const elements = {
  scanButton: document.getElementById("scan-button"),
  clearButton: document.getElementById("clear-button"),
  status: document.getElementById("status"),
  summary: document.getElementById("summary"),
  scannedCount: document.getElementById("scanned-count"),
  flaggedCount: document.getElementById("flagged-count"),
  minimumScore: document.getElementById("minimum-score"),
  pageLabel: document.getElementById("page-label"),
  results: document.getElementById("results"),
  apiUrl: document.getElementById("api-url"),
  minimumScoreInput: document.getElementById("minimum-score-input"),
  maxItems: document.getElementById("max-items"),
  saveSettings: document.getElementById("save-settings"),
  testConnection: document.getElementById("test-connection"),
};

function setStatus(message, tone = "neutral") {
  elements.status.textContent = message;
  elements.status.dataset.tone = tone;
}

function setBusy(busy) {
  elements.scanButton.disabled = busy;
  elements.clearButton.disabled = busy;
  elements.scanButton.textContent = busy ? "Scanning page..." : "Scan current page";
}

function sendMessage(message) {
  return chrome.runtime.sendMessage(message);
}

function createFinding(result) {
  const card = document.createElement("article");
  card.className = "finding";
  card.dataset.severity = result.severity || "medium";

  const header = document.createElement("div");
  header.className = "finding-header";
  const type = document.createElement("span");
  type.className = "finding-type";
  type.textContent = result.prediction;
  const score = document.createElement("span");
  score.className = "score";
  score.textContent = `${result.confidence}% ${result.confidenceBand}`;
  header.append(type, score);

  const evidence = document.createElement("p");
  evidence.className = "evidence";
  evidence.textContent = result.text;

  const phrases = document.createElement("div");
  phrases.className = "phrases";
  const phraseText = (result.explanation || [])
    .map((item) => item.phrase)
    .join(", ");
  phrases.textContent = phraseText
    ? `Trigger phrases: ${phraseText}`
    : "No stable word-level explanation available.";

  const locate = document.createElement("button");
  locate.className = "locate";
  locate.textContent = "Locate on page";
  locate.addEventListener("click", async () => {
    const response = await sendMessage({
      type: "FOCUS_RESULT",
      elementId: result.id,
    });
    if (!response?.ok) {
      setStatus(response?.error || "Could not locate the element.", "error");
    }
  });

  card.append(header, evidence, phrases, locate);
  return card;
}

function renderScan(response) {
  elements.summary.hidden = false;
  elements.scannedCount.textContent = response.scanned;
  elements.flaggedCount.textContent = response.flagged;
  elements.minimumScore.textContent = `${response.minimumScore || 0}%`;
  elements.pageLabel.textContent = response.page?.title || "";
  elements.results.replaceChildren();

  if (!response.results?.length) {
    const empty = document.createElement("p");
    empty.className = "empty";
    empty.textContent = "No visible text exceeded the current review threshold.";
    elements.results.appendChild(empty);
    return;
  }

  for (const result of response.results) {
    elements.results.appendChild(createFinding(result));
  }
}

async function runScan() {
  setBusy(true);
  setStatus("Collecting visible interface text and running the NLP model...");
  try {
    const response = await sendMessage({ type: "RUN_SCAN" });
    if (!response?.ok) {
      throw new Error(response?.error || "Scan failed.");
    }
    renderScan(response);
    setStatus(
      `Audit complete. ${response.flagged} of ${response.scanned} texts require review.`,
      "success",
    );
  } catch (error) {
    setStatus(error.message, "error");
  } finally {
    setBusy(false);
  }
}

async function clearHighlights() {
  const response = await sendMessage({ type: "CLEAR_HIGHLIGHTS" });
  if (!response?.ok) {
    setStatus(response?.error || "Could not clear highlights.", "error");
    return;
  }
  setStatus("Page highlights cleared.", "success");
}

async function loadSettings() {
  const response = await sendMessage({ type: "GET_SETTINGS" });
  if (!response?.ok) {
    setStatus(response?.error || "Could not load settings.", "error");
    return;
  }
  elements.apiUrl.value = response.apiUrl;
  elements.minimumScoreInput.value = response.minimumScore;
  elements.maxItems.value = response.maxItems;
}

async function saveSettings() {
  const response = await sendMessage({
    type: "SAVE_SETTINGS",
    settings: {
      apiUrl: elements.apiUrl.value,
      minimumScore: elements.minimumScoreInput.value,
      maxItems: elements.maxItems.value,
    },
  });
  if (!response?.ok) {
    setStatus(response?.error || "Could not save settings.", "error");
    return;
  }
  setStatus("Settings saved.", "success");
}

async function testConnection() {
  setStatus("Testing local API connection...");
  const response = await sendMessage({ type: "TEST_CONNECTION" });
  if (!response?.ok) {
    setStatus(response?.error || "API connection failed.", "error");
    return;
  }
  setStatus("Local NLP API is ready and calibrated.", "success");
}

elements.scanButton.addEventListener("click", runScan);
elements.clearButton.addEventListener("click", clearHighlights);
elements.saveSettings.addEventListener("click", saveSettings);
elements.testConnection.addEventListener("click", testConnection);

loadSettings();