package operaSystem

import (
	"bufio"
	"encoding/base64"
	"os"
	"path/filepath"
	"strings"
	"time"
)

func (fl *OperaSystem) ByteToBase64(b []byte) string {
	return base64.StdEncoding.EncodeToString(b)
}

// Base64ToByte base64 string to byte
// baseStr parameter is base64 string
func (fl *OperaSystem) Base64ToByte(baseStr string) ([]byte, error) {
	return base64.StdEncoding.DecodeString(string(baseStr))
}

// ByteToFile The byte array is converted into a file and landed
// The parameter b is the bate array filePath file path
func (fl *OperaSystem) ByteToFile(b []byte, filePath string) error {
	//Open file Create a file if there is no file
	file, err := os.OpenFile(filePath, os.O_RDWR|os.O_CREATE, os.ModePerm)
	if err != nil {
		return err
	}
	_, err = file.Write(b)
	if err != nil {
		return err
	}
	defer func(file *os.File) {
		err := file.Close()
		if err != nil {
			panic(err)
		}
	}(file)
	return nil
}

func (fl *OperaSystem) FileName(filePath string) string {
	fileInfo, err := os.Stat(filePath)
	if err == nil {
		return fileInfo.Name()
	}
	return ""
} // FileName

func (fl *OperaSystem) FileSize(filePath string) int64 {
	fileInfo, err := os.Stat(filePath)
	if err == nil {
		return fileInfo.Size()
	}
	return 0
}

func (fl *OperaSystem) FileModTime(filePath string) time.Time {
	fileInfo, err := os.Stat(filePath)
	if err == nil {
		return fileInfo.ModTime()
	}
	return time.Time{}
}

func (fl *OperaSystem) FileMode(filePath string) os.FileMode {
	fileInfo, err := os.Stat(filePath)
	if err == nil {
		return fileInfo.Mode()
	}
	return 0
}

func (fl *OperaSystem) IsDir(filePath string) bool {
	fileInfo, err := os.Stat(filePath)
	if err == nil {
		return fileInfo.IsDir()
	}
	return false
}

// Exist 判断文件是否存在
func (tf *OperaSystem) FileExist(path string) bool {
	_, err := os.Lstat(path)
	return !os.IsNotExist(err)
}

// RemoveSuffix 删除文件后缀
func (tf *OperaSystem) RemoveSuffix(path string) string {
	suffix := filepath.Ext(path)
	if suffix != "" {
		return strings.Replace(path, suffix, "", -1)
	}
	return ""
}

// RemovePrefix 删除文件前缀
func (tf *OperaSystem) RemovePrefix(path string) string {
	prefix := filepath.Ext(path)
	if prefix != "" {
		return prefix[1:]
	}
	return ""
}

// FileAppendString 将String写入文件，追加模式
func (tf *OperaSystem) FileAppendString(content string, path string) (*os.File, error) {
	file, err := os.OpenFile(path, os.O_WRONLY|os.O_APPEND, 0666)
	if err != nil {
		return nil, err
	}
	defer file.Close()
	write := bufio.NewWriter(file)
	write.WriteString(content)
	write.Flush()
	return file, nil
}