package game

import (
	"mountain/internal/scenes"

	"github.com/hajimehoshi/ebiten/v2"
)

// SceneType represents the different scenes in the game.
type SceneType int

const (
	SceneMainMenu SceneType = iota
	ScenePlay
)

// Scene interface defines standard methods a state/scene must have.
type Scene interface {
	Update() error
	Draw(screen *ebiten.Image)
}

// Game implements ebiten.Game interface.
type Game struct {
	currentScene     Scene
	currentSceneType SceneType
}

func NewGame() *Game {
	g := &Game{}
	g.ChangeScene(SceneMainMenu)
	return g
}

func (g *Game) Update() error {
	// Handle global input for scene switching maybe?
	if g.currentSceneType == SceneMainMenu && ebiten.IsKeyPressed(ebiten.KeyEnter) {
		g.ChangeScene(ScenePlay)
	}

	if g.currentScene != nil {
		return g.currentScene.Update()
	}
	return nil
}

func (g *Game) Draw(screen *ebiten.Image) {
	if g.currentScene != nil {
		g.currentScene.Draw(screen)
	}
}

func (g *Game) Layout(outsideWidth, outsideHeight int) (screenWidth, screenHeight int) {
	return 800, 600
}

func (g *Game) ChangeScene(s SceneType) {
	g.currentSceneType = s
	switch s {
	case SceneMainMenu:
		g.currentScene = scenes.NewMenuScene()
	case ScenePlay:
		g.currentScene = scenes.NewPlayScene()
	}
}