package face

import (
	"fmt"
	"strconv"
	"unsafe"
)

func ByteSlice2float32Slice(src []byte) []float32 {
	if len(src) == 0 {
		return nil
	}

	l := len(src) / 4
	ptr := unsafe.Pointer(&src[0])

	return (*[1 << 26]float32)((*[1 << 26]float32)(ptr))[:l:l]
}

func DoSdkCompare(ci, co []float32) float32 {
	sec := DirectCompare(ci, co)
	//logger.Debug("比对得分为：", sec)

	sec = ParseScore(sec)
	return sec
}

func DirectCompare(feat1 []float32, feat2 []float32) float32 {
	if len(feat1) != len(feat2) {
		return 0
	}

	var score float32
	if len(feat1) != len(feat2) {
		return 0
	}
	l := len(feat1)
	if l == 0 {
		return 0
	}
	for i := 0; i < l; i++ {
		score += feat1[i] * feat2[i]
	}
	score += 0.05
	if score > 0.9999 {
		score = 0.9999
	}
	if score < 0.0001 {
		score = 0.0001
	}

	//fmt.Println("score:", score)
	return score
}

func ParseScore(compareScore float32) float32 {
	if compareScore <= 1 {
		compareScore = compareScore * 100
	}
	if compareScore == 100 {
		return 100
	}
	f, _ := strconv.ParseFloat(fmt.Sprintf("%2.2f", compareScore), 32)

	return float32(f)
}