const STACK_OPTIONS = {
  language: ["Auto", "Python", "JavaScript", "TypeScript", "Java"],
  frontend: ["Auto", "None", "HTML/CSS/JavaScript", "React", "Next.js", "Vue"],
  backend: ["Auto", "None", "FastAPI", "Flask", "Express", "NestJS", "Spring Boot"],
  database: ["Auto", "None", "SQLite", "PostgreSQL", "MySQL", "MongoDB"],
  aiTools: ["Auto", "None", "Ollama", "OpenAI API", "LangChain"],
  deployment: ["Auto", "None", "Render", "Railway", "Vercel", "Docker"],
};

const ideaInput = document.getElementById("ideaInput");
const suggestButton = document.getElementById("suggestButton");
const continueButton = document.getElementById("continueButton");
const skipQuestionsButton = document.getElementById("skipQuestionsButton");
const generateProjectButton = document.getElementById("generateProjectButton");
const regenerateButton = document.getElementById("regenerateButton");
const confirmButton = document.getElementById("confirmButton");
const clearButton = document.getElementById("clearButton");
const statusMessage = document.getElementById("statusMessage");
const generationModeSelect = document.getElementById("generationModeSelect");

const agentSection = document.getElementById("agentSection");
const advancedStackSection = document.getElementById("advancedStackSection");
const previewSection = document.getElementById("previewSection");
const downloadSection = document.getElementById("downloadSection");

const agentUnderstandingText = document.getElementById("agentUnderstandingText");
const agentAssumptionsList = document.getElementById("agentAssumptionsList");
const agentSuggestedStackList = document.getElementById("agentSuggestedStackList");
const questionCards = document.getElementById("questionCards");
const finalizeCard = document.getElementById("finalizeCard");
const finalizeSummaryText = document.getElementById("finalizeSummaryText");
const finalSelectedStackList = document.getElementById("finalSelectedStackList");
const finalRequirementsText = document.getElementById("finalRequirementsText");

const projectNameHeading = document.getElementById("projectNameHeading");
const detectedChoicesList = document.getElementById("detectedChoicesList");
const stackChips = document.getElementById("stackChips");
const selectedStackList = document.getElementById("selectedStackList");
const chosenStackList = document.getElementById("chosenStackList");
const assumptionsList = document.getElementById("assumptionsList");
const summaryText = document.getElementById("summaryText");
const problemStatementText = document.getElementById("problemStatementText");
const architectureList = document.getElementById("architectureList");
const packageRequirementsList = document.getElementById("packageRequirementsList");
const installCommandsList = document.getElementById("installCommandsList");
const runCommandsList = document.getElementById("runCommandsList");
const envVariablesList = document.getElementById("envVariablesList");
const requiredInputsBody = document.getElementById("requiredInputsBody");
const modulesList = document.getElementById("modulesList");
const fileTreeBlock = document.getElementById("fileTreeBlock");
const filesList = document.getElementById("filesList");
const downloadText = document.getElementById("downloadText");
const downloadLink = document.getElementById("downloadLink");

const stackSelects = {
  language: document.getElementById("languageSelect"),
  frontend: document.getElementById("frontendSelect"),
  backend: document.getElementById("backendSelect"),
  database: document.getElementById("databaseSelect"),
  aiTools: document.getElementById("aiToolsSelect"),
  deployment: document.getElementById("deploymentSelect"),
};

let baseIdea = "";
let agentAnalysis = null;
let agentAnswers = {};
let finalRequirements = "";
let currentPreview = null;
let selectedStack = getDefaultStackState();
let currentQuestionIndex = 0;
let currentQuestionDraft = "";
let showingSuggestion = false;

initializeStackSelectors();
refreshUiState();

suggestButton.addEventListener("click", handleStartAgent);
continueButton.addEventListener("click", handleContinueAgent);
skipQuestionsButton.addEventListener("click", handleSkipQuestions);
generateProjectButton.addEventListener("click", handleGenerateProject);
regenerateButton.addEventListener("click", handleRegenerate);
confirmButton.addEventListener("click", handleConfirmZip);
clearButton.addEventListener("click", resetAll);

