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

function renderBodyPreview() {
  const raw = ($("body") && $("body").value) || "";
  const el = $("bodyPreview");
  if (!el) return;
  if (typeof marked !== "undefined" && marked.parse) {
    el.innerHTML = marked.parse(raw, { breaks: true });
  } else {
    el.textContent = raw;
  }
}

const statusEl = $("status");
const rewriteBtn = $("rewriteBtn");
const wechatBtn = $("wechatBtn");
const imBtn = $("imBtn");
const coverUploadBtn = $("coverUploadBtn");

function countText(v) {
  return (v || "").trim().length;
}

function updateCounters() {
  $("sourceCount").textContent = `${countText($("sourceText").value)} 字`;
  $("summaryCount").textContent = `${countText($("summary").value)} 字`;
  $("bodyCount").textContent = `${countText($("body").value)} 字`;
  renderBodyPreview();
}

function setLoading(button, loading, idleText, loadingText) {
  if (!button) return;
  button.disabled = loading;
  button.textContent = loading ? loadingText : idleText;
}

function setStatus(msg, danger = false) {
  statusEl.style.color = danger ? "#b42318" : "#0f5f3d";
  statusEl.textContent = msg;
}

async function postJSON(url, body) {
  const res = await fetch(url, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(body),
  });
  const data = await res.json();
  if (!res.ok) throw new Error(data.detail || "请求失败");
  data._requestId = res.headers.get("X-Request-ID") || "";
  return data;
}

function renderTrace(trace, headerRid) {
  const wrap = $("traceWrap");
  const pre = $("traceJson");
  const badge = $("traceBadge");
  if (!pre || !wrap) return;

  if (!trace || Object.keys(trace).length === 0) {
    pre.textContent = headerRid
      ? JSON.stringify({ request_id: headerRid, note: "响应中无 trace 字段" }, null, 2)
      : "（尚无数据）完成一次「AI 改写」后，这里会显示请求 ID、耗时、质检与降级原因。";
    if (badge) badge.textContent = "";
    return;
  }

  const merged = { ...trace };
  if (headerRid && !merged.request_id) merged.request_id = headerRid;
  pre.textContent = JSON.stringify(merged, null, 2);

  const mode = merged.mode || "";
  if (badge) {
    badge.textContent = mode === "ai" ? "AI" : mode === "fallback" ? "保底" : "";
    badge.className = "trace-badge " + (mode === "ai" ? "is-ai" : mode === "fallback" ? "is-fallback" : "");
  }
  wrap.open = true;
}

$("rewriteBtn").addEventListener("click", async () => {
  const sourceText = $("sourceText").value.trim();
  if (sourceText.length < 20) {
    setStatus("原始内容太短，至少 20 个字符", true);
    return;
  }

  setStatus("AI 改写中...");
  setLoading(rewriteBtn, true, "AI 改写并排版", "AI 改写中...");
  try {
    const data = await postJSON("/api/rewrite", {
      source_text: sourceText,
      title_hint: $("titleHint").value,
      tone: $("tone").value,
      audience: $("audience").value,
      keep_points: $("keepPoints").value,
      avoid_words: $("avoidWords").value,
    });
    $("title").value = data.title || "";
    $("summary").value = data.summary || "";
    $("body").value = data.body_markdown || "";
    updateCounters();
    renderTrace(data.trace, data._requestId);
    const tr = data.trace || {};
    const modelLine = tr.model ? `模型 ${tr.model}` : "";
    if (data.mode === "fallback") {
      const note = (data.quality_notes || [])[0] || "当前为保底改写稿";
      setStatus(
        `改写完成（保底模式，未使用或未通过千问长文）：${note}${modelLine ? ` · ${modelLine}` : ""}`,
        true
      );
    } else if (tr.quality_soft_accept) {
      setStatus(
        `改写完成（AI，质检提示）：${(data.quality_notes || []).join("；") || "见 quality_notes"} · ${modelLine || "AI"}`
      );
      statusEl.style.color = "#9a3412";
    } else {
      setStatus(`改写完成（AI 洗稿）${modelLine ? ` · ${modelLine}` : ""}`);
    }
  } catch (e) {
    setStatus(`改写失败: ${e.message}`, true);
  } finally {
    setLoading(rewriteBtn, false, "AI 改写并排版", "AI 改写中...");
  }
});

