//-----------------------------------------------------------------------------
// RacingGameManager.cs
//
// Microsoft XNA Community Game Platform
// Copyright (C) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using System;
using System.Collections.Generic;
using System.Threading;
using RacingGame.GameLogic;
using RacingGame.GameScreens;
using RacingGame.Graphics;
using RacingGame.Helpers;
using RacingGame.Landscapes;
using RacingGame.Sounds;
using Model = RacingGame.Graphics.Model;
using Texture = RacingGame.Graphics.Texture;
using RacingGame.Properties;
using RacingGame.Shaders;
using System.Threading.Tasks;

namespace RacingGame
{
    /// <summary>
    /// This is the main entry class our game. Handles all game screens,
    /// which themself handle all the game logic.
    /// As you can see this class is very simple, which is really cool.
    /// </summary>
    public class RacingGameManager : BaseGame
    {
        /// <summary>
        /// Game screens stack. We can easily add and remove game screens
        /// and they follow the game logic automatically. Very cool.
        /// </summary>
        private static Stack<IGameScreen> gameScreens = new Stack<IGameScreen>();

        /// <summary>
        /// Player for the game, also allows us to control the car and contains
        /// all the required code for the car physics, chase camera and basic
        /// player values and the game time because this is the top class
        /// of many derived classes. Player, car and camera position is set
        /// when the game starts depending on the selected level.
        /// </summary>
        private static Player player = new Player(new Vector3(0, 0, 0));

        /// <summary>
        /// Car model and selection plate for the car selection screen.
        /// </summary>
        private static Model carModel = null,
            carSelectionPlate = null;

        /// <summary>
        /// Car textures we exchange for our car model.
        /// </summary>
        private static Texture[] carTextures = null;

        /// <summary>
        /// The player can select between the 3 cars: 0 (white), 1 (red) and
        /// 2 (yellow).
        /// </summary>
        public static int currentCarNumber = 0;

        /// <summary>
        /// The player can also select a car color, which will be used to
        /// recolor the car. Looks best for the first car (white).
        /// </summary>
        public static int currentCarColor;// Color carColor = Color.White;

        /// <summary>
        /// Helper texture for color selection
        /// </summary>
        public static Texture colorSelectionTexture = null;

        /// <summary>
        /// Material for brake tracks on the road.
        /// </summary>
        private static Material brakeTrackMaterial = null;

        /// <summary>
        /// Car colors for the car selection screen.
        /// </summary>
        public static List<Color> CarColors = new List<Color>(
            new Color[]
            {
                Color.White,
                Color.Yellow,
                Color.Blue,
                Color.Purple,
                Color.Red,
                Color.Green,
                Color.Teal,
                Color.Gray,
                Color.Chocolate,
                Color.MonoGameOrange,
                Color.SeaGreen,
            });

        /// <summary>
        /// Landscape we are currently using.
        /// </summary>
        private static Landscape landscape = null;

        /// <summary>
        /// Level we use for our track and landscape
        /// </summary>
        public enum Level
        {
            Beginner,
            Advanced,
            Expert,
        }

        /// <summary>
        /// Load level
        /// </summary>
        /// <param name="setNewLevel">Set new level</param>
        public static void LoadLevel(Level setNewLevel)
        {
            landscape.ReloadLevel(setNewLevel);
        }

        public static event EventHandler<EventArgs> LoadEvent;
        /// <summary>
        /// In menu
        /// </summary>
        /// <returns>Bool</returns>
        public static bool InMenu
        {
            get
            {
                return gameScreens.Count > 0 &&
                    gameScreens.Peek().GetType() != typeof(GameScreen);
            }
        }

        /// <summary>
        /// In game?
        /// </summary>
        public static bool InGame
        {
            get
            {
                return gameScreens.Count > 0 &&
                    gameScreens.Peek().GetType() == typeof(GameScreen);
            }
        }

        /// <summary>
        /// ShowMouseCursor
        /// </summary>
        /// <returns>Bool</returns>
        public static bool ShowMouseCursor
        {
            get
            {
                // Only if not in Game, not in splash screen!
                return gameScreens.Count > 0 &&
                    gameScreens.Peek().GetType() != typeof(GameScreen) &&
                    gameScreens.Peek().GetType() != typeof(SplashScreen) &&
                    gameScreens.Peek().GetType() != typeof(LoadingScreen);
            }
        }

        /// <summary>
        /// In car selection screen
        /// </summary>
        /// <returns>Bool</returns>
        public static bool InCarSelectionScreen
        {
            get
            {
                return gameScreens.Count > 0 &&
                    gameScreens.Peek().GetType() == typeof(CarSelection);
            }
        }

        /// <summary>
        /// Player for the game, also allows us to control the car and contains
        /// all the required code for the car physics, chase camera and basic
        /// player values and the game time because this is the top class
        /// of many derived classes.
        /// Easy access here with a static property in case we need the player
        /// somewhere in the game.
        /// </summary>
        /// <returns>Player</returns>
        public static Player Player
        {
            get
            {
                return player;
            }
        }

        /// <summary>
        /// Car model
        /// </summary>
        /// <returns>Model</returns>
        public static Model CarModel
        {
            get
            {
                return carModel;
            }
        }

        /// <summary>
        /// Car color
        /// </summary>
        /// <returns>Color</returns>
        public static Color CarColor
        {
            get
            {
                return CarColors[currentCarColor % CarColors.Count];
            }
        }

        /// <summary>
        /// Number of car colors
        /// </summary>
        /// <returns>Int</returns>
        public static int NumberOfCarColors
        {
            get
            {
                return CarColors.Count;
            }
        }

        /// <summary>
        /// Number of car texture types
        /// </summary>
        /// <returns>Int</returns>
        public static int NumberOfCarTextureTypes
        {
            get
            {
                return carTextures.Length;
            }
        }