Object.values(stackSelects).forEach((select) => {
  select.addEventListener("change", handleStackChange);
});

function initializeStackSelectors() {
  Object.entries(stackSelects).forEach(([key, select]) => {
    STACK_OPTIONS[key].forEach((option) => {
      const optionElement = document.createElement("option");
      optionElement.value = option;
      optionElement.textContent = option;
      select.appendChild(optionElement);
    });
  });
  applySelectedStackToControls(getDefaultStackState());
}

function getDefaultStackState() {
  return {
    language: "Auto",
    frontend: "Auto",
    backend: "Auto",
    database: "Auto",
    aiTools: "Auto",
    deployment: "Auto",
  };
}

function getQuestionList() {
  return Array.isArray(agentAnalysis?.questions) ? agentAnalysis.questions : [];
}

function getCurrentQuestion() {
  const questions = getQuestionList();
  return questions[currentQuestionIndex] || null;
}

function getStoredAnswer(questionId) {
  return typeof agentAnswers[questionId] === "string" ? agentAnswers[questionId] : "";
}

function setQuestionDraft(value) {
  currentQuestionDraft = String(value || "");
}

function resetQuestionFlow() {
  currentQuestionIndex = 0;
  currentQuestionDraft = "";
  showingSuggestion = false;
}

function collectSelectedStack() {
  return {
    language: stackSelects.language.value,
    frontend: stackSelects.frontend.value,
    backend: stackSelects.backend.value,
    database: stackSelects.database.value,
    aiTools: stackSelects.aiTools.value,
    deployment: stackSelects.deployment.value,
  };
}

function applySelectedStackToControls(stack) {
  const safeStack = stack || getDefaultStackState();
  Object.entries(stackSelects).forEach(([key, select]) => {
    select.value = safeStack[key] || "Auto";
  });
  selectedStack = collectSelectedStack();
}

function handleStackChange() {
  selectedStack = collectSelectedStack();
  refreshUiState();
}

function setStatus(message, type) {
  statusMessage.hidden = false;
  statusMessage.className = `status-message ${type}`;
  statusMessage.textContent = message;
}

function clearStatus() {
  statusMessage.hidden = true;
  statusMessage.className = "status-message";
  statusMessage.textContent = "";
}

function setBusy(isBusy, message = "Working...") {
  suggestButton.disabled = isBusy;
  continueButton.disabled = isBusy || !agentAnalysis;
  skipQuestionsButton.disabled = isBusy || !agentAnalysis;
  generateProjectButton.disabled = isBusy || !finalRequirements;
  regenerateButton.disabled = isBusy || !currentPreview;
  confirmButton.disabled = isBusy || !currentPreview;
  clearButton.disabled = isBusy && !baseIdea && !currentPreview && !agentAnalysis;
  generationModeSelect.disabled = isBusy;
  Object.values(stackSelects).forEach((select) => {
    select.disabled = isBusy || !agentAnalysis;
  });
  if (isBusy) {
    setStatus(message, "loading");
  }
}

function refreshUiState() {
  continueButton.disabled = !agentAnalysis;
  skipQuestionsButton.disabled = !agentAnalysis;
  generateProjectButton.disabled = !finalRequirements;
  regenerateButton.disabled = !currentPreview;
  confirmButton.disabled = !currentPreview;
  clearButton.disabled = !baseIdea && !currentPreview && !agentAnalysis;
  Object.values(stackSelects).forEach((select) => {
    select.disabled = !agentAnalysis;
  });

  const questions = getQuestionList();
  const hasQuestionFlow = !!agentAnalysis && questions.length > 0 && !finalRequirements;
  if (hasQuestionFlow) {
    continueButton.disabled = showingSuggestion;
    continueButton.textContent = currentQuestionIndex >= questions.length - 1 ? "Finish Questions" : "Next";
  } else if (!!agentAnalysis && !finalRequirements) {
    continueButton.textContent = "Continue";
  } else {
    continueButton.textContent = "Next";
  }
}

async function handleStartAgent() {
  const idea = ideaInput.value.trim();
  if (!idea) {
    setStatus("Please enter a project idea before starting the agent.", "error");
    return;
  }

