#!/usr/bin/lua
-- Copyright (C) 2022 Tianling Shen <cnsztl@immortalwrt.org>

local util = require "luci.util"
local jsonc = require "luci.jsonc"

local eth_info = {}
local ifname, stat
for ifname, stat in pairs(util.ubus("network.device", "status")) do
    if ifname:match("^(eth%d+)$") == ifname or ifname:match("^(usb%d+)$") or ifname:match("^(lan%d+)$") == ifname then
        local status, speed, duplex

        status = stat.carrier and "yes" or "no"

        if status == "yes" and stat.speed == nil then
            speed = "-"
        elseif stat.speed == nil or stat.speed:sub(1, 1) == "-" then
            speed = "-"
        else
            speed = stat.speed:sub(1, -2) .. "Mb/s"
        end

        if not stat.carrier then
            duplex = "-"
        elseif stat.speed == nil then
            duplex = "-"
        elseif stat.speed:sub(-1) == "F" then
            duplex = "Full"
        else
            duplex = "Half"
        end

        eth_info[#eth_info + 1] = {
            name = ifname,
            status = status,
            speed = speed,
            duplex = duplex
        }
    end
end

table.sort(
    eth_info,
    function(a, b)
        return a.name < b.name
    end
)

print(jsonc.stringify(eth_info))