// ============================================================================
// Vision Tool — 在线免费图片识别（原生单页）
// ============================================================================

const $ = (id) => document.getElementById(id);

// ---------- API 封装 ----------
async function api(path, options = {}) {
  const headers = options.headers || {};
  if (!(options.body instanceof FormData)) {
    headers["Content-Type"] = "application/json";
  }
  const token = localStorage.getItem("vt_token");
  if (token) headers["Authorization"] = `Bearer ${token}`;

  const resp = await fetch(path, { ...options, headers });
  let data;
  try {
    data = await resp.json();
  } catch {
    throw new Error(`HTTP ${resp.status}: 响应解析失败`);
  }
  if (data.code !== 0) throw new Error(data.message || `HTTP ${resp.status}`);
  return data.data;
}

// ---------- 状态 ----------
let selectedFiles = [];   // 待识别的图片文件
let analyzing = false;

// ---------- 顶栏账号区 ----------
async function refreshAccount() {
  const area = $("accountArea");
  area.innerHTML = "";

  const { initialized } = await api("/api/v1/admin/check");

  if (!initialized) {
    const btn = document.createElement("button");
    btn.className = "btn btn-primary";
    btn.textContent = "初始化管理员";
    btn.onclick = () => showModal("initModal");
    area.appendChild(btn);
    return;
  }

  const token = localStorage.getItem("vt_token");
  if (!token) {
    const btn = document.createElement("button");
    btn.className = "btn btn-ghost";
    btn.textContent = "登录";
    btn.onclick = () => showModal("loginModal");
    area.appendChild(btn);
    return;
  }

  // 校验 token 有效性
  try {
    const user = await api("/api/v1/user/profile");
    const chip = document.createElement("span");
    chip.className = "user-chip";
    chip.textContent = `👤 ${user.username}`;
    area.appendChild(chip);
    const logout = document.createElement("button");
    logout.className = "btn btn-ghost";
    logout.textContent = "退出";
    logout.onclick = () => {
      localStorage.removeItem("vt_token");
      refreshAccount();
    };
    area.appendChild(logout);
  } catch {
    localStorage.removeItem("vt_token");
    refreshAccount();
  }
}

// ---------- 模态框 ----------
function showModal(id) {
  $(id).hidden = false;
  $("initError").textContent = "";
  $("loginError").textContent = "";
}
function hideModal(id) { $(id).hidden = true; }
$("initModal").addEventListener("click", (e) => { if (e.target === e.currentTarget) hideModal("initModal"); });
$("loginModal").addEventListener("click", (e) => { if (e.target === e.currentTarget) hideModal("loginModal"); });

// 初始化管理员
$("initBtn").addEventListener("click", async () => {
  const username = $("initUsername").value.trim();
  const password = $("initPassword").value;
  const password2 = $("initPassword2").value;
  if (!username || password.length < 6) {
    $("initError").textContent = "用户名不能为空，密码至少 6 位";
    return;
  }
  if (password !== password2) {
    $("initError").textContent = "两次输入的密码不一致";
    return;
  }
  try {
    await api("/api/v1/admin/init", {
      method: "POST",
      body: JSON.stringify({ username, password }),
    });
    hideModal("initModal");
    await login(username, password);
    refreshAccount();
  } catch (err) {
    $("initError").textContent = err.message;
  }
});

// 登录
$("loginBtn").addEventListener("click", async () => {
  const username = $("loginUsername").value.trim();
  const password = $("loginPassword").value;
  if (!username || !password) {
    $("loginError").textContent = "请输入用户名和密码";
    return;
  }
  try {
    await login(username, password);
    hideModal("loginModal");
    refreshAccount();
  } catch (err) {
    $("loginError").textContent = err.message;
  }
});

async function login(username, password) {
  const data = await api("/api/v1/auth/login", {
    method: "POST",
    body: JSON.stringify({ username, password }),
  });
  localStorage.setItem("vt_token", data.token);
}

// ---------- 图片选择与预览 ----------
const dropzone = $("dropzone");
const fileInput = $("fileInput");

dropzone.addEventListener("click", () => fileInput.click());
dropzone.addEventListener("dragover", (e) => { e.preventDefault(); dropzone.classList.add("dragover"); });
dropzone.addEventListener("dragleave", () => dropzone.classList.remove("dragover"));
dropzone.addEventListener("drop", (e) => {
  e.preventDefault();
  dropzone.classList.remove("dragover");
  addFiles(e.dataTransfer.files);
});
fileInput.addEventListener("change", () => { addFiles(fileInput.files); fileInput.value = ""; });

function addFiles(files) {
  for (const f of files) {
    if (!f.type.startsWith("image/")) continue;
    if (f.size > 10 * 1024 * 1024) { alert(`图片过大（>10MB）: ${f.name}`); continue; }
    selectedFiles.push(f);
  }
  renderPreviews();
}

function renderPreviews() {
  const list = $("previewList");
  list.innerHTML = "";
  selectedFiles.forEach((f, i) => {
    const item = document.createElement("div");
    item.className = "preview-item";
    const img = document.createElement("img");
    img.src = URL.createObjectURL(f);
    img.alt = f.name;
    const rm = document.createElement("button");
    rm.className = "remove";
    rm.textContent = "×";
    rm.onclick = () => {
      selectedFiles.splice(i, 1);
      renderPreviews();
    };
    item.append(img, rm);
    list.appendChild(item);
  });
  $("analyzeBtn").disabled = selectedFiles.length === 0 || analyzing;
}

// ---------- 识别 ----------
$("analyzeBtn").addEventListener("click", analyze);

async function analyze() {
  if (analyzing || selectedFiles.length === 0) return;
  analyzing = true;
  renderPreviews();

  const btn = $("analyzeBtn");
  btn.innerHTML = '<span class="loading"><span class="spinner"></span>识别中…</span>';
  const resultCard = $("resultCard");
  resultCard.hidden = false;
  $("resultBody").textContent = "正在调用免费视觉模型，请稍候（最长约 2 分钟）…";
  $("resultMeta").textContent = "";

  const fd = new FormData();
  selectedFiles.forEach((f) => fd.append("images", f, f.name));
  const prompt = $("promptInput").value.trim();
  if (prompt) fd.append("prompt", prompt);

  try {
    const data = await api("/api/v1/vision/analyze", { method: "POST", body: fd });
    $("resultBody").textContent = data.result;
    if (data.usage) {
      $("resultMeta").textContent =
        `token 用量: prompt ${data.usage.prompt_tokens} / completion ${data.usage.completion_tokens} / total ${data.usage.total_tokens}`;
    }
  } catch (err) {
    $("resultBody").textContent = "❌ 识别失败: " + err.message;
  } finally {
    analyzing = false;
    btn.textContent = "开始识别";
    renderPreviews();
  }
}

// 复制结果
$("copyBtn").addEventListener("click", async () => {
  const text = $("resultBody").textContent;
  try {
    await navigator.clipboard.writeText(text);
    $("copyBtn").textContent = "已复制 ✓";
    setTimeout(() => ($("copyBtn").textContent = "复制"), 1500);
  } catch {
    alert("复制失败，请手动选择文本");
  }
});

// ---------- 启动 ----------
refreshAccount().catch((err) => {
  // check 失败（服务未启动等），提示
  document.querySelector(".brand p").textContent = "⚠️ 服务连接失败: " + err.message;
});