name: Deploy to Frontend Servers

on:
  push:
    branches:
      - main

jobs:
  deploy:
    runs-on: self-hosted

    steps:
      - name: Free disk space
        run: |
          set +e
          echo "=== Disk before cleanup ==="
          df -h
          # Identify the directory holding the currently-running act job so we
          # never touch it. Everything else under ~/.cache/act/ is fair game.
          CURRENT_ACT_DIR=""
          if [ -n "${ACT_TOOLCACHE_PATH:-}" ]; then
            CURRENT_ACT_DIR=$(dirname "${ACT_TOOLCACHE_PATH}" 2>/dev/null)
          fi
          if [ -z "$CURRENT_ACT_DIR" ]; then
            CURRENT_ACT_DIR=$(pwd | sed -n 's|\(.*/.cache/act/[^/]*\).*|\1|p')
          fi
          echo "Current act dir (preserved): ${CURRENT_ACT_DIR:-<unknown>}"
          # Wipe every other act workspace immediately (no mtime threshold).
          # The old 10min threshold still left the previous failed job around,
          # which then ate the disk before `npm ci` could finish.
          if [ -d "$HOME/.cache/act" ]; then
            du -sh "$HOME/.cache/act" 2>/dev/null
            for d in "$HOME/.cache/act"/*/; do
              [ -d "$d" ] || continue
              case "$d" in
                "$CURRENT_ACT_DIR"/*|"$CURRENT_ACT_DIR/") echo "skip current: $d" ;;
                *) rm -rf "$d" && echo "removed: $d" ;;
              esac
            done
          fi
          # npm cache + setup-node cache: blow them away entirely. `npm ci`
          # re-populates what it needs; the cache is a nice-to-have, not a
          # requirement, and on a tight runner it's the easiest GB to reclaim.
          rm -rf "$HOME/.npm/_cacache" "$HOME/.npm/_logs" 2>/dev/null
          rm -rf "$HOME/.cache/setup-node" 2>/dev/null
          # Stale actions-runner workspaces older than 30min.
          if [ -d "$HOME/actions-runner/_work" ]; then
            find "$HOME/actions-runner/_work" -mindepth 1 -maxdepth 2 -mmin +30 -exec rm -rf {} + 2>/dev/null
          fi
          # Docker: drop everything reclaimable (no `until` filter).
          if command -v docker >/dev/null 2>&1; then
            docker system prune -af --volumes 2>/dev/null
          fi
          # Stale /tmp files older than 2h, keep currently-running runner files.
          find /tmp -mindepth 1 -maxdepth 1 -mmin +120 \
            -not -name 'runner*' -not -name 'act*' \
            -exec rm -rf {} + 2>/dev/null
          echo "=== Disk after cleanup ==="
          df -h
          # Hard fail early if there still isn't enough room for `npm ci`,
          # which needs ~3GB for this codebase's hoisted node_modules.
          AVAIL_MB=$(df -Pm . | awk 'NR==2 {print $4}')
          echo "Available on workspace volume: ${AVAIL_MB} MB"
          if [ "${AVAIL_MB:-0}" -lt 3500 ]; then
            echo "::error::Less than 3.5GB free after cleanup (${AVAIL_MB}MB)."
            echo "The runner's EBS volume is too small for this codebase \
          — ask devops to expand it. Failing fast so the next steps don't \
          half-write an unusable build."
            exit 1
          fi
          exit 0

      - name: Checkout code
        uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: "22"
          cache: npm

      - name: Install dependencies
        run: npm ci

      - name: Type check
        run: npx tsc --noEmit

      - name: Format check
        run: npm run format:check

      - name: Test
        run: npm test

      - name: Ensure free space before build
        run: |
          # Second-pass guard right before the heaviest step. `npm ci` plus
          # tsc/test pull in tons of files since the first cleanup ran, and
          # vite chunk writes need at least a few GB free — ENOSPC here is what
          # killed past runs.
          set +e
          AVAIL_MB=$(df -Pm . | awk 'NR==2 {print $4}')
          echo "Available on workspace volume: ${AVAIL_MB} MB"
          if [ "${AVAIL_MB:-0}" -lt 3072 ]; then
            echo "<3GB free — running an aggressive cleanup before build."
            rm -rf "$HOME/.cache/act"/*/hostexecutor/node_modules/.cache 2>/dev/null
            rm -rf "$HOME/.npm/_cacache" 2>/dev/null
            if command -v docker >/dev/null 2>&1; then
              docker system prune -af --volumes 2>/dev/null
            fi
            df -h
          fi
          exit 0

      - name: Build
        run: npm run build
        env:
          VITE_API_URL: ""
          VITE_API_PREFIX: "/apnew"
          VITE_DISABLE_ADMIN: "true"

      - name: Setup SSH key
        run: |
          mkdir -p ~/.ssh
          echo "${{ secrets.DEPLOY_KEY }}" > ~/.ssh/deploy_key
          chmod 600 ~/.ssh/deploy_key
          ssh-keyscan -H ${{ secrets.FRONTEND_1_HOST }} >> ~/.ssh/known_hosts 2>/dev/null
          ssh-keyscan -H ${{ secrets.FRONTEND_2_HOST }} >> ~/.ssh/known_hosts 2>/dev/null

      - name: Deploy to both servers
        run: |
          set -euo pipefail
          deploy_to() {
            local HOST=$1
            echo ">>> 部署到 $HOST"
            rsync -avz --delete \
              -e "ssh -i ~/.ssh/deploy_key -o StrictHostKeyChecking=no" \
              dist/ \
              ec2-user@${HOST}:/var/www/ark-library/
            echo ">>> $HOST 部署完成"
          }
          deploy_to "${{ secrets.FRONTEND_1_HOST }}" &
          PID1=$!
          deploy_to "${{ secrets.FRONTEND_2_HOST }}" &
          PID2=$!
          FAIL=0
          wait $PID1 || { echo "ERROR: frontend-1 部署失败"; FAIL=1; }
          wait $PID2 || { echo "ERROR: frontend-2 部署失败"; FAIL=1; }
          [ $FAIL -eq 0 ] || exit 1
          echo "=== 两台都部署完成 ==="

      - name: Verify both servers match local build
        run: |
          set -euo pipefail
          LOCAL=$(sha256sum dist/index.html | awk '{print $1}')
          SUM1=$(ssh -i ~/.ssh/deploy_key -o StrictHostKeyChecking=no \
            ec2-user@${{ secrets.FRONTEND_1_HOST }} \
            "sha256sum /var/www/ark-library/index.html | awk '{print \$1}'")
          SUM2=$(ssh -i ~/.ssh/deploy_key -o StrictHostKeyChecking=no \
            ec2-user@${{ secrets.FRONTEND_2_HOST }} \
            "sha256sum /var/www/ark-library/index.html | awk '{print \$1}'")
          echo "local:      $LOCAL"
          echo "frontend-1: $SUM1"
          echo "frontend-2: $SUM2"
          if [ "$SUM1" != "$LOCAL" ]; then
            echo "ERROR: frontend-1 不是本次构建的版本"
            exit 1
          fi
          if [ "$SUM2" != "$LOCAL" ]; then
            echo "ERROR: frontend-2 不是本次构建的版本"
            exit 1
          fi
          echo "✓ 两台都已经更新到本次构建的版本。"

      - name: Cleanup SSH key
        if: always()
        run: rm -f ~/.ssh/deploy_key