package game

import (
	"encoding/binary"
	"math"
)

// Vector3 represents a 3-dimensional vector using 32-bit float precision.
type Vector3 struct {
	X float32 `json:"x"`
	Y float32 `json:"y"`
	Z float32 `json:"z"`
}

// AppendVector3 appends the raw bits of the vector to the given byte slice in XYZ order.
func AppendVector3(data []byte, vector Vector3) []byte {
	data = AppendFloat(data, vector.X)
	data = AppendFloat(data, vector.Y)
	data = AppendFloat(data, vector.Z)
	return data
}

// AppendFloat appends the raw bits of the float to the given byte slice in XYZ order.
func AppendFloat(data []byte, value float32) []byte {
	bits := math.Float32bits(value)
	return binary.LittleEndian.AppendUint32(data, bits)
}

func Vector3FromBytes(data []byte) Vector3 {
	return Vector3{
		X: math.Float32frombits(binary.LittleEndian.Uint32(data)),
		Y: math.Float32frombits(binary.LittleEndian.Uint32(data[4:])),
		Z: math.Float32frombits(binary.LittleEndian.Uint32(data[8:])),
	}
}