#!/usr/bin/env node

import fs from 'node:fs';
import path from 'node:path';
import semver from 'semver';
import { Command, Option } from 'commander';

function bump(fileName, version, releaseType = 'patch') {
    const filePath = path.resolve(process.cwd(), fileName);

    if (!fs.existsSync(filePath)) {
        throw new Error(`File not found: ${filePath}`);
    }

    const json = JSON.parse(fs.readFileSync(filePath, 'utf8'));
    const currentVersion = json.version;

    if (typeof currentVersion !== 'string') {
        throw new Error(`${fileName} does not contain a string "version" field.`);
    }

    const nextVersion = version ?? semver.inc(currentVersion, releaseType);

    if (!nextVersion) {
        throw new Error(`Unsupported semver format: "${currentVersion}"`);
    }

    json.version = nextVersion;

    fs.writeFileSync(filePath, `${JSON.stringify(json, null, 4)}\n`, 'utf8');
    console.log(`Bumped version in ${fileName} to ${nextVersion}`);
    return nextVersion;
}

const program = new Command();
program
    .name('bump-patch')
    .description('Bump the version in package.json')
    .addOption(new Option('-r, --release-type <type>', 'Release type (major, minor, patch)', 'patch')
        .choices('release-type', ['major', 'minor', 'patch'])
    )
    .parse(process.argv);

bump('package.json', undefined, program.opts().releaseType);