(function () {
  "use strict";

  var cfg = window.AZA_DOC;
  if (!cfg) return;

  var editor = document.getElementById("doc-editor");
  var titleEl = document.getElementById("doc-title");
  var categoryEl = document.getElementById("doc-category");
  var taskEl = document.getElementById("doc-task");
  var statusEl = document.getElementById("save-status");
  var saveBtn = document.getElementById("btn-save");
  var saving = false;
  var autoTimer = null;
  var lastSaved = "";

  function setStatus(state, text) {
    statusEl.className = "save-status save-status-" + state;
    statusEl.textContent = text;
  }

  function payloadSnapshot() {
    return JSON.stringify({
      title: titleEl.value,
      category: categoryEl.value,
      task: taskEl.value,
      html: editor.innerHTML,
    });
  }

  function markDirty() {
    if (!saving) {
      setStatus("unsaved", "Nicht gespeicherte Änderungen");
    }
    clearTimeout(autoTimer);
    autoTimer = setTimeout(function () {
      saveDocument(false);
    }, 3000);
  }

  function saveDocument(manual) {
    if (saving) return;
    var snap = payloadSnapshot();
    if (!manual && snap === lastSaved) {
      setStatus("saved", "Gespeichert");
      return;
    }
    saving = true;
    setStatus("saving", "Speichert...");

    var fd = new FormData();
    fd.append("csrf_token", cfg.csrf);
    fd.append("title", titleEl.value.trim() || "Unbenanntes Dokument");
    fd.append("content_html", editor.innerHTML);
    fd.append("category", categoryEl.value);
    fd.append("task_id", taskEl.value);

    fetch("/api/documents/" + cfg.id + "/save", {
      method: "POST",
      body: fd,
      credentials: "same-origin",
    })
      .then(function (r) { return r.json(); })
      .then(function (data) {
        saving = false;
        if (data.ok) {
          lastSaved = snap;
          setStatus("saved", "Gespeichert");
        } else {
          setStatus("error", "Fehler beim Speichern");
        }
      })
      .catch(function () {
        saving = false;
        setStatus("error", "Fehler beim Speichern");
      });
  }

  function findListItem(node) {
    var el = node && node.nodeType === 3 ? node.parentElement : node;
    while (el && el !== editor) {
      if (el.tagName === "LI") return el;
      el = el.parentElement;
    }
    return null;
  }

  function isEmptyListItem(li) {
    if (!li) return false;
    var text = (li.textContent || "").replace(/\u00a0/g, " ").replace(/\u200B/g, "").trim();
    return text === "";
  }

  editor.addEventListener("keydown", function (e) {
    if (e.key !== "Enter" || e.shiftKey) return;
    var li = findListItem(window.getSelection().anchorNode);
    if (!li) return;
    if (isEmptyListItem(li)) {
      e.preventDefault();
      document.execCommand("outdent");
      if (findListItem(window.getSelection().anchorNode) && isEmptyListItem(findListItem(window.getSelection().anchorNode))) {
        document.execCommand("outdent");
      }
      var p = document.createElement("p");
      p.appendChild(document.createElement("br"));
      var parent = li.parentElement;
      if (parent && (parent.tagName === "UL" || parent.tagName === "OL") && parent.children.length === 1) {
        parent.replaceWith(p);
      } else {
        li.replaceWith(p);
      }
      var sel = window.getSelection();
      var range = document.createRange();
      range.selectNodeContents(p);
      range.collapse(true);
      sel.removeAllRanges();
      sel.addRange(range);
      markDirty();
    }
  });

  [titleEl, categoryEl, taskEl].forEach(function (el) {
    el.addEventListener("input", markDirty);
    el.addEventListener("change", markDirty);
  });

  editor.addEventListener("input", markDirty);

  saveBtn.addEventListener("click", function () {
    clearTimeout(autoTimer);
    saveDocument(true);
  });

  document.querySelectorAll(".doc-tb-btn").forEach(function (btn) {
    btn.addEventListener("click", function (e) {
      e.preventDefault();
      var cmd = btn.getAttribute("data-cmd");
      var val = btn.getAttribute("data-value");
      editor.focus();
      if (cmd === "link") {
        var url = window.prompt("Link-URL (https://...):", "https://");
        if (url && !url.toLowerCase().startsWith("javascript:")) {
          document.execCommand("createLink", false, url);
        }
      } else if (cmd === "formatBlock" && val) {
        document.execCommand(cmd, false, val);
      } else {
        document.execCommand(cmd, false, null);
      }
      markDirty();
    });
  });

  lastSaved = payloadSnapshot();
})();