using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Otter;

namespace OtterApp
{
    class SceneHandler : Scene
    {
        Dictionary<string,GameScene> availableScenes;
        int activeSceneID = 0;

        public SceneHandler() 
        {
            
            
            availableScenes = new Dictionary<string, GameScene>();

            GameScene DefaultScene = new GameScene("Default");
            AddGraphic(DefaultScene.getGraphics());

            availableScenes.Add("Default",DefaultScene);

            //TestScenes
            //createScene("Scene1");
            //createScene("Scene2");
            //createScene("Scene3");
            
        }

        public void createScene(string titel)
        {
            if (!availableScenes.ContainsKey(titel))
            {
                GameScene temp = new GameScene(titel);

                availableScenes.Add(temp.SCENENAME, temp);
                Console.WriteLine("{0} was created", titel);
            }
            else
                Console.WriteLine("Error - Scene Name is allready used");
        }

        private void loadScene(String loadSceneKey)
        {
            // loaded scene to adapt graphics & entities
            GameScene loadScene;
            availableScenes.TryGetValue(loadSceneKey, out loadScene);

            // only proceed if scene is enlisted
            if (availableScenes.ContainsValue(loadScene))
            {
                //reset graphics and entities
                this.RemoveAll();
                List<Entity> EntitiesToAdd = loadScene.GetEntitiesAll();

                //adapt the loaded scenes graphics
                this.SetGraphic(loadScene.getGraphics());

                //adapt the loaded scenes entites
                foreach (Entity copyEntity in EntitiesToAdd)
                {
                    this.Add(copyEntity);
                }

                Console.WriteLine("{0} was loaded",loadScene.SCENENAME);

            }
            else
                Console.WriteLine("Error - Scene '{0}' could not be loaded", loadSceneKey);
        }

        public void deleteScene(string titel)
        {
            if (availableScenes.ContainsKey(titel))
                availableScenes.Remove(titel);
            else
                Console.WriteLine("Error - Scene Name is not enlisted");
        }

        public Scene getCurrentScene()
        {
            return availableScenes.ElementAt(activeSceneID).Value;
        }

        
        public void addEntity(List<Entity> entityToAdd)
        {
            //funtzt nich eventuell entityToAdd als public list in gamescene oder hier einbauen damit bei loadscene eingebaut werden kann was in der scene gespeichert war
            //soll dafür sorgen dass scene "on the fly" neue entities und graphics hinzugefügt werden kann
            String tempKey = availableScenes.ElementAt(activeSceneID).Key;
            
            availableScenes.Remove(availableScenes.ElementAt(activeSceneID).Key);
            GameScene sceneToAdd = new GameScene(tempKey, entityToAdd);
            availableScenes.Add(tempKey, sceneToAdd);

            loadScene(tempKey);

        }
        


        public String getNextScene()
        {
            // increase Id of current Scene
            activeSceneID++;

            // If end of list reset to begin of list
            if (activeSceneID == availableScenes.Count)
                activeSceneID = 0;
            
             //return scene   
            return availableScenes.ElementAt(activeSceneID).Key;
        }

        public override void Update()
        {
            base.Update();

            if (Input.KeyPressed(Key.Space))
            {

                // When the space bar is pressed switch to the FirstScene.
                //Game.SwitchScene(getNextScene());
                loadScene(getNextScene());
            }
        }
    }
}