package animation

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

type SpriteAnimation interface {
	Draw(
		frame int,
		windowPosition rl.Vector2,
		angle float32,
		center rl.Vector2,
		flip rl.Vector2,
		color rl.Color,
	) error
}

var (
	FlipNone       = rl.Vector2{X: 0, Y: 0}
	FlipHorizontal = rl.Vector2{X: 1, Y: 0}
	FlipVertical   = rl.Vector2{X: 0, Y: 1}
	FlipBoth       = rl.Vector2{X: 1, Y: 1}
)

// An entityAnimation will take a SpriteAnimation and may manipulate it somehow (e.g. flipped for walking the other direction)
// This way you may cut down the actual number of pictures needed to define all the different animations.
type entityAnimation struct {
	spriteAnimation SpriteAnimation
	speed           int
	length          int
	angle           float32
	center          rl.Vector2
	flip            rl.Vector2
}

func NewEntityAnimation(
	spriteAnimation SpriteAnimation,
	speed int,
	length int,
	angle float32,
	center rl.Vector2,
	flip rl.Vector2,
) entityAnimation {

	return entityAnimation{
		spriteAnimation: spriteAnimation,
		speed:           speed,
		length:          length,
		angle:           angle,
		center:          center,
		flip:            flip,
	}
}

func (e entityAnimation) Draw(frame int, windowPosition rl.Vector2, color rl.Color) error {
	return e.spriteAnimation.Draw(frame, windowPosition, e.angle, e.center, e.flip, color)
}

func (e entityAnimation) GetSpeed() int {
	return e.speed
}

func getCenter(dimensions rl.Vector2) rl.Vector2 {
	x := dimensions.X / 2.0
	y := dimensions.Y / 2.0

	return rl.Vector2{X: x, Y: y}
}