local core = require "fzf-lua.core"
local shell = require "fzf-lua.shell"
local config = require "fzf-lua.config"
local actions = require "fzf-lua.actions"

local M = {}

M.metatable = function(opts)

  opts = config.normalize_opts(opts, config.globals.builtin)
  if not opts then return end

  if not opts.metatable then opts.metatable = getmetatable('').__index end

  coroutine.wrap(function ()

    local prev_act = shell.action(function (args)
      -- TODO: retreive method help
      local help = ''
      return string.format("%s:%s", args[1], help)
    end)

    local methods = {}
    for k, _ in pairs(opts.metatable) do
      if not opts.metatable_exclude or opts.metatable_exclude[k] == nil then
        table.insert(methods, k)
      end
    end

    table.sort(methods, function(a, b) return a<b end)

    opts.fzf_opts['--preview'] = prev_act
    opts.fzf_opts['--preview-window'] = 'hidden:down:10'
    opts.fzf_opts['--no-multi'] = ''

    local selected = core.fzf(opts, methods)

    if not selected then return end

    actions.act(opts.actions, selected)

  end)()

end

return M