#!/bin/bash
# 把隧道从 QUIC 换成 HTTP/2。
#
# 日志里的证据：
#   WRN Failed to dial a quic connection error="failed to dial to edge with quic:
#       timeout: no recent network activity"
#   WRN Connection terminated error="datagram manager error: timeout"
#
# QUIC 走 UDP，这条 4G 线路对 UDP 明显不友好（一直超时重连）。
# 而 cloudflared 自己的自检结果是 suggested_protocol=http2。
#
# 换成 HTTP/2（走 TCP 443，和普通 HTTPS 一样）应该稳得多。
set -u

RELAY_DIR=/root/lanremote-relay
HOSTNAME_FULL=relay.xxmxxs.top
TUNNEL_NAME=lanremote

echo "===== 1. 改之前 ====="
systemctl is-active lanremote-tunnel
grep -c 'quic' "$RELAY_DIR/tunnel.log" 2>/dev/null || echo 0
echo "  ↑ 日志里出现 quic 的次数"

echo
echo "===== 2. 看看当前 service 长什么样 ====="
grep ExecStart /etc/systemd/system/lanremote-tunnel.service | sed 's/^/  /'

echo
echo "===== 3. 改成 --protocol http2 ====="
python3 - <<'PY'
from pathlib import Path

unit = Path("/etc/systemd/system/lanremote-tunnel.service")
text = unit.read_text()
if "--protocol http2" in text:
    print("  已经是 http2 了")
else:
    # 在 --edge-ip-version 4 后面插入 --protocol http2
    text = text.replace("--edge-ip-version 4",
                        "--edge-ip-version 4 --protocol http2")
    unit.write_text(text)
    print("  已插入 --protocol http2")
    for line in text.splitlines():
        if line.startswith("ExecStart"):
            print("  " + line)
PY

echo
echo "===== 4. 重启并观察 ====="
systemctl daemon-reload
systemctl restart lanremote-tunnel
rm -f "$RELAY_DIR/tunnel.log"
sleep 25

echo "  服务: $(systemctl is-active lanremote-tunnel)"
echo
echo "  日志："
tail -8 "$RELAY_DIR/tunnel.log" 2>/dev/null | sed 's/^/    /'

echo
echo "===== 5. 验证连通性（连打 6 次）====="
OK=0
for i in $(seq 1 6); do
    C=$(timeout 20 curl -4 -s -o /dev/null -w '%{http_code}' \
        -H 'User-Agent: LanRemote/1.4.0' \
        "https://$HOSTNAME_FULL/v1/health" 2>/dev/null)
    printf "    第 %d 次: HTTP %s\n" "$i" "${C:-超时}"
    [ "$C" = "200" ] && OK=$((OK + 1))
    sleep 4
done

echo
echo "  成功 $OK / 6 次"
if [ "$OK" -ge 5 ]; then
    echo "  ✓ HTTP/2 明显更稳"
elif [ "$OK" -ge 1 ]; then
    echo "  ~ 时好时坏"
else
    echo "  ✗ 还是不通"
fi

echo
echo "  现在用的协议："
grep -oE 'protocol=[a-z0-9]+' "$RELAY_DIR/tunnel.log" 2>/dev/null | sort -u | sed 's/^/    /'