package utils

import (
	"bufio"
	"os"
)

// ReceiveFile Permet de récupérer un fichier sur un reader
func ReceiveFile(path string, fileSize int, reader *bufio.Reader) bool {
	file, fileErr := os.Create(path)
	if fileErr != nil {
		return false
	}

	defer file.Close()

	// Params
	buffer := make([]byte, 1024)
	currentSize := 0

	b, done := copyFile(currentSize, fileSize, reader, buffer, file)
	if done {
		return b
	}
	return true
}

func copyFile(currentSize int, fileSize int, reader *bufio.Reader, buffer []byte, file *os.File) (bool, bool) {
	// Retrieving file
	for currentSize < fileSize {
		length, err := reader.Read(buffer)
		if err != nil {
			return false, true
		}
		_, err = file.WriteAt(buffer, int64(currentSize))
		if err != nil {
			return false, true
		}
		currentSize += length
		check := fileSize - currentSize
		if 1024 > check && check > 0 {
			buffer = make([]byte, check)
		}
	}
	return false, false
}

func fileExists(filename string) bool {
	info, err := os.Stat(filename)
	if os.IsNotExist(err) {
		return false
	}
	return !info.IsDir()
}