vim.o.updatetime = 250

vim.cmd [[autocmd CursorHold,CursorHoldI * lua vim.diagnostic.open_float(nil, {focus=false})]]

-- autocomplete
local completion_timer = nil

local function get_buffer_keywords(prefix)
  local matches = {}
  local seen = {}
  for _, buf in ipairs(vim.api.nvim_list_bufs()) do
    if vim.api.nvim_buf_is_loaded(buf) then
      for _, line in ipairs(vim.api.nvim_buf_get_lines(buf, 0, -1, false)) do
        for word in line:gmatch("[%w_]+") do
          if word ~= prefix and word:sub(1, #prefix) == prefix and not seen[word] then
            seen[word] = true
            table.insert(matches, word)
          end
        end
      end
    end
  end
  return matches
end

vim.api.nvim_create_autocmd("TextChangedI", {
  callback = function()
    if completion_timer then
      completion_timer:stop()
    end
    completion_timer = vim.uv.new_timer()
    completion_timer:start(150, 0, vim.schedule_wrap(function()
      if vim.fn.pumvisible() == 1 or vim.api.nvim_get_mode().mode ~= "i" then
        return
      end
      local col = vim.api.nvim_win_get_cursor(0)[2]
      local line = vim.api.nvim_get_current_line()
      local prefix = line:sub(1, col):match("[%w_]+$")
      if not prefix or #prefix < 2 then
        return
      end
      local matches = get_buffer_keywords(prefix)
      if #matches > 0 then
        vim.fn.complete(col - #prefix + 1, matches)
      end
    end))
  end,
})

if not os.getenv("NVIM_LSP_OMIT_DIR") then
  vim.api.nvim_create_autocmd("LspAttach", {
    group = vim.api.nvim_create_augroup("lsp", { clear = true }),
    callback = function(args)
      -- enable completion
      vim.lsp.completion.enable(true, args.data.client_id, args.buf, { autotrigger = true })

      -- autoformat, if not disabled
      if not os.getenv("NVIM_LSP_NO_AUTOFMT") then
        vim.api.nvim_create_autocmd("BufWritePre", {
          buffer = args.buf,
          callback = function()
            vim.lsp.buf.format {}
          end,
        })
      end
    end
  })
end