep for the substituted module path — that pattern is itself
        # substituted at generate time, so it would match every real child repo's
        # own go.mod and skip all CI forever (template-go-web bug, see repo #).
        run: |
          if grep -qE '__[A-Z_]+__' go.mod; then
            echo "is_template=true" >> "$GITHUB_OUTPUT"
          else
            echo "is_template=false" >> "$GITHUB_OUTPUT"
          fi

  check:
    name: Lint / Test / Vet
    needs: guard
    if: needs.guard.outputs.is_template != 'true'
    runs-on: self-hosted
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-go@v5
        with:
          go-version-file: go.mod
          cache: false

      - name: Install toolchain
        run: |
          go version
          go install github.com/a-h/templ/cmd/templ@latest
          curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/HEAD/install.sh \
            | sh -s -- -b "$(go env GOPATH)/bin" v2.11.4

      - name: Run checks
        run: task check

      - name: oathcandidate module — vet + test (private dep, short-lived askpass)
        working-directory: oathcandidate
        run: |
          set -euo pipefail
          export DMABE_GITEA_API_TOKEN='${{ secrets.DMABE_GITEA_API_TOKEN }}'
          ASKPASS=$(mktemp)
          { echo '#!/bin/sh'
            echo 'case "$1" in'
            echo '  *Username*) echo oauth2 ;;'
            echo '  *) echo "$DMABE_GITEA_API_TOKEN" ;;'
            echo 'esac'
          } > "$ASKPASS"
          chmod 700 "$ASKPASS"
          export GIT_ASKPASS="$ASKPASS" GIT_TERMINAL_PROMPT=0 GOPRIVATE=git.d-ma.be
          go vet ./...
          go test ./...
          rm -f "$ASKPASS"

  oath:
    name: var-go/oath
    needs: guard
    # cad-atlas's own real candidate (#8): oathcandidate/ parses the committed
    # .gitea/workflows/cd.yml and gates it against cad-atlas#8's oath — replacing the
    # earlier wiring-only proof (#1) that always gated swedsl's toy self-test fixture
    # and always failed closed. cmd/vargo-gate (swedsl#35/#37/#38) now go-installs
    # cleanly from its real module path and runs the candidate module in a sandboxed
    # subprocess (SubprocessGate, ADR-0003) — a green status here means "the committed
    # CI config satisfies its oath", not merely "the wiring ran". Still NOT required by
    # branch protection (#8) until proven green on a real PR.
    if: needs.guard.outputs.is_template != 'true' && github.event_name == 'pull_request'
    runs-on: self-hosted
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-go@v5
        with:
          go-version-file: oathcandidate/go.mod
          cache: false

      - name: Run vargo-gate (fetch linked oath -> sandboxed-gate the real candidate -> post status)
        env:
          VARGO_GITEA_BASEURL: ${{ github.server_url }}
          VARGO_GITEA_OWNER: ${{ github.repository_owner }}
          VARGO_GITEA_REPO: cad-atlas
          # Oath issue resolution (swedsl#38): a "Closes #NN" reference in the PR body
          # picks the linked oath issue; VARGO_GITEA_ISSUE is the fallback (PR's own
          # number, correct only for a PR filed directly against its oath issue).
          VARGO_PR_BODY: ${{ github.event.pull_request.body }}
          VARGO_GITEA_ISSUE: ${{ github.event.pull_request.number }}
          VARGO_GITEA_SHA: ${{ github.event.pull_request.head.sha }}
          VARGO_CANDIDATE_DIR: oathcandidate
          # Sandbox is ON by default (untrusted PR code runs in a fresh user+net
          # namespace, swedsl#37); no need to set VARGO_SANDBOX here.
        run: |
          set -euo pipefail
          export DMABE_GITEA_API_TOKEN='${{ secrets.DMABE_GITEA_API_TOKEN }}'
          ASKPASS=$(mktemp)
          { echo '#!/bin/sh'
            echo 'case "$1" in'
            echo '  *Username*) echo oauth2 ;;'
            echo '  *) echo "$DMABE_GITEA_API_TOKEN" ;;'
            echo 'esac'
          } > "$ASKPASS"
          chmod 700 "$ASKPASS"
          export GIT_ASKPASS="$ASKPASS" GIT_TERMINAL_PROMPT=0 GOPRIVATE=git.d-ma.be
          go run git.d-ma.be/mathias/swedsl/oath/cmd/vargo-gate@oath/v0.28.0
          rm -f "$ASKPASS"

  build:
    name: Build & Import
    needs: [guard, check]
    if: needs.guard.outputs.is_template != 'true' && github.event_name != 'pull_request'
    runs-on: self-hosted
    outputs:
      image-tag: ${{ steps.meta.outputs.sha-tag }}
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0   # full history + tags so `git describe` sees the SemVer tag

