package net.gepafin.tendermanagement.service.impl;

import com.amazonaws.AmazonServiceException;
import com.amazonaws.SdkClientException;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.*;

import net.gepafin.tendermanagement.config.Translator;
import net.gepafin.tendermanagement.constants.GepafinConstant;
import net.gepafin.tendermanagement.dao.S3PathConfig;
import net.gepafin.tendermanagement.entities.DocumentEntity;
import net.gepafin.tendermanagement.entities.UserCompanyDelegationEntity;
import net.gepafin.tendermanagement.enums.DocOtherSourceTypeEnum;
import net.gepafin.tendermanagement.model.response.UploadFileOnAmazonS3Response;
import net.gepafin.tendermanagement.service.AmazonS3Service;
import net.gepafin.tendermanagement.util.Utils;
import net.gepafin.tendermanagement.web.rest.api.errors.CustomValidationException;
import net.gepafin.tendermanagement.web.rest.api.errors.Status;

import org.apache.commons.io.FilenameUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLDecoder;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;


@Service
public class AmazonS3ServiceImpl implements AmazonS3Service {
	
	private final Logger log = LoggerFactory.getLogger(AmazonS3ServiceImpl.class);

    @Autowired
    private AmazonS3 amazonS3;

    @Autowired
    private Environment environment;

    @Value("${aws.s3.bucket.name}")
    private String bucketName;

    @Value("${aws.s3.url}")
    private String s3Url;

    @Autowired
    private S3PathConfig s3ConfigBean;

    @Autowired
    private AmazonS3Client s3Client;

    @Value("${aws.s3.region}")
    private String region;

    @Autowired
    S3ReUploadMigrationService s3ReUploadMigrationService;


    private String upload(String fileName, String s3Folder,
            MultipartFile file) throws IOException {

        String path = s3Folder +"/"+fileName;

        InputStream inputStream = file.getInputStream();

        ObjectMetadata objectMetadata = new ObjectMetadata();
        Map<String, String> metadata = new HashMap<>();
        metadata.put("Content-Type", file.getContentType());
        metadata.put("Content-Length", String.valueOf(file.getSize()));

        Optional<Map<String, String>> optionalMetaData = Optional.of(metadata);
        optionalMetaData.ifPresent(map -> {
            if (!map.isEmpty()) {
                map.forEach(objectMetadata::addUserMetadata);
            }
        });

        if(Boolean.FALSE.equals(isTestProfileActivated())) {
            amazonS3.putObject(bucketName, path, inputStream, objectMetadata);
        }
        //getting actual encoded s3 file path
        URL amazonS3Url = amazonS3.getUrl(bucketName, path);
        String fileUrl = amazonS3Url.toString();
        log.info("File '{}' uploaded successfully to Amazon S3 with URL: {}", fileName, fileUrl);
        return fileUrl;
    }

    @Override
    public Boolean delete(String s3Folder, String filePath) {
    	
    	String fileName = Utils.extractFileName(filePath);
    	String path = s3Folder +"/"+fileName;
        final DeleteObjectRequest deleteObjectRequest = new DeleteObjectRequest(bucketName, path);
        if(Boolean.FALSE.equals(isTestProfileActivated())) {
            amazonS3.deleteObject(deleteObjectRequest);
        }
        log.info("File '{}' deleted successfully from Amazon S3", fileName);
        return true;
        
    }

    public Boolean isTestProfileActivated() {
        String[] activeProfiles = environment.getActiveProfiles();
        return Arrays.stream(activeProfiles).anyMatch("test"::equals);
    }

    @Override
    public InputStream getFile(String s3Folder, String filePath) {
        try {
        	String fileName = Utils.extractFileName(filePath);
        	 // Decode the file name to handle special characters like '+' correctly
            String decodedFileName = URLDecoder.decode(fileName, StandardCharsets.UTF_8.toString());

