function createDebugContentLog({
  previewDebugBody,
  DEBUG_BODY_LIMIT,
  debugState,
  renderDebugPanel
}) {
  function logRequestStart(details) {
    const entry = {
      id: debugState.requestLog.length + 1,
      name: details.name,
      method: details.method,
      url: details.url,
      headers: details.headers,
      status: "pending",
      startedAt: new Date(),
      completedAt: null,
      durationMs: null,
      httpStatus: null,
      statusText: "",
      requestHeaders: details.headers,
      requestBody: details.body || "",
      metadata: details.metadata || {},
      responseHeaders: {},
      responseBody: "",
      responseBodyTruncated: false,
      error: ""
    };

    debugState.requestLog.push(entry);
    renderDebugPanel();
    return entry;
  }

  function logRequestSuccess(entry, response, responseBody) {
    entry.status = response.ok ? "success" : "failed";
    entry.completedAt = new Date();
    entry.durationMs = entry.completedAt.getTime() - entry.startedAt.getTime();
    entry.httpStatus = response.status;
    entry.statusText = response.statusText || "";
    entry.responseHeaders = headersToObject(response.headers);
    entry.responseBody = responseBody.value;
    entry.responseBodyTruncated = responseBody.truncated;
    renderDebugPanel();
  }

  function logRequestFailure(entry, errorMessage) {
    entry.status = "failed";
    entry.completedAt = new Date();
    entry.durationMs = entry.completedAt.getTime() - entry.startedAt.getTime();
    entry.error = errorMessage;
    renderDebugPanel();
  }

  function appendBackgroundRequestLog(entries) {
    if (!Array.isArray(entries) || entries.length === 0) {
      return;
    }

    entries.forEach((entry) => {
      const existing = entry.debugKey && debugState.requestLog.find(item => item.debugKey === entry.debugKey);
      if (existing && existing.status !== "pending" && entry.status === "pending") return;
      const normalized = {
        id: existing ? existing.id : debugState.requestLog.length + 1,
        debugKey: entry.debugKey,
        name: entry.name || "backgroundRequest",
        method: entry.method || "GET",
        url: entry.url || "",
        headers: entry.requestHeaders || {},
        status: entry.status || "failed",
        startedAt: new Date(entry.startedAt),
        completedAt: entry.completedAt ? new Date(entry.completedAt) : null,
        durationMs: entry.durationMs,
        httpStatus: entry.httpStatus,
        statusText: entry.statusText || "",
        requestHeaders: entry.requestHeaders || {},
        requestBody: entry.requestBody || "",
        metadata: entry.metadata || { executionContext: "background" },
        responseHeaders: entry.responseHeaders || {},
        responseBody: entry.responseBody || "",
        responseBodyTruncated: Boolean(entry.responseBodyTruncated),
        error: entry.error || ""
      };
      if (existing) Object.assign(existing, normalized);
      else debugState.requestLog.push(normalized);
    });
    renderDebugPanel();
  }

  async function readResponseBodyForDebug(response) {
    try {
      const text = await response.clone().text();
      return createDebugBody(text);
    } catch (error) {
      return {
        value: `Unable to read response body: ${error.message || "unknown error"}`,
        truncated: false
      };
    }
  }

  function createDebugBody(text) {
    return previewDebugBody(text, DEBUG_BODY_LIMIT);
  }

  function headersToObject(headers) {
    const headerMap = {};

    headers.forEach((value, key) => {
      headerMap[key] = value;
    });

    return headerMap;
  }

  function formatHeaderBlock(headers) {
    const entries = Object.entries(headers);

    if (entries.length === 0) {
      return "(none)";
    }

    return entries
      .map(([key, value]) => `${key}: ${debugState.debugSecretsVisible || !isSensitiveDebugKey(key)
        ? value
        : formatHiddenDebugValue(value)}`)
      .join("\n");
  }

  function formatDebugBody(body) {
    const text = body || "(none)";
    try {
      const normalized = String(text).replace(/^\uFEFF/, "").trimStart()
        .replace(/^\)\]\}',?\s*/, "")
        .replace(/^while\s*\(1\);\s*/, "");
      let value = JSON.parse(normalized);
      // Some services serialize their JSON document inside a JSON string.
      for (let depth = 0; depth < 2 && typeof value === "string" && /^[\s]*[\[{]/.test(value); depth += 1) {
        try { value = JSON.parse(value); } catch { break; }
      }
      return JSON.stringify(debugState.debugSecretsVisible ? value : maskSensitiveDebugValue(value), null, 2);
    } catch (error) {
      return text;
    }
  }

  function maskSensitiveDebugValue(value, parentKey = "") {
    if (Array.isArray(value)) {
      return value.map((item) => maskSensitiveDebugValue(item, parentKey));
    }

    if (!value || typeof value !== "object") {
      return value;
    }

    return Object.fromEntries(Object.entries(value).map(([key, child]) => {
      const isSensitive = isSensitiveDebugKey(key)
        || (key === "value" && /uiaasHeader|uiassHeader/i.test(parentKey));
      return [key, isSensitive
        ? formatHiddenDebugValue(child)
        : maskSensitiveDebugValue(child, key)];
    }));
  }

  function isSensitiveDebugKey(key) {
    return /authorization|cookie|password|secret|(^|[_-])token($|[_-])|token$/i.test(key);
  }

  function formatHiddenDebugValue(value) {
    if (value === null || value === undefined || value === "") {
      return "(missing)";
    }

    return `(present, ${String(value).length} characters)`;
  }

  function formatMetadataBlock(metadata) {
    const entries = Object.entries(metadata);

    if (entries.length === 0) {
      return "(none)";
    }

    return entries
      .map(([key, value]) => `${key}: ${value || "(none)"}`)
      .join("\n");
  }

  function maskToken(token) {
    if (token.length <= 10) {
      return "(present)";
    }

    return `${token.slice(0, 4)}...${token.slice(-4)}`;
  }

  return { logRequestStart, logRequestSuccess, logRequestFailure, appendBackgroundRequestLog, readResponseBodyForDebug, createDebugBody, headersToObject, formatHeaderBlock, formatDebugBody, maskSensitiveDebugValue, isSensitiveDebugKey, formatHiddenDebugValue, formatMetadataBlock, maskToken };
}