-- Example configuations here: https://github.com/mattn/efm-langserver
local M = {}

M.setup = function()
  vim.cmd "let proj = FindRootDirectory()"
  local root_dir = vim.api.nvim_get_var "proj"

  local get_linter_instance = function()
    -- prioritize local instance over global
    local local_instance = root_dir .. "/node_modules/.bin/" .. O.lang.tsserver.linter
    if vim.fn.executable(local_instance) == 1 then
      return local_instance
    end
    return O.lang.tsserver.linter
  end

  local tsserver_args = {}
  local formattingSupported = false

  if O.lang.tsserver.linter == "eslint" or O.lang.tsserver.linter == "eslint_d" then
    local eslint = {
      lintCommand = get_linter_instance() .. " -f visualstudio --stdin --stdin-filename ${INPUT}",
      lintStdin = true,
      lintFormats = {
        "%f(%l,%c): %tarning %m",
        "%f(%l,%c): %trror %m",
      },
      lintSource = O.lang.tsserver.linter,
      lintIgnoreExitCode = true,
    }
    table.insert(tsserver_args, eslint)
    -- Only eslint_d supports --fix-to-stdout
    if string.find(get_linter_instance(), "eslint_d") then
      formattingSupported = true
      local eslint_fix = {
        formatCommand = get_linter_instance() .. " --fix-to-stdout --stdin --stdin-filename ${INPUT}",
        formatStdin = true,
      }
      table.insert(tsserver_args, eslint_fix)
    end
  end

  require("lspconfig").efm.setup {
    -- init_options = {initializationOptions},
    cmd = { DATA_PATH .. "/lspinstall/efm/efm-langserver" },
    init_options = { documentFormatting = formattingSupported, codeAction = false },
    root_dir = require("lspconfig").util.root_pattern(".git/", "package.json"),
    filetypes = {
      "vue",
      "javascript",
      "javascriptreact",
      "typescript",
      "typescriptreact",
      "javascript.jsx",
      "typescript.tsx",
    },
    settings = {
      rootMarkers = { ".git/", "package.json" },
      languages = {
        vue = tsserver_args,
        javascript = tsserver_args,
        javascriptreact = tsserver_args,
        ["javascript.jsx"] = tsserver_args,
        typescript = tsserver_args,
        ["typescript.tsx"] = tsserver_args,
        typescriptreact = tsserver_args,
      },
    },
  }
end

return M