package stl2gltf

import "encoding/binary"

// Triangle 50B
type Triangle struct {
	Normal    []byte // 4 * 3     12
	Position  []byte // 4 * 3 * 3 36
	Attribute []byte // 2         02

	XYZ []float32
}


//
//        header     num
//   |----80B------|-4B-|-----triangle1--------|--------triangle2-------|-----------...

//                    Normal(xyz) 4 x 3       position1       position2          position3         attribute
//   each triangle: |--------12--------|--------12--------|--------12--------|--------12--------|---2-------|
//  
//
//
//
type STL struct {
	Header      string
	TriangleNum int
	Triangles   []Triangle

	Max []float32
	Min []float32
}

type Asset struct {
	Version string `json:"version"`
}

type Scene struct {
	Nodes []int `json:"nodes"`
}

type Node struct {
	Mesh int `json:"mesh"`
}

type Primitive struct {
	Attributes map[string]int `json:"attributes"`
	Indices    int            `json:"indices"`
	Mode       int            `json:"mode"`
}

type Mesh struct {
	Primitives []Primitive `json:"primitives"`
}

type Buffer struct {
	Uri        string `json:"uri"`
	ByteLength int    `json:"byteLength"`
}

type BufferView struct {
	Buffer     int `json:"buffer"`
	ByteOffset int `json:"byteOffset"`
	ByteLength int `json:"byteLength"`
	Target     int `json:"target"`
}

type Accessor struct {
	BufferView    int       `json:"bufferView"`
	ByteOffset    int       `json:"byteOffset"`
	ComponentType int       `json:"componentType"`
	Count         int       `json:"count"`
	Type          string    `json:"type"`
	Max           []float32 `json:"max,omitempty"`
	Min           []float32 `json:"min,omitempty"`
}

type GLTF struct {
	Asset Asset `json:"asset"`

	Scenes []Scene `json:"scenes"`

	Nodes []Node `json:"nodes"`

	Meshes []Mesh `json:"meshes"`

	Buffers []Buffer `json:"buffers"`

	BufferViews []BufferView `json:"bufferViews"`

	Accessors []Accessor `json:"accessors"`
}