feat: actual logic

src/main.ts

@@ -1,18 +1,43 @@
-import * as core from '@actions/core';
-import {wait} from './wait'
+import * as core from "@actions/core";
+import { context, GitHub } from "@actions/github";
 
 async function run() {
   try {
-    const ms = core.getInput('milliseconds');
-    console.log(`Waiting ${ms} milliseconds ...`)
-
-    core.debug((new Date()).toTimeString())
-    await wait(parseInt(ms, 10));
-    core.debug((new Date()).toTimeString())
-
-    core.setOutput('time', new Date().toTimeString());
-  } catch (error) {
-    core.setFailed(error.message);
+    const repo = context.repo;
+    const issue_number = context?.payload?.pull_request?.number;
+    if (!issue_number) {
+      core.setFailed("This action only works for pull_request");
+      return;
+    }
+    const body = core.getInput("message");
+    const githubToken = core.getInput("GITHUB_TOKEN");
+    if (!body || !githubToken) {
+      core.setFailed("invalid input: please check your workflow");
+      return;
+    }
+    const octokit = new GitHub(githubToken);
+    const { data: comments } = await octokit.issues.listComments({
+      ...repo,
+      issue_number
+    });
+    const myComment = comments.find(
+      comment => comment.user.login === "github-actions[bot]"
+    );
+    if (myComment) {
+      await octokit.issues.updateComment({
+        ...repo,
+        comment_id: myComment.id,
+        body
+      });
+    } else {
+      await octokit.issues.createComment({
+        ...repo,
+        issue_number,
+        body
+      });
+    }
+  } catch ({ message }) {
+    core.setFailed(message);
   }
 }
 

src/wait.ts

@@ -1,10 +0,0 @@
-export function wait(milliseconds: number) {
-    return new Promise((resolve) => {
-        if (isNaN(milliseconds)) { 
-            throw new Error('milleseconds not a number'); 
-        }
-
-        setTimeout(() => resolve("done!"), milliseconds)
-    });
-}
-