class Tutorial {
  constructor(steps, options = {}) {
    this.steps = steps;
    this.currentStep = 0;
    this.isRunning = false;
    this.isWaitingForEvent = false;

    this.options = {
      overlayOpacity: 0.7,
      ...options
    };

    this.zIndexBase = 1000;
    this.zIndexStep = 0;

    this.modifiedElements = new Map();
    this.baseElement = null;
    this.currentElement = null;

    this.tooltipObserver = null;
    this.tooltipRAF = null;
    this.currentStepElement = null;
  }

  // ---------------- UI ----------------

  createUI() {
    document.addEventListener("keydown", e => {
      if (this.isWaitingForEvent) return;

      if (e.key === "ArrowRight") this.next();
      if (e.key === "ArrowLeft") this.prev();
    });

    this.tooltip = document.createElement("div");
    this.tooltip.id = "tutorial-tooltip";

    Object.assign(this.tooltip.style, {
      position: "absolute",
      display: "flex",
      padding: "12px",
      borderRadius: "8px",
      zIndex: 9999,
      maxWidth: "350px",
      boxShadow: "0 10px 30px rgba(0,0,0,0.2)",
      backdropFilter: "blur(5px)",
      justifyContent: "center"
    });

    this.text = document.createElement("p");

    this.nextBtn = document.createElement("button");
    this.nextBtn.innerHTML = ">";
    this.nextBtn.classList.add("bluebutton");

    this.prevBtn = document.createElement("button");
    this.prevBtn.innerHTML = "<";
    this.prevBtn.classList.add("yellowbutton");

    this.nextBtn.onclick = () => this.next();
    this.prevBtn.onclick = () => this.prev();

    this.tooltip.appendChild(this.text);
    this.tooltip.appendChild(this.prevBtn);
    this.tooltip.appendChild(this.nextBtn);

    document.body.appendChild(this.tooltip);
  }

  // ---------------- Element wait ----------------

  waitForElement(selector, timeout = 5000) {
    return new Promise(resolve => {
      const start = Date.now();

      const check = () => document.querySelector(selector);

      let el = check();
      if (el) return resolve(el);

      const observer = new MutationObserver(() => {
        el = check();
        if (el) {
          observer.disconnect();
          resolve(el);
        }
      });

      observer.observe(document.body, {
        childList: true,
        subtree: true
      });

      const timer = setInterval(() => {
        if (Date.now() - start > timeout) {
          clearInterval(timer);
          observer.disconnect();
          resolve(null);
        }

        el = check();
        if (el) {
          clearInterval(timer);
          observer.disconnect();
          resolve(el);
        }
      }, 100);
    });
  }

  // ---------------- Highlight ----------------

  highlightElement(el) {
    this.removeHighlight();

    if (!this.modifiedElements.has(el)) {
      this.modifiedElements.set(el, {
        zIndex: el.style.zIndex,
        position: el.style.position,
        boxShadow: el.style.boxShadow
      });
    }

    if (this.currentStep === 0 && !this.baseElement) {
      this.baseElement = el;
    }

    let zIndex;

    if (el === this.baseElement) {
      zIndex = this.zIndexBase;
    } else {
      this.zIndexStep++;
      zIndex = this.zIndexBase + this.zIndexStep;
    }

    el.style.position = "relative";
    el.style.zIndex = zIndex;
    el.style.boxShadow =
      "0 0 0 4px rgba(255, 0, 0, 1), 0 0 20px rgba(255,0,0,0.7)";

    this.currentElement = el;

    this.startTooltipTracking(el);
  }

  removeHighlight() {
    if (!this.currentElement) return;

    this.currentElement.style.boxShadow = "";
    this.stopTooltipTracking();
  }

  // ---------------- Event system (NEW) ----------------

  getEventConfig(type) {
    const map = {
      click: () => new MouseEvent("click", { bubbles: true, cancelable: true, view: window }),
      contextmenu: () => new MouseEvent("contextmenu", { bubbles: true, cancelable: true, view: window, button: 2 }),
      dblclick: () => new MouseEvent("dblclick", { bubbles: true, cancelable: true, view: window }),
      mouseenter: () => new MouseEvent("mouseenter", { bubbles: true, cancelable: true, view: window }),
      mouseover: () => new MouseEvent("mouseover", { bubbles: true, cancelable: true, view: window })
    };

