/* Gogo Telefon chat widget — embeddable, dependency-free (§7).
 *
 * Usage on the salon's site:
 *   <script src="https://app.gogotelefon.ba/widget.js" data-gogo-key="PUBLIC_KEY" async></script>
 */
(function () {
  "use strict";

  var script = document.currentScript ||
    document.querySelector("script[data-gogo-key]");
  if (!script) return;
  var KEY = script.getAttribute("data-gogo-key");
  if (!KEY) return;
  var BASE = (function () {
    try {
      var u = new URL(script.src);
      return u.origin;
    } catch (e) {
      return "";
    }
  })();
  var WS_BASE = BASE.replace(/^http/, "ws");
  var STORE = "gogo_chat_" + KEY;

  /* ---------- styles ---------- */
  var css =
    ".gogo-bubble{position:fixed;bottom:20px;right:20px;width:56px;height:56px;border-radius:50%;" +
    "background:#7c3aed;color:#fff;border:none;cursor:pointer;box-shadow:0 4px 12px rgba(0,0,0,.25);" +
    "font-size:26px;z-index:999999;display:flex;align-items:center;justify-content:center}" +
    ".gogo-panel{position:fixed;bottom:88px;right:20px;width:340px;max-width:calc(100vw - 32px);" +
    "height:480px;max-height:calc(100vh - 120px);background:#fff;border-radius:14px;z-index:999999;" +
    "box-shadow:0 8px 30px rgba(0,0,0,.3);display:none;flex-direction:column;overflow:hidden;" +
    "font-family:system-ui,sans-serif}" +
    ".gogo-panel.open{display:flex}" +
    ".gogo-head{background:#7c3aed;color:#fff;padding:12px 16px;font-weight:600;font-size:15px}" +
    ".gogo-head small{display:block;font-weight:400;opacity:.85;font-size:12px}" +
    ".gogo-msgs{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:8px;background:#f7f7fa}" +
    ".gogo-msg{max-width:82%;padding:8px 12px;border-radius:12px;font-size:14px;line-height:1.45;" +
    "white-space:pre-wrap;word-wrap:break-word}" +
    ".gogo-msg.bot{background:#fff;border:1px solid #e5e5ec;align-self:flex-start;border-bottom-left-radius:4px}" +
    ".gogo-msg.user{background:#7c3aed;color:#fff;align-self:flex-end;border-bottom-right-radius:4px}" +
    ".gogo-msg.typing{color:#888;font-style:italic;background:#fff;border:1px dashed #ddd}" +
    ".gogo-form{display:flex;border-top:1px solid #e5e5ec;background:#fff}" +
    ".gogo-form input[type=text]{flex:1;border:0;padding:12px 14px;font-size:14px;outline:none}" +
    ".gogo-form button{border:0;background:none;color:#7c3aed;font-weight:700;padding:0 16px;cursor:pointer;font-size:14px}" +
    ".gogo-hp{position:absolute;left:-9999px;opacity:0;height:0;width:0}";

  var style = document.createElement("style");
  style.textContent = css;
  document.head.appendChild(style);

  /* ---------- DOM ---------- */
  var bubble = document.createElement("button");
  bubble.className = "gogo-bubble";
  bubble.setAttribute("aria-label", "Otvori chat");
  bubble.textContent = "💬";

  var panel = document.createElement("div");
  panel.className = "gogo-panel";
  panel.innerHTML =
    '<div class="gogo-head">Virtuelni asistent<small>Gogo Telefon — odgovaramo odmah</small></div>' +
    '<div class="gogo-msgs"></div>' +
    '<form class="gogo-form">' +
    '<input type="text" placeholder="Upišite poruku…" maxlength="500" autocomplete="off">' +
    '<input type="text" class="gogo-hp" name="website" tabindex="-1" autocomplete="off">' +
    "<button type=\"submit\">Pošalji</button></form>";

  document.body.appendChild(bubble);
  document.body.appendChild(panel);

  var msgs = panel.querySelector(".gogo-msgs");
  var form = panel.querySelector(".gogo-form");
  var input = form.querySelector('input[type=text]:not(.gogo-hp)');
  var honeypot = form.querySelector(".gogo-hp");

  function addMsg(text, who) {
    var el = document.createElement("div");
    el.className = "gogo-msg " + who;
    el.textContent = text;
    msgs.appendChild(el);
    msgs.scrollTop = msgs.scrollHeight;
    return el;
  }

  var typingEl = null;
  function showTyping() {
    if (typingEl) return;
    typingEl = addMsg("Gogo piše…", "bot typing");
  }
  function hideTyping() {
    if (typingEl) { typingEl.remove(); typingEl = null; }
  }

  /* ---------- WebSocket ---------- */
  var ws = null;
  var connected = false;

  function connect() {
    if (ws) return;
    var resume = "";
    try { resume = localStorage.getItem(STORE) || ""; } catch (e) {}
    ws = new WebSocket(
      WS_BASE + "/widget/ws?key=" + encodeURIComponent(KEY) +
      (resume ? "&resume=" + encodeURIComponent(resume) : "")
    );
    ws.onopen = function () { connected = true; };
    ws.onmessage = function (ev) {
      var data;
      try { data = JSON.parse(ev.data); } catch (e) { return; }
      if (data.session) {
        try { localStorage.setItem(STORE, data.session); } catch (e) {}
      }
      if (data.type === "greeting") {
        addMsg(data.text, "bot");
      } else if (data.type === "resume") {
        msgs.innerHTML = "";
        (data.messages || []).forEach(function (m) {
          addMsg(m.text, m.role === "user" ? "user" : "bot");
        });
      } else if (data.type === "typing") {
        showTyping();
      } else if (data.type === "message") {
        hideTyping();
        addMsg(data.text, "bot");
      }
    };
    ws.onclose = function (ev) {
      connected = false;
      ws = null;
      hideTyping();
      if (ev.code === 4429) {
        addMsg("Previše pokušaja — molimo pokušajte kasnije ili pozovite salon.", "bot");
      }
    };
  }

  bubble.addEventListener("click", function () {
    panel.classList.toggle("open");
    if (panel.classList.contains("open")) {
      connect();
      input.focus();
    }
  });

  form.addEventListener("submit", function (e) {
    e.preventDefault();
    var text = input.value.trim();
    if (!text || !ws || !connected) return;
    addMsg(text, "user");
    ws.send(JSON.stringify({ type: "message", text: text, website: honeypot.value }));
    input.value = "";
  });
})();