#!/bin/bash
# 随身 WiFi（4G 设备）空间体检
set -u

echo "════════ 1. 磁盘总览 ════════"
df -h / 2>/dev/null | sed 's/^/  /'
echo
echo "  根分区占用明细（前 20 大目录）:"
du -xhd1 / 2>/dev/null | sort -rh | head -20 | sed 's/^/    /'

echo
echo "════════ 2. /root 下明细 ════════"
du -xhd1 /root 2>/dev/null | sort -rh | head -15 | sed 's/^/  /'

echo
echo "════════ 3. /var 下明细 ════════"
du -xhd1 /var 2>/dev/null | sort -rh | head -12 | sed 's/^/  /'

echo
echo "════════ 4. 日志和缓存（最容易清理的）════════"
for d in /var/log /var/cache/apt /var/lib/apt/lists /tmp /root/.cache; do
    [ -d "$d" ] && printf "  %-28s %s\n" "$d" "$(du -sh "$d" 2>/dev/null | awk '{print $1}')"
done
echo
echo "  journald 日志占用:"
journalctl --disk-usage 2>/dev/null | sed 's/^/    /'

echo
echo "════════ 5. 中转相关文件 ════════"
du -sh /root/lanremote-relay 2>/dev/null | sed 's/^/  /'
du -sh /root/lanremote-relay/downloads 2>/dev/null | sed 's/^/    downloads: /'
ls -la /root/lanremote-relay/downloads/ 2>/dev/null | sed 's/^/    /'
echo "  日志文件:"
ls -lah /root/lanremote-relay/*.log 2>/dev/null | awk '{printf "    %-42s %s\n", $9, $5}'

echo
echo "════════ 6. 我调试时留下的临时文件（_build 上传的脚本）════════"
du -sh /root/*.sh /root/*.py 2>/dev/null | sort -rh | head -20 | sed 's/^/  /'
echo "  /root 下的零散文件总数: $(ls -1 /root 2>/dev/null | wc -l)"

echo
echo "════════ 7. 内存和 swap ════════"
free -m | sed 's/^/  /'
echo
echo "  swap 分区情况:"
swapon --show 2>/dev/null | sed 's/^/    /' || echo "    没有启用 swap"

echo
echo "════════ 8. 最大的 20 个文件（全盘）════════"
find / -xdev -type f -size +3M 2>/dev/null -printf '%s %p\n' \
    | sort -rn | head -20 \
    | awk '{printf "  %8.1f MB  %s\n", $1/1048576, $2}'