$("wechatBtn").addEventListener("click", async () => {
  setStatus("正在发布到公众号草稿箱...");
  setLoading(wechatBtn, true, "发布到公众号草稿箱", "发布中...");
  try {
    const data = await postJSON("/api/publish/wechat", {
      title: $("title").value,
      summary: $("summary").value,
      body_markdown: $("body").value,
      thumb_media_id: $("thumbMediaId") ? $("thumbMediaId").value.trim() : "",
    });
    if (!data.ok) throw new Error(data.detail);
    setStatus("公众号草稿发布成功");
  } catch (e) {
    setStatus(`公众号发布失败: ${e.message}`, true);
  } finally {
    setLoading(wechatBtn, false, "发布到公众号草稿箱", "发布中...");
  }
});

if (coverUploadBtn) {
  coverUploadBtn.addEventListener("click", async () => {
    const fileInput = $("coverFile");
    const hint = $("coverHint");
    const file = fileInput && fileInput.files && fileInput.files[0];
    if (!file) {
      setStatus("请先选择封面图片再上传", true);
      return;
    }
    if (hint) hint.textContent = "正在上传封面...";
    setLoading(coverUploadBtn, true, "上传封面并绑定", "上传中...");
    try {
      const fd = new FormData();
      fd.append("file", file);
      const res = await fetch("/api/wechat/cover/upload", { method: "POST", body: fd });
      const data = await res.json();
      if (!res.ok || !data.ok) throw new Error(data.detail || "封面上传失败");
      const mid = data.data && data.data.thumb_media_id ? data.data.thumb_media_id : "";
      if ($("thumbMediaId")) $("thumbMediaId").value = mid;
      if (hint) hint.textContent = `封面上传成功，已绑定 media_id：${mid}`;
      setStatus("封面上传成功，发布时将优先使用该封面。");
    } catch (e) {
      if (hint) hint.textContent = "封面上传失败，请看状态提示。";
      setStatus(`封面上传失败: ${e.message}`, true);
    } finally {
      setLoading(coverUploadBtn, false, "上传封面并绑定", "上传中...");
    }
  });
}

$("imBtn").addEventListener("click", async () => {
  setStatus("正在发送到 IM...");
  setLoading(imBtn, true, "发送到 IM", "发送中...");
  try {
    const data = await postJSON("/api/publish/im", {
      title: $("title").value,
      body_markdown: $("body").value,
    });
    if (!data.ok) throw new Error(data.detail);
    setStatus("IM 发送成功");
  } catch (e) {
    setStatus(`IM 发送失败: ${e.message}`, true);
  } finally {
    setLoading(imBtn, false, "发送到 IM", "发送中...");
  }
});

["sourceText", "summary", "body"].forEach((id) => {
  $(id).addEventListener("input", updateCounters);
});

async function loadBackendConfig() {
  const el = $("backendConfig");
  if (!el) return;
  try {
    const res = await fetch("/api/config");
    const c = await res.json();
    if (!c.openai_configured) {
      el.textContent =
        "后端未配置 OPENAI_API_KEY：改写将使用本地保底稿，千问不会参与。请在 .env 中配置并重启容器。";
      el.style.color = "#b42318";
      return;
    }
    const name =
      c.provider === "dashscope"
        ? "通义千问（DashScope 兼容接口）"
        : "OpenAI 兼容接口";
    const host = c.base_url_host ? ` · ${c.base_url_host}` : "";
    const to = c.openai_timeout_sec != null ? ` · 单轮最长等待 ${c.openai_timeout_sec}s` : "";
    el.textContent = `已接入：${c.openai_model} · ${name}${host}${to}`;
    el.style.color = "";
  } catch (e) {
    el.textContent = "无法读取 /api/config（请确认服务已启动）";
    el.style.color = "#b42318";
  }
}

loadBackendConfig();
updateCounters();
renderTrace(null, "");