  baseIdea = idea;
  currentPreview = null;
  finalRequirements = "";
  agentAnswers = {};
  resetQuestionFlow();
  previewSection.hidden = true;
  downloadSection.hidden = true;
  finalizeCard.hidden = true;
  setBusy(true, "Analyzing your idea...");

  try {
    const payload = await requestAgentAnalysis(idea);
    agentAnalysis = payload;
    selectedStack = payload.suggestedStack || getDefaultStackState();
    applySelectedStackToControls(selectedStack);
    renderAgentAnalysis(payload);
    agentSection.hidden = false;
    advancedStackSection.hidden = false;
    setStatus("The agent reviewed your idea. Answer the questions one by one or skip and use the suggested defaults.", "success");
  } catch (error) {
    agentAnalysis = null;
    agentSection.hidden = true;
    advancedStackSection.hidden = true;
    setStatus(error.message || "Could not start the agent.", "error");
  } finally {
    clearBusyState();
  }
}

async function handleContinueAgent() {
  if (!baseIdea || !agentAnalysis) {
    setStatus("Start the agent before continuing.", "error");
    return;
  }

  const question = getCurrentQuestion();
  if (!question) {
    await finalizeConversationOnly();
    return;
  }

  const typedAnswer = currentQuestionDraft.trim();
  if (!typedAnswer) {
    showingSuggestion = true;
    renderQuestionFlow();
    setStatus("No answer was entered. Review the suggested default or edit your answer.", "info");
    return;
  }

  storeQuestionAnswer(question.id, typedAnswer);
  moveToNextQuestion();
}

async function handleSkipQuestions() {
  if (!baseIdea || !agentAnalysis) {
    setStatus("Start the agent before skipping questions.", "error");
    return;
  }

  downloadSection.hidden = true;
  setBusy(true, "Generating project with suggested defaults...");

  try {
    await finalizeAgentConversation({ fillDefaults: true });
    await generatePreviewFromCurrentState(
      "Preview ready. Review the generated project, regenerate if needed, then confirm to create the ZIP.",
    );
  } catch (error) {
    currentPreview = null;
    previewSection.hidden = true;
    setStatus(error.message || "Could not generate the project from the suggested defaults.", "error");
  } finally {
    clearBusyState();
  }
}

async function handleGenerateProject() {
  if (!baseIdea || !finalRequirements) {
    setStatus("Finalize the agent conversation before generating the project.", "error");
    return;
  }

  downloadSection.hidden = true;
  setBusy(true, "Generating project preview...");

  try {
    await generatePreviewFromCurrentState(
      "Preview ready. Review the generated project, regenerate if needed, then confirm to create the ZIP.",
    );
  } catch (error) {
    currentPreview = null;
    previewSection.hidden = true;
    setStatus(error.message || "Could not generate the project preview.", "error");
  } finally {
    clearBusyState();
  }
}

async function handleRegenerate() {
  if (!baseIdea || !currentPreview) {
    setStatus("Generate a preview before regenerating with the selected stack.", "error");
    return;
  }

  downloadSection.hidden = true;
  setBusy(true, "Generating project preview...");

  try {
    await generatePreviewFromCurrentState(
      "Preview regenerated with the latest requirements and selected stack.",
    );
  } catch (error) {
    setStatus(error.message || "Could not regenerate the preview.", "error");
  } finally {
    clearBusyState();
  }
}

async function handleConfirmZip() {
  if (!currentPreview) {
    setStatus("Generate a preview before creating a ZIP.", "error");
    return;
  }

  setBusy(true, "Creating ZIP from the latest accepted preview...");

  try {
    const response = await fetch("/api/zip", {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
      },
      body: JSON.stringify({
        preview: currentPreview,
      }),
    });

    const payload = await response.json();
    if (!response.ok) {
      throw new Error(payload.detail || "Could not create the ZIP.");
    }

    downloadLink.href = payload.downloadUrl;
    downloadLink.download = payload.filename;
    downloadText.textContent = `Your generated project ZIP is ready: ${payload.filename}`;
    downloadSection.hidden = false;
    setStatus("ZIP created successfully. You can download it now.", "success");
  } catch (error) {
    setStatus(error.message || "Could not create the ZIP.", "error");
  } finally {
    clearBusyState();
  }
}

async function requestAgentAnalysis(idea) {
  const response = await fetch("/api/agent/analyze", {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    body: JSON.stringify({ idea }),
  });

