#!/usr/bin/env bash
# 切换 B 步（在 47 上跑）：加 systemd drop-in → 重启 dshs（= 切换时刻，约 1-2 秒中断）
#   · 用 drop-in 而非改 unit：unit 本体 hash 不变 ⇒ 回滚只需删 drop-in
#   · 同时把 106 的 worker lib 也更新到同一版本（两侧代码必须一致）
set -uo pipefail
mkdir -p /etc/systemd/system/dshs.service.d
cat > /etc/systemd/system/dshs.service.d/cluster.conf <<CONF
# T08 集群化（2026-09-15）：Manager 在 47、实例落在 w-47（既有用户）/ w-106（新用户）
# 回滚：删除本文件 → systemctl daemon-reload → systemctl restart dshs
[Service]
Environment="DSHS_DEPLOY_MODE=cluster"
Environment="DSHS_DB_URL=postgres://dshs:dshs_cluster_2026@127.0.0.1:15432/dshs"
Environment="DSHS_CLUSTER_HOST_ID=w-47"
Environment="DSHS_CLUSTER_AGENT_URL=http://127.0.0.1:19100"
Environment="DSHS_CLUSTER_AGENT_TOKEN=dshs-worker-47-c4b7e19f"
Environment="DSHS_CLUSTER_INSTANCE_HOST=127.0.0.1"
Environment="DSHS_CLUSTER_WORKER_DATA_ROOT=/var/lib/dshs"
Environment="DSHS_CLUSTER_CAPACITY_MB=-1"
Environment="DSHS_CLUSTER_REGISTER_SELF=0"
Environment="DSHS_CLUSTER_LEASE_TTL_MS=30000"
CONF
echo "  ✓ drop-in 已写（$(wc -l < /etc/systemd/system/dshs.service.d/cluster.conf) 行）"

systemctl daemon-reload
systemctl restart dshs
sleep 6

echo "=== 切换后自检 ==="
echo "  dshs=$(systemctl is-active dshs) ｜ dshs-pg=$(systemctl is-active dshs-pg) ｜ dshs-worker=$(systemctl is-active dshs-worker)"
echo "  生效 env（systemd 解析后）:"
systemctl show dshs -p Environment 2>/dev/null | tr ' ' '\n' | grep -E "DEPLOY_MODE|CLUSTER_HOST_ID|CLUSTER_AGENT_URL|DB_URL" | sed 's/^/    /'
echo "  门户: login.html=$(curl -s -o /dev/null -w '%{http_code}' -m 8 http://127.0.0.1:3080/login.html)"
echo "  公网: https://alotbuy.com/login.html = $(curl -s -o /dev/null -w '%{http_code}' -m 12 https://alotbuy.com/login.html)"
echo "  --- dshs cluster status ---"
cd /opt/dshs && set -a && . /etc/dshs.env && set +a && set -a && . /etc/systemd/system/dshs.service.d/cluster.conf 2>/dev/null || true
cd /opt/dshs && DSHS_DB_URL="postgres://dshs:dshs_cluster_2026@127.0.0.1:15432/dshs" node lib/cli.js cluster status 2>&1 | head -8 | sed 's/^/  /'
echo "  --- 回滚命令（随时可用） ---"
echo "    rm -f /etc/systemd/system/dshs.service.d/cluster.conf && systemctl daemon-reload && systemctl restart dshs"