        /// <summary>
        /// Car texture
        /// </summary>
        /// <param name="carNumber">Car number</param>
        /// <returns>Texture</returns>
        public static Texture CarTexture(int carNumber)
        {
            return carTextures[carNumber % carTextures.Length];
        }

        /// <summary>
        /// Brake track material
        /// </summary>
        /// <returns>Material</returns>
        public static Material BrakeTrackMaterial
        {
            get
            {
                return brakeTrackMaterial;
            }
        }

        /// <summary>
        /// Car selection plate
        /// </summary>
        /// <returns>Model</returns>
        public static Model CarSelectionPlate
        {
            get
            {
                return carSelectionPlate;
            }
        }

        /// <summary>
        /// Landscape we are currently using, used for several things (menu
        /// background, the game, some other classes outside the landscape class).
        /// </summary>
        /// <returns>Landscape</returns>
        public static Landscape Landscape
        {
            get
            {
                return landscape;
            }
        }

        /// <summary>
		/// The Task that will load most of the content for this game
        /// in the background, while the loading screen is shown.
		/// </summary>
        private static Task loadingTask;
        public static Task LoadingTask
        {
            get
            {
                return loadingTask;
            }
            set
            {
                loadingTask = value;
            }
        }

        public static bool ContentLoaded
        {
            get
            {
                return loadingTask?.IsCompleted == true;
            }
        }
        /// <summary>
        /// Create Racing game
        /// </summary>
        public RacingGameManager()
            : base("RacingGame")
        {
            Sound.Initialize();
            // Start playing the menu music
            //Sound.Play(Sound.Sounds.MenuMusic);

            // Create main menu at our main entry point
            gameScreens.Push(new MainMenu());

            // But start with splash screen, if user clicks or presses Start,
            // we are back in the main menu.
            gameScreens.Push(new SplashScreen());

            //We want to initially show the loading screen while things start.
            gameScreens.Push(new LoadingScreen());
        }

        /// <summary>
        /// Create Racing game for unit tests, not used for anything else.
        /// </summary>
        public RacingGameManager(string unitTestName)
            : base(unitTestName)
        {
            // Don't add game screens here
        }

        /// <summary>
        /// Load car stuff
        /// </summary>
        protected override void Initialize()
        {
            base.Initialize();
        }

        /// <summary>
        /// Initializes and loads some content, previously referred to as the
        /// "car stuff".
        /// </summary>
        public static void LoadResources()
        {
            LoadEvent("Models...", null);
            // Load models
            carModel = new Model("Car");
            carSelectionPlate = new Model("CarSelectionPlate");

            LoadEvent("Landscape...", null);
            // Load landscape
            landscape = new Landscape(Level.Beginner);

            LoadEvent("Textures...", null);
            // Load textures, first one is grabbed from the imported one through
            // the car.x model, the other two are loaded seperately.
            carTextures = new Texture[3];
            carTextures[0] = new Texture("RacerCar");
            carTextures[1] = new Texture("RacerCar2");
            carTextures[2] = new Texture("RacerCar3");
            colorSelectionTexture = new Texture("ColorSelection");
            brakeTrackMaterial = new Material("Track");

            LoadEvent("All systems go!", null);
            Task.Delay(1000).Wait();
        }
        /// <summary>
        /// Add game screen
        /// </summary>
        /// <param name="gameScreen">Game screen</param>
        public static void AddGameScreen(IGameScreen gameScreen)
        {
            // Play sound for screen click
            Sound.Play(Sound.Sounds.ScreenClick);

            // Add the game screen
            gameScreens.Push(gameScreen);
        }
        /// <summary>
        /// Update
        /// </summary>
        protected override void Update(GameTime gameTime)
        {
            // Update game engine
            base.Update(gameTime);

            if (gameScreens.Count > 0)
            {
                if (gameScreens.Peek().GetType() != typeof(LoadingScreen))
                {
                    // Update player and game logic
                    player.Update();
                }

                //Update the game screen
                gameScreens.Peek().Update(gameTime);
            }
        }
        /// <summary>
        /// Render
        /// </summary>
        protected override void Render()
        {
            // No more game screens?
            if (gameScreens.Count == 0)
            {
                // Before quiting, stop music and play crash sound :)
                Sound.PlayCrashSound(true);
                Sound.StopMusic();

                // Then quit
                Exit();
                return;
            }

            // Handle current screen
            if (gameScreens.Peek().Render())
            {
                // If this was the options screen and the resolution has changed,
                // apply the changes
                if (gameScreens.Peek().GetType() == typeof(Options) &&
                    (BaseGame.Width != GameSettings.Default.ResolutionWidth ||
                    BaseGame.Height != GameSettings.Default.ResolutionHeight ||
                    BaseGame.Fullscreen != GameSettings.Default.Fullscreen))
                {
                    BaseGame.ApplyResolutionChange();
                }

                // Play sound for screen back
                Sound.Play(Sound.Sounds.ScreenBack);

                gameScreens.Pop();
            }
        }

        /// <summary>
        /// Post user interface rendering, in case we need it.
        /// Used for rendering the car selection 3d stuff after the UI.
        /// </summary>
        protected override void PostUIRender()
        {
            // Enable depth buffer again
            BaseGame.Device.DepthStencilState = DepthStencilState.Default;

            // Currently in car selection screen?
            if (gameScreens.Count > 0 &&
                gameScreens.Peek().GetType() == typeof(CarSelection))
                ((CarSelection)gameScreens.Peek()).PostUIRender();

            // Do menu shader after everything
            if (BaseGame.UsePostScreenShaders && PostScreenMenu.Started)
                UI.PostScreenMenuShader.Show();
        }
    }
}