local constants = require 'constants'
local settings = require 'config.settings'

local maxItems <const> = 15
local menuItems = {}
local isShowingMenu = false

local frontAppWatcher = sbar.add('item', {
  drawing = false,
  updates = true,
})

local swapWatcher = sbar.add('item', {
  drawing = false,
  updates = true,
})

local function createPlaceholders()
  for index = 1, maxItems, 1 do
    local menu = sbar.add('item', constants.items.MENU .. '.' .. index, {
      drawing = false,
      icon = { drawing = false },
      width = 'dynamic',
      label = {
        font = {
          style = index == 1 and settings.fonts.styles.bold or settings.fonts.styles.regular,
        },
      },
      click_script = 'sk-menus -s ' .. index,
    })
    menuItems[index] = menu
  end

  sbar.add('bracket', { '/' .. constants.items.MENU .. '\\..*/' }, {
    background = {
      color = settings.colors.bg1,
      padding_left = settings.dimens.padding.item,
      padding_right = settings.dimens.padding.item,
    },
  })
end

local function updateMenus()
  sbar.set('/' .. constants.items.MENU .. '\\..*/', { drawing = false })

  sbar.exec('sk-menus -l', function(menus)
    local index = 1
    for menu in string.gmatch(menus, '[^\r\n]+') do
      if index < maxItems then
        menuItems[index]:set {
          width = 'dynamic',
          label = menu,
          drawing = isShowingMenu,
        }
      else
        break
      end
      index = index + 1
    end
  end)

  sbar.set(constants.items.MENU .. '.padding', { drawing = isShowingMenu })
end

frontAppWatcher:subscribe(constants.events.FRONT_APP_SWITCHED, updateMenus)

swapWatcher:subscribe(constants.events.SWAP_MENU_AND_SPACES, function(env)
  isShowingMenu = env.isShowingMenu == 'on'
  updateMenus()
end)

createPlaceholders()