// ============================================================================
// Vision Tool — 在线图片识别（原生单页）
// 进入方式：固定进入密钥（存于数据库，首次启动自动初始化）
// ============================================================================

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

// ---------- 白昼/黑夜主题 ----------
const THEME_KEY = "vt_theme";

function currentTheme() {
  const saved = localStorage.getItem(THEME_KEY);
  if (saved === "dark" || saved === "light") return saved;
  // 未设置时跟随系统偏好
  return window.matchMedia && window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
}

function applyTheme(theme) {
  document.documentElement.dataset.theme = theme;
  localStorage.setItem(THEME_KEY, theme);
  $("themeBtn").textContent = theme === "dark" ? "☀️" : "🌙";
}

applyTheme(currentTheme());
$("themeBtn").addEventListener("click", () => {
  applyTheme(document.documentElement.dataset.theme === "dark" ? "light" : "dark");
});

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

// ---------- 进入密钥 ----------
const KEY_STORAGE = "vt_access_key";

function isUnlocked() {
  return !!localStorage.getItem(KEY_STORAGE);
}

function refreshUnlockState() {
  const unlocked = isUnlocked();
  $("unlockLayer").hidden = unlocked;
  const area = $("accountArea");
  area.innerHTML = "";
  if (!unlocked) return;

  const chip = document.createElement("span");
  chip.className = "user-chip";
  chip.textContent = "🔓 已解锁";
  area.appendChild(chip);

  // 一键复制 API 文档（以当前 URL 为基础地址）
  const docBtn = document.createElement("button");
  docBtn.className = "btn btn-ghost";
  docBtn.textContent = "📋 复制 API 文档";
  docBtn.onclick = async () => {
    try {
      await navigator.clipboard.writeText(buildApiDoc());
      docBtn.textContent = "已复制 ✓";
      setTimeout(() => (docBtn.textContent = "📋 复制 API 文档"), 1500);
    } catch {
      alert("复制失败，请手动复制");
    }
  };
  area.appendChild(docBtn);

  const logout = document.createElement("button");
  logout.className = "btn btn-ghost";
  logout.textContent = "退出";
  logout.onclick = () => {
    localStorage.removeItem(KEY_STORAGE);
    refreshUnlockState();
  };
  area.appendChild(logout);
}

// 生成 API 文档（Markdown，供智能体/开发者直接调用）
function buildApiDoc() {
  const base = window.location.origin;
  const key = localStorage.getItem(KEY_STORAGE) || "19735500";
  return `# Vision Tool — 在线图片识别 API

这是一个在线图片识别服务。
智能体可通过下面的 HTTP API 直接调用，识别图片内容。

## 基础信息

- 服务地址: \`${base}\`
- 进入密钥: \`${key}\`（可选，用于鉴权调用）

## 接口：图片识别

POST \`${base}/api/v1/vision/analyze\`

multipart/form-data 字段：

- \`images\`: 图片文件，可传多个（支持 png/jpg/gif/webp/bmp/tiff）
- \`prompt\`: 可选，自定义分析提问（不传则默认详细描述图片内容）

### 免鉴权调用示例

\`\`\`bash
curl -X POST ${base}/api/v1/vision/analyze \\
  -F "images=@photo.png" \\
  -F "prompt=这张图里有什么？"
\`\`\`

### 带密钥调用示例

\`\`\`bash
curl -X POST ${base}/api/v1/vision/analyze \\
  -H "X-Access-Key: ${key}" \\
  -F "images=@photo.png"
\`\`\`

## 响应格式

\`\`\`json
{
  "code": 0,
  "message": "ok",
  "data": {
    "result": "识别结果文本",
    "images": ["/uploads/xxx.png"],
    "usage": { "prompt_tokens": 0, "completion_tokens": 0, "total_tokens": 0 }
  }
}
\`\`\`

## 其他接口

- GET \`${base}/api/health\` — 健康检查
- POST \`${base}/api/v1/auth/verify\` — 校验进入密钥 \`{"key": "${key}"}\`

## 用法建议

需要识别图片内容时，将图片路径交给智能体，让它执行上述 curl 命令即可。
`;
}

$("unlockBtn").addEventListener("click", unlock);
$("unlockKey").addEventListener("keydown", (e) => { if (e.key === "Enter") unlock(); });

async function unlock() {
  const key = $("unlockKey").value.trim();
  if (!key) {
    $("unlockError").textContent = "请输入进入密钥";
    return;
  }
  try {
    await api("/api/v1/auth/verify", {
      method: "POST",
      body: JSON.stringify({ key }),
    });
    localStorage.setItem(KEY_STORAGE, key);
    $("unlockKey").value = "";
    $("unlockError").textContent = "";
    refreshUnlockState();
  } catch (err) {
    $("unlockError").textContent = err.message;
  }
}

// ---------- 图片选择与预览 ----------
let selectedFiles = [];
let analyzing = false;

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 = "正在识别图片内容，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 ----------
refreshUnlockState();