local utils = require "nvim-tree.utils"
local events = require "nvim-tree.events"
local view = require "nvim-tree.view"
local lib = require "nvim-tree.lib"
local notify = require "nvim-tree.notify"

local M = {
  config = {},
}

local function close_windows(windows)
  if view.View.float.enable and #vim.api.nvim_list_wins() == 1 then
    return
  end

  for _, window in ipairs(windows) do
    if vim.api.nvim_win_is_valid(window) then
      vim.api.nvim_win_close(window, true)
    end
  end
end

local function clear_buffer(absolute_path)
  local bufs = vim.fn.getbufinfo { bufloaded = 1, buflisted = 1 }
  for _, buf in pairs(bufs) do
    if buf.name == absolute_path then
      if buf.hidden == 0 and (#bufs > 1 or view.View.float.enable) then
        local winnr = vim.api.nvim_get_current_win()
        vim.api.nvim_set_current_win(buf.windows[1])
        vim.cmd ":bn"
        if not view.View.float.enable then
          vim.api.nvim_set_current_win(winnr)
        end
      end
      vim.api.nvim_buf_delete(buf.bufnr, { force = true })
      if M.config.actions.remove_file.close_window then
        close_windows(buf.windows)
      end
      return
    end
  end
end

local function remove_dir(cwd)
  local handle = vim.loop.fs_scandir(cwd)
  if type(handle) == "string" then
    return notify.error(handle)
  end

  while true do
    local name, t = vim.loop.fs_scandir_next(handle)
    if not name then
      break
    end

    local new_cwd = utils.path_join { cwd, name }
    if t == "directory" then
      local success = remove_dir(new_cwd)
      if not success then
        return false
      end
    else
      local success = vim.loop.fs_unlink(new_cwd)
      if not success then
        return false
      end
      clear_buffer(new_cwd)
    end
  end

  return vim.loop.fs_rmdir(cwd)
end

--- Remove a node, notify errors, dispatch events
--- @param node table
function M.remove(node)
  local notify_node = notify.render_path(node.absolute_path)
  if node.nodes ~= nil and not node.link_to then
    local success = remove_dir(node.absolute_path)
    if not success then
      return notify.error("Could not remove " .. notify_node)
    end
    events._dispatch_folder_removed(node.absolute_path)
  else
    events._dispatch_will_remove_file(node.absolute_path)
    local success = vim.loop.fs_unlink(node.absolute_path)
    if not success then
      return notify.error("Could not remove " .. notify_node)
    end
    events._dispatch_file_removed(node.absolute_path)
    clear_buffer(node.absolute_path)
  end
  notify.info(notify_node .. " was properly removed.")
end

function M.fn(node)
  if node.name == ".." then
    return
  end

  local function do_remove()
    M.remove(node)
    if not M.config.filesystem_watchers.enable then
      require("nvim-tree.actions.reloaders.reloaders").reload_explorer()
    end
  end

  if M.config.ui.confirm.remove then
    local prompt_select = "Remove " .. node.name .. " ?"
    local prompt_input = prompt_select .. " y/n: "
    lib.prompt(prompt_input, prompt_select, { "y", "n" }, { "Yes", "No" }, function(item_short)
      utils.clear_prompt()
      if item_short == "y" then
        do_remove()
      end
    end)
  else
    do_remove()
  end
end

function M.setup(opts)
  M.config.ui = opts.ui
  M.config.actions = opts.actions
  M.config.filesystem_watchers = opts.filesystem_watchers
end

return M