const { S3Client, PutObjectCommand, DeleteObjectCommand } = require('@aws-sdk/client-s3');
const { v4: uuidv4 } = require('uuid');
const path = require('path');
const fs = require('fs');
const { logger } = require('../middleware/logger');

const exoscaleClient = new S3Client({
  region: process.env.EXOSCALE_REGION,
  endpoint: process.env.EXOSCALE_ENDPOINT,
  credentials: {
    accessKeyId: process.env.EXOSCALE_ACCESS_KEY,
    secretAccessKey: process.env.EXOSCALE_SECRET_KEY,
  },
  forcePathStyle: true,
});

const EXOSCALE_BUCKET = process.env.EXOSCALE_BUCKET;

async function uploadBuffer(buffer, originalName, mimeType, folder = 'user-uploads') {
  logger.info('exoscaleUploader.uploadBuffer:start', { originalName, mimeType, folder });
  try {
    const ext = path.extname(originalName);
    const key = `${folder}/${uuidv4()}${ext}`;

    const command = new PutObjectCommand({
      Bucket: EXOSCALE_BUCKET,
      Key: key,
      Body: buffer,
      ContentType: mimeType,
      ACL: 'private',
    });

    await exoscaleClient.send(command);

    logger.info('exoscaleUploader.uploadBuffer:success', { key, mimeType });
    return {
      objectKey: key,
      url: `${process.env.EXOSCALE_ENDPOINT}/${EXOSCALE_BUCKET}/${key}`,
    };
  } catch (error) {
    logger.error('exoscaleUploader.uploadBuffer:error', { originalName, error: error.message });
    throw error;
  }
}

async function uploadFile(filePath, originalName, mimeType, folder = 'user-uploads') {
  logger.info('exoscaleUploader.uploadFile:start', { filePath, originalName, mimeType, folder });
  try {
    const buffer = fs.readFileSync(filePath);
    const result = await uploadBuffer(buffer, originalName, mimeType, folder);
    logger.info('exoscaleUploader.uploadFile:success', { filePath, key: result.objectKey });
    return result;
  } catch (error) {
    logger.error('exoscaleUploader.uploadFile:error', { filePath, error: error.message });
    throw error;
  }
}

async function deleteObject(objectKey) {
  logger.info('exoscaleUploader.deleteObject:start', { objectKey });
  try {
    const command = new DeleteObjectCommand({
      Bucket: EXOSCALE_BUCKET,
      Key: objectKey,
    });
    await exoscaleClient.send(command);
    logger.info('exoscaleUploader.deleteObject:success', { objectKey });
    return true;
  } catch (error) {
    logger.error('exoscaleUploader.deleteObject:error', { objectKey, error: error.message });
    throw error;
  }
}

module.exports = {
  uploadBuffer,
  uploadFile,
  s3: exoscaleClient, // Export the S3 client
  deleteObject, // Export delete helper
};