package gopay

import (
	"crypto/tls"
	"encoding/xml"
	"io"
	"math/rand"
	"reflect"
	"sort"
	"strconv"
	"strings"
	"time"

	"github.com/parnurzeal/gorequest"
)

type BodyMap map[string]interface{}

//设置参数
//    value：仅支持类型 string,int,int64,float32,float64,ptr,struct,slice,map 类型，其他类型一律设置空字符串
func (bm BodyMap) Set(key string, value interface{}) {
	vKind := reflect.ValueOf(value).Kind()
	switch vKind {
	case reflect.String:
		bm[key] = value.(string)
	case reflect.Int:
		bm[key] = Int2String(value.(int))
	case reflect.Int64:
		bm[key] = Int642String(value.(int64))
	case reflect.Float32:
		bm[key] = Float32ToString(value.(float32))
	case reflect.Float64:
		bm[key] = Float64ToString(value.(float64))
	case reflect.Ptr:
		bm[key] = value
	case reflect.Struct:
		bm[key] = value
	case reflect.Map:
		bm[key] = value
	case reflect.Slice:
		bm[key] = value
	default:
		bm[key] = ""
	}
}

//获取参数
func (bm BodyMap) Get(key string) string {
	if bm == nil {
		return null
	}
	var (
		value interface{}
		ok    bool
		v     string
	)
	if value, ok = bm[key]; !ok {
		return null
	}
	if v, ok = value.(string); ok {
		return v
	}
	return jsonToString(value)
}

//删除参数
func (bm BodyMap) Remove(key string) {
	delete(bm, key)
}

type xmlMapEntry struct {
	XMLName xml.Name
	Value   string `xml:",chardata"`
}

func (bm BodyMap) MarshalXML(e *xml.Encoder, start xml.StartElement) (err error) {
	if len(bm) == 0 {
		return nil
	}
	var (
		value string
		vKind reflect.Kind
	)
	if err = e.EncodeToken(start); err != nil {
		return
	}
	for k, v := range bm {
		vKind = reflect.ValueOf(v).Kind()
		switch vKind {
		case reflect.String:
			value = v.(string)
		case reflect.Int:
			value = Int2String(v.(int))
		case reflect.Int64:
			value = Int642String(v.(int64))
		case reflect.Float32:
			value = Float32ToString(v.(float32))
		case reflect.Float64:
			value = Float64ToString(v.(float64))
		default:
			value = ""
		}
		e.Encode(xmlMapEntry{XMLName: xml.Name{Local: k}, Value: value})
	}
	return e.EncodeToken(start.End())
}

func (bm *BodyMap) UnmarshalXML(d *xml.Decoder, start xml.StartElement) (err error) {
	for {
		var e xmlMapEntry
		err = d.Decode(&e)
		if err == io.EOF {
			break
		} else if err != nil {
			return
		}
		bm.Set(e.XMLName.Local, e.Value)
	}
	return
}

// ("bar=baz&foo=quux") sorted by key.
func (bm BodyMap) EncodeWeChatSignParams(apiKey string) string {
	var (
		buf     strings.Builder
		keyList []string
	)
	keyList = make([]string, 0, len(bm))
	for k := range bm {
		keyList = append(keyList, k)
	}
	sort.Strings(keyList)
	for _, k := range keyList {
		buf.WriteString(k)
		buf.WriteByte('=')
		buf.WriteString(bm.Get(k))
		buf.WriteByte('&')
	}
	buf.WriteString("key")
	buf.WriteByte('=')
	buf.WriteString(apiKey)
	return buf.String()
}

// ("bar=baz&foo=quux") sorted by key.
func (bm BodyMap) EncodeAliPaySignParams() string {
	var (
		buf     strings.Builder
		keyList []string
	)
	keyList = make([]string, 0, len(bm))
	for k := range bm {
		keyList = append(keyList, k)
	}
	sort.Strings(keyList)
	for _, k := range keyList {
		buf.WriteString(k)
		buf.WriteByte('=')
		buf.WriteString(bm.Get(k))
		buf.WriteByte('&')
	}
	return buf.String()[:buf.Len()]
}

