#!/bin/bash
# 反复重启隧道，直到拿到一个能用的地址。
#
# 背景：这条线路对 api.trycloudflare.com（Cloudflare 真实 IP）TCP 握手超时，
# 所以匿名隧道时好时坏。多重试几次通常能碰上一次成功的。
set -u

URL_FILE=/root/lanremote-relay/public_url.txt

for attempt in 1 2 3 4 5; do
    echo "===== 第 $attempt 次尝试 ====="
    systemctl restart lanremote-tunnel
    rm -f "$URL_FILE"

    URL=""
    for i in $(seq 1 30); do
        sleep 3
        URL=$(cat "$URL_FILE" 2>/dev/null || echo "")
        [ -n "$URL" ] && break
    done

    if [ -z "$URL" ]; then
        echo "  60 秒没拿到地址，看日志："
        tail -2 /root/lanremote-relay/tunnel.log 2>/dev/null | sed 's/^/    /'
        continue
    fi

    echo "  拿到地址: $URL"
    for j in 1 2 3; do
        C=$(timeout 15 curl -s -o /dev/null -w '%{http_code}' "$URL/v1/health" 2>/dev/null)
        printf "    验证第 %d 次: HTTP %s\n" "$j" "${C:-超时}"
        if [ "$C" = "200" ]; then
            echo
            echo "  ✓ 可用！"
            echo "$URL" > "$URL_FILE"
            exit 0
        fi
        sleep 5
    done
    echo "  地址拿到了但访问不通"
done

echo
echo "  ✗ 5 次都没成功"
echo "  这正是必须用具名隧道的原因 —— 匿名隧道在这条线路上不可靠。"
echo
echo "  当前仍然可用的入口（局域网）："
echo "    http://192.168.2.156:8080/url"
exit 1