package starcrypto

import (
	"crypto/md5"
	"crypto/sha1"
	"crypto/sha256"
	"crypto/sha512"
	"encoding/hex"
	"errors"
	"hash"
	"hash/crc32"
	"io"
	"os"
)

// SumAll 可以对同一数据进行多种校验
func SumAll(data []byte, method []string) (map[string][]byte, error) {
	result := make(map[string][]byte)
	methods := make(map[string]hash.Hash)
	var iscrc bool
	if len(method) == 0 {
		method = []string{"sha512", "sha256", "sha384", "sha224", "sha1", "crc32", "md5"}
	}
	sum512 := sha512.New()
	sum384 := sha512.New384()
	sum256 := sha256.New()
	sum224 := sha256.New224()
	sum1 := sha1.New()
	crcsum := crc32.NewIEEE()
	md5sum := md5.New()
	for _, v := range method {
		switch v {
		case "md5":
			methods["md5"] = md5sum
		case "crc32":
			iscrc = true
		case "sha1":
			methods["sha1"] = sum1
		case "sha224":
			methods["sha224"] = sum224
		case "sha256":
			methods["sha256"] = sum256
		case "sha384":
			methods["sha384"] = sum384
		case "sha512":
			methods["sha512"] = sum512
		}
	}
	for _, v := range methods {
		v.Write(data)
	}
	if iscrc {
		crcsum.Write(data)
	}

	for k, v := range methods {
		result[k] = v.Sum(nil)
	}
	if iscrc {
		result["crc32"] = crcsum.Sum(nil)
	}
	return result, nil
}

// FileSum 输出文件内容校验值，method为单个校验方法,小写
// 例：FileSum("./test.txt","md5",shell(pect float64){fmt.Sprintf("已完成 %f\r",pect)})
func FileSum(filepath, method string, shell func(float64)) (string, error) {
	var sum hash.Hash
	var sum32 hash.Hash32
	var issum32 bool
	var result string
	fp, err := os.Open(filepath)
	if err != nil {
		return "", err
	}
	switch method {
	case "sha512":
		sum = sha512.New()
	case "sha384":
		sum = sha512.New384()
	case "sha256":
		sum = sha256.New()
	case "sha224":
		sum = sha256.New224()
	case "sha1":
		sum = sha1.New()
	case "crc32":
		sum32 = crc32.NewIEEE()
		issum32 = true
	case "md5":
		sum = md5.New()
	default:
		return "", errors.New("Cannot Recognize The Method:" + method)
	}
	writer := 0
	stat, _ := os.Stat(filepath)
	filebig := float64(stat.Size())
	if !issum32 {
		//	if _, err := io.Copy(sum, fp); err != nil {
		for {
			buf := make([]byte, 1048574)
			n, err := fp.Read(buf)
			if err != nil {
				if err == io.EOF {
					break
				}
				return result, err
			}
			writer += n
			pect := (float64(writer) / filebig) * 100
			go shell(pect)
			sum.Write(buf[0:n])
		}
		result = hex.EncodeToString(sum.Sum(nil))
	} else {
		for {
			buf := make([]byte, 1048574)
			n, err := fp.Read(buf)
			if err != nil {
				if err == io.EOF {
					break
				}
				return result, err
			}
			writer += n
			pect := (float64(writer) / filebig) * 100
			go shell(pect)
			sum32.Write(buf[0:n])
		}
		result = hex.EncodeToString(sum32.Sum(nil))
	}
	return result, nil
}

// FileSumAll 可以对同一文件进行多种校验
func FileSumAll(filepath string, method []string, shell func(float64)) (map[string]string, error) {
	result := make(map[string]string)
	methods := make(map[string]hash.Hash)
	var iscrc bool

	if len(method) == 0 {
		method = []string{"sha512", "sha256", "sha384", "sha224", "sha1", "crc32", "md5"}
	}
	fp, err := os.Open(filepath)
	defer fp.Close()
	if err != nil {
		return result, err
	}
	stat, _ := os.Stat(filepath)
	filebig := float64(stat.Size())
	sum512 := sha512.New()
	sum384 := sha512.New384()
	sum256 := sha256.New()
	sum224 := sha256.New224()
	sum1 := sha1.New()
	crcsum := crc32.NewIEEE()
	md5sum := md5.New()
	for _, v := range method {
		switch v {
		case "md5":
			methods["md5"] = md5sum
		case "crc32":
			iscrc = true
		case "sha1":
			methods["sha1"] = sum1
		case "sha224":
			methods["sha224"] = sum224
		case "sha256":
			methods["sha256"] = sum256
		case "sha384":
			methods["sha384"] = sum384
		case "sha512":
			methods["sha512"] = sum512
		}
	}

	writer := 0
	for {
		buf := make([]byte, 1048574)
		n, err := fp.Read(buf)
		if err != nil {
			if err == io.EOF {
				break
			}
			return result, err
		}
		writer += n
		pect := (float64(writer) / filebig) * 100
		go shell(pect)
		for _, v := range methods {
			v.Write(buf[0:n])
		}
		if iscrc {
			crcsum.Write(buf[0:n])
		}
	}
	for k, v := range methods {
		result[k] = hex.EncodeToString(v.Sum(nil))
	}
	if iscrc {
		result["crc32"] = hex.EncodeToString(crcsum.Sum(nil))
	}
	return result, nil
}