package utils

import (
	"crypto/md5"
	"fmt"
	. "github.com/coroot/coroot-node-agent/utils/modelse"
	"math"
	"os"
	"path"
	"strconv"
	"strings"
)

func init() {

}

var (
	APP_ID_INT64      int64
	HOST_ID_INT64     int64
	ACCOUNT_ID_INT    int
	INSTANCE_ID_INT64 int64

	APP_ID_BYTE      HashByte
	HOST_ID_BYTE     HashByte
	INSTANCE_ID_BYTE HashByte
)

func BuildInt64ID(str string) ID_STRING {
	srcCode := md5.Sum([]byte(str))
	code := fmt.Sprintf("%x", srcCode)

	id_string := md5ToDec(code)
	return ID_STRING(id_string)
}

func hexStringToBPFBytes(str string, out *HashByte) {
	for i := 0; i < len(str)/2; i++ {
		ch0 := str[2*i]
		ch1 := str[2*i+1]
		nib0 := (ch0 & 0x0F) + (ch0 >> 6) | ((ch0 >> 3) & 0x08)
		nib1 := (ch1 & 0x0F) + (ch1 >> 6) | ((ch1 >> 3) & 0x08)
		(*out)[i] = (nib0 << 4) | nib1
	}
}

// todo account id
func GetAccountID() int {
	if ACCOUNT_ID_INT != 0 {
		return ACCOUNT_ID_INT
	}
	ACCOUNT_ID_INT = 110
	return ACCOUNT_ID_INT
}

// todo HostId
func GetHostID() (int64, HashByte) {
	if HOST_ID_INT64 != 0 {
		return HOST_ID_INT64, HOST_ID_BYTE
	}
	uuid := MachineID()
	// todo AccountId
	str := fmt.Sprintf("%d:%s", GetAccountID(), uuid)
	srcCode := md5.Sum([]byte(str))
	code := fmt.Sprintf("%x", srcCode)
	host_id_string := md5ToDec(code)
	id, err := strconv.ParseInt(host_id_string, 10, 64)
	if err != nil {
		return 0, HashByte{}
	}

	HOST_ID_INT64 = id

	var charArray HashByte
	hexStringToBPFBytes(host_id_string, &charArray)
	HOST_ID_BYTE = charArray
	// 将rune切片复制到char数组中
	//for i := 0; i < HASH_SIZE; i++ {
	//	charArray[i] = []byte(host_id_string)[i]
	//}
	return id, charArray
}

func GetIntHostID() int64 {
	id, _ := GetHostID()
	return id
}

func MachineID() string {
	for _, p := range []string{"sys/devices/virtual/dmi/id/product_uuid", "etc/machine-id", "var/lib/dbus/machine-id"} {
		payload, err := os.ReadFile(path.Join("/proc/1/root", p))
		if err != nil {
			continue
		}
		id := strings.TrimSpace(strings.Replace(string(payload), "\n", "", -1))
		return id
	}
	return ""
}

func hexdec(hexStr string) int {
	dec, _ := strconv.ParseInt(hexStr, 16, 64)
	return int(dec)
}

func md5ToDec(str string) string {
	strCode := ""
	for i := 0; i < 16; i++ {
		strCode += strconv.Itoa(int(math.Floor(float64(hexdec(string(str[i]))) / 16.0 * 10)))
		if i == 0 && strings.TrimSpace(strCode) == "0" {
			strCode = "1" + strCode
		}
	}
	return strCode
}