const { exec } = require("child_process");

module.exports = async function ({ core, context }, imageRepo) {
  core.summary.addTable([
    [{ data: "PWD", header: true }, process.cwd()],
    [{ data: "GITHUB_REF", header: true }, context.ref],
    [{ data: "GITHUB_SHA", header: true }, context.sha],
    [{ data: "GITHUB_EVENT_NAME", header: true }, context.eventName],
  ]);

  if (!context.ref?.match(/^refs\/tags\/v/)) {
    core.setFailed(`Invalid tag: '${context.ref}'. Has to be like 'v1.22', 'v1.22.33' only.`);
    return;
  }

  // Current version being tagged, including the 'v' prefix.
  const thisVersion = context.ref.replace("refs/tags/", "");
  core.setOutput("tag", thisVersion);

  // The latest version of Appsmith available, including the 'v' prefix, including the currently tagged version.
  const latestVersion = await getLatestTag();

  // The docker tags to be pushed to the registry.
  const dockerTags = [
    `${imageRepo}:${thisVersion}`,
  ];

  if (latestVersion === thisVersion) {
    dockerTags.push(`${imageRepo}:latest`);
  }

  core.summary.addHeading("Docker image tags", 3);
  core.summary.addCodeBlock(dockerTags.join("\n"));
  core.setOutput("docker_tags", dockerTags.join("\n"));

  core.summary.write();
}

function getLatestTag() {
  return new Promise((resolve, reject) => {
    exec("git tag --list --sort=-version:refname 'v*' | head -1", (error, stdout, stderr) => {
      if (error) {
        reject(`exec error: ${error}`);
        return;
      }
      if (stderr) {
        reject(`stderr: ${stderr}`);
        return;
      }
      resolve(stdout.trim());
    });
  });
}