(function () {
  "use strict";

  // ---- Alternância de tema (persistida em localStorage) ----
  function currentTheme() {
    var explicit = document.documentElement.getAttribute("data-theme");
    if (explicit) return explicit;
    return window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
  }
  var toggle = document.getElementById("themeToggle");
  if (toggle) {
    toggle.addEventListener("click", function () {
      var next = currentTheme() === "dark" ? "light" : "dark";
      document.documentElement.setAttribute("data-theme", next);
      try { localStorage.setItem("theme", next); } catch (e) {}
    });
  }

  // ---- Área de upload (clique + arrastar/soltar + nome dos arquivos) ----
  var drop = document.getElementById("filedrop");
  var input = document.getElementById("fileInput");
  var label = document.getElementById("filedropText");
  var form = document.getElementById("uploadForm");
  var btn = document.getElementById("uploadBtn");

  function describe(files) {
    if (!files || !files.length) return "Clique ou arraste arquivos aqui";
    if (files.length === 1) return files[0].name;
    return files.length + " arquivos selecionados";
  }

  if (input && label) {
    input.addEventListener("change", function () {
      label.textContent = describe(input.files);
    });
  }
  if (drop && input) {
    ["dragenter", "dragover"].forEach(function (ev) {
      drop.addEventListener(ev, function (e) { e.preventDefault(); drop.classList.add("drag"); });
    });
    ["dragleave", "drop"].forEach(function (ev) {
      drop.addEventListener(ev, function (e) { e.preventDefault(); drop.classList.remove("drag"); });
    });
    drop.addEventListener("drop", function (e) {
      if (e.dataTransfer && e.dataTransfer.files && e.dataTransfer.files.length) {
        input.files = e.dataTransfer.files;
        if (label) label.textContent = describe(input.files);
      }
    });
  }
  if (form && btn) {
    form.addEventListener("submit", function () {
      if (input && input.files && input.files.length) {
        btn.disabled = true;
        btn.textContent = "Processando…";
      }
    });
  }
})();