using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;
using Microsoft.Xna.Framework.Net;
using Microsoft.Xna.Framework.Storage;
using CS_3505_Project_06.CS_3505;

namespace CS_3505_Project_06
{
    /// <summary>
    /// A game outline for testing network communications
    /// </summary>
    public class Game06 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        SpriteFont font;
        
        IDeterministicGame deterministicGame;
        TimeSpan targetTimeSpan;
        Object[] playerIdentifiers = { "One", "Two", "Three", "Four" };  // Any objects will do, strings are easy to debug.

        // For debugging

        List<Keys> lastPressedKeys;
        bool lastButtonPressed;
        Object activePlayer;
        bool paused;
        long lastAutoPause;

        // Constructor

        public Game06()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";

            // Make the game object.  The game is currently called 'testHarness'.

            deterministicGame = new TestHarness();
            
            // Debugging setup

            lastPressedKeys = new List<Keys>();
            activePlayer = playerIdentifiers[0];
            paused = false;
        }

        /// <summary>
        /// Allows the game to perform any initialization it needs to before starting to run.
        /// This is where it can query for any required services and load any non-graphic
        /// related content.  Calling base.Initialize will enumerate through any components
        /// and initialize them as well.
        /// </summary>
        protected override void Initialize()
        {
            // Set a fixed time span of 1/60th of a second.

            targetTimeSpan = new TimeSpan(166666); // In 100 nanosecond units = 16 666 600 nanoseconds
            IsFixedTimeStep = true;
            TargetElapsedTime = targetTimeSpan;

            // Reset the game - indicate that player #1 (player 0) owns this instance of the game.

            deterministicGame.ResetGame(playerIdentifiers, playerIdentifiers[0]);

            // For debugging - reset the mouse position to the center of the window.

            Mouse.SetPosition(400, 300);

            // Allow the base class to initialize.

            base.Initialize();
        }

        /// <summary>
        /// LoadContent will be called once per game and is the place to load
        /// all of your content.
        /// </summary>
        protected override void LoadContent()
        {
            // Create a new SpriteBatch, which can be used to draw textures.

            spriteBatch = new SpriteBatch(GraphicsDevice);

            // Let the game load its content.

            font = Content.Load<SpriteFont>("InstructionFont");

            deterministicGame.LoadContent(Content);
        }

        /// <summary>
        /// UnloadContent will be called once per game and is the place to unload
        /// all content.
        /// </summary>
        protected override void UnloadContent()
        {
            deterministicGame.UnloadContent();
        }

        /// <summary>
        /// Allows the game to run logic such as updating the world,
        /// checking for collisions, gathering input, and playing audio.
        /// </summary>
        /// <param name="gameTime">Provides a snapshot of timing values.</param>
        protected override void Update(GameTime gameTime)
        {
            // Get user's input state.

            KeyboardState keyState = Keyboard.GetState();
            MouseState mouseState = Mouse.GetState();

            // Make a list of the keys pressed or released this frame.

            List<Keys> pressedKeys = new List<Keys>();
            List<Keys> releasedKeys = new List<Keys>();

            Keys[] pressedKeysArray = keyState.GetPressedKeys();
            foreach (Keys k in pressedKeysArray)
                if (!lastPressedKeys.Contains(k))
                    pressedKeys.Add(k);
                else
                    lastPressedKeys.Remove(k);

            releasedKeys = lastPressedKeys;
            lastPressedKeys = new List<Keys>(pressedKeysArray);

            // Get mouse button state.

            bool buttonPressed = mouseState.LeftButton == ButtonState.Pressed;

            /***** Begining of game logic. *****/

            // Debug - allow user to exit.

            if (pressedKeys.Contains(Keys.Escape))
                this.Exit();

            // Debug - allow user on this machine to direct input to any player's state in the game.

            if (pressedKeys.Contains(Keys.F1)) activePlayer = playerIdentifiers[0];
            if (pressedKeys.Contains(Keys.F2)) activePlayer = playerIdentifiers[1];
            if (pressedKeys.Contains(Keys.F3)) activePlayer = playerIdentifiers[2];
            if (pressedKeys.Contains(Keys.F4)) activePlayer = playerIdentifiers[3];

            // Debug - allow user on this machine to pause/resume game state advances.

            if (pressedKeys.Contains(Keys.F12) ||
                pressedKeys.Contains(Keys.P) && (keyState.IsKeyDown(Keys.LeftControl) || keyState.IsKeyDown(Keys.RightControl)))
            {
                paused = !paused;
                return;  // Don't update on pause start or stop
            }

            // Debug - automatically pause every 1000 frames.

            if (deterministicGame.CurrentFrameNumber % 1000 == 0 && deterministicGame.CurrentFrameNumber != lastAutoPause)
            {
                paused = true;
                lastAutoPause = deterministicGame.CurrentFrameNumber;
            }

            // Game update

            // Direct inputs to the game engine - only report changes.

            foreach (Keys k in pressedKeys)
                deterministicGame.ApplyKeyInput(activePlayer, k, true);

            foreach (Keys k in releasedKeys)
                deterministicGame.ApplyKeyInput(activePlayer, k, false);

            deterministicGame.ApplyMouseLocationInput(activePlayer, mouseState.X, mouseState.Y);

            if (lastButtonPressed != buttonPressed)
                deterministicGame.ApplyMouseButtonInput(activePlayer, buttonPressed);

            lastButtonPressed = buttonPressed;

            if (!paused)
            {
                // Advance the game engine.

                deterministicGame.Update(targetTimeSpan);
            }

            /***** End of game logic. *****/

            // Allow the superclass to do any needed updates (unknown purpose).

            base.Update(gameTime);
        }

        /// <summary>
        /// This is called when the game should draw itself.
        /// </summary>
        /// <param name="gameTime">Provides a snapshot of timing values.</param>
        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(new Color(16, 16, 16, 255));  // Needed by the test harness, should be removed for the real game.

            spriteBatch.Begin();

            // Draw a few instructions.

            if (paused && gameTime.TotalRealTime.Milliseconds < 500)
                spriteBatch.DrawString(font, "-=> Paused <=-", new Vector2(10, 130), Color.White);

            spriteBatch.DrawString(font, "Press [F1]...[F4] to simulate input for each player.  Click X's to end game or terminate player.", new Vector2(10, 540), Color.White);
            spriteBatch.DrawString(font, "Press [ESC] to exit and [F12] to pause/unpause.  Game auto-pauses every 1000 frames.", new Vector2(10, 570), Color.White);

            // Let the game draw itself.

            deterministicGame.Draw(spriteBatch);
            

            spriteBatch.End();

            base.Draw(gameTime);
        }
    }
}