// ===== Configuration =====
const API_BASE = "";

// ===== DOM Elements =====
const form = document.getElementById("researchForm");
const categoryInput = document.getElementById("productCategory");
const descriptionInput = document.getElementById("productDescription");
const submitBtn = document.getElementById("submitBtn");
const btnText = submitBtn.querySelector(".btn-text");
const btnLoader = submitBtn.querySelector(".btn-loader");
const errorBanner = document.getElementById("errorBanner");
const resultsDiv = document.getElementById("results");
const toggleBtns = document.querySelectorAll(".toggle-btn");

// Multi-select elements
const multiselect = document.getElementById("audienceMultiselect");
const selectedContainer = document.getElementById("selectedAudiences");
const dropdown = document.getElementById("audienceDropdown");
const searchInput = document.getElementById("audienceSearch");
const optionsContainer = document.getElementById("audienceOptions");

let selectedMethod = "gpt";
let selectedAudiences = [];
let allAudiences = [];

// ===== Load Target Audiences =====
async function loadAudiences() {
  try {
    const res = await fetch(`${API_BASE}/api/target-audiences`);
    if (!res.ok) throw new Error("Failed to load audiences");
    const data = await res.json();
    allAudiences = data.audiences;
    renderOptions();
    renderSelected();
  } catch (err) {
    console.error("Could not load audiences:", err);
    selectedContainer.innerHTML =
      '<span class="multiselect-placeholder">⚠ Could not load — is the backend running?</span>';
  }
}

// ===== Multi-select Logic (UNCHANGED) =====
function renderOptions(filter = "") {
  const filterLower = filter.toLowerCase();
  const filtered = allAudiences.filter((a) =>
    a.toLowerCase().includes(filterLower)
  );

  optionsContainer.innerHTML = filtered
    .map((a) => {
      const isSelected = selectedAudiences.includes(a);
      return `
        <div class="multiselect-option ${isSelected ? "selected" : ""}" data-value="${escapeAttr(a)}">
          <span class="check">${isSelected ? "✓" : ""}</span>
          <span>${escapeHtml(a)}</span>
        </div>
      `;
    })
    .join("");

  optionsContainer.querySelectorAll(".multiselect-option").forEach((opt) => {
    opt.addEventListener("click", () => {
      const val = opt.dataset.value;
      if (selectedAudiences.includes(val)) {
        selectedAudiences = selectedAudiences.filter((a) => a !== val);
      } else {
        selectedAudiences.push(val);
      }
      renderOptions(searchInput.value);
      renderSelected();
    });
  });
}

function renderSelected() {
  if (selectedAudiences.length === 0) {
    selectedContainer.innerHTML =
      '<span class="multiselect-placeholder">Select target audiences…</span>';
    return;
  }

  selectedContainer.innerHTML = selectedAudiences
    .map(
      (a) => `
      <span class="multiselect-tag">
        ${escapeHtml(a)}
        <span class="multiselect-tag-remove" data-value="${escapeAttr(a)}">×</span>
      </span>
    `
    )
    .join("");

  selectedContainer.querySelectorAll(".multiselect-tag-remove").forEach((btn) => {
    btn.addEventListener("click", (e) => {
      e.stopPropagation();
      const val = btn.dataset.value;
      selectedAudiences = selectedAudiences.filter((a) => a !== val);
      renderOptions(searchInput.value);
      renderSelected();
    });
  });
}

selectedContainer.addEventListener("click", () => {
  dropdown.classList.toggle("hidden");
});

document.addEventListener("click", (e) => {
  if (!multiselect.contains(e.target)) {
    dropdown.classList.add("hidden");
  }
});

searchInput.addEventListener("input", () => {
  renderOptions(searchInput.value);
});

dropdown.addEventListener("click", (e) => {
  e.stopPropagation();
});

// ===== Method Toggle =====
toggleBtns.forEach((btn) => {
  btn.addEventListener("click", () => {
    toggleBtns.forEach((b) => b.classList.remove("active"));
    btn.classList.add("active");
    selectedMethod = btn.dataset.method;
  });
});

