// Feedback modal — triggered by scroll-to-bottom after review loads.
// Step-by-step: each question appears after the previous is answered.
// Shares API_BASE and currentKey exposed by review.js on window.

document.addEventListener("DOMContentLoaded", function () {
  const TOTAL_STEPS = 4; // step 5 is success screen
  const SHOWN_KEY = "pm_feedback_shown";

  let currentStep = 1;
  const answers = {};

  const overlay   = document.getElementById("feedback-modal");
  const closeBtn  = document.getElementById("fb-modal-close");
  const progressBar = document.getElementById("fb-progress-bar");
  const stepNumEl = document.getElementById("fb-step-num");
  const fbComments = document.getElementById("fb-comments");
  const fbCharNum  = document.getElementById("fb-char-num");
  const fbError    = document.getElementById("fb-error");
  const skipBtn    = document.getElementById("fb-skip-btn");
  const submitBtn  = document.getElementById("fb-submit-btn");

  // ── Open / Close ───────────────────────────────────────────────────────────
  function openModal() {
    overlay.classList.add("open");
    showStep(1);
  }

  function closeModal() {
    overlay.classList.remove("open");
  }

  closeBtn.addEventListener("click", closeModal);
  overlay.addEventListener("click", (e) => {
    if (e.target === overlay) closeModal();
  });
  document.addEventListener("keydown", (e) => {
    if (e.key === "Escape") closeModal();
  });

  // ── Progress bar ───────────────────────────────────────────────────────────
  function updateProgress(step) {
    const pct = ((step - 1) / TOTAL_STEPS) * 100;
    progressBar.style.width = pct + "%";
    stepNumEl.textContent = Math.min(step, TOTAL_STEPS);
  }

  // ── Step navigation ────────────────────────────────────────────────────────
  const modalBox = overlay.querySelector(".fb-modal-box");

  function showStep(n) {
    const steps = document.querySelectorAll(".fb-step");
    steps.forEach((s) => s.classList.remove("active"));

    const next = document.querySelector(`.fb-step[data-step="${n}"]`);
    if (!next) return;

    next.classList.add("active");
    currentStep = n;
    updateProgress(n);
  }

  function advanceStep() {
    showStep(currentStep + 1);
  }

  // ── Chip selection (steps 1-3) ─────────────────────────────────────────────
  document.querySelectorAll(".fb-chip").forEach((chip) => {
    chip.addEventListener("click", () => {
      const name  = chip.dataset.name;
      const value = chip.dataset.value;

      // Highlight selected chip in group
      const group = chip.closest(".fb-chip-group");
      group.querySelectorAll(".fb-chip").forEach((c) => c.classList.remove("selected"));
      chip.classList.add("selected");

      answers[name] = value;

      // Auto-advance after short delay so user sees the selection
      setTimeout(() => advanceStep(), 340);
    });
  });

  // ── Step 4: comment ────────────────────────────────────────────────────────
  if (fbComments) {
    fbComments.addEventListener("input", () => {
      fbCharNum.textContent = fbComments.value.length;
    });
  }

  skipBtn?.addEventListener("click", () => submitFeedback(""));
  submitBtn?.addEventListener("click", () => submitFeedback(fbComments?.value.trim() || ""));

  // ── Submit ─────────────────────────────────────────────────────────────────
  async function submitFeedback(comment) {
    fbError.style.display = "none";

    const key = window.currentKey;
    if (!key) {
      fbError.textContent = "Cannot identify the review. Please reload and try again.";
      fbError.style.display = "block";
      return;
    }

    submitBtn.disabled = true;
    skipBtn.disabled   = true;
    submitBtn.innerHTML = '<i class="ri-loader-4-line spin"></i> Submitting…';

    try {
      const resp = await fetch(`${window.API_BASE}/api/feedback/${encodeURIComponent(key)}`, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          helpfulness:       answers.helpfulness      || null,
          has_critical_error: answers.has_critical_error === "true",
          has_suggestions:    answers.has_suggestions   === "true",
          comments: comment,
        }),
      });

      if (!resp.ok) {
        const data = await resp.json().catch(() => ({}));
        fbError.textContent = data.detail || "Failed to submit. Please try again.";
        fbError.style.display = "block";
        submitBtn.disabled = false;
        skipBtn.disabled   = false;
        submitBtn.innerHTML = '<i class="ri-send-plane-line"></i> Submit';
        return;
      }

      // Success step
      progressBar.style.width = "100%";
      showStep(5);
      setTimeout(() => closeModal(), 2800);

    } catch {
      fbError.textContent = "Network error. Make sure the server is running.";
      fbError.style.display = "block";
      submitBtn.disabled = false;
      skipBtn.disabled   = false;
      submitBtn.innerHTML = '<i class="ri-send-plane-line"></i> Submit';
    }
  }

  // ── Scroll trigger ─────────────────────────────────────────────────────────
  // Fire once when user reaches bottom, but only after review is rendered.
  // review.js sets reviewContent.style.display = "block" when done.
  let triggered = false;
  let reviewReady = false;  // set to true by review.js after renderReview()

  function checkScrollTrigger() {
    if (triggered || !reviewReady) return;

    const scrolled  = window.scrollY + window.innerHeight;
    const docHeight = document.documentElement.scrollHeight;

    if (scrolled >= docHeight - 200) {
      triggered = true;
      setTimeout(openModal, 2000);
    }
  }

  window.addEventListener("scroll", checkScrollTrigger, { passive: true });

  // Called by review.js after renderReview() finishes — arms the trigger
  // and immediately checks in case user is already near the bottom
  window.onReviewReady = () => {
    reviewReady = true;
    triggered = false;
    // Short delay to let DOM settle after render
    setTimeout(checkScrollTrigger, 300);
  };
});