package util

import (
	"archive/zip"
	"errors"
	"fmt"
	"github.com/spf13/viper"
	"houston/logger"
	"io"
	"os"
	"path/filepath"
)

func UnzipFile(zipFilePath string, destinationDirectoryPath string) error {
	maxFileSize := viper.GetUint64("MAX_FILE_SIZE") * 1024 * 1024
	zipFile, err := zip.OpenReader(zipFilePath)
	if err != nil {
		return err
	}
	defer func(zipFile *zip.ReadCloser) {
		err := zipFile.Close()
		if err != nil {
			logger.Error(fmt.Sprintf("Error while closing zip file: %v", err))
		}
	}(zipFile)

	if _, err := os.Stat(destinationDirectoryPath); os.IsNotExist(err) {
		return err
	}

	for _, file := range zipFile.File {
		err := CheckFileSizeAndUncompress(file, destinationDirectoryPath, maxFileSize)
		if err != nil {
			logger.Error(fmt.Sprintf("Error while unzipping file: %v", err))
		}
	}

	logger.Info("Unzip completed successfully.")
	return nil
}

func CheckFileSizeAndUncompress(file *zip.File, destinationDirectoryPath string, maxFileSize uint64) error {
	if file.UncompressedSize64 > maxFileSize {
		return errors.New(fmt.Sprintf("File with name %v is too big", file.Name))
	}
	zipFile, err := file.Open()
	if err != nil {
		return err
	}
	defer func(zipFile io.ReadCloser) {
		err := zipFile.Close()
		if err != nil {
			logger.Error(fmt.Sprintf("Error while closing zip file: %v", err))
		}
	}(zipFile)

	destFilePath := filepath.Join(destinationDirectoryPath, file.Name)
	destFile, err := os.Create(destFilePath)
	if err != nil {
		logger.Error(fmt.Sprintf("Error while creating destination file: %v", err))
	}
	defer func(destFile *os.File) {
		err := destFile.Close()
		if err != nil {
			logger.Error(fmt.Sprintf("Error while closing destination file: %v", err))
		}
	}(destFile)

	// Check file size
	if file.UncompressedSize64 > maxFileSize {
		logger.Error(fmt.Sprintf("File with name %v is too big", file.Name))
	}

	_, err = io.Copy(destFile, io.Reader(zipFile))
	if err != nil {
		logger.Error(fmt.Sprintf("Error while copying file: %v", err))
		return err
	}
	return nil
}

func CheckAndCreateDirectory(path string) error {
	if _, err := os.Stat(path); os.IsNotExist(err) {
		err := os.MkdirAll(path, os.ModePerm)
		if err != nil {
			logger.Error(fmt.Sprintf("Error while creating directory :%v", err))
			return err
		}
	}
	return nil
}

func CreateFileWithName(path string, fileName string) (*os.File, error) {
	err := CheckAndCreateDirectory(path)
	if err != nil {
		return nil, err
	}
	file, err := os.Create(filepath.Join(path, fileName))
	if err != nil {
		return nil, err
	}
	return file, nil
}

func DeleteFile(path string) error {
	err := os.Remove(path)
	if err != nil {
		logger.Error(fmt.Sprintf("Error while deleting file :%v", err))
		return err
	}
	return nil
}

func CloseFile(file *os.File) {
	err := file.Close()
	if err != nil {
		logger.Error(fmt.Sprintf("Error while closing file: %v", err))
	}
}

func WriteToFile(fileLocation string, fileName string, contentReader io.ReadCloser) error {
	file, err := os.Create(fileLocation + "/" + fileName)
	if err != nil {
		logger.Error(fmt.Sprintf("Error creating file with name %v : %v", fileName, err))
		return err
	}
	_, err = io.Copy(file, contentReader)
	if err != nil {
		logger.Error(fmt.Sprintf("Error copying file with name %v : %v", fileName, err))
		return err
	}
	return nil
}

func DeleteDirectory(directoryPath string) {
	err := os.RemoveAll(directoryPath)
	if err != nil {
		logger.Error(fmt.Sprintf("Error while deleting directory: %v", err))
	}
}

func FetchFilesInDirectory(directoryPath string) ([]os.DirEntry, error) {
	files, err := os.ReadDir(directoryPath)
	if err != nil {
		return nil, err
	}
	return files, nil
}

func GetFile(directoryPath string, fileName string) (*os.File, error) {
	fullPath := filepath.Join(directoryPath, fileName)
	file, err := os.Open(fullPath)
	if err != nil {
		return nil, err
	}
	return file, nil
}