From 463d9273e29cd3399c79cff072b1f3ed91ec35df Mon Sep 17 00:00:00 2001
From: as6325400 <as6325400@gmail.com>
Date: Fri, 4 Apr 2025 00:02:35 +0800
Subject: [PATCH] add batch insert event to calendar

---
 src/js/popup.js | 33 +++++++++++++-----
 src/js/utils.js | 93 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 117 insertions(+), 9 deletions(-)

diff --git a/src/js/popup.js b/src/js/popup.js
index 6b0334d..3d2bf8c 100644
--- a/src/js/popup.js
+++ b/src/js/popup.js
@@ -1,4 +1,9 @@
-import { getCurrentYearMonth, downloadICS, addOneEventToCalendar } from "./utils.js";
+import {
+  getCurrentYearMonth,
+  downloadICS,
+  addOneEventToCalendar,
+  addBatchEventsToCalendar,
+} from "./utils.js";
 
 function initializeInputs() {
   const { year, month } = getCurrentYearMonth();
@@ -112,18 +117,28 @@ function setupEventListeners() {
 async function insertEventsToGCal(events) {
   // Google OAuth token
   const token = await getGoogleAuthToken();
-
-  // add event Google Calendar
-  for (const event of events) {
+  const batchAddEvents = true;
+
+  if (!batchAddEvents) {
+    // add event Google Calendar
+    for (const event of events) {
+      try {
+        await addOneEventToCalendar(token, event);
+        console.log("add Event Success", event.title);
+      } catch (err) {
+        console.error("add Event error：", event.title, err);
+      }
+    }
+  } else if (batchAddEvents) {
+    // batch API，done after...
     try {
-      await addOneEventToCalendar(token, event);
-      console.log("add Event Success", event.title);
+      const batchResponse = await addBatchEventsToCalendar(token, events);
+      console.log("Batch request sent!");
+      console.log(batchResponse);
     } catch (err) {
-      console.error("add Event error：", event.title, err);
+      console.error("Batch request failed:", err);
     }
   }
-
-  // batch API，done after...
 }
 
 async function launchWebAuthFlowForGoogle() {
diff --git a/src/js/utils.js b/src/js/utils.js
index 26b1b8f..31e0695 100644
--- a/src/js/utils.js
+++ b/src/js/utils.js
@@ -73,3 +73,96 @@ export async function addOneEventToCalendar(token, event) {
 
   return res.json();
 }
+
+function normalizeBatchText(raw) {
+  return raw.replace(/\r?\n/g, "\r\n");
+}
+
+function generateBatchRequestBody(events, boundary = "batch_boundary") {
+  const CRLF = "\r\n";
+  let body = "";
+
+  events.forEach((event, i) => {
+    body += `--${boundary}${CRLF}`;
+    body += `Content-Type: application/http${CRLF}`;
+    body += `Content-ID: <item-${i + 1}>${CRLF}${CRLF}`;
+
+    body += `POST /calendar/v3/calendars/primary/events HTTP/1.1${CRLF}`;
+    body += `Content-Type: application/json${CRLF}${CRLF}`;
+
+    const eventPayload = {
+      summary: event.title,
+      description: event.description,
+      start: {
+        dateTime: event.startDate.toISOString(),
+        timeZone: "Asia/Taipei",
+      },
+      end: {
+        dateTime: event.endDate.toISOString(),
+        timeZone: "Asia/Taipei",
+      },
+    };
+
+    body += JSON.stringify(eventPayload) + CRLF + CRLF;
+  });
+
+  body += `--${boundary}--${CRLF}`;
+  return body;
+}
+
+function parseGoogleBatchResponse(responseText) {
+  const boundary = responseText.match(/--batch_[^\r\n-]+/)?.[0]?.slice(2);
+  const parts = responseText.split(`--${boundary}`);
+  const results = [];
+
+  for (const part of parts) {
+    const trimmed = part.trim();
+    if (!trimmed || !trimmed.includes("HTTP/1.1")) continue;
+
+    const statusMatch = trimmed.match(/HTTP\/1.1 (\d{3}) (.+)/);
+    const status = statusMatch ? parseInt(statusMatch[1], 10) : null;
+    const statusText = statusMatch ? statusMatch[2] : "";
+
+    const sections = trimmed.split(/\n{2,}|\r\n{2,}/);
+    const rawBody = sections[sections.length - 1];
+
+    const jsonStart = rawBody.indexOf("{");
+    const jsonEnd = rawBody.lastIndexOf("}");
+
+    let body = null;
+    if (jsonStart !== -1 && jsonEnd !== -1 && jsonEnd > jsonStart) {
+      const jsonStr = rawBody.slice(jsonStart, jsonEnd + 1);
+      try {
+        body = JSON.parse(jsonStr);
+      } catch (e) {
+        console.warn("JSON parse failed:", e);
+      }
+    }
+
+    results.push({ status, ok: status >= 200 && status < 300, statusText, body });
+  }
+
+  return results;
+}
+
+// Google Calendar API batch add Event
+export async function addBatchEventsToCalendar(token, events) {
+  const boundary = "batch_boundary_" + Date.now();
+  const body = generateBatchRequestBody(events, boundary);
+
+  const res = await fetch("https://www.googleapis.com/batch/calendar/v3", {
+    method: "POST",
+    headers: {
+      Authorization: `Bearer ${token}`,
+      "Content-Type": `multipart/mixed; boundary=${boundary}`,
+    },
+    body,
+  });
+
+  const text = await res.text();
+  if (!res.ok) {
+    throw new Error(`Batch API Error: ${res.status}\n${text}`);
+  }
+
+  return parseGoogleBatchResponse(normalizeBatchText(text));
+}