using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework;

namespace Penguloon.Objects
{
    public enum UpgradeType
    {
        Health,
        PopCount,
        Speed,
        Money,
    }

    public class ObjectUpgrade
    {
        public int Cost { get; set; }
        public ObjectUpgrade NextUgrade { get; set; }
        public event EventHandler OnClick;
        public UpgradeType Type { get; set; }
        public string Text { get; set; }

        private Texture2D Background { get; set; }
        private Texture2D Icon { get; set; }

        public ObjectUpgrade(int Cost, UpgradeType Type, string Text, ObjectUpgrade NextUgrade)
        {
            this.Cost = Cost;
            this.Type = Type;
            this.Text = Text;
            this.NextUgrade = NextUgrade;

            Background = ContentManager.GetTexture("UI/lightred");

            switch (Type)
            {
                case UpgradeType.Health: Icon = ContentManager.GetTexture("UI/heart"); break;
                case UpgradeType.Money: Icon = ContentManager.GetTexture("UI/money"); break;
                case UpgradeType.PopCount: Icon = ContentManager.GetTexture("UI/explosion"); break;
                case UpgradeType.Speed: Icon = ContentManager.GetTexture("UI/speed"); break;
            }
        }

        public void Click()
        {
            OnClick?.Invoke(this, EventArgs.Empty);
        }

        internal void Draw(SpriteBatch spriteBatch, int index)
        {
            int startY = StaticUIValues.IngameUITextAreaHeight + StaticUIValues.BorderWidth;

            SpriteFont font = ContentManager.GetFont(StaticUIValues.IngameFont);
            int textHeight = (int)font.MeasureString(Text).Y;

            spriteBatch.Draw(Background, destinationRectangle: new Rectangle(
                (int)StaticUIValues.ScreenViewport.X - StaticUIValues.IngameUIWidth,
                startY + (int)StaticUIValues.UpgradePanelSize.Y * index, 
                (int)StaticUIValues.UpgradePanelSize.X,
                (int)StaticUIValues.UpgradePanelSize.Y));

            spriteBatch.Draw(Icon, destinationRectangle: new Rectangle(
                (int)StaticUIValues.ScreenViewport.X - StaticUIValues.IngameUIWidth + 20,
                startY + ((int)StaticUIValues.UpgradePanelSize.Y * index) + (int)(StaticUIValues.UpgradePanelSize.Y / 4),
                (int)StaticUIValues.UpgradePanelSize.Y / 2,
                (int)StaticUIValues.UpgradePanelSize.Y / 2));

            spriteBatch.DrawString(ContentManager.GetFont(StaticUIValues.IngameFont),
                Text, new Vector2((int)StaticUIValues.ScreenViewport.