// WOV 静态前端公共脚本：所有页面共用的 API 封装、渲染函数与事件绑定。

// Echo 演示节点的预置 manifest，便于管理后台一键填入。
const ECHO_MANIFEST = {
  id: "echo",
  name: "Echo Node",
  version: "0.1.0",
  capability: "echo",
  repo_dir: "wov-node-echo",
  command: ["python", "-m", "wov_node_echo"],
  env: { WOV_NODE_PORT: "0" },
  input_schema: { text: "string" },
  output_schema: { text: "string", file_uri: "file" },
  max_concurrency: 1,
  idle_ttl_seconds: 15,
  health_timeout_seconds: 10,
  keep_warm: false,
};

// 演示“视频字幕生成”工作流的 DAG 定义，预填在工作流编排页。
const DEMO_WORKFLOW = {
  name: "视频字幕生成",
  version: 1,
  nodes: [
    {
      id: "extract",
      node_type: "ffmpeg-extract",
      params: { sample_rate: 16000, channels: 1 },
      inputs: { video_uri: "input.video_uri" },
    },
    {
      id: "asr",
      node_type: "faster-whisper",
      params: { language: "ja" },
      inputs: { audio_uri: "extract.audio_uri" },
    },
    {
      id: "translate",
      node_type: "llm-translate",
      params: { target_language: "zh-CN" },
      inputs: { srt_uri: "asr.srt_uri" },
    },
    {
      id: "ass",
      node_type: "srt-to-dual-eye-ass",
      params: { resolution: "3840x1920" },
      inputs: { cn_srt_uri: "translate.cn_srt_uri" },
    },
  ],
  edges: [
    { from: "extract", to: "asr" },
    { from: "asr", to: "translate" },
    { from: "translate", to: "ass" },
  ],
  entry_inputs: { video_uri: "file" },
  final_outputs: {
    cn_srt: "translate.cn_srt_uri",
    ass: "ass.ass_uri",
  },
};

// 统一封装 fetch：自动携带 JSON 头、解析响应并在失败时抛出可读错误。
async function api(path, options = {}) {
  const response = await fetch(path, {
    headers: { "Content-Type": "application/json", ...(options.headers || {}) },
    ...options,
  });
  const data = await response.json().catch(() => null);
  if (!response.ok) {
    // FastAPI 的校验错误 detail 可能是数组，统一序列化为字符串展示。
    const detail = data && data.detail ? JSON.stringify(data.detail) : response.statusText;
    throw new Error(`${response.status} ${detail}`);
  }
  return data;
}

// 转义用户可控文本，防止 XSS 注入到表格或状态 HTML 中。
function escapeHtml(value) {
  return String(value)
    .replaceAll("&", "&")
    .replaceAll("<", "&lt;")
    .replaceAll(">", "&gt;")
    .replaceAll('"', "&quot;")
    .replaceAll("'", "&#039;");
}

// 根据状态生成带语义颜色的徽章 HTML。
function badge(status) {
  // 统一转小写比较，兼容后端返回的不同大小写。
  const value = String(status).toLowerCase();
  const className =
    value === "ready" || value === "completed" || value === "ok"
      ? "ok"
      : value === "stopped" || value === "error" || value === "failed"
        ? "error"
        : "warn";
  return `<span class="badge ${className}">${escapeHtml(status)}</span>`;
}

// 把 ISO 时间格式化为本地时间；非法值原样返回。
function formatTime(value) {
  if (!value) return "";
  const date = new Date(value);
  return Number.isNaN(date.getTime()) ? value : date.toLocaleString();
}

// 计算距给定时间的流逝时长，用于任务页展示已运行时间。
function formatElapsed(value) {
  if (!value) return "";
  const seconds = Math.floor((Date.now() - new Date(value).getTime()) / 1000);
  if (Number.isNaN(seconds) || seconds < 0) return "";
  if (seconds < 60) return `${seconds} 秒`;
  return `${Math.floor(seconds / 60)} 分钟`;
}

// 健康检查失败时在页面顶部展示后端不可用提示。
async function loadHealth() {
  try {
    await api("/health");
  } catch (error) {
    const banner = document.createElement("div");
    banner.className = "result";
    banner.textContent = `后端不可用：${error.message}`;
    document.body.prepend(banner);
  }
}

