//go:build example
// +build example

package system

import (
	"code.rocketnine.space/tslocum/gohan"
	"code.rocketnine.space/tslocum/gohan/_examples/twinstick/asset"
	"code.rocketnine.space/tslocum/gohan/_examples/twinstick/component"
	"github.com/hajimehoshi/ebiten/v2"
)

type drawPlayerSystem struct {
	player gohan.EntityID
	op     *ebiten.DrawImageOptions
}

func NewDrawPlayerSystem(player gohan.EntityID) *drawPlayerSystem {
	return &drawPlayerSystem{
		player: player,
		op:     &ebiten.DrawImageOptions{},
	}
}

func (s *drawPlayerSystem) Matches(entity gohan.EntityID) bool {
	return entity == s.player
}

func (s *drawPlayerSystem) Update(_ gohan.EntityID) error {
	return gohan.ErrSystemWithoutUpdate
}

func (s *drawPlayerSystem) Draw(entity gohan.EntityID, screen *ebiten.Image) error {
	position := entity.Component(component.PositionComponentID).(*component.PositionComponent)

	s.op.GeoM.Reset()
	s.op.GeoM.Translate(position.X-16, position.Y-16)
	screen.DrawImage(asset.ImgWhiteSquare, s.op)
	return nil
}