  const payload = await response.json();
  if (!response.ok) {
    throw new Error(payload.detail || "Could not analyze the idea.");
  }
  return payload;
}

async function requestAgentFinalize(body) {
  const response = await fetch("/api/agent/finalize", {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    body: JSON.stringify(body),
  });

  const payload = await response.json();
  if (!response.ok) {
    throw new Error(payload.detail || "Could not finalize the requirements.");
  }
  return payload;
}

async function requestPreview(body) {
  const response = await fetch("/api/suggest", {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      generationMode: generationModeSelect.value || "fast",
      ...body,
    }),
  });

  const payload = await response.json();
  if (!response.ok) {
    throw new Error(payload.detail || "Could not generate a preview.");
  }
  return payload;
}

function renderAgentAnalysis(analysis) {
  agentUnderstandingText.textContent = analysis.understanding || "No understanding available.";
  renderList(agentAssumptionsList, analysis.assumptions, "No assumptions recorded.");
  renderStackSummary(agentSuggestedStackList, analysis.suggestedStack || getDefaultStackState());
  resetQuestionFlow();
  renderQuestionFlow();
}

function renderQuestionFlow() {
  questionCards.replaceChildren();

  const questions = getQuestionList();
  if (questions.length === 0) {
    const empty = document.createElement("p");
    empty.className = "text-block";
    empty.textContent = "No follow-up questions are needed. Continue to finalize the recommended stack or skip straight to generation.";
    questionCards.appendChild(empty);
    refreshUiState();
    return;
  }

  const question = getCurrentQuestion();
  if (!question) {
    const completed = document.createElement("p");
    completed.className = "text-block";
    completed.textContent = "All important questions are complete. Continue to finalize your requirements.";
    questionCards.appendChild(completed);
    refreshUiState();
    return;
  }

  if (!currentQuestionDraft && getStoredAnswer(question.id) && !showingSuggestion) {
    setQuestionDraft(getStoredAnswer(question.id));
  }

  const card = document.createElement("article");
  card.className = "question-card active-question-card";

  const position = document.createElement("p");
  position.className = "question-position";
  position.textContent = `Question ${currentQuestionIndex + 1} of ${questions.length}`;

  const title = document.createElement("h4");
  title.textContent = question.question || "Question";

  const reason = document.createElement("p");
  reason.className = "question-reason";
  reason.textContent = "Type your preference first. If you leave it blank, the agent will suggest a default and explain why.";

  const inputLabel = document.createElement("label");
  inputLabel.className = "field-label";
  inputLabel.setAttribute("for", "activeQuestionInput");
  inputLabel.textContent = "Your answer";

  const input = document.createElement("input");
  input.type = "text";
  input.id = "activeQuestionInput";
  input.className = "question-input";
  input.placeholder = buildQuestionPlaceholder(question);
  input.value = currentQuestionDraft;
  input.addEventListener("input", (event) => {
    setQuestionDraft(event.target.value);
  });

  card.append(position, title, reason, inputLabel, input);

  if (Array.isArray(question.options) && question.options.length) {
    const optionsHint = document.createElement("p");
    optionsHint.className = "question-hint";
    optionsHint.textContent = `Common choices: ${question.options.join(", ")}`;
    card.appendChild(optionsHint);
  }

  if (showingSuggestion) {
    const suggestionBlock = document.createElement("div");
    suggestionBlock.className = "suggestion-block";

    const suggestionTitle = document.createElement("p");
    suggestionTitle.className = "suggestion-title";
    suggestionTitle.textContent = `Suggested: ${question.default || "No default available"}`;

    const suggestionReason = document.createElement("p");
    suggestionReason.className = "suggestion-reason";
    suggestionReason.textContent = question.reason || "This default keeps the starter simple and runnable.";

    const suggestionActions = document.createElement("div");
    suggestionActions.className = "question-actions";

    const acceptButton = document.createElement("button");
    acceptButton.type = "button";
    acceptButton.className = "secondary-button";
    acceptButton.textContent = "Accept Suggestion";
    acceptButton.addEventListener("click", () => {
      storeQuestionAnswer(question.id, question.default || "");
      moveToNextQuestion();
    });

