(function () {
  const GUARD = "__HireflowInteractionTracker";
  if (window[GUARD]) {
    return;
  }

  const TYPE_DEBOUNCE_MS = 250;

  /** @type {{ recording: boolean, interactions: Array<{action: string, xpath_selector: string, text?: string}>, listenersAttached: boolean, typeTimer: ReturnType<typeof setTimeout> | null, pendingType: { xpath: string, text: string } | null, userEdited: WeakSet<Element> }} */
  const state = {
    recording: false,
    interactions: [],
    listenersAttached: false,
    typeTimer: null,
    pendingType: null,
    userEdited: new WeakSet(),
  };
  window[GUARD] = state;

  /** Input types that represent free-text (or numeric) typing — not clicks-only controls. */
  const TEXT_LIKE_INPUT_TYPES = new Set([
    "text",
    "search",
    "url",
    "tel",
    "email",
    "password",
    "number",
    "",
  ]);

  function normalizedInputType(el) {
    if (el.tagName !== "INPUT") {
      return "";
    }
    const raw = el.getAttribute("type");
    if (raw == null || raw === "") {
      return "text";
    }
    return String(raw).toLowerCase();
  }

  function isTextLikeField(el) {
    if (!el || el.nodeType !== Node.ELEMENT_NODE) {
      return false;
    }
    if (el.tagName === "TEXTAREA") {
      return true;
    }
    if (el.tagName === "INPUT") {
      return TEXT_LIKE_INPUT_TYPES.has(normalizedInputType(el));
    }
    if (el.isContentEditable === true) {
      return true;
    }
    return false;
  }

  function markFieldUserEdited(el) {
    if (isTextLikeField(el)) {
      state.userEdited.add(el);
    }
  }

  function escapeXPathLiteral(str) {
    if (str.indexOf("'") === -1) {
      return "'" + str + "'";
    }
    if (str.indexOf('"') === -1) {
      return '"' + str.replace(/"/g, '\\"') + '"';
    }
    const parts = str.split("'");
    const concatArgs = [];
    for (let i = 0; i < parts.length; i++) {
      concatArgs.push("'" + parts[i] + "'");
      if (i < parts.length - 1) {
        concatArgs.push('"\'"');
      }
    }
    return "concat(" + concatArgs.join(", ") + ")";
  }

  function getXPath(element) {
    if (!element || element.nodeType !== Node.ELEMENT_NODE) {
      return "";
    }
    if (element.id) {
      return "//*" + "[@id=" + escapeXPathLiteral(element.id) + "]";
    }

    const segments = [];
    let node = element;
    while (node && node.nodeType === Node.ELEMENT_NODE) {
      if (node === document.documentElement) {
        segments.unshift("html");
        break;
      }
      const parent = node.parentElement;
      if (!parent) {
        break;
      }
      const tag = node.nodeName.toLowerCase();
      const sameTagSiblings = Array.from(parent.children).filter(
        (c) => c.nodeName === node.nodeName
      );
      const index = sameTagSiblings.indexOf(node) + 1;
      if (sameTagSiblings.length === 1) {
        segments.unshift(tag);
      } else {
        segments.unshift(tag + "[" + index + "]");
      }
      node = parent;
    }
    return "//" + segments.join("/");
  }

  function flushPendingType() {
    state.typeTimer = null;
    if (!state.pendingType) {
      return;
    }
    const { xpath, text } = state.pendingType;
    state.pendingType = null;
    const last = state.interactions[state.interactions.length - 1];
    if (last && last.action === "type" && last.xpath_selector === xpath) {
      last.text = text;
    } else {
      state.interactions.push({
        action: "type",
        text,
        xpath_selector: xpath,
      });
    }
  }

  function scheduleTypeCommit(xpath, text) {
    state.pendingType = { xpath, text };
    if (state.typeTimer) {
      clearTimeout(state.typeTimer);
    }
    state.typeTimer = setTimeout(flushPendingType, TYPE_DEBOUNCE_MS);
  }

  function onClickCapture(ev) {
    if (!state.recording || !ev.isTrusted) {
      return;
    }
    const target = ev.target;
    if (!target || target.nodeType !== Node.ELEMENT_NODE) {
      return;
    }
    flushPendingType();
    state.interactions.push({
      action: "click",
      xpath_selector: getXPath(target),
    });
  }

