package models

import (
	"encoding/binary"
	"math"
)

type Reader struct {
	buf []byte
	off int
}

func NewReader(b []byte) *Reader {
	return &Reader{buf: b}
}

func (r *Reader) ReadU8() uint8 {
	v := r.buf[r.off]
	r.off++
	return v
}

func (r *Reader) ReadU16() uint16 {
	v := binary.LittleEndian.Uint16(r.buf[r.off:])
	r.off += 2
	return v
}

func (r *Reader) ReadU32() uint32 {
	v := binary.LittleEndian.Uint32(r.buf[r.off:])
	r.off += 4
	return v
}

func (r *Reader) ReadF32() float32 {
	v := math.Float32frombits(binary.LittleEndian.Uint32(r.buf[r.off:]))
	r.off += 4
	return v
}

func (r *Reader) ReadBool() bool {
	return r.ReadU8() == 1
}

func (r *Reader) ReadString() string {
	l := r.ReadU16()
	s := string(r.buf[r.off : r.off+int(l)])
	r.off += int(l)
	return s
}