const pkg = require("../package.json");
const fs = require("fs");
const childProcess = require("child_process");
const util = require("../src/util");

util.polyfill();

const newVersion = process.env.VERSION;

console.log("New Version: " + newVersion);

if (! newVersion) {
    console.error("invalid version");
    process.exit(1);
}

const exists = tagExists(newVersion);

if (! exists) {

    // Process package.json
    pkg.version = newVersion;

    // Replace the version: https://regex101.com/r/hmj2Bc/1
    pkg.scripts.setup = pkg.scripts.setup.replace(/(git checkout )([^\s]+)/, `$1${newVersion}`);
    fs.writeFileSync("package.json", JSON.stringify(pkg, null, 4) + "\n");

    commit(newVersion);
    tag(newVersion);

} else {
    console.log("version exists");
}

/**
 * Updates the version number in package.json and commits it to git.
 * @param {string} version - The new version number
 *
 * Generated by Trelent
 */
function commit(version) {
    let msg = "Update to " + version;

    let res = childProcess.spawnSync("git", [ "commit", "-m", msg, "-a" ]);
    let stdout = res.stdout.toString().trim();
    console.log(stdout);

    if (stdout.includes("no changes added to commit")) {
        throw new Error("commit error");
    }
}

function tag(version) {
    let res = childProcess.spawnSync("git", [ "tag", version ]);
    console.log(res.stdout.toString().trim());
}

/**
 * Checks if a given version is already tagged in the git repository.
 * @param {string} version - The version to check for.
 *
 * Generated by Trelent
 */
function tagExists(version) {
    if (! version) {
        throw new Error("invalid version");
    }

    let res = childProcess.spawnSync("git", [ "tag", "-l", version ]);

    return res.stdout.toString().trim() === version;
}