// Get pull-req URL like "https://api.github.com/repos/nwtgck/actions-merge-preview/pulls/4"
const pullReqUrl = context.payload.issue.pull_request.url;
const githubUser = context.payload.repository.owner.login;
const res = await fetch(pullReqUrl, {
  headers: [
    ['Authorization', `Basic ${Buffer.from(`${githubUser}:${githubToken}`).toString('base64')}`]
  ]
});
const resJson = await res.json();
const prUserName = resJson.head.user.login;
const baseBranchName = resJson.base.ref;
const branchName = resJson.head.ref;
const fullRepoName = resJson.head.repo.full_name;
const buildBranch = `actions-build/${prUserName}-${branchName}`;
execSync(`git config --global user.email "github-actions[bot]@users.noreply.github.com"`);
execSync(`git config --global user.name "github-actions[bot]"`);
// (from: https://stackoverflow.com/a/23987039/2885946)
execSync(`git fetch --all`);
console.log(execSync(`git checkout ${baseBranchName}`).toString());
console.log(execSync(`git checkout -b ${buildBranch} ${baseBranchName}`).toString());
console.log(execSync(`git pull https://github.com/${fullRepoName}.git ${branchName}`).toString());
console.log(execSync(`npm ci`).toString());
console.log(execSync(`npm run all`).toString());
if (execSync('git status --porcelain').length === 0) {
  const commentBody = `\
Built file is up to date.
`;
  // Comment the deploy URL
  await postComment(commentBody);
} else {
  console.log(execSync(`git add .; git commit -m 'build'`).toString());
  // Push preview branch
  // NOTE: Force push (should be safe because preview branch always start with "actions-build/")
  execSync(`git push -fu origin ${buildBranch}`);
  const baseRepoFullName = context.payload.repository.full_name;
  // Comment body
  const commentBody = `\
Built branch:  <https://github.com/${baseRepoFullName}/tree/${buildBranch}>  
Compare: https://github.com/${baseRepoFullName}/compare/${resJson.base.ref}...${buildBranch}
`;
  // Comment the deploy URL
  await postComment(commentBody);
}