    return map[type] ? map[type]() : null;
  }

  async executeStepOnly(step, el) {
    if (!step.action) return;

    const event = this.getEventConfig(step.action);

    if (event) {
      el.dispatchEvent(event);
    }
  }

  waitForUserEvent(el, type) {
    return new Promise(resolve => {
      const handler = (e) => {
        el.removeEventListener(type, handler);
        resolve(e);
      };

      el.addEventListener(type, handler);
    });
  }

  // ---------------- Tooltip tracking ----------------

  startTooltipTracking(el) {
    this.stopTooltipTracking();

    this.currentStepElement = el;

    const update = () => {
      if (!this.currentStepElement || !this.tooltip) return;

      const rect = this.currentStepElement.getBoundingClientRect();

      this.tooltip.style.top = rect.bottom + 10 + "px";
      this.tooltip.style.left = rect.left + "px";

      this.tooltipRAF = requestAnimationFrame(update);
    };

    this.tooltipObserver = new ResizeObserver(() => {
      if (!this.currentStepElement) return;

      const rect = this.currentStepElement.getBoundingClientRect();

      this.tooltip.style.top = rect.bottom + 10 + "px";
      this.tooltip.style.left = rect.left + "px";
    });

    this.tooltipObserver.observe(el);

    this.tooltipRAF = requestAnimationFrame(update);
  }

  stopTooltipTracking() {
    if (this.tooltipObserver) {
      this.tooltipObserver.disconnect();
      this.tooltipObserver = null;
    }

    if (this.tooltipRAF) {
      cancelAnimationFrame(this.tooltipRAF);
      this.tooltipRAF = null;
    }

    this.currentStepElement = null;
  }

  // ---------------- Steps ----------------

  async showStep() {
    let step = this.steps[this.currentStep];
    this.updateButtons(step);


    this.isWaitingForEvent = false;

    while (step && (!step.text || step.text.trim() === "")) {
      const elSilent = await this.waitForElement(step.element);

      if (elSilent) {
        await this.executeStepOnly(step, elSilent);
      }

      this.currentStep++;

      if (this.currentStep >= this.steps.length) {
        this.destroy();
        return;
      }

      step = this.steps[this.currentStep];
    }

    const el = await this.waitForElement(step.element);

    if (!el) {
      this.next();
      return;
    }

    this.highlightElement(el);

    el.scrollIntoView({ behavior: "smooth", block: "center" });

    const rect = el.getBoundingClientRect();

    this.tooltip.style.display = "block";
    this.text.innerHTML = step.text;

    this.tooltip.style.top = rect.bottom + 10 + "px";
    this.tooltip.style.left = rect.left + "px";

    this.isWaitingForEvent = !!step.waitFor;

    this.nextBtn.style.display = step.waitFor ? "none" : "inline-block";
    this.prevBtn.style.display =
      this.currentStep === 0 || step.waitFor ? "none" : "inline-block";

    if (step.waitFor) {
      await this.waitForUserEvent(el, step.waitFor);
      this.isWaitingForEvent = false;
      this.next();
    }
  }

    updateButtons(step) {
    const isLastStep = this.currentStep === this.steps.length - 1;

    this.nextBtn.innerHTML = isLastStep ? "Fertig" : ">";
    }


  // ---------------- Navigation ----------------

  start() {
    if (this.isRunning) return;

    this.isRunning = true;
    this.createUI();
    this.currentStep = 0;
    this.showStep();
  }

  next() {
    if (this.isWaitingForEvent) return;

    this.removeHighlight();

    if (this.currentStep < this.steps.length - 1) {
      this.currentStep++;
      this.showStep();
    } else {
      this.destroy();
    }
  }

  prev() {
    if (this.isWaitingForEvent) return;

    this.removeHighlight();

    if (this.currentStep > 0) {
      this.currentStep--;
      this.showStep();
    }
  }

  // ---------------- Cleanup ----------------

  destroy() {
    this.isRunning = false;

    this.stopTooltipTracking();

    this.modifiedElements.forEach((styles, el) => {
      el.style.zIndex = styles.zIndex || "";
      el.style.position = styles.position || "";
      el.style.boxShadow = styles.boxShadow || "";
    });

    this.modifiedElements.clear();
    this.baseElement = null;
    this.zIndexStep = 0;

    this.tooltip?.remove();
  }
}