using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace lobbyTest
{
    public class lobbyGUI
    {
        Texture2D background;
        Texture2D spotLight;
        Texture2D cs;
        Texture2D selectGameScreen;

        Vector2 backgroundPos;
        Vector2 spotLightPos;
        Vector2 spotLightCenter;
        Vector2 csPos;

        Vector2 zero;
        Vector2 spotLightVelocity;

        int MaxX;
        int MinX;
        int MaxY;
        int MinY;

        SpriteFont menuFont;
        string selected;
        Vector2 createGamePos;
        string createGameText;
        Vector2 findGamePos;
        string findGameText;

        Vector2 returnToMainPos;
        string returnToMainText;

        KeyboardState previousKeyboardState;
        KeyboardState currentKeyboardState;

        private enum lobbyState
        {
            Welcome,
            CreateGame,
            FindGame,
            Connected
        }

        lobbyState currentState;

        public lobbyGUI()
        {
            currentState = lobbyState.Welcome;
        }

        public void LoadContent(ContentManager contentManager, GraphicsDeviceManager graphics)
        {
            background = contentManager.Load<Texture2D>("background");
            spotLight = contentManager.Load<Texture2D>("spotlight");
            cs = contentManager.Load<Texture2D>("cs");
            selectGameScreen = contentManager.Load<Texture2D>("selectGameScreen");
            backgroundPos = new Vector2(0f, 0f);
            spotLightPos = new Vector2(100f, graphics.GraphicsDevice.Viewport.Height - 98);
            spotLightCenter = new Vector2(800f, 800f);
            spotLightVelocity = new Vector2(-100, 33);
            csPos = new Vector2(10f, graphics.GraphicsDevice.Viewport.Height - 98);

            zero = new Vector2(0, 0);

            MaxX = graphics.GraphicsDevice.Viewport.Width;
            MinX = 0;
            MaxY = graphics.GraphicsDevice.Viewport.Height;
            MinY = 100;

            //menu fonts
            menuFont = contentManager.Load<SpriteFont>("menuFont");
            createGamePos = new Vector2(100f, MaxY / 3);
            createGameText = "Create Game";
            selected = createGameText;

            findGamePos = new Vector2(100f, (MaxY / 3) + 60);
            findGameText = "Find Game";

            returnToMainPos = new Vector2(MaxX / 2, MaxY - 120);
            returnToMainText = "press [ X ] to return to main menu";
        }

        public void UnloadContent()
        {
            
        }

        public long Update(GameTime gameTime)
        {
            UpdateSpotLight(gameTime);
            currentKeyboardState = Keyboard.GetState();
            //check inputs
            switch (currentState)
            {
                case lobbyState.Welcome:
                    if (selected == createGameText)
                    {
                        if (currentKeyboardState.IsKeyDown(Keys.Enter) && previousKeyboardState.IsKeyUp(Keys.Enter))
                            currentState = lobbyState.CreateGame;
                        if (currentKeyboardState.IsKeyDown(Keys.Down))
                            selected = findGameText;
                    }
                    else
                    {
                        if (currentKeyboardState.IsKeyDown(Keys.Enter) && previousKeyboardState.IsKeyUp(Keys.Enter))
                            currentState = lobbyState.FindGame;
                        if (currentKeyboardState.IsKeyDown(Keys.Up))
                            selected = createGameText;
                    }
                    break;
                case lobbyState.CreateGame:
                    if (currentKeyboardState.IsKeyDown(Keys.X) && previousKeyboardState.IsKeyUp(Keys.X))
                        currentState = lobbyState.Welcome;

                    break;
                case lobbyState.FindGame:
                    if (currentKeyboardState.IsKeyDown(Keys.X) && previousKeyboardState.IsKeyUp(Keys.X))
                        currentState = lobbyState.Welcome;

                    break;
                case lobbyState.Connected:
                    if (currentKeyboardState.IsKeyDown(Keys.X) && previousKeyboardState.IsKeyUp(Keys.X))
                        currentState = lobbyState.Welcome;

                    break;

            }
            previousKeyboardState = Keyboard.GetState();

            return 1;
        }

        /// <summary>
        /// Draws the lobby GUI. Has different states for difference menu configurations
        /// </summary>
        public long Draw(SpriteBatch spriteBatch)
        {
            spriteBatch.Draw(background, backgroundPos, null, Color.White, 0, zero, 0.5f, SpriteEffects.None, 0);
            spriteBatch.Draw(cs, csPos, null, Color.White, 0, zero, 0.5f, SpriteEffects.None, 0);
            spriteBatch.Draw(spotLight, spotLightPos, null, Color.White, 0, spotLightCenter, 1f, SpriteEffects.None, 0);
            switch (currentState)
            {
                case lobbyState.Welcome:
                    if (selected == createGameText)
                        spriteBatch.DrawString(menuFont, createGameText, createGamePos, Color.Red, 0, zero, 1f, SpriteEffects.None, 0.5f);
                    else
                        spriteBatch.DrawString(menuFont, createGameText, createGamePos, Color.Gray, 0, zero, 1f,SpriteEffects.None, 0.5f);
                    if (selected == findGameText)
                        spriteBatch.DrawString(menuFont, findGameText, findGamePos, Color.Red, 0, zero, 1f, SpriteEffects.None, 0.5f);
                    else
                        spriteBatch.DrawString(menuFont, findGameText, findGamePos, Color.Gray, 0, zero, 1f, SpriteEffects.None, 0.5f);
                    break;
                
                case lobbyState.CreateGame:
                    
                    break;
                case lobbyState.FindGame:
                    spriteBatch.Draw(selectGameScreen, backgroundPos, null, Color.White, 0, zero, 0.5f, SpriteEffects.None, 0);
                    //spriteBatch.DrawString(menuFont, "Select Game", new Vector2(100, 100), Color.Gray, 0, zero, 1f, SpriteEffects.None, 0.5f);

                    //spriteBatch.DrawString(menuFont, returnToMainText, returnToMainPos, Color.Gray, 0, new Vector2(180 , 0), .6f, SpriteEffects.None, 0.5f);
                    break;
                case lobbyState.Connected:
                    
                    break;
            }

            return 1;
        }

        private void UpdateSpotLight(GameTime gameTime)
        {
            spotLightPos = new Vector2(spotLightPos.X + spotLightVelocity.X * (float)gameTime.ElapsedGameTime.TotalSeconds,
                                        spotLightPos.Y + spotLightVelocity.Y * (float)gameTime.ElapsedGameTime.TotalSeconds);

            if (spotLightPos.X > MaxX || spotLightPos.X < MinX) //right or left wall
            {
                spotLightVelocity = new Vector2(spotLightVelocity.X * -1, spotLightVelocity.Y);
            }
            else if (spotLightPos.Y > MaxY || spotLightPos.Y < MinY) //top or bottom wall
            {
                spotLightVelocity = new Vector2(spotLightVelocity.X, spotLightVelocity.Y * -1);
            }
        }
    }
}