local buffers = require("nvim-tree.buffers")

local HL_POSITION = require("nvim-tree.enum").HL_POSITION
local ICON_PLACEMENT = require("nvim-tree.enum").ICON_PLACEMENT

local Decorator = require("nvim-tree.renderer.decorator")

---@class (exact) DecoratorOpened: Decorator
---@field icon HighlightedString|nil
local DecoratorOpened = Decorator:extend()

---@class DecoratorOpened
---@overload fun(explorer: DecoratorArgs): DecoratorOpened

---@private
---@param args DecoratorArgs
function DecoratorOpened:new(args)
  Decorator.new(self, {
    explorer       = args.explorer,
    enabled        = true,
    hl_pos         = HL_POSITION[args.explorer.opts.renderer.highlight_opened_files] or HL_POSITION.none,
    icon_placement = ICON_PLACEMENT.none,
  })
end

---Opened highlight: renderer.highlight_opened_files and node has an open buffer
---@param node Node
---@return string|nil group
function DecoratorOpened:calculate_highlight(node)
  if self.hl_pos ~= HL_POSITION.none and buffers.is_opened(node) then
    return "NvimTreeOpenedHL"
  end
end

return DecoratorOpened