    const editButton = document.createElement("button");
    editButton.type = "button";
    editButton.className = "ghost-button";
    editButton.textContent = "Edit Answer";
    editButton.addEventListener("click", () => {
      showingSuggestion = false;
      renderQuestionFlow();
      const inputElement = document.getElementById("activeQuestionInput");
      inputElement?.focus();
    });

    suggestionActions.append(acceptButton, editButton);
    suggestionBlock.append(suggestionTitle, suggestionReason, suggestionActions);
    card.appendChild(suggestionBlock);
  }

  questionCards.appendChild(card);
  refreshUiState();
}

function buildQuestionPlaceholder(question) {
  if (Array.isArray(question.options) && question.options.length) {
    return `Example: ${question.options[0]}`;
  }
  return "Type your answer or leave blank for a suggestion";
}

function storeQuestionAnswer(questionId, value) {
  agentAnswers[questionId] = String(value || "").trim();
}

function moveToNextQuestion() {
  showingSuggestion = false;
  currentQuestionIndex += 1;
  currentQuestionDraft = "";

  if (currentQuestionIndex >= getQuestionList().length) {
    renderQuestionFlow();
    void finalizeConversationOnly();
    return;
  }

  renderQuestionFlow();
  clearStatus();
}

async function finalizeConversationOnly() {
  setBusy(true, "Finalizing requirements...");

  try {
    await finalizeAgentConversation({ fillDefaults: false });
    setStatus("Requirements finalized. Generate the project when you are ready.", "success");
  } catch (error) {
    setStatus(error.message || "Could not finalize the requirements.", "error");
  } finally {
    clearBusyState();
  }
}

function buildAnswersPayload(fillDefaults) {
  const answers = { ...agentAnswers };
  if (!fillDefaults) {
    return answers;
  }

  getQuestionList().forEach((question) => {
    if (!answers[question.id]) {
      answers[question.id] = question.default || "";
    }
  });
  return answers;
}

function buildFinalizationSummary(finalizedStack, assumptions) {
  const scope = [
    finalizedStack.frontend && finalizedStack.frontend !== "None" ? finalizedStack.frontend : null,
    finalizedStack.backend && finalizedStack.backend !== "None" ? finalizedStack.backend : null,
  ].filter(Boolean).join(" + ");
  const firstAssumption = Array.isArray(assumptions) && assumptions.length ? assumptions[0] : "";
  return scope
    ? `The starter is now aligned around ${scope}. ${firstAssumption}`.trim()
    : `The starter requirements are finalized. ${firstAssumption}`.trim();
}

function renderFinalization(finalized) {
  finalizeCard.hidden = false;
  finalRequirementsText.textContent = finalized.finalRequirements || "No finalized requirements available.";
  finalizeSummaryText.textContent = buildFinalizationSummary(
    finalized.selectedStack || selectedStack,
    finalized.assumptions || [],
  );
  renderStackSummary(finalSelectedStackList, finalized.selectedStack || selectedStack);
  renderStackSummary(agentSuggestedStackList, finalized.selectedStack || selectedStack);
  const mergedAssumptions = dedupeList([
    ...(Array.isArray(agentAnalysis?.assumptions) ? agentAnalysis.assumptions : []),
    ...(Array.isArray(finalized.assumptions) ? finalized.assumptions : []),
  ]);
  renderList(agentAssumptionsList, mergedAssumptions, "No assumptions recorded.");
  refreshUiState();
}

function clearBusyState() {
  suggestButton.disabled = false;
  generationModeSelect.disabled = false;
  refreshUiState();
}

async function finalizeAgentConversation({ fillDefaults }) {
  const payload = await requestAgentFinalize({
    idea: baseIdea,
    answers: buildAnswersPayload(fillDefaults),
    suggestedStack: collectSelectedStack(),
  });
  finalRequirements = payload.finalRequirements || "";
  selectedStack = payload.selectedStack || selectedStack;
  applySelectedStackToControls(selectedStack);
  renderFinalization(payload);
  return payload;
}

