#!/bin/bash
# 起全新登录，立刻测「回调地址」这条路通不通。
#
# 这决定了能不能继续用 cloudflared tunnel login：
#   回调通 -> 授权后 cloudflared 能自己拿到证书，用户啥也不用管
#   回调不通 -> 必须换 Zero Trust 的 tunnel token 方案
set -u

echo "===== 1. 清掉旧会话，起一个全新的登录 ====="
systemctl stop cf-login.service 2>/dev/null || true
systemctl reset-failed cf-login.service 2>/dev/null || true
pkill -f 'cloudflared tunnel login' 2>/dev/null || true
sleep 2
rm -f /root/cf_login.log /root/cf_login_url.txt

systemd-run --unit=cf-login --collect \
    --description="Cloudflare 授权登录" \
    /bin/bash -c "cloudflared tunnel login > /root/cf_login.log 2>&1" \
    > /dev/null 2>&1

URL=""
for i in $(seq 1 20); do
    sleep 2
    URL=$(grep -oE 'https://dash\.cloudflare\.com/argotunnel[^ ]+' /root/cf_login.log 2>/dev/null | head -1)
    [ -n "$URL" ] && break
done

if [ -z "$URL" ]; then
    echo "  ✗ 拿不到授权网址"
    cat /root/cf_login.log
    exit 1
fi
echo "  授权网址:"
echo "    $URL"
echo "$URL" > /root/cf_login_url.txt

CALLBACK=$(echo "$URL" | grep -oE 'callback=[^&]*' | cut -d= -f2-)
DECODED=$(printf '%b' "${CALLBACK//%/\\x}")
echo
echo "  回调地址:"
echo "    $DECODED"

echo
echo "===== 2. 回调主机通不通（未授权状态，应该给个正常 HTTP 码）====="
HOST=$(echo "$DECODED" | sed -E 's#https://([^/]+)/.*#\1#')
echo "  主机: $HOST"
for i in 1 2 3; do
    C=$(timeout 15 curl -4 -s -o /dev/null -w '%{http_code}' "https://$HOST/" 2>/dev/null)
    printf "    第 %d 次: HTTP %s\n" "$i" "${C:-超时}"
    sleep 2
done

echo
echo "===== 3. 带 token 的回调地址（未授权，看给什么）====="
for i in 1 2 3; do
    OUT=$(timeout 20 curl -4 -s -w '\n%{http_code}' "$DECODED" 2>/dev/null)
    CODE=$(echo "$OUT" | tail -1)
    BODY=$(echo "$OUT" | head -1 | cut -c1-80)
    printf "    第 %d 次: HTTP %s  %s\n" "$i" "${CODE:-超时}" "$BODY"
    sleep 2
done

echo
echo "===== 4. DNS / IP ====="
echo "  $HOST 解析到:"
getent ahostsv4 "$HOST" | head -2 | sed 's/^/    /'

echo
echo "===== 5. 结论 ====="
C=$(timeout 15 curl -4 -s -o /dev/null -w '%{http_code}' "https://$HOST/" 2>/dev/null)
if [ "${C:-000}" != "000" ] && [ -n "${C:-}" ]; then
    echo "  回调主机能连上（HTTP $C）"
    echo "  -> cloudflared tunnel login 这条路**可能**能走通"
    echo "     请授权后用 /root/watch_and_setup_tunnel.sh 建隧道"
else
    echo "  回调主机连不上"
    echo "  -> cloudflared tunnel login 这条路在你网络下走不通，"
    echo "     必须改用 Zero Trust 的 tunnel token 方案。"
fi
echo
echo "  授权网址（请打开并授权 xxmxxs.top）："
echo "    $URL"