local capabilities = require('cmp_nvim_lsp').default_capabilities()
local M = {}
local augroup_name = 'CosmicNvimLspFormat'
local group = vim.api.nvim_create_augroup(augroup_name, { clear = true })
local user_config = require('cosmic.core.user')
local u = require('cosmic.utils')

function M.on_attach(client, bufnr)
  local function buf_set_option(name, value)
    vim.api.nvim_set_option_value(name, value, {
      buf = bufnr,
    })
  end

  -- Enable completion triggered by <c-x><c-o>
  buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')

  if user_config.lsp.inlay_hint and client.supports_method('textDocument/inlayHint') then
    vim.lsp.inlay_hint(bufnr, true)
  end

  if client.supports_method('textDocument/formatting') then
    -- set up :LspFormat for clients that are capable
    vim.cmd(
      string.format("command! -nargs=? LspFormat lua require('cosmic.utils.lsp').force_format(%s, <q-args>)", bufnr)
    )

    -- set up auto format on save
    if user_config.lsp.format_on_save then
      -- check user config to see if we can format on save
      -- collect filetype(s) from user config
      local filetype_patterns = {}
      local filetype_allowed = false
      if vim.islist(user_config.lsp.format_on_save) then
        filetype_patterns = user_config.lsp.format_on_save
      else -- any filetype if none set
        filetype_allowed = true
      end

      vim.api.nvim_clear_autocmds({
        group = group,
        buffer = bufnr,
      })
      -- autocommand for format on save with specified filetype(s)
      vim.api.nvim_create_autocmd('BufWritePre', {
        callback = function(ev)
          for _, pattern in pairs(filetype_patterns) do
            if string.match(ev.file, pattern) then
              filetype_allowed = true
            end
          end
          if filetype_allowed then
            require('cosmic.utils.lsp').format(bufnr)
          end
        end,
        buffer = bufnr,
        group = group,
      })
    end
  end

  -- set up default mappings
  require('cosmic.lsp.mappings').init(client, bufnr)

  -- set up any additional mappings/overrides from user config
  for _, callback in pairs(user_config.lsp.on_attach_mappings) do
    callback(client, bufnr)
  end
end

M.capabilities = u.merge(capabilities, {
  -- See: https://github.com/neovim/neovim/issues/23291
  workspace = {
    didChangeWatchedFiles = {
      dynamicRegistration = false,
    },
  },
})

return M