// 加载已注册节点并渲染节点表格与调用下拉框。
async function loadNodes() {
  const nodes = await api("/api/admin/nodes");
  const tbody = document.getElementById("nodeList");
  const select = document.getElementById("invokeNodeId");
  tbody.innerHTML = nodes.length
    ? nodes
        .map(
          (node) => `
            <tr>
              <td>${escapeHtml(node.id)}</td>
              <td>${escapeHtml(node.name)}</td>
              <td>${escapeHtml(node.capability)}</td>
              <td>${escapeHtml(node.version)}</td>
              <td><button class="danger" data-delete-node="${escapeHtml(node.id)}">删除</button></td>
            </tr>`,
        )
        .join("")
    : '<tr><td colspan="5">暂无节点</td></tr>';
  select.innerHTML = nodes
    .map((node) => `<option value="${escapeHtml(node.id)}">${escapeHtml(node.name)}</option>`)
    .join("");
}

// 加载节点实例并渲染实例表格。
async function loadInstances() {
  const instances = await api("/api/admin/node-instances");
  const tbody = document.getElementById("instanceList");
  tbody.innerHTML = instances.length
    ? instances
        .map(
          (instance) => `
            <tr>
              <td>${escapeHtml(instance.id)}</td>
              <td>${escapeHtml(instance.node_id)}</td>
              <td>${badge(instance.status)}</td>
              <td>${escapeHtml(instance.pid ?? "")}</td>
              <td>${escapeHtml(instance.address ?? "")}</td>
              <td><button class="danger" data-stop-instance="${escapeHtml(instance.id)}">停止</button></td>
            </tr>`,
        )
        .join("")
    : '<tr><td colspan="6">暂无实例</td></tr>';
}

// 管理后台页面同时刷新节点与实例两个列表。
async function refresh() {
  await Promise.all([loadNodes(), loadInstances()]);
}

// 注册节点：解析文本域中的 manifest JSON 并提交到后端。
async function registerNode() {
  const raw = document.getElementById("manifestJson").value.trim();
  try {
    const manifest = JSON.parse(raw);
    await api("/api/admin/nodes", { method: "POST", body: raw });
    alert("节点注册成功");
    await refresh();
  } catch (error) {
    alert(`注册失败：${error.message}`);
  }
}

// 手动调用节点：读取表单参数并展示返回结果。
async function invokeNode() {
  const nodeId = document.getElementById("invokeNodeId").value;
  const runId = document.getElementById("invokeRunId").value.trim() || "run_web";
  const resultBox = document.getElementById("invokeResult");
  resultBox.textContent = "调用中...";
  try {
    const inputs = JSON.parse(document.getElementById("invokeInputs").value);
    const result = await api(`/api/admin/nodes/${nodeId}/invoke`, {
      method: "POST",
      body: JSON.stringify({ run_id: runId, inputs, params: {} }),
    });
    resultBox.textContent = JSON.stringify(result, null, 2);
    await loadInstances();
  } catch (error) {
    resultBox.textContent = `调用失败：${error.message}`;
  }
}

// 删除节点前不做二次确认，由点击按钮触发。
async function deleteNode(nodeId) {
  try {
    await api(`/api/admin/nodes/${nodeId}`, { method: "DELETE" });
    await refresh();
  } catch (error) {
    alert(`删除失败：${error.message}`);
  }
}

// 请求后端停止指定节点实例。
async function stopInstance(instanceId) {
  try {
    await api(`/api/admin/node-instances/${instanceId}/stop`, { method: "POST" });
    await loadInstances();
  } catch (error) {
    alert(`停止失败：${error.message}`);
  }
}

// 应用中心的 Echo 演示：直接调用 echo 节点并展示结果。
async function runEcho() {
  const text = document.getElementById("echoText").value;
  const resultBox = document.getElementById("echoResult");
  resultBox.textContent = "运行中...";
  try {
    const result = await api("/api/admin/nodes/echo/invoke", {
      method: "POST",
      body: JSON.stringify({
        run_id: `web_${Date.now()}`,
        inputs: { text },
        params: {},
      }),
    });
    resultBox.textContent = JSON.stringify(result, null, 2);
  } catch (error) {
    resultBox.textContent = `运行失败：${error.message}`;
  }
}

// 加载工作流列表并渲染发布状态与操作按钮。
async function loadWorkflows() {
  const workflows = await api("/api/admin/workflows");
  const tbody = document.getElementById("workflowList");
  if (!tbody) return;
  tbody.innerHTML = workflows.length
    ? workflows
        .map(
          (workflow) => `
            <tr>
              <td>${escapeHtml(workflow.id)}</td>
              <td>${escapeHtml(workflow.name)}</td>
              <td>${escapeHtml(workflow.latest_version)}</td>
              <td>${workflow.published ? badge("ok") : badge("draft")}</td>
              <td>
                <button class="danger" data-delete-workflow="${escapeHtml(workflow.id)}">删除</button>
                ${workflow.published ? "" : `<button data-publish-workflow="${escapeHtml(workflow.id)}">发布</button>`}
              </td>
            </tr>`,
        )
        .join("")
    : '<tr><td colspan="5">暂无工作流</td></tr>';
}