      - name: Derive image tags
        id: meta
        run: |
          SHA=$(git rev-parse --short HEAD)
          VERSION=$(git describe --tags --always --dirty)
          echo "sha-tag=${SHA}" >> "$GITHUB_OUTPUT"
          echo "version=${VERSION}" >> "$GITHUB_OUTPUT"

      - name: Build and push to local registry
        run: |
          REGISTRY="localhost:5000"
          REF="${REGISTRY}/${{ env.IMAGE }}:${{ steps.meta.outputs.sha-tag }}"
          buildah build \
            --build-arg VERSION="${{ steps.meta.outputs.version }}" \
            --label "org.opencontainers.image.revision=${{ github.sha }}" \
            -t ${REF} \
            -t ${REGISTRY}/${{ env.IMAGE }}:latest \
            .
          buildah push --tls-verify=false ${REF}
          buildah push --tls-verify=false ${REGISTRY}/${{ env.IMAGE }}:latest
          echo "✓ Image pushed to ${REF}"

  deploy:
    name: Deploy via GitOps
    needs: [guard, build]
    if: needs.guard.outputs.is_template != 'true' && github.ref == 'refs/heads/main' && github.event_name == 'push'
    runs-on: self-hosted
    steps:
      - name: Update image tag in infra repo
        env:
          IMAGE_TAG: ${{ needs.build.outputs.image-tag }}
          DEPLOY_KEY: ${{ secrets.INFRA_DEPLOY_KEY }}
        run: |
          set -euo pipefail
          mkdir -p ~/.ssh
          echo "$DEPLOY_KEY" > ~/.ssh/id_infra
          chmod 600 ~/.ssh/id_infra
          ssh-keyscan -p 30022 10.0.1.20 >> ~/.ssh/known_hosts 2>/dev/null
          export GIT_SSH_COMMAND="ssh -i ~/.ssh/id_infra -o IdentitiesOnly=yes"
          rm -rf /tmp/infra
          git clone -b main ssh://git@10.0.1.20:30022/mathias/infra.git /tmp/infra
          cd /tmp/infra
          DEPLOYMENT="k3s/apps/cad-atlas/deployment.yaml"
          sed -i "s|image: localhost:5000/cad-atlas:.*|image: localhost:5000/cad-atlas:${IMAGE_TAG}|" "$DEPLOYMENT"
          grep -q "localhost:5000/cad-atlas:${IMAGE_TAG}" "$DEPLOYMENT" \
            || { echo "✗ image tag patch failed"; exit 1; }
          if git diff --quiet "$DEPLOYMENT"; then
            echo "ℹ image tag unchanged — skipping push"
          else
            git -c user.name="cad-atlas CI" \
                -c user.email="ci@cad-atlas.local" \
                commit -m "chore(deploy): cad-atlas → ${IMAGE_TAG}" "$DEPLOYMENT"
            git push origin main
            echo "✓ pushed to infra repo"
          fi
          shred -u ~/.ssh/id_infra

      - name: Trigger Flux reconcile
        run: |
          kubectl -n flux-system annotate gitrepository flux-system \
            reconcile.fluxcd.io/requestedAt="$(date +%s)" --overwrite
          kubectl -n flux-system annotate kustomization apps \
            reconcile.fluxcd.io/requestedAt="$(date +%s)" --overwrite

      - name: Verify rollout
        run: |
          kubectl rollout status deployment/cad-atlas \
            --namespace cad-atlas \
            --timeout=120s \
          || {
            kubectl get pods -n cad-atlas -o wide
            kubectl get events -n cad-atlas --sort-by='.lastTimestamp' | tail -20
            exit 1
          }