local events = require "nvim-tree.events"
local explorer = require "nvim-tree.explorer"
local view = require "nvim-tree.view"
local log = require "nvim-tree.log"

local M = {}

---@type Explorer|nil
local TreeExplorer = nil
local first_init_done = false

---@param foldername string
function M.init(foldername)
  local profile = log.profile_start("core init %s", foldername)

  if TreeExplorer then
    TreeExplorer:destroy()
  end
  TreeExplorer = explorer.Explorer.new(foldername)
  if not first_init_done then
    events._dispatch_ready()
    first_init_done = true
  end
  log.profile_end(profile)
end

---@return Explorer|nil
function M.get_explorer()
  return TreeExplorer
end

function M.reset_explorer()
  TreeExplorer = nil
end

---@return string|nil
function M.get_cwd()
  return TreeExplorer and TreeExplorer.absolute_path
end

---@return integer
function M.get_nodes_starting_line()
  local offset = 1
  if view.is_root_folder_visible(M.get_cwd()) then
    offset = offset + 1
  end
  if TreeExplorer and TreeExplorer.live_filter.filter then
    return offset + 1
  end
  return offset
end

return M