// 加载最近任务并渲染任务表格，失败任务提供重试按钮。
async function loadRuns() {
  const tbody = document.getElementById("runList");
  if (!tbody) return;
  const runs = await api("/api/runs");
  tbody.innerHTML = runs.length
    ? runs
        .map((run) => {
          const percent = Math.round((run.progress || 0) * 100);
          const error = run.error || "";
          // RUNNING/QUEUED 附加耗时或排队提示，其余状态只显示徽章。
          const statusHtml =
            run.status === "RUNNING"
              ? `${badge(run.status)} <span class="muted">已运行 ${formatElapsed(run.updated_at)}</span>`
              : run.status === "QUEUED"
                ? `${badge(run.status)} <span class="muted">排队中</span>`
                : badge(run.status);
          const actions =
            run.status === "FAILED"
              ? `<button class="danger" data-retry-run="${escapeHtml(run.id)}">重试</button>`
              : "";
          return `
            <tr>
              <td>${escapeHtml(run.id)}</td>
              <td>${escapeHtml(run.workflow_id)}</td>
              <td>${statusHtml}</td>
              <td>${escapeHtml(run.current_node_id || "-")}</td>
              <td>${percent}%</td>
              <td>${escapeHtml(formatTime(run.created_at))}</td>
              <td title="${escapeHtml(error)}">${error ? escapeHtml(error.slice(0, 60)) : "-"}</td>
              <td>${actions}</td>
            </tr>`;
        })
        .join("")
    : '<tr><td colspan="8">暂无任务</td></tr>';
}

// 请求后端重试失败任务，成功后刷新列表。
async function retryRun(runId) {
  try {
    const result = await api(`/api/runs/${runId}/retry`, { method: "POST" });
    alert(`任务 ${result.id} 已重新排队`);
    await loadRuns();
  } catch (error) {
    alert(`重试失败：${error.message}`);
  }
}

// 创建或更新工作流：解析 DAG JSON 后提交，随后刷新列表。
async function createWorkflow() {
  const workflowId = document.getElementById("workflowId").value.trim();
  const name = document.getElementById("workflowName").value.trim();
  const description = document.getElementById("workflowDescription").value.trim();
  let definition;
  try {
    definition = JSON.parse(document.getElementById("workflowDefinition").value);
  } catch (error) {
    alert(`DAG JSON 无效：${error.message}`);
    return;
  }
  try {
    await api("/api/admin/workflows", {
      method: "POST",
      body: JSON.stringify({
        id: workflowId || undefined,
        name,
        description,
        definition,
      }),
    });
    alert("工作流已保存");
    await loadWorkflows();
  } catch (error) {
    alert(`保存失败：${error.message}`);
  }
}

// 发布指定工作流，使其出现在用户应用中心。
async function publishWorkflow(workflowId) {
  try {
    await api(`/api/admin/workflows/${workflowId}/publish`, { method: "POST" });
    await loadWorkflows();
  } catch (error) {
    alert(`发布失败：${error.message}`);
  }
}

// 删除指定工作流。
async function deleteWorkflow(workflowId) {
  try {
    await api(`/api/admin/workflows/${workflowId}`, { method: "DELETE" });
    await loadWorkflows();
  } catch (error) {
    alert(`删除失败：${error.message}`);
  }
}

// 上传视频并轮询任务进度，完成后渲染下载链接。
async function uploadVideo() {
  const fileInput = document.getElementById("videoFile");
  const progress = document.getElementById("runProgress");
  const downloads = document.getElementById("downloads");
  downloads.innerHTML = "";
  if (!fileInput.files.length) {
    progress.textContent = "请先选择视频文件";
    return;
  }
  const form = new FormData();
  form.append("file", fileInput.files[0]);
  progress.textContent = "上传中...";
  try {
    const response = await fetch("/api/apps/demo/runs", { method: "POST", body: form });
    const data = await response.json().catch(() => null);
    if (!response.ok) {
      throw new Error(data && data.detail ? JSON.stringify(data.detail) : response.statusText);
    }
    await pollRun(data.id, progress, downloads);
  } catch (error) {
    progress.textContent = `运行失败：${error.message}`;
  }
}

