local logger = require('dep.log')

---@class lazy
---@field load function the function to load the plugin
---@field command_ids table the commands that have been registered
---@field auto_ids table the auto commands that have been registered
---@field keybind_ids table the keybinds that have been registered
local lazy = {}

--- create a new instance of lazy
---@return lazy
function lazy:new()
  local o = {}

  setmetatable(o, self)
  o.command_ids = {}
  o.auto_ids = {}
  o.keybind_ids = {}

  self.__index = self

  return o
end

--- set the loading function
---@param load function the loading function
function lazy:set_load(load)
  self.load = load
end

--- get the configured load function
---@return function load function
function lazy:get_load()
  return self.load
end

--- create a usercommand which will trigger the plugin to load
---@param name string the name of the command
---@param opts vim.api.keyset.user_command? options
function lazy:cmd(name, opts)
  opts = opts or {}
  vim.api.nvim_create_user_command(name, opts['callback'] or function()
    self:cleanup()
  end, opts)

  table.insert(self.command_ids, name)
end

--- create an auto command which will trigger the plugin to load
---@param event string the event to trigger on
---@param opts vim.api.keyset.create_autocmd? options
function lazy:auto(event, opts)
  opts = opts or {}

  opts['callback'] = opts['callback'] or function()
    self:cleanup()
  end

  -- create the auto command and save it
  table.insert(self.auto_ids, vim.api.nvim_create_autocmd(event, opts))
end

--- create an auto command which will trigger on filetype
---@param filetype string filetype to register the auto on
function lazy:ft(filetype)
  lazy:auto("FileType", {
    pattern = filetype
  })
end

--- create a keybind which will trigger the plugin to load
---@param mode string the mode to trigger in
---@param bind string the binding to use
---@param opts vim.keymap.set.Opts? options
function lazy:keymap(mode, bind, opts)
  opts = opts or {}

  -- move the rerun arg to a seperate variable because keymap.set doesn't like
  -- options it doesn't know of
  local rerun = opts['rerun'] or true
  opts['rerun'] = nil

  vim.keymap.set(mode, bind, opts['callback'] or function()
    -- register keymap unload
    self:cleanup()

    -- call the keymap after the user has mapped it
    if rerun then
      local keys = vim.api.nvim_replace_termcodes(bind, true, false, true)
      vim.api.nvim_input(keys)
    end
  end, opts)

  table.insert(self.keybind_ids, { ['mode'] = mode, ['bind'] = bind })
end

--- cleanup all the callbacks, and load the plugin
function lazy:cleanup()
    -- cleanup user commands
  for _, command_id in pairs(self.command_ids) do
    local ok, err = pcall(vim.api.nvim_del_user_command, command_id)
    if not ok then
      logger:log("lazy", err or "failed to delete user command")
    end
  end
  -- cleanup auto commands
  for _, auto_id in pairs(self.auto_ids) do
    local ok, err = pcall(vim.api.nvim_del_autocmd, auto_id)
    if not ok then
      logger:log("lazy", err or "failed to delete auto command")
    end
  end
  -- cleanup keymaps
  for _, keybind_id in pairs(self.keybind_ids) do
    local ok, err = pcall(vim.keymap.del, keybind_id.mode, keybind_id.bind, {})
    if not ok then
      logger:log("lazy", err or "failed to delete keymap")
    end
  end
  -- load the plugin
  self:load()
end

return lazy