import { Request, Response } from 'express';
import { IDatasetService } from '../services/interfaces/IDatasetService';

export class HealthController {
  private datasetService: IDatasetService;

  constructor(datasetService: IDatasetService) {
    this.datasetService = datasetService;
  }

  public getHealth = async (req: Request, res: Response): Promise<void> => {
    try {
      const stats = await this.datasetService.getDatasetStats();
      const memoryUsage = process.memoryUsage();

      res.status(200).json({
        status: 'healthy',
        timestamp: new Date().toISOString(),
        nodeVersion: process.version,
        uptimeSeconds: Math.floor(process.uptime()),
        memory: {
          rssMb: Math.round(memoryUsage.rss / (1024 * 1024)),
          heapTotalMb: Math.round(memoryUsage.heapTotal / (1024 * 1024)),
          heapUsedMb: Math.round(memoryUsage.heapUsed / (1024 * 1024)),
        },
        storage: {
          csvAvailable: stats.csvExists,
          idxAvailable: stats.idxExists,
          totalIndexedRows: stats.totalIndexedRows,
        },
      });
    } catch (err: any) {
      res.status(500).json({
        status: 'unhealthy',
        error: err.message,
      });
    }
  };
}