// 每秒轮询一次任务状态，最多 3600 次（约 1 小时），超时后提示查看接口。
async function pollRun(runId, progress, downloads) {
  for (let i = 0; i < 3600; i += 1) {
    const run = await api(`/api/runs/${runId}`);
    const percent = Math.round((run.progress || 0) * 100);
    progress.textContent = `状态：${run.status} | 当前节点：${run.current_node_id || "-"} | 进度：${percent}%`;
    if (run.status === "COMPLETED") {
      renderArtifacts(runId, run.artifacts, downloads);
      return;
    }
    if (run.status === "FAILED") {
      progress.textContent = `运行失败：${run.error || "未知错误"}`;
      return;
    }
    await new Promise((resolve) => setTimeout(resolve, 1000));
  }
  progress.textContent = "轮询超时，请到 /api/runs 查看任务状态";
}

// 只展示用户关心的最终产物（中文 SRT 与 ASS）下载入口。
function renderArtifacts(runId, artifacts, container) {
  container.innerHTML = artifacts
    .filter((item) => ["cn_srt", "ass"].includes(item.name))
    .map(
      (item) => `
        <a class="download-link" href="/api/runs/${encodeURIComponent(runId)}/artifacts/${encodeURIComponent(item.name)}">
          下载 ${escapeHtml(item.name)}
        </a>`,
    )
    .join("");
}

// 全局点击委托：按按钮上的 data-* 属性分发到对应操作。
document.addEventListener("click", (event) => {
  const deleteNodeButton = event.target.closest("[data-delete-node]");
  if (deleteNodeButton) {
    deleteNode(deleteNodeButton.dataset.deleteNode);
    return;
  }
  const stopButton = event.target.closest("[data-stop-instance]");
  if (stopButton) {
    stopInstance(stopButton.dataset.stopInstance);
    return;
  }
  const deleteWorkflowButton = event.target.closest("[data-delete-workflow]");
  if (deleteWorkflowButton) {
    deleteWorkflow(deleteWorkflowButton.dataset.deleteWorkflow);
    return;
  }
  const publishWorkflowButton = event.target.closest("[data-publish-workflow]");
  if (publishWorkflowButton) {
    publishWorkflow(publishWorkflowButton.dataset.publishWorkflow);
    return;
  }
  const retryButton = event.target.closest("[data-retry-run]");
  if (retryButton) {
    retryRun(retryButton.dataset.retryRun);
  }
});

// 页面初始化：预填 manifest/DAG、绑定按钮事件并加载对应页面数据。
document.addEventListener("DOMContentLoaded", async () => {
  const manifestBox = document.getElementById("manifestJson");
  if (manifestBox) {
    manifestBox.value = JSON.stringify(ECHO_MANIFEST, null, 2);
  }
  const loadEchoButton = document.getElementById("loadEchoManifest");
  if (loadEchoButton) {
    loadEchoButton.addEventListener("click", () => {
      manifestBox.value = JSON.stringify(ECHO_MANIFEST, null, 2);
    });
  }
  const registerButton = document.getElementById("registerNode");
  if (registerButton) {
    registerButton.addEventListener("click", registerNode);
  }
  const invokeButton = document.getElementById("invokeNode");
  if (invokeButton) {
    invokeButton.addEventListener("click", invokeNode);
  }
  const echoButton = document.getElementById("runEcho");
  if (echoButton) {
    echoButton.addEventListener("click", runEcho);
  }
  const workflowDefinition = document.getElementById("workflowDefinition");
  if (workflowDefinition) {
    workflowDefinition.value = JSON.stringify(DEMO_WORKFLOW, null, 2);
  }
  const createWorkflowButton = document.getElementById("createWorkflow");
  if (createWorkflowButton) {
    createWorkflowButton.addEventListener("click", createWorkflow);
  }
  const publishWorkflowButton = document.getElementById("publishWorkflow");
  if (publishWorkflowButton) {
    publishWorkflowButton.addEventListener("click", () => {
      publishWorkflow(document.getElementById("workflowId").value.trim());
    });
  }
  const uploadButton = document.getElementById("uploadVideo");
  if (uploadButton) {
    uploadButton.addEventListener("click", uploadVideo);
  }

  await loadHealth();
  if (document.getElementById("nodeList")) {
    await refresh();
  }
  if (document.getElementById("workflowList")) {
    await loadWorkflows();
  }
  // 任务管理页每 5 秒自动刷新一次状态。
  if (document.getElementById("runList")) {
    await loadRuns();
    setInterval(loadRuns, 5000);
  }
});