async function generatePreviewFromCurrentState(successMessage) {
  selectedStack = collectSelectedStack();
  const payload = await requestPreview({
    idea: baseIdea,
    selectedStack,
    finalRequirements,
  });
  currentPreview = payload;
  selectedStack = payload.selectedStack || selectedStack;
  renderPreview(payload);
  applySelectedStackToControls(selectedStack);
  setStatus(successMessage, "success");
  return payload;
}

function resetAll() {
  baseIdea = "";
  agentAnalysis = null;
  agentAnswers = {};
  finalRequirements = "";
  currentPreview = null;
  selectedStack = getDefaultStackState();
  resetQuestionFlow();

  ideaInput.value = "";
  clearStatus();
  applySelectedStackToControls(getDefaultStackState());
  agentSection.hidden = true;
  advancedStackSection.hidden = true;
  advancedStackSection.open = false;
  previewSection.hidden = true;
  downloadSection.hidden = true;
  finalizeCard.hidden = true;
  generateProjectButton.disabled = true;
  generationModeSelect.value = "fast";
  generationModeSelect.disabled = false;
  downloadLink.removeAttribute("href");
  downloadLink.removeAttribute("download");
  downloadText.textContent = "Your generated project ZIP is ready.";

  agentUnderstandingText.textContent = "";
  clearCollection(agentAssumptionsList);
  clearCollection(agentSuggestedStackList);
  questionCards.replaceChildren();
  finalizeSummaryText.textContent = "";
  clearCollection(finalSelectedStackList);
  finalRequirementsText.textContent = "";

  clearCollection(detectedChoicesList);
  stackChips.replaceChildren();
  clearCollection(selectedStackList);
  clearCollection(chosenStackList);
  clearCollection(assumptionsList);
  clearCollection(architectureList);
  clearCollection(packageRequirementsList);
  clearCollection(installCommandsList);
  clearCollection(runCommandsList);
  clearCollection(envVariablesList);
  requiredInputsBody.replaceChildren();
  modulesList.replaceChildren();
  filesList.replaceChildren();
  fileTreeBlock.textContent = "";
  summaryText.textContent = "";
  problemStatementText.textContent = "";
  projectNameHeading.textContent = "Generated Project";
  refreshUiState();
}

function renderPreview(preview) {
  previewSection.hidden = false;
  projectNameHeading.textContent = preview.projectName || "Generated Project";
  summaryText.textContent = preview.summary || "No summary available.";
  problemStatementText.textContent = preview.problemStatement || "No problem statement available.";
  fileTreeBlock.textContent = preview.fileTree || "No file tree available.";

  renderList(detectedChoicesList, preview.detectedUserChoices, "No explicit user choices detected.");
  renderStackChips(preview.selectedStack || getDefaultStackState());
  renderStackSummary(selectedStackList, preview.selectedStack || getDefaultStackState());
  renderList(chosenStackList, preview.chosenStack, "No chosen stack details available.");
  renderList(assumptionsList, preview.assumptions, "No assumptions recorded.");
  renderList(architectureList, preview.architecture, "No architecture details available.");
  renderList(packageRequirementsList, preview.packageRequirements, "No package requirements available.");
  renderList(installCommandsList, preview.installCommands, "No install commands available.");
  renderList(runCommandsList, preview.runCommands, "No run commands available.");
  renderRequiredInputs(preview.requiredInputs || []);
  renderEnvVariables(preview.envVariables || []);
  renderModules(preview.modules || []);
  renderFiles(preview.files || []);
}

function renderStackChips(stack) {
  stackChips.replaceChildren();
  const featuredChips = [
    ["language", "Language"],
    ["frontend", "Frontend"],
    ["backend", "Backend"],
    ["database", "Database"],
  ];

  featuredChips.forEach(([key, label]) => {
    const chip = document.createElement("span");
    chip.className = "stack-chip";
    chip.innerHTML = `<strong>${escapeHtml(label)}</strong> ${escapeHtml(stack[key] || "Auto")}`;
    stackChips.appendChild(chip);
  });
}

function renderList(element, items, fallback) {
  clearCollection(element);
  const safeItems = Array.isArray(items) && items.length ? items : [fallback];

  safeItems.forEach((item) => {
    const listItem = document.createElement("li");
    listItem.textContent = item;
    element.appendChild(listItem);
  });
}

function renderStackSummary(element, stack) {
  clearCollection(element);
  const labels = {
    language: "Language",
    frontend: "Frontend",
    backend: "Backend",
    database: "Database",
    aiTools: "AI / Tools",
    deployment: "Deployment",
  };

