package _189

import (
	"bytes"
	"crypto/aes"
	"crypto/hmac"
	"crypto/rand"
	"crypto/rsa"
	"crypto/sha1"
	"crypto/x509"
	"encoding/base64"
	"encoding/hex"
	"encoding/pem"
	"fmt"
	rand2 "math/rand"
	"net/http"
	"net/url"
	"sort"
	"strings"
	"time"

	"github.com/Xhofe/alist/model"
)

const (
	APP_ID      = "8025431004"
	CLIENT_TYPE = "10020"
	VERSION     = "6.2"

	WEB_URL    = "https://cloud.189.cn"
	AUTH_URL   = "https://open.e.189.cn"
	API_URL    = "https://api.cloud.189.cn"
	UPLOAD_URL = "https://upload.cloud.189.cn"

	RETURN_URL = "https://m.cloud.189.cn/zhuanti/2020/loginErrorPc/index.html"

	PC  = "TELEPC"
	MAC = "TELEMAC"

	CHANNEL_ID = "web_cloud.189.cn"
)

func clientSuffix() map[string]string {
	return map[string]string{
		"clientType": PC,
		"version":    VERSION,
		"channelId":  CHANNEL_ID,
		"rand":       fmt.Sprintf("%d_%d", rand2.Int63n(1e5), rand2.Int63n(1e10)),
	}
}

// 带params的SignatureOfHmac HMAC签名
func signatureOfHmac(sessionSecret, sessionKey, operate, fullUrl, dateOfGmt, param string) string {
	u, _ := url.Parse(fullUrl)
	mac := hmac.New(sha1.New, []byte(sessionSecret))
	data := fmt.Sprintf("SessionKey=%s&Operate=%s&RequestURI=%s&Date=%s", sessionKey, operate, u.Path, dateOfGmt)
	if param != "" {
		data += fmt.Sprintf("&params=%s", param)
	}
	mac.Write([]byte(data))
	return strings.ToUpper(hex.EncodeToString(mac.Sum(nil)))
}

// 获取http规范的时间
func getHttpDateStr() string {
	return time.Now().UTC().Format(http.TimeFormat)
}

// RAS 加密用户名密码
func rsaEncrypt(publicKey, origData string) string {
	block, _ := pem.Decode([]byte(publicKey))
	pubInterface, _ := x509.ParsePKIXPublicKey(block.Bytes)
	data, _ := rsa.EncryptPKCS1v15(rand.Reader, pubInterface.(*rsa.PublicKey), []byte(origData))
	return base64ToHex(base64.StdEncoding.EncodeToString(data))
}

// aes 加密params
func AesECBEncrypt(data, key string) string {
	block, _ := aes.NewCipher([]byte(key))
	paddingData := PKCS7Padding([]byte(data), block.BlockSize())
	decrypted := make([]byte, len(paddingData))
	size := block.BlockSize()
	for src, dst := paddingData, decrypted; len(src) > 0; src, dst = src[size:], dst[size:] {
		block.Encrypt(dst[:size], src[:size])
	}
	return strings.ToUpper(hex.EncodeToString(decrypted))
}

func PKCS7Padding(ciphertext []byte, blockSize int) []byte {
	padding := blockSize - len(ciphertext)%blockSize
	padtext := bytes.Repeat([]byte{byte(padding)}, padding)
	return append(ciphertext, padtext...)
}

// 时间戳
func timestamp() int64 {
	return time.Now().UTC().UnixNano() / 1e6
}

func base64ToHex(a string) string {
	v, _ := base64.StdEncoding.DecodeString(a)
	return strings.ToUpper(hex.EncodeToString(v))
}

func isFamily(account *model.Account) bool {
	return account.InternalType == "Family"
}

func toFamilyOrderBy(o string) string {
	switch o {
	case "filename":
		return "1"
	case "filesize":
		return "2"
	case "lastOpTime":
		return "3"
	default:
		return "1"
	}
}

func ParseHttpHeader(str string) map[string]string {
	header := make(map[string]string)
	for _, value := range strings.Split(str, "&") {
		i := strings.Index(value, "=")
		header[strings.TrimSpace(value[0:i])] = strings.TrimSpace(value[i+1:])
	}
	return header
}

func MustString(str string, err error) string {
	return str
}

func MustToBytes(b []byte, err error) []byte {
	return b
}

func BoolToNumber(b bool) int {
	if b {
		return 1
	}
	return 0
}

func MustParseTime(str string) *time.Time {
	loc, _ := time.LoadLocation("Local")
	lastOpTime, _ := time.ParseInLocation("2006-01-02 15:04:05", str, loc)
	return &lastOpTime
}

type Params map[string]string

func (p Params) Set(k, v string) {
	p[k] = v
}

func (p Params) Encode() string {
	if p == nil {
		return ""
	}
	var buf strings.Builder
	keys := make([]string, 0, len(p))
	for k := range p {
		keys = append(keys, k)
	}
	sort.Strings(keys)
	for _, k := range keys {
		if buf.Len() > 0 {
			buf.WriteByte('&')
		}
		buf.WriteString(k)
		buf.WriteByte('=')
		buf.WriteString(p[k])
	}
	return buf.String()
}