local util = require 'lspconfig.util'

local root_files = {
  '.luarc.json',
  '.luarc.jsonc',
  '.luacheckrc',
  '.stylua.toml',
  'stylua.toml',
  'selene.toml',
  'selene.yml',
  '.git',
}

return {
  default_config = {
    cmd = { 'lua-language-server' },
    filetypes = { 'lua' },
    root_dir = util.root_pattern(root_files),
    single_file_support = true,
    log_level = vim.lsp.protocol.MessageType.Warning,
  },
  docs = {
    description = [[
https://github.com/luals/lua-language-server

Lua language server.

`lua-language-server` can be installed by following the instructions [here](https://luals.github.io/#neovim-install).

The default `cmd` assumes that the `lua-language-server` binary can be found in `$PATH`.

If you primarily use `lua-language-server` for Neovim, and want to provide completions,
analysis, and location handling for plugins on runtime path, you can use the following
settings.

```lua
require'lspconfig'.lua_ls.setup {
  on_init = function(client)
    if client.workspace_folders then
      local path = client.workspace_folders[1].name
      if path ~= vim.fn.stdpath('config') and (vim.uv.fs_stat(path..'/.luarc.json') or vim.uv.fs_stat(path..'/.luarc.jsonc')) then
        return
      end
    end

    client.config.settings.Lua = vim.tbl_deep_extend('force', client.config.settings.Lua, {
      runtime = {
        -- Tell the language server which version of Lua you're using
        -- (most likely LuaJIT in the case of Neovim)
        version = 'LuaJIT'
      },
      -- Make the server aware of Neovim runtime files
      workspace = {
        checkThirdParty = false,
        library = {
          vim.env.VIMRUNTIME
          -- Depending on the usage, you might want to add additional paths here.
          -- "${3rd}/luv/library"
          -- "${3rd}/busted/library",
        }
        -- or pull in all of 'runtimepath'. NOTE: this is a lot slower and will cause issues when working on your own configuration (see https://github.com/neovim/nvim-lspconfig/issues/3189)
        -- library = vim.api.nvim_get_runtime_file("", true)
      }
    })
  end,
  settings = {
    Lua = {}
  }
}
```

See `lua-language-server`'s [documentation](https://luals.github.io/wiki/settings/) for an explanation of the above fields:
* [Lua.runtime.path](https://luals.github.io/wiki/settings/#runtimepath)
* [Lua.workspace.library](https://luals.github.io/wiki/settings/#workspacelibrary)

]],
  },
}