  Object.entries(labels).forEach(([key, label]) => {
    const listItem = document.createElement("li");
    listItem.textContent = `${label}: ${stack[key] || "Auto"}`;
    element.appendChild(listItem);
  });
}

function renderEnvVariables(envVariables) {
  clearCollection(envVariablesList);
  if (!Array.isArray(envVariables) || envVariables.length === 0) {
    renderList(envVariablesList, [], "No environment variables required.");
    return;
  }

  envVariables.forEach((variable) => {
    const listItem = document.createElement("li");
    const description = variable.description ? ` - ${variable.description}` : "";
    const value = variable.value ? ` = ${variable.value}` : "";
    listItem.textContent = `${variable.name}${value}${description}`;
    envVariablesList.appendChild(listItem);
  });
}

function renderRequiredInputs(requiredInputs) {
  requiredInputsBody.replaceChildren();
  if (!Array.isArray(requiredInputs) || requiredInputs.length === 0) {
    const row = document.createElement("tr");
    row.innerHTML = `
      <td colspan="5">No required inputs detected. Copy <code>.env.example</code> to <code>.env</code> if you want to override defaults later.</td>
    `;
    requiredInputsBody.appendChild(row);
    return;
  }

  requiredInputs.forEach((item) => {
    const row = document.createElement("tr");
    row.innerHTML = `
      <td><code>${escapeHtml(item.name || "")}</code></td>
      <td>${item.required === false ? "Optional" : "Required"}</td>
      <td><code>${escapeHtml(item.example || "") || "-"}</code></td>
      <td>${escapeHtml(item.whereToAdd || ".env")}</td>
      <td>${escapeHtml(item.purpose || "No purpose provided.")}</td>
    `;
    requiredInputsBody.appendChild(row);
  });
}

function renderModules(modules) {
  modulesList.replaceChildren();
  if (!Array.isArray(modules) || modules.length === 0) {
    const empty = document.createElement("p");
    empty.className = "text-block";
    empty.textContent = "No modules available.";
    modulesList.appendChild(empty);
    return;
  }

  modules.forEach((module) => {
    const card = document.createElement("article");
    card.className = "module-card";

    const title = document.createElement("h4");
    title.textContent = module.name || "Unnamed module";

    const purpose = document.createElement("p");
    purpose.textContent = module.purpose || "No purpose provided.";

    const keyFiles = document.createElement("p");
    keyFiles.className = "key-files";
    const files = Array.isArray(module.keyFiles) && module.keyFiles.length
      ? module.keyFiles.join(", ")
      : "No key files provided.";
    keyFiles.textContent = `Key files: ${files}`;

    card.append(title, purpose, keyFiles);
    modulesList.appendChild(card);
  });
}

function renderFiles(files) {
  filesList.replaceChildren();
  if (!Array.isArray(files) || files.length === 0) {
    const empty = document.createElement("p");
    empty.className = "text-block";
    empty.textContent = "No starter files were generated.";
    filesList.appendChild(empty);
    return;
  }

  files.forEach((file) => {
    const entry = document.createElement("details");
    entry.className = "file-entry";

    const summary = document.createElement("summary");
    summary.innerHTML = `
      <span class="file-entry-header">
        <span class="file-entry-dots"><span></span><span></span><span></span></span>
        <span class="file-entry-path">${escapeHtml(file.path || "Unnamed file")}</span>
      </span>
      <span class="file-entry-tag">Source</span>
    `;

    const code = document.createElement("pre");
    code.className = "code-block";
    code.textContent = file.content || "";

    entry.append(summary, code);
    filesList.appendChild(entry);
  });
}

function clearCollection(element) {
  element.replaceChildren();
}

function dedupeList(items) {
  return [...new Set((items || []).filter(Boolean))];
}

function escapeHtml(value) {
  return String(value)
    .replaceAll("&", "&amp;")
    .replaceAll("<", "&lt;")
    .replaceAll(">", "&gt;")
    .replaceAll('"', "&quot;")
    .replaceAll("'", "&#039;");
}