import { LoggerService } from '../logger/logger.service.js';
import { LOGGER_MODULE_PROVIDER } from '../logger/logger.constants.js';
import { Inject, Injectable } from '@nestjs/common';
import semver from 'semver';
import chalk from 'chalk';
import { version } from '../version.js';
import { exec, throwIfFailed } from '../util/exec.js';
import confirm from '@inquirer/confirm';

@Injectable()
export class UpdateService {
  constructor(
    @Inject(LOGGER_MODULE_PROVIDER) private readonly logger: LoggerService,
  ) {}

  public async checkForUpdates() {
    const latestVersion = await this.getLatestVersion();

    if (semver.gte(version, latestVersion)) {
      return;
    }

    const answer = await confirm({
      message: `Version ${chalk.red(version)} is outdated. The latest version is ${chalk.green(latestVersion)}. Do you want to update?`,
    });

    if (!answer) {
      return;
    }

    this.logger.debug(
      `Updating from ${chalk.red(version)} to ${chalk.green(latestVersion)}`,
    );

    await exec(`npm install -g @neoskop/migrateus@${latestVersion}`);

    this.logger.info(
      `Update complete. Please restart the application to use the latest version.`,
    );

    process.exit(0);
  }

  private async getLatestVersion() {
    const { stdout } = throwIfFailed(
      await exec('npm view @neoskop/migrateus versions --json', {
        silent: true,
      }),
      (o) => o.stderr,
    );

    const versions = JSON.parse(stdout);
    return semver.sort(versions)[versions.length - 1];
  }
}