using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Media;
using System;
using System.Collections.Generic;

namespace LunaLightXMG
{
    public class Game1 : Game
    {
        // Class Objects
        private Player player;
        private PlayerInput playerInput;
        private List<Enemy> enemies;
        private GraphicsDeviceManager graphics;
        private SpriteBatch spriteBatch;

        // Native retro scale
        private int retroWidth = 320;
        private int retroHeight = 180;

        // Test Render Target
        private RenderTarget2D renderTarget;
        private Rectangle renderDestination;
        bool resizing;

        // Test sprites - eventually handle in a sprite manager?
        private Texture2D platformTexture;

        // Test platforms
        private Platform[] platforms;

        // Music
        private SoundEffect sinkBeats;
        private SoundEffectInstance backgroundMusicInstance;

        // Debugging
        private SpriteFont debugFont;
        private Texture2D debugGrid;

        // Utility
        private static Random random; 

        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
            IsMouseVisible = true;

            Window.ClientSizeChanged += OnClientSizeChanged;
            Window.AllowUserResizing = true;
            IsMouseVisible = true;

            // Test player input and movement with abstracted player class
            Vector2 initPlayerPosition = new Vector2(163, 63);
            Vector2 initEnemyPosition = new Vector2(16, 16);
            player = new Player(initPlayerPosition);
            playerInput = new PlayerInput();
            enemies = new List<Enemy>();

            random = new Random(42);
        }

        private void OnClientSizeChanged(object sender, EventArgs eventArgs)
        {
            if (!resizing && Window.ClientBounds.Width > 0 && Window.ClientBounds.Height > 0)
            {
                resizing = true;
                CalculateRenderDestination();
                resizing = false;
            }
        }

        protected override void Initialize()
        {
            // Set initial window size
            graphics.PreferredBackBufferWidth = 1920;
            graphics.PreferredBackBufferHeight = 1080;
            graphics.ApplyChanges();

            playerInput.HasControl = true; // May need to find a new home for this

            base.Initialize();
            CalculateRenderDestination();
            // Play music
            PlayBackgroundMusic(sinkBeats);

            // Test initialize platforms -- this should be abstracted to a class
            // Also, I'm assuming using a tool like tiled will prevent having to
            // manually input platforms like below...
            platforms = new Platform[]
            {
                // platforms
                new Platform(new Vector2(48, 128), 16, 16),
                new Platform(new Vector2(64, 128), 16, 16),
                new Platform(new Vector2(96, 96), 16, 16),
                new Platform(new Vector2(112, 96), 16, 16),
                new Platform(new Vector2(192, 128), 16, 16),
                new Platform(new Vector2(208, 128), 16, 16),
                new Platform(new Vector2(240, 96), 16, 16),
                new Platform(new Vector2(256, 96), 16, 16),
                new Platform(new Vector2(192, 64), 16, 16),
                new Platform(new Vector2(208, 64), 16, 16),
                new Platform(new Vector2(144, 32), 16, 16),
                new Platform(new Vector2(160, 32), 16, 16),
                new Platform(new Vector2(288, 128), 16, 16),
                new Platform(new Vector2(16, 96), 16, 16),

                // bottom
                new Platform(new Vector2(16, 160), 16, 16),
                new Platform(new Vector2(32, 160), 16, 16),
                new Platform(new Vector2(48, 160), 16, 16),
                new Platform(new Vector2(64, 160), 16, 16),
                new Platform(new Vector2(80, 160), 16, 16),
                new Platform(new Vector2(96, 160), 16, 16),
                new Platform(new Vector2(112, 160), 16, 16),
                new Platform(new Vector2(128, 160), 16, 16),
                new Platform(new Vector2(144, 160), 16, 16),
                new Platform(new Vector2(160, 160), 16, 16),
                new Platform(new Vector2(176, 160), 16, 16),
                new Platform(new Vector2(192, 160), 16, 16),
                new Platform(new Vector2(208, 160), 16, 16),
                new Platform(new Vector2(224, 160), 16, 16),
                new Platform(new Vector2(240, 160), 16, 16),
                new Platform(new Vector2(256, 160), 16, 16),
                new Platform(new Vector2(272, 160), 16, 16),
                new Platform(new Vector2(288, 160), 16, 16),

                // left side
                new Platform(new Vector2(0, 0), 16, 16),
                new Platform(new Vector2(0, 16), 16, 16),
                new Platform(new Vector2(0, 32), 16, 16),
                new Platform(new Vector2(0, 48), 16, 16),
                new Platform(new Vector2(0, 64), 16, 16),
                new Platform(new Vector2(0, 80), 16, 16),
                new Platform(new Vector2(0, 96), 16, 16),
                new Platform(new Vector2(0, 112), 16, 16),
                new Platform(new Vector2(0, 128), 16, 16),
                new Platform(new Vector2(0, 144), 16, 16),

