using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Penguloon.Scenes;
using System;

namespace Penguloon.Controls
{
    public static class Alert
    {
        static Texture2D background;

        private static bool active = false;

        private static float posY = 0f;

        private static string text_;

        private const int maxY = 50;

        private const int speed = 3000;

        private static float posX = 0;

        private static SceneBase scene_;

        private static bool movingUp = false;
        private static bool bottomReached = false;
        private static DateTime bottomReachedTime;

        private static int displayTimeMS_ = 0;

        private static SpriteFont font;

        public static void Show(string text, int displayTimeMS, SceneBase scene)
        {
            text_ = text;
            scene_ = scene;
            displayTimeMS_ = displayTimeMS;

            font = ContentManager.GetFont(StaticUIValues.MenuFont);
            posX = (StaticUIValues.ScreenViewport.X / 2) - (StaticUIValues.AlertSize.X / 2);
            background = ContentManager.GetTexture("UI/alertBackground");
            posY = -StaticUIValues.AlertSize.Y;

            active = true;
        }

        public static void Draw(float deltaTime)
        {
            if (!active) return;

            scene_.Main.SpriteBatch.Draw(background, destinationRectangle:
                new Microsoft.Xna.Framework.Rectangle((int)posX, (int)posY, (int)StaticUIValues.AlertSize.X, (int)StaticUIValues.AlertSize.Y));

            scene_.DrawText(font, text_, new Vector2(posX, posY), StaticUIValues.AlertSize,
                TextAllignment.CenterMiddle, Color.White, Color.Black, 2);
        }

        public static void Update(float deltaTime)
        {
            if (!active) return;

            if (movingUp)
            {
                posY -= (speed * deltaTime);

                // we done here
                if (posY < -StaticUIValues.AlertSize.Y)
                {
                    movingUp = false;
                    bottomReached = false;
                    active = false;
                }

                return;
            }

            if (bottomReached)
            {
                if ((DateTime.Now - bottomReachedTime).TotalMilliseconds > displayTimeMS_)
                {
                    movingUp = true;
                }

                return;
            }

            if (posY < maxY)
            {
                posY += (speed * deltaTime);
            }
            else
            {
                bottomReachedTime = DateTime.Now;
                bottomReached = true;
            }
        }
    }
}