#!/bin/bash
# 切到 B 组（quic6 + h2 4）并起 75 分钟测量。
#
# 为什么 75 分钟而不是 45：
#   A 组的 45 分钟新鲜数据里**一次塌陷都没抓到**（塌陷率约 2.2%，
#   45 分钟窗口的命中概率只有约 60%）。拉长到 75 分钟把概率提到 ~80%。
#
# 注意：这次改配置会重启两个隧道实例（约 26 秒不可用），
# 用户可能在用手表，所以**一次改到位**，跑完立刻恢复成 A。
set -u

MAIN=/etc/systemd/system/lanremote-tunnel.service
H2=/etc/systemd/system/lanremote-tunnel-h2.service
BAK=/root/ratio2.bak.$(date +%s)
cp -a "$MAIN" "$BAK.main"
cp -a "$H2" "$BAK.h2"

echo "════════ 1. 等 A 组跑完 ════════"
for i in $(seq 1 40); do
    if ! pgrep -f 'rpab.sh A' > /dev/null 2>&1; then
        echo "  A 组已结束"
        break
    fi
    sleep 10
done
pgrep -af 'rpab.sh' | sed 's/^/  还在跑: /' || echo "  没有测试在跑"

echo
echo "════════ 2. 切到 B 组：quic 6 + http2 4 ════════"
sed -i 's/--ha-connections [0-9]*/--ha-connections 6/' "$MAIN"
sed -i 's/--ha-connections [0-9]*/--ha-connections 4/' "$H2"
systemctl daemon-reload
systemctl restart lanremote-tunnel
sleep 2
systemctl restart lanremote-tunnel-h2
echo "  主: $(grep -oE '\-\-protocol [a-z0-9]+|\-\-ha-connections [0-9]+' "$MAIN" | tr '\n' ' ')"
echo "  副: $(grep -oE '\-\-protocol [a-z0-9]+|\-\-ha-connections [0-9]+' "$H2" | tr '\n' ' ')"

echo
echo "════════ 3. 等连接建齐 ════════"
for i in $(seq 1 40); do
    sleep 4
    q=$(curl -s --max-time 5 http://127.0.0.1:20241/metrics 2>/dev/null | grep '^cloudflared_tunnel_ha_connections' | awk '{print $2}')
    h=$(curl -s --max-time 5 http://127.0.0.1:20242/metrics 2>/dev/null | grep '^cloudflared_tunnel_ha_connections' | awk '{print $2}')
    q=${q:-0}; h=${h:-0}
    [ $((q + h)) -ge 8 ] && break
done
echo "  quic=$q  http2=$h  合计=$((q + h))（等了约 $((i * 4)) 秒）"

echo
echo "════════ 4. 公网确认 ════════"
for i in $(seq 1 15); do
    c=$(curl -s -o /dev/null -w '%{http_code}' --max-time 15 -H 'User-Agent: LanRemote/1.8.2' https://relay.xxmxxs.top/v1/health)
    echo "  第 $i 次: $c"
    [ "$c" = "200" ] && break
    sleep 3
done

echo
echo "════════ 5. 起 B 组 75 分钟 ════════"
if pgrep -f 'rpab.sh B' > /dev/null 2>&1; then
    echo "  已经在跑，跳过"
else
    cd /root && setsid bash /root/rpab.sh B 75 < /dev/null > /root/ab_B.out 2>&1 &
    disown 2>/dev/null || true
    sleep 5
fi
echo "  进程: $(pgrep -af 'rpab.sh B' | head -1)"
echo "  已写入：$(wc -l < /root/ab_B_health.tsv 2>/dev/null || echo 0) 条"
echo
echo "  备份: $BAK.main  $BAK.h2"
echo "  跑完后用 /root/rp_restore_A.sh 恢复成 quic8+h2 2"