                // right side
                new Platform(new Vector2(304, 0), 16, 16),
                new Platform(new Vector2(304, 16), 16, 16),
                new Platform(new Vector2(304, 32), 16, 16),
                new Platform(new Vector2(304, 48), 16, 16),
                new Platform(new Vector2(304, 64), 16, 16),
                new Platform(new Vector2(304, 80), 16, 16),
                new Platform(new Vector2(304, 96), 16, 16),
                new Platform(new Vector2(304, 112), 16, 16),
                new Platform(new Vector2(304, 128), 16, 16),
                new Platform(new Vector2(304, 144), 16, 16)
            };
        }

     
        protected override void LoadContent()
        {
            spriteBatch = new SpriteBatch(GraphicsDevice);

            // Test platform
            platformTexture = Content.Load<Texture2D>("platform");
            // Music
            sinkBeats = Content.Load<SoundEffect>("music/sinkBeats");
            // load player sprite
            player.LoadContent(Content);  // player sprite is now handled in player.cs

            // Spawn 10 enemies at the start of the level
            for (int i = 0; i < 10; i++)
            {
                Vector2 spawnPosition = new Vector2(16 + i*3,16);
                Enemy enemy = new Enemy(spawnPosition, GetRandomValueBetween1And3());
                enemy.LoadContent(Content);
                enemies.Add(enemy);
            }

            // Test Render Target
            renderTarget = new RenderTarget2D(GraphicsDevice, retroWidth, retroHeight);

            // Debugging
            debugFont = Content.Load<SpriteFont>("fonts/debugFont");
            debugGrid = Content.Load<Texture2D>("debugGrid");
        }

        protected override void Update(GameTime gameTime)
        {
            // Temporary quit game - eventually handle in a pause menu class
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
                Exit();

            // Test player input and movement with abstracted player class
            playerInput.Update();
            player.Update(gameTime, playerInput, platforms);

            foreach (var enemy in enemies) {
                enemy.Update(gameTime, player, platforms);
            }

            base.Update(gameTime);
        }

        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);

            // Test Render Target - Draw sprites to the render target
            GraphicsDevice.SetRenderTarget(renderTarget);

            // Test Sprite
            spriteBatch.Begin(samplerState: SamplerState.PointClamp);
            // Debug Grid
            spriteBatch.Draw(debugGrid, new Vector2(0, 0), Color.Blue);

            // Test draw tiles
            foreach (var platform in platforms)
            {
                platform.Draw(spriteBatch, platformTexture); // Assuming all tiles use the same texture for now
            }

            // Test player input and movement with abstracted player class
            player.Draw(spriteBatch);

            foreach (var enemy in enemies)
            {
                enemy.Draw(spriteBatch);
            }

            spriteBatch.End();


            // Test Render Target - Draw render target to the screen
            GraphicsDevice.SetRenderTarget(null);
            spriteBatch.Begin(samplerState: SamplerState.PointClamp);
            spriteBatch.Draw(renderTarget, renderDestination, Color.White);
            spriteBatch.End();

            // Debugging
            DrawDebugInfo();

            base.Draw(gameTime);
        }

        // Method Implementation -------------------------------------------------------------------------------
        private void PlayBackgroundMusic(SoundEffect backgroundMusic)
        {
            if (backgroundMusicInstance == null || backgroundMusicInstance.State != SoundState.Playing)
            {
                if (backgroundMusicInstance != null)
                {
                    backgroundMusicInstance.Dispose();
                }

                backgroundMusicInstance = backgroundMusic.CreateInstance();
                backgroundMusicInstance.IsLooped = true;
                backgroundMusicInstance.Play();
            }
        }

        private void CalculateRenderDestination()  
        {
            Point size = GraphicsDevice.Viewport.Bounds.Size;

            // Calculate the integer scale factor
            int scaleX = size.X / renderTarget.Width;
            int scaleY = size.Y / renderTarget.Height;
            int scale = Math.Min(scaleX, scaleY);

            // Ensure the scale is at least 1
            scale = Math.Max(scale, 1);

            // Set renderDestination 
            renderDestination.Width = (int)(renderTarget.Width * scale);
            renderDestination.Height = (int)(renderTarget.Height * scale);

            renderDestination.X = (size.X - renderDestination.Width) / 2;
            renderDestination.Y = (size.Y - renderDestination.Height) / 2;
        }
        
        private void DrawDebugInfo()
        {
            spriteBatch.Begin();

            // Draw debug messages
            spriteBatch.DrawString(debugFont, $"VSP: {player.vsp}", new Vector2(10, 10), Color.White);
            spriteBatch.DrawString(debugFont, $"Grounded: {player.grounded}", new Vector2(10, 30), Color.White);
            spriteBatch.DrawString(debugFont, $"Walled: {player.walled}", new Vector2(10, 50), Color.White);
            spriteBatch.DrawString(debugFont, $"Position: {player.position}", new Vector2(10, 70), Color.White);

            spriteBatch.End();
        }

        public static float GetRandomValueBetween1And3()
        {
            return (float)(1 + 2 * random.NextDouble());
        }
    }
}