function root_markers_with_field(root_files, new_names, field, fname)
  local path = vim.fn.fnamemodify(fname, ":h")
  local found = vim.fs.find(new_names, { path = path, upward = true })

  for _, f in ipairs(found or {}) do
    -- Match the given `field`.
    for line in io.lines(f) do
      if line:find(field) then
        root_files[#root_files + 1] = vim.fs.basename(f)
        break
      end
    end
  end

  return root_files
end

function insert_package_json(root_files, field, fname)
  return root_markers_with_field(root_files, { "package.json", "package.json5" }, field, fname)
end

return {
  cmd = { "tailwindcss-language-server", "--stdio" },
  -- filetypes copied and adjusted from tailwindcss-intellisense
  filetypes = {
    -- html
    "aspnetcorerazor",
    "astro",
    "astro-markdown",
    "blade",
    "clojure",
    "django-html",
    "htmldjango",
    "edge",
    "eelixir", -- vim ft
    "elixir",
    "ejs",
    "erb",
    "eruby", -- vim ft
    "gohtml",
    "gohtmltmpl",
    "haml",
    "handlebars",
    "hbs",
    "html",
    "htmlangular",
    "html-eex",
    "heex",
    "jade",
    "leaf",
    "liquid",
    "markdown",
    "mdx",
    "mustache",
    "njk",
    "nunjucks",
    "php",
    "razor",
    "slim",
    "twig",
    -- css
    "css",
    "less",
    "postcss",
    "sass",
    "scss",
    "stylus",
    "sugarss",
    -- js
    "javascript",
    "javascriptreact",
    "reason",
    "rescript",
    "typescript",
    "typescriptreact",
    -- mixed
    "vue",
    "svelte",
    "templ",
  },
  settings = {
    tailwindCSS = {
      validate = true,
      lint = {
        cssConflict = "warning",
        invalidApply = "error",
        invalidScreen = "error",
        invalidVariant = "error",
        invalidConfigPath = "error",
        invalidTailwindDirective = "error",
        recommendedVariantOrder = "warning",
      },
      classAttributes = {
        "class",
        "className",
        "class:list",
        "classList",
        "ngClass",
      },
      includeLanguages = {
        eelixir = "html-eex",
        elixir = "phoenix-heex",
        eruby = "erb",
        heex = "phoenix-heex",
        htmlangular = "html",
        templ = "html",
      },
    },
  },
  before_init = function(_, config)
    if not config.settings then
      config.settings = {}
    end
    if not config.settings.editor then
      config.settings.editor = {}
    end
    if not config.settings.editor.tabSize then
      config.settings.editor.tabSize = vim.lsp.util.get_effective_tabstop()
    end
  end,
  workspace_required = true,
  root_dir = function(bufnr, on_dir)
    local root_files = {
      -- Generic
      "tailwind.config.js",
      "tailwind.config.cjs",
      "tailwind.config.mjs",
      "tailwind.config.ts",
      "postcss.config.js",
      "postcss.config.cjs",
      "postcss.config.mjs",
      "postcss.config.ts",
      -- Phoenix
      "assets/tailwind.config.js",
      "assets/tailwind.config.cjs",
      "assets/tailwind.config.mjs",
      "assets/tailwind.config.ts",
      -- Django
      "theme/static_src/tailwind.config.js",
      "theme/static_src/tailwind.config.cjs",
      "theme/static_src/tailwind.config.mjs",
      "theme/static_src/tailwind.config.ts",
      "theme/static_src/postcss.config.js",
      -- Rails
      "app/assets/stylesheets/application.tailwind.css",
      "app/assets/tailwind/application.css",
    }
    local fname = vim.api.nvim_buf_get_name(bufnr)
    root_files = insert_package_json(root_files, "tailwindcss", fname)
    root_files = root_markers_with_field(root_files, { "mix.lock" }, "tailwind", fname)
    on_dir(vim.fs.dirname(vim.fs.find(root_files, { path = fname, upward = true })[1]))
  end,
}