import { log } from './logger.js'
import { Readable } from 'node:stream'
import { createWriteStream } from 'node:fs'
import { finished } from 'node:stream/promises'

import { getLatestPackageName, getRequestStream } from './sources/gitea.js'
import { processPisStream } from './process.js'

async function main() {
    try {
        const packageInfo = await getLatestPackageName();
        log('INFO', `Latest PIS Package: ${packageInfo.name}`);

        if (!packageInfo.assets[0]?.browser_download_url) {
            log('ERROR', `No attachments found for release ${packageInfo.name}`);
            process.exit(9);
        }

        const inputStream: Readable = await getRequestStream(packageInfo.assets[0].browser_download_url);

        const outputPath = './review_output.ndjson';
        log('DEBUG', `Processing stream to: ${outputPath}`);

        await writeToTemporaryFile(processPisStream(inputStream), outputPath);
        log('DEBUG', 'Done');
    } catch (err) {
        log('ERROR', 'Fatal error in pipeline: ', err);
        process.exit(7);
    }
}

async function writeToTemporaryFile(generator: AsyncGenerator<any>, path: string) {
    const writer = createWriteStream(path);
    for await (const record of generator) {
        const line = JSON.stringify(record) + '\n';

        if (!writer.write(line)) {
            await new Promise((resolve) => writer.once('drain', resolve));
        }
    }

    writer.end();
    return finished(writer);
}

main();