  function onBeforeInputCapture(ev) {
    if (!state.recording || !ev.isTrusted) {
      return;
    }
    if (typeof InputEvent !== "undefined" && ev instanceof InputEvent) {
      const t = ev.target;
      if (t && t.nodeType === Node.ELEMENT_NODE && isTextLikeField(t)) {
        state.userEdited.add(t);
      }
    }
  }

  function onKeyDownCapture(ev) {
    if (!state.recording || !ev.isTrusted) {
      return;
    }
    const el = document.activeElement;
    if (!el || !isTextLikeField(el)) {
      return;
    }
    if (ev.ctrlKey || ev.metaKey || ev.altKey) {
      if (ev.key === "v" || ev.key === "V" || ev.key === "x" || ev.key === "X") {
        markFieldUserEdited(el);
      }
      return;
    }
    if (
      ev.key.length === 1 ||
      ev.key === "Backspace" ||
      ev.key === "Delete" ||
      ev.key === "Enter"
    ) {
      markFieldUserEdited(el);
    }
  }

  function onPasteCutCapture(ev) {
    if (!state.recording || !ev.isTrusted) {
      return;
    }
    const t = ev.target;
    if (t && t.nodeType === Node.ELEMENT_NODE) {
      markFieldUserEdited(t);
    }
  }

  function onInputCapture(ev) {
    if (!state.recording || !ev.isTrusted) {
      return;
    }
    const target = ev.target;
    if (!target || target.nodeType !== Node.ELEMENT_NODE) {
      return;
    }
    if (!isTextLikeField(target)) {
      return;
    }
    if (!state.userEdited.has(target)) {
      return;
    }
    let text = "";
    if (target.isContentEditable) {
      text = target.innerText || target.textContent || "";
    } else {
      text = target.value != null ? String(target.value) : "";
    }
    const xpath = getXPath(target);
    scheduleTypeCommit(xpath, text);
  }

  function onChangeCapture(ev) {
    if (!state.recording || !ev.isTrusted) {
      return;
    }
    const target = ev.target;
    if (!target || target.nodeType !== Node.ELEMENT_NODE) {
      return;
    }
    if (target.tagName !== "SELECT") {
      return;
    }
    flushPendingType();
    const text = target.value != null ? String(target.value) : "";
    state.interactions.push({
      action: "select",
      text,
      xpath_selector: getXPath(target),
    });
  }

  function attachListeners() {
    if (state.listenersAttached) {
      return;
    }
    document.addEventListener("click", onClickCapture, true);
    document.addEventListener("beforeinput", onBeforeInputCapture, true);
    document.addEventListener("keydown", onKeyDownCapture, true);
    document.addEventListener("paste", onPasteCutCapture, true);
    document.addEventListener("cut", onPasteCutCapture, true);
    document.addEventListener("input", onInputCapture, true);
    document.addEventListener("change", onChangeCapture, true);
    state.listenersAttached = true;
  }

  function detachListeners() {
    if (!state.listenersAttached) {
      return;
    }
    document.removeEventListener("click", onClickCapture, true);
    document.removeEventListener("beforeinput", onBeforeInputCapture, true);
    document.removeEventListener("keydown", onKeyDownCapture, true);
    document.removeEventListener("paste", onPasteCutCapture, true);
    document.removeEventListener("cut", onPasteCutCapture, true);
    document.removeEventListener("input", onInputCapture, true);
    document.removeEventListener("change", onChangeCapture, true);
    state.listenersAttached = false;
  }

  chrome.runtime.onMessage.addListener((message, _sender, sendResponse) => {
    if (message.type === "START_RECORDING") {
      state.interactions = [];
      state.pendingType = null;
      state.userEdited = new WeakSet();
      if (state.typeTimer) {
        clearTimeout(state.typeTimer);
        state.typeTimer = null;
      }
      state.recording = true;
      attachListeners();
      sendResponse({ ok: true });
      return false;
    }

    if (message.type === "STOP_AND_GET_INTERACTIONS") {
      state.recording = false;
      if (state.typeTimer) {
        clearTimeout(state.typeTimer);
        state.typeTimer = null;
      }
      flushPendingType();
      detachListeners();
      const interactions = state.interactions.slice();
      state.interactions = [];
      sendResponse({ ok: true, interactions });
      return false;
    }

    if (message.type === "GET_STATUS") {
      sendResponse({
        ok: true,
        recording: state.recording,
        count: state.interactions.length,
      });
      return false;
    }

    return false;
  });
})();