name: lpt-be Build & Deploy

on:
  workflow_dispatch:
    inputs:
      environment:
        description: '部署环境（dev 仅允许 dev 分支；prod 仅允许 master/main）'
        required: true
        type: choice
        options:
          - dev
          - prod

env:
  REGISTRY: 192.168.123.199:5000
  APP: lpt-be
  REPO_URL: http://git.cat-shark.xyz/cat-shark/lpt-be.git

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest
    env:
      KUBECONFIG: /tmp/kubeconfig
    steps:
      - name: Validate branch ↔ environment
        run: |
          set -euo pipefail
          REF="${{ gitea.ref }}"
          BRANCH="${REF#refs/heads/}"
          if [[ "$REF" == refs/tags/* ]]; then
            echo "ERROR: 请从分支触发部署，不要用 tag。当前 ref=$REF"
            exit 1
          fi
          ENV="${{ inputs.environment }}"
          echo "branch=$BRANCH environment=$ENV sha=${{ gitea.sha }}"
          case "$ENV" in
            prod)
              case "$BRANCH" in
                master|main) echo "OK: prod 允许从 $BRANCH 部署" ;;
                *)
                  echo "ERROR: prod 只能从 master/main 部署，当前分支是 '$BRANCH'"
                  echo "请切换到 master 后再 Run workflow，并选择 environment=prod"
                  exit 1
                  ;;
              esac
              ;;
            dev)
              case "$BRANCH" in
                dev) echo "OK: dev 允许从 $BRANCH 部署" ;;
                *)
                  echo "ERROR: dev 只能从 dev 分支部署，当前分支是 '$BRANCH'"
                  echo "请切换到 dev 后再 Run workflow，并选择 environment=dev"
                  echo "（禁止用 master 代码部署到 lpt-dev，避免环境错配）"
                  exit 1
                  ;;
              esac
              ;;
            *)
              echo "ERROR: 未知 environment=$ENV"
              exit 1
              ;;
          esac

      - name: Checkout code
        run: |
          set -euo pipefail
          git clone "$REPO_URL" .
          git checkout "${{ gitea.sha }}"

      - name: Login to Docker Registry
        run: |
          set -euo pipefail
          echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login "$REGISTRY" -u "${{ secrets.REGISTRY_USERNAME }}" --password-stdin

      - name: Build & Push Docker image
        run: |
          set -euo pipefail
          ENV="${{ inputs.environment }}"
          TAG="${{ gitea.sha }}-$(date +%s)"
          echo "Building $REGISTRY/$APP:$TAG (env tag=$ENV)"
          docker build -t "$REGISTRY/$APP:$TAG" -t "$REGISTRY/$APP:$ENV" .
          docker push "$REGISTRY/$APP:$TAG"
          docker push "$REGISTRY/$APP:$ENV"
          echo "IMAGE_TAG=$TAG"
          echo "$TAG" > image_tag.txt
          mkdir -p /tmp/lpt-ci
          echo "$TAG" > /tmp/lpt-ci/image_tag.txt

      - name: Setup kubectl
        run: |
          set -euo pipefail
          curl -sLO "https://dl.k8s.io/release/v1.30.0/bin/linux/amd64/kubectl"
          chmod +x kubectl
          mv kubectl /usr/local/bin/
          echo "${{ secrets.KUBECONFIG_B64 }}" | base64 -d > /tmp/kubeconfig
          chmod 600 /tmp/kubeconfig

      - name: Create/Update imagePullSecret
        run: |
          set -euo pipefail
          kubectl create secret docker-registry regcred \
            --docker-server="$REGISTRY" \
            --docker-username="${{ secrets.REGISTRY_USERNAME }}" \
            --docker-password="${{ secrets.REGISTRY_PASSWORD }}" \
            -n "lpt-${{ inputs.environment }}" \
            --dry-run=client -o yaml | kubectl apply -f -

      - name: Deploy to K8s
        run: |
          set -euo pipefail
          ENV="${{ inputs.environment }}"
          IMAGE_TAG="$(cat image_tag.txt 2>/dev/null || cat /tmp/lpt-ci/image_tag.txt 2>/dev/null || echo '')"
          if [ -z "$IMAGE_TAG" ]; then
            echo "ERROR: IMAGE_TAG 为空，无法部署"
            exit 1
          fi
          echo "Deploying $REGISTRY/$APP:$IMAGE_TAG -> namespace lpt-$ENV"
          kubectl set image "deployment/$APP" \
            "$APP=$REGISTRY/$APP:$IMAGE_TAG" \
            -n "lpt-$ENV" --record
          kubectl rollout status "deployment/$APP" \
            -n "lpt-$ENV" --timeout=5m

      - name: Debug on failure
        if: failure()
        run: |
          ENV="${{ inputs.environment }}"
          echo "=== Deployment Status ==="
          kubectl get deployment "$APP" -n "lpt-$ENV" || true
          echo ""
          echo "=== Pod Status ==="
          kubectl get pods -n "lpt-$ENV" -l "app=$APP" || true
          echo ""
          echo "=== Recent Events ==="
          kubectl get events -n "lpt-$ENV" --sort-by='.lastTimestamp' | tail -20 || true
          echo ""
          echo "=== Pod Describe (latest) ==="
          POD=$(kubectl get pods -n "lpt-$ENV" -l "app=$APP" --sort-by=.metadata.creationTimestamp -o jsonpath='{.items[-1].metadata.name}' 2>/dev/null || true)
          if [ -n "${POD:-}" ]; then
            kubectl describe pod "$POD" -n "lpt-$ENV" || true
            echo ""
            echo "=== Pod Logs (latest) ==="
            kubectl logs "$POD" -n "lpt-$ENV" --tail=50 || true
          fi

      - name: Rollback on failure
        if: failure()
        run: |
          set -euo pipefail
          ENV="${{ inputs.environment }}"
          kubectl rollout undo "deployment/$APP" -n "lpt-$ENV" || true
          kubectl rollout status "deployment/$APP" -n "lpt-$ENV" || true