//HttpAgent
func HttpAgent() (agent *gorequest.SuperAgent) {
	return gorequest.New().TLSClientConfig(&tls.Config{InsecureSkipVerify: true})
}

//获取随机字符串
//    length：字符串长度
func GetRandomString(length int) string {
	str := "0123456789AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz"
	var (
		result []byte
		b      []byte
		r      *rand.Rand
	)
	b = []byte(str)
	r = rand.New(rand.NewSource(time.Now().UnixNano()))
	for i := 0; i < length; i++ {
		result = append(result, b[r.Intn(len(b))])
	}
	return string(result)
}

//解析时间
func ParseDateTime(timeStr string) (datetime time.Time) {
	datetime, _ = time.ParseInLocation(TimeLayout, timeStr, time.Local)
	return
}

//字符串转Float64
func String2Float64(floatStr string) (floatNum float64) {
	floatNum, _ = strconv.ParseFloat(floatStr, 64)
	return
}

//字符串转Float32
func String2Float32(floatStr string) (floatNum float32) {
	float, _ := strconv.ParseFloat(floatStr, 32)
	floatNum = float32(float)
	return
}

//Float64转字符串
//    floatNum：float64数字
//    prec：精度位数（不传则默认float数字精度）
func Float64ToString(floatNum float64, prec ...int) (floatStr string) {
	if len(prec) > 0 {
		floatStr = strconv.FormatFloat(floatNum, 'f', prec[0], 64)
		return
	}
	floatStr = strconv.FormatFloat(floatNum, 'f', -1, 64)
	return
}

//Float32转字符串
//    floatNum：float32数字
//    prec：精度位数（不传则默认float数字精度）
func Float32ToString(floatNum float32, prec ...int) (floatStr string) {
	if len(prec) > 0 {
		floatStr = strconv.FormatFloat(float64(floatNum), 'f', prec[0], 32)
		return
	}
	floatStr = strconv.FormatFloat(float64(floatNum), 'f', -1, 32)
	return
}

//字符串转Int
func String2Int(intStr string) (intNum int) {
	intNum, _ = strconv.Atoi(intStr)
	return
}

//字符串转Int32
func String2Int32(intStr string) (int32Num int32) {
	intNum, _ := strconv.Atoi(intStr)
	int32Num = int32(intNum)
	return
}

//字符串转Int64
func String2Int64(intStr string) (int64Num int64) {
	intNum, _ := strconv.Atoi(intStr)
	int64Num = int64(intNum)
	return
}

//Int转字符串
func Int2String(intNum int) (intStr string) {
	intStr = strconv.Itoa(intNum)
	return
}

//Int32转字符串
func Int322String(intNum int32) (int32Str string) {
	//10, 代表10进制
	int32Str = strconv.FormatInt(int64(intNum), 10)
	return
}

//Int64转字符串
func Int642String(intNum int64) (int64Str string) {
	//10, 代表10进制
	int64Str = strconv.FormatInt(intNum, 10)
	return
}

//解密填充模式（去除补全码） PKCS7UnPadding
//解密时，需要在最后面去掉加密时添加的填充byte
func PKCS7UnPadding(origData []byte) (bs []byte) {
	length := len(origData)
	unPaddingNumber := int(origData[length-1]) //找到Byte数组最后的填充byte 数字
	if unPaddingNumber <= 16 {
		bs = origData[:(length - unPaddingNumber)] //只截取返回有效数字内的byte数组
	} else {
		bs = origData
	}
	return
}

//解密填充模式（去除补全码） PKCS5UnPadding
//解密时，需要在最后面去掉加密时添加的填充byte
func PKCS5UnPadding(origData []byte) (bs []byte) {
	length := len(origData)
	unPaddingNumber := int(origData[length-1]) //找到Byte数组最后的填充byte
	if unPaddingNumber <= 16 {
		bs = origData[:(length - unPaddingNumber)] //只截取返回有效数字内的byte数组
	} else {
		bs = origData
	}
	return
}