#!/usr/bin/env node
// Upserts a sticky PR comment on Gitea identified by the marker
// `<!-- bundle-budget-report -->`. Reads bundle-comment.md from the
// workflow's cwd and updates an existing comment if found, otherwise
// creates a new one.
//
// Environment:
//   GITEA_TOKEN  required. PAT with repository write scope.
//   GITEA_HOST   default: git.tool-ctrl.de
//   REPO         "owner/repo" (provided by Gitea workflow context).
//   PR_NUMBER    PR number to post on.
//   COMMENT_PATH optional, default: bundle-comment.md

import fs from "node:fs";

const MARKER = "<!-- bundle-budget-report -->";

async function main() {
  const token = process.env.GITEA_TOKEN;
  const host = process.env.GITEA_HOST || "git.tool-ctrl.de";
  const repo = process.env.REPO;
  const prNumber = process.env.PR_NUMBER;
  const commentPath = process.env.COMMENT_PATH || "bundle-comment.md";

  if (!token || !repo || !prNumber) {
    console.error("post-bundle-budget-gitea-comment: missing GITEA_TOKEN / REPO / PR_NUMBER env vars");
    process.exit(0); // soft-skip: workflow stays green
  }
  if (!fs.existsSync(commentPath)) {
    console.error(`post-bundle-budget-gitea-comment: ${commentPath} not found, skipping`);
    process.exit(0);
  }

  const body = fs.readFileSync(commentPath, "utf8");
  const apiBase = `https://${host}/api/v1/repos/${repo}/issues/${prNumber}/comments`;
  const headers = {
    Authorization: `token ${token}`,
    "Content-Type": "application/json",
    Accept: "application/json",
  };

  // 1) list comments, find existing by marker
  const listRes = await fetch(apiBase, { headers });
  if (!listRes.ok) {
    console.error(`Gitea list-comments failed: ${listRes.status}`);
    process.exit(0);
  }
  const comments = await listRes.json();
  const existing = Array.isArray(comments) ? comments.find((c) => typeof c.body === "string" && c.body.includes(MARKER)) : null;

  if (existing) {
    const updateUrl = `https://${host}/api/v1/repos/${repo}/issues/comments/${existing.id}`;
    const res = await fetch(updateUrl, {
      method: "PATCH",
      headers,
      body: JSON.stringify({ body }),
    });
    if (!res.ok) {
      console.error(`Gitea update-comment failed: ${res.status}`);
      process.exit(0);
    }
    console.log(`Updated bundle-budget comment #${existing.id}`);
  } else {
    const res = await fetch(apiBase, {
      method: "POST",
      headers,
      body: JSON.stringify({ body }),
    });
    if (!res.ok) {
      console.error(`Gitea create-comment failed: ${res.status}`);
      process.exit(0);
    }
    const created = await res.json();
    console.log(`Created bundle-budget comment #${created.id}`);
  }
}

main().catch((err) => {
  console.error(err);
  // Soft-fail: PR comment is informational, never fail the workflow on transient API errors.
  process.exit(0);
});