            String path = s3Folder + "/" + decodedFileName;
            GetObjectRequest getObjectRequest = new GetObjectRequest(bucketName, path);
            S3Object s3Object = amazonS3.getObject(getObjectRequest);
            log.info("File fetched successfully from Amazon S3: {}", fileName);
            return s3Object.getObjectContent();
        } catch (Exception e) {
        	log.error("Error occurred while getting file from Amazon S3: {}", e);
            throw new CustomValidationException(Status.VALIDATION_ERROR,
                    Translator.toLocale(GepafinConstant.GET_ERROR_S3));
        }
    }
    
    @Override
	public UploadFileOnAmazonS3Response uploadFileOnAmazonS3(String s3Folder, MultipartFile file) {
		String extension = FilenameUtils.getExtension(file.getOriginalFilename());
		String originalFileName = org.springframework.util.StringUtils.cleanPath(file.getOriginalFilename());
		String firstNameContain = originalFileName.substring(0, originalFileName.lastIndexOf('.'));
		firstNameContain = Utils.replaceSpacesWithUnderscores(firstNameContain);
		firstNameContain += "_" + Utils.randomKey(7);
		String fileName = (firstNameContain + "." + extension);
		try {
			String filepath = upload(fileName, s3Folder, file);
			return UploadFileOnAmazonS3Response.builder().fileName(originalFileName).filePath(filepath).build();
		} catch (Exception e) {
			log.error("Error occurred while uploading file from Amazon S3: {}", e);
			throw new CustomValidationException(Status.VALIDATION_ERROR,
                    Translator.toLocale(GepafinConstant.UPLOAD_ERROR_S3));
		}
	}

    public String decodeS3Key(String key) {
        return URLDecoder.decode(key, StandardCharsets.UTF_8);
    }

    @Override
    public UploadFileOnAmazonS3Response moveFile(String fileName, String oldPath, String newPath) {
        try {
            log.info("Moving file from {} to {} in bucket {}", oldPath, newPath, bucketName);

            UploadFileOnAmazonS3Response response = copyFile(fileName, oldPath, newPath);

            s3Client.deleteObject(bucketName, decodeS3Key(cleanOldPath(oldPath)));
            log.info("Original file deleted successfully: {}", oldPath);

            return response;
        } catch (AmazonServiceException e) {
            log.error("AWS service error while moving file: {}", e.getErrorMessage(), e);
            throw e;
        } catch (SdkClientException e) {
            log.error("SDK client error while moving file: {}", e.getMessage(), e);
            throw e;
        } catch (Exception e) {
            log.error("Unexpected error while moving file: {}", e.getMessage(), e);
            throw e;
        }
    }

    public String cleanNewPath(String oldPath, String newPath) {
        return  newPath + "/" + oldPath.substring(oldPath.lastIndexOf("/") + 1);
    }

    public String cleanOldPath(String oldPath) {
        return oldPath.replace(s3Url, "");
    }

    @Override
    public UploadFileOnAmazonS3Response copyFile(String fileName, String oldS3Path, String newS3Path){
       try {
           log.info("Copying file from {} to {} in bucket {}", oldS3Path, newS3Path, bucketName);

           oldS3Path = decodeS3Key(cleanOldPath(oldS3Path));
           newS3Path = cleanNewPath(oldS3Path, newS3Path);
           log.info("Copying file from {} to {} in bucket {}", oldS3Path, newS3Path, bucketName);

           CopyObjectRequest copyRequest = new CopyObjectRequest(bucketName, oldS3Path, bucketName, newS3Path);
           s3Client.copyObject(copyRequest);
           log.info("File copied successfully from {} to {}", oldS3Path, newS3Path);

           URL amazonS3Url = amazonS3.getUrl(bucketName, newS3Path);
           String fileUrl = amazonS3Url.toString();
           return UploadFileOnAmazonS3Response.builder().fileName(fileName).filePath(fileUrl).build();
       }
       catch (AmazonServiceException e) {
           log.error("AWS service error while copying file: {}", e.getErrorMessage(), e);
           throw e;
       } catch (SdkClientException e) {
           log.error("SDK client error while copying file: {}", e.getMessage(), e);
           throw e;
       } catch (Exception e) {
           log.error("Unexpected error while copying file: {}", e.getMessage(), e);
           throw e;
       }

    }
}