import crypto from 'crypto';
import fs from 'fs';
// import Config from '@ioc:Adonis/Core/Config';
import logger from '@adonisjs/core/services/logger';
import { BaseCommand } from "@adonisjs/core/ace";
import { CommandOptions } from "@adonisjs/core/types/ace";

export default class ValidateChecksum extends BaseCommand {
    /**
     * Command name is used to run the command
     */
    public static commandName = 'validate:checksum';

    /**
     * Command description is displayed in the "help" output
     */
    public static description = '';
    static options: CommandOptions = {
          loadApp: true,
          staysAlive: false,
        };

    public async run() {
        // this.logger.info('Hello world!')
        const { default: File } = await import('#models/file');
        // const { default: HashValue } = await  (await (import ('App/Models/HashValue')));

        // query all published files from database:
        const files = await File.query()
            .whereHas('dataset', (dQuery) => {
                dQuery.where('server_state', 'published');
            })
            .preload('hashvalues');

        // const logLevel = Config.get('app.logger.level', 'info');
        // console.log(this.logger.)

        for (var file of files) {
            let hashValue = await file.related('hashvalues').query().pluck('value', 'type');

            const filePath = '/storage/app/public/' + file.pathName;
            let calculatedMd5FileHash;
            try {
                calculatedMd5FileHash = await this.checksumFile(filePath, 'md5');
            } catch (exception) {
                // this.logger.error(exception.message);
                logger.error(exception.message);
                continue;
            }

            if (hashValue['md5'] === calculatedMd5FileHash) {
                logger.info(`File id ${file.id} OK: stored md5 checksum: ${calculatedMd5FileHash}, same control md5 checksum: ${hashValue['md5']}`);
            } else {
                logger.error(
                    `File id ${file.id}: stored md5 checksum: ${calculatedMd5FileHash}, control md5 checksum: ${hashValue['md5']}`,
                );
            }
        }
    }

    private async checksumFile(path: string, hashName = 'md5'): Promise<string> {
        return new Promise((resolve, reject) => {
            const hash = crypto.createHash(hashName);
            const stream = fs.createReadStream(path);
            stream.on('error', (err) => reject(err));
            stream.on('data', (chunk) => hash.update(chunk));
            stream.on('end', () => resolve(hash.digest('hex')));
        });
    }
}