// ===== Form Submit =====
form.addEventListener("submit", async (e) => {
  e.preventDefault();
  hideError();
  hideResults();

  const payload = {
    target_audience: selectedAudiences,
    product_category: categoryInput.value.trim(),
    product_description: descriptionInput.value.trim(),
    method: selectedMethod,
  };

  if (
    payload.target_audience.length === 0 ||
    !payload.product_category ||
    !payload.product_description
  ) {
    showError(
      "Please fill in all fields and select at least one target audience."
    );
    return;
  }

  setLoading(true);

  try {
    const res = await fetch(`${API_BASE}/api/research`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(payload),
    });

    if (!res.ok) throw new Error("Server error");

    const data = await res.json();
    renderResults(data.results, selectedMethod);
  } catch (err) {
    showError(err.message || "Something went wrong.");
  } finally {
    setLoading(false);
  }
});

// =====================================================
// ✅ NEW RESULTS (VERTICAL NESTED COLLAPSIBLE)
// =====================================================
function renderResults(audienceResults, method) {
  const badge =
    method === "gpt"
      ? `<span class="results-badge gpt">GPT</span>`
      : `<span class="results-badge claude">Claude</span>`;

  let html = `
    <div class="results-header">
      <h2 class="results-title">Results</h2>
      ${badge}
    </div>
    <div class="audience-stack">
  `;

  audienceResults.forEach((group, groupIndex) => {
    html += `
      <div class="audience-card ${groupIndex === 0 ? "open" : ""}">
        <div class="audience-card-header">
          <div class="audience-header-left">
            <span>👥</span>
            <h3>${escapeHtml(group.target_audience)}</h3>
          </div>
          <span class="audience-chevron">▾</span>
        </div>

        <div class="audience-card-body">
    `;

    group.output.forEach((item, idx) => {
      html += `
        <div class="trigger-card ${idx === 0 && groupIndex === 0 ? "open" : ""}">
          <div class="trigger-header">
            <div>
              <span class="trigger-label">Trigger ${idx + 1}</span>
              <h4 class="trigger-name">${escapeHtml(item.phsychologyTriggers)}</h4>
            </div>
            <span class="trigger-chevron">▾</span>
          </div>

          <div class="trigger-body">
            <div class="trigger-section">
              <p class="section-title">Ad Angles</p>
              <ul class="section-list">
                ${item.angles.map((a) => `<li>${escapeHtml(a)}</li>`).join("")}
              </ul>
            </div>

            <div class="trigger-section">
              <p class="section-title">Ad Concepts</p>
              <ul class="section-list">
                ${item.concepts.map((c) => `<li>${escapeHtml(c)}</li>`).join("")}
              </ul>
            </div>
          </div>
        </div>
      `;
    });

    html += `
        </div>
      </div>
    `;
  });

  html += `</div>`;

  resultsDiv.innerHTML = html;
  resultsDiv.classList.remove("hidden");

  attachAccordionEvents();
}

// ===== Accordion Logic =====
function attachAccordionEvents() {
  document.querySelectorAll(".audience-card-header").forEach((header) => {
    header.addEventListener("click", () => {
      const card = header.parentElement;
      card.classList.toggle("open");
    });
  });

  document.querySelectorAll(".trigger-header").forEach((header) => {
    header.addEventListener("click", () => {
      const card = header.parentElement;

      // Close siblings
      const siblings = card.parentElement.querySelectorAll(".trigger-card");
      siblings.forEach((s) => {
        if (s !== card) s.classList.remove("open");
      });

      card.classList.toggle("open");
    });
  });
}

// ===== Helpers =====
function setLoading(isLoading) {
  submitBtn.disabled = isLoading;
  btnText.classList.toggle("hidden", isLoading);
  btnLoader.classList.toggle("hidden", !isLoading);
}

function showError(msg) {
  errorBanner.textContent = msg;
  errorBanner.classList.remove("hidden");
}

function hideError() {
  errorBanner.classList.add("hidden");
}

function hideResults() {
  resultsDiv.classList.add("hidden");
}

function escapeHtml(str) {
  const div = document.createElement("div");
  div.textContent = str;
  return div.innerHTML;
}

function escapeAttr(str) {
  return str.replace(/"/g, "&quot;").replace(/'/g, "&#39;");
}

loadAudiences();