coc = {}

vim.g.coc_global_extensions = {
    "coc-clangd",
    "coc-fish",
    "coc-go",
    "coc-haxe",
    "coc-java",
    "coc-json",
    "coc-kotlin",
    "coc-lua",
    "coc-rust-analyzer",
    "coc-snippets",
    "coc-tabnine",
    "coc-toml",
}

local function check_back_space()
  local col = vim.fn.col(".") - 1
  return col <= 0 or vim.fn.getline("."):sub(col, col):match("%s")
end

function coc.tab_completion()
  if vim.fn.pumvisible() > 0 then
    return escape_keycode("<C-n>")
  end

  if check_back_space() then
    return escape_keycode("<TAB>")
  end

  return vim.fn["coc#refresh"]()
end

function coc.shift_tab_completion()
    if vim.fn.pumvisible() > 0 then
        return escape_keycode("<C-p>")
    else
        return escape_keycode("<C-h>")
    end
end

function coc.cr_completion()
    if vim.fn.pumvisible() > 0 then
        return vim.fn["coc#_select_confirm"]()
    else
        return escape_keycode([[\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>]])
    end
end