package physics

import rl "github.com/gen2brain/raylib-go/raylib"

// Object defines the interface for physical objects.
//
// This is defined here in the object.go file because after
// passing an 'object' to an 'entity' (e.g. 'penguin'),
// then to a 'player', as well as the main function,
// we needed almost all of the functions for the whole
// interface defined in each place.
type Object interface {
	Update() error

	GetPosition() rl.Vector2
	GetVelocity() rl.Vector2
	GetAcceleration() rl.Vector2
	GetBaseAcceleration() rl.Vector2

	SetPosition(pos rl.Vector2)
	SetVelocity(vel rl.Vector2)
	SetAcceleration(acc rl.Vector2)
	SetBaseAcceleration(base rl.Vector2)
}

type object struct {
	position         rl.Vector2
	velocity         rl.Vector2
	acceleration     rl.Vector2
	baseAcceleration rl.Vector2 // some default speed for this object
}

func NewObject() *object {
	pos := rl.Vector2{X: 0.0, Y: 0.0}
	vel := rl.Vector2{X: 0.0, Y: 0.0}
	acc := rl.Vector2{X: 0.0, Y: 0.0}
	base := rl.Vector2{X: 1.0, Y: 1.0}

	return &object{
		position:         pos,
		velocity:         vel,
		acceleration:     acc,
		baseAcceleration: base,
	}
}

func (o *object) Update() error {
	p := o.position
	v := o.velocity
	a := o.acceleration

	v = rl.Vector2Add(v, a)
	o.velocity = v

	p = rl.Vector2Add(p, v)
	o.position = p

	return nil
}

func (o *object) SetPosition(pos rl.Vector2) {
	o.position = pos
}

func (o *object) SetVelocity(vel rl.Vector2) {
	o.velocity = vel
}
func (o *object) SetAcceleration(acc rl.Vector2) {
	o.acceleration = acc
}

func (o *object) SetBaseAcceleration(base rl.Vector2) {
	o.baseAcceleration = base
}

func (o *object) GetPosition() rl.Vector2 {
	return o.position
}
func (o *object) GetVelocity() rl.Vector2 {
	return o.velocity
}
func (o *object) GetAcceleration() rl.Vector2 {
	return o.acceleration
}
func (o *object) GetBaseAcceleration() rl.Vector2 {
	return o.baseAcceleration
}