const [owner, repo, title, body = "", head, base = "main"] = process.argv.slice(2);

const token = process.env.GITHUB_TOKEN || "PLACEHOLDER_TOKEN";

async function createPR() {
  const url = `https://api.github.com/repos/${owner}/${repo}/pulls`;
  
  const payload = { title, body, head, base };

  console.log(`Creating PR in ${owner}/${repo}: "${title}" (${head} → ${base})`);

  const response = await fetch(url, {
    method: "POST",
    headers: {
      Authorization: `Bearer ${token}`,
      Accept: "application/vnd.github+json",
      "X-GitHub-Api-Version": "2022-11-28",
      "Content-Type": "application/json",
    },
    body: JSON.stringify(payload),
  });

  if (!response.ok) {
    const error = await response.json();
    console.error("ERROR: GitHub API request failed.");
    console.error(`  Status: ${response.status}`);
    console.error(`  Message: ${error.message || response.statusText}`);
    console.error("  Check that the repository exists and you have push access.");
    process.exit(1);
  }

  const remaining = response.headers.get("X-RateLimit-Remaining");
  if (remaining && parseInt(remaining) < 100) {
    console.log(`⚠️ Rate limit warning: ${remaining} requests remaining`);
  }

  const pr = await response.json();

  const fs = await import("fs");
  fs.writeFileSync("session/pr.json", JSON.stringify(pr, null, 2));

  console.log(`✅ Created PR #${pr.number}: ${pr.title}`);
  console.log(`   URL: ${pr.html_url}`);
  console.log(`   Branch: ${pr.head.ref} → ${pr.base.ref}`);
  console.log(`   Wrote details to session/pr.json`);
}

try {
  await createPR();
} catch (error) {
  console.error("ERROR: Unexpected failure creating pull request.");
  console.error(`  ${error.message}`);
  process.exit(1);
}