local MIN_DBM, MAX_DBM = -90, -20
local COLOR_DIM = '#709080'

local function clamp(x, lo, hi)
  if x < lo then return lo end
  if x > hi then return hi end
  return x
end

local function make_wifi_level(dbm)
  dbm = clamp(dbm, MIN_DBM, MAX_DBM)

  -- Normalize to [0, 1]
  local t = (dbm - MIN_DBM) / (MAX_DBM - MIN_DBM)

  local level
  if t < 0.25 then
    level = '󰢿'
  elseif t < 0.50 then
    level = '󰢼'
  elseif t < 0.75 then
    level = '󰢽'
  else
    level = '󰢾'
  end

  return {
    full_text = level,
    color = COLOR_DIM,
  }
end

widget = {
  plugin = 'network-linux',
  opts = {
    wireless = true,
    timeout = 10,
  },
  cb = function(t)
    if not t then
      return nil
    end
    local r = {}
    for iface, params in pairs(t) do
      if params.wireless then
        if params.wireless.ssid then
          r[#r + 1] = {
            full_text = params.wireless.ssid,
            color = COLOR_DIM,
          }
        end
        if params.wireless.signal_dbm then
          r[#r + 1] = make_wifi_level(params.wireless.signal_dbm)
        end
      elseif iface ~= 'lo' and (params.ipv4 or params.ipv6) then
        r[#r + 1] = {
          full_text = string.format('[%s]', iface),
          color = COLOR_DIM,
        }
      end
    end
    return r
  end,
  event = [[
        local t = ...
        if t.button == 1 then
            os.execute('~/.local/bin/rofi-wifimenu &')
        end
    ]],
}