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")
local DirectoryNode = require("nvim-tree.node.directory")

---@class (exact) DecoratorHidden: Decorator
---@field icon HighlightedString?
local DecoratorHidden = Decorator:extend()

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

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

  if self.explorer.opts.renderer.icons.show.hidden then
    self.icon = {
      str = self.explorer.opts.renderer.icons.glyphs.hidden,
      hl = { "NvimTreeHiddenIcon" },
    }
    self:define_sign(self.icon)
  end
end

---Hidden icon: renderer.icons.show.hidden and node starts with `.` (dotfile).
---@param node Node
---@return HighlightedString[]|nil icons
function DecoratorHidden:calculate_icons(node)
  if self.enabled and node:is_dotfile() then
    return { self.icon }
  end
end

---Hidden highlight: renderer.highlight_hidden and node starts with `.` (dotfile).
---@param node Node
---@return string|nil group
function DecoratorHidden:calculate_highlight(node)
  if not self.enabled or self.hl_pos == HL_POSITION.none or not node:is_dotfile() then
    return nil
  end

  if node:is(DirectoryNode) then
    return "NvimTreeHiddenFolderHL"
  else
    return "NvimTreeHiddenFileHL"
  end
end

return DecoratorHidden