name: Build

# Documentation-only changes skip this workflow entirely.
#
# A push to master here does not just build - it pushes an image, runs the
# migrations and restarts the demo container, so the site takes a short outage.
# Paying that for a README edit is waste at best; at worst a deploy fails for a
# reason unrelated to anything in the change. Code coverage is unaffected,
# because go.yml still builds every push and pull request.
on:
  push:
    branches: [ master ]
    paths-ignore:
      - '**.md'
      - 'docs/**'
      - 'LICENSE*'
      - '.github/ISSUE_TEMPLATE/**'
  pull_request:
    branches: [ master ]
    paths-ignore:
      - '**.md'
      - 'docs/**'
      - 'LICENSE*'
      - '.github/ISSUE_TEMPLATE/**'

# One deploy at a time. Two merges seconds apart raced here: both runs did
# docker rm -f then docker run, the second removed the container the first had
# just created, and the first's docker run then failed on a name conflict -
# leaving the demo on the older image with a red deploy.
concurrency:
  group: deploy-${{ github.ref }}
  cancel-in-progress: false

env:
  IMAGE_NAME: registry.ap-northeast-1.aliyuncs.com/go-admin/go-admin-api # 镜像名称
  TAG: ${{ github.sha }}
  IMAGE_NAME_TAG: registry.ap-northeast-1.aliyuncs.com/go-admin/go-admin-api:${{ github.sha }}

jobs:

  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1

      - name: Set up Go
        uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7.0.0
        with:
          go-version: 1.26.5

      - name: Tidy
        run: go mod tidy

      - name: Build
        run: env CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build -tags "sqlite3,json1" --ldflags "-extldflags -static" -o main .

      # 以下推镜像与重启步骤仅在 master 收到 push 时执行。
      # pull_request 事件同样会触发本工作流，若不加限制，任何指向 master 的
      # PR 一经创建就会把 PR 分支的镜像推上仓库，并直接重启线上 API 服务，
      # 且发生在合并之前。构建与编译校验不受影响，PR 仍会执行。
      - name: Build the Docker image and push
        if: github.event_name == 'push' && github.ref == 'refs/heads/master'
        run: |
          docker login --username=${{ secrets.DOCKER_USERNAME }} registry.ap-northeast-1.aliyuncs.com --password=${{ secrets.DOCKER_PASSWORD }}
          echo "************ docker login end"
          docker build -t go-admin-api:latest .
          echo "************ docker build end"
          docker tag go-admin-api ${{ env.IMAGE_NAME_TAG }}
          echo "************ docker tag end"
          docker images
          echo "************ docker images end"
          docker push ${{ env.IMAGE_NAME_TAG }}  # 推送
          echo "************ docker push end"

      - name: Restart server   # 第五步，重启服务
        if: github.event_name == 'push' && github.ref == 'refs/heads/master'
        uses: appleboy/ssh-action@0ff4204d59e8e51228ff73bce53f80d53301dee2 # v1.2.5
        env:
          GITHUB_SHA_X: ${GITHUB_SHA}
        with:
          host: ${{ secrets.SSH_HOST }}  # 下面三个配置与上一步类似
          username: ${{ secrets.SSH_USERNAME }}
          key: ${{ secrets.DEPLOY_KEY }}
          # 重启的脚本，根据自身情况做相应改动，一般要做的是migrate数据库以及重启服务器
          #
          # 配置从宿主机挂载，不使用镜像里的那份：演示站连的是托管数据库，
          # 而 config/settings.demo.yml 会随仓库公开、也会打进镜像，凭据不能写在那里。
          # 镜像里那份保持 sqlite，供 clone 仓库的人开箱即用。
          #
          # 路径本身走 secret：它不是凭据，但本仓库公开，没有理由把服务器的
          # 目录结构一并公布。DEMO_CONFIG_PATH 指向宿主机上那份配置。
          #
          # 顺序是有意的：迁移先跑，跑不过就保持现有版本不动；
          # 旧容器改名保留而不是删除，新容器不健康时能原样恢复。
          # 健康检查两条都要过——HTTP 活着不代表数据库通了。
          script: |
            set -u
            CFG="${{ secrets.DEMO_CONFIG_PATH }}"
            IMG="${{ env.IMAGE_NAME_TAG }}"
            NAME=go-admin-api
            PREV="$NAME-prev"

            test -f "$CFG" || { echo "宿主机配置缺失，中止部署"; exit 1; }

            sudo docker login --username=${{ secrets.DOCKER_USERNAME }} registry.ap-northeast-1.aliyuncs.com --password=${{ secrets.DOCKER_PASSWORD }}
            sudo docker pull "$IMG" || { echo "拉取镜像失败，中止部署"; exit 1; }

            # 迁移用新镜像跑。失败时线上仍是旧版本配旧 schema，是自洽的；
            # 硬切过去才会得到代码与表对不上的服务。
            if ! sudo docker run --rm -v "$CFG":/config/settings.yml:ro "$IMG" \
                 /main migrate -c /config/settings.yml; then
              echo "迁移失败，保持现有版本"; exit 1
            fi

            if sudo docker ps -a --format '{{.Names}}' | grep -qx "$NAME"; then
              sudo docker rm -f "$PREV" >/dev/null 2>&1 || true
              sudo docker rename "$NAME" "$PREV"
              sudo docker stop "$PREV" >/dev/null
            fi

            sudo docker run -d -p 8000:8000 \
              -v "$CFG":/config/settings.yml:ro \
              --name "$NAME" "$IMG"

            ok=0
            for i in $(seq 1 20); do
              sleep 3
              code=$(curl -s -o /dev/null -w '%{http_code}' -m 5 http://127.0.0.1:8000/api/v1/captcha 2>/dev/null || true)
              if [ "$code" = "200" ] && sudo docker logs "$NAME" 2>&1 | grep -q 'connect success'; then
                ok=1; echo "健康检查通过（第 $i 次探测）"; break
              fi
            done

            if [ "$ok" = "1" ]; then
              sudo docker rm -f "$PREV" >/dev/null 2>&1 || true
            else
              echo "健康检查失败，回滚到上一版本"
              sudo docker logs --tail 40 "$NAME" 2>&1 || true
              sudo docker rm -f "$NAME" >/dev/null 2>&1 || true
              if sudo docker ps -a --format '{{.Names}}' | grep -qx "$PREV"; then
                sudo docker rename "$PREV" "$NAME"
                sudo docker start "$NAME" >/dev/null
                echo "已恢复"
              fi
              exit 1
            fi