local function augroup(name)
  return vim.api.nvim_create_augroup('nvim_' .. name, { clear = true })
end

-- Auto-format on save
vim.api.nvim_create_autocmd('BufWritePre', {
  group = augroup('format_on_save'),
  pattern = '*',
  callback = function()
    vim.lsp.buf.format({ async = false })
  end,
  desc = 'Auto-format on save with LSP',
})

-- Highlight on yank
vim.api.nvim_create_autocmd('TextYankPost', {
  group = augroup('highlight_yank'),
  callback = function()
    vim.hl.on_yank()
  end,
  desc = 'Highlight yanked text',
})

-- Remove trailing whitespace
vim.api.nvim_create_autocmd('BufWritePre', {
  group = augroup('remove_trailing_whitespace'),
  pattern = '*',
  command = [[%s/\s\+$//e]],
  desc = 'Remove trailing whitespace on save',
})

-- Append newline at EOF (excluding YAML)
vim.api.nvim_create_autocmd('BufWritePre', {
  group = augroup('append_newline_eof'),
  pattern = '*',
  callback = function()
    local last_line = vim.fn.getline('$')
    local ft = vim.bo.filetype
    if last_line ~= '' and not last_line:match('\n$') and ft ~= 'yaml' then
      vim.fn.append(vim.fn.line('$'), '')
    end
  end,
  desc = 'Append newline at EOF (except YAML)',
})

-- Auto-update plugins on startup
vim.api.nvim_create_autocmd('VimEnter', {
  group = augroup('autoupdate'),
  callback = function()
    local ok, lazy_status = pcall(require, 'lazy.status')
    if ok and lazy_status.has_updates() then
      require('lazy').update({ show = false })
    end
  end,
  desc = 'Auto-update plugins on startup',
})

-- Sync plugins after lazy check
vim.api.nvim_create_autocmd('User', {
  pattern = 'LazyCheck',
  group = augroup('lazy_sync'),
  callback = function()
    vim.schedule(function()
      require('lazy').sync({ wait = false, show = false })
    end)
  end,
  desc = 'Sync plugins after LazyCheck',
})

-- Terminal buffer settings
vim.api.nvim_create_autocmd('TermOpen', {
  group = augroup('terminal_settings'),
  pattern = '*',
  callback = function()
    vim.cmd('startinsert')
    vim.wo.number = false
    vim.wo.relativenumber = false
    vim.cmd('normal! G')
  end,
  desc = 'Terminal buffer auto-insert and no line numbers',
})

-- Terminal mode escape mapping (applied per buffer)
vim.api.nvim_create_autocmd('TermOpen', {
  group = augroup('terminal_escape'),
  pattern = '*',
  callback = function()
    vim.keymap.set('t', '<esc><esc>', '<c-\\><c-n>', { buffer = true, desc = 'Exit terminal mode' })
  end,
  desc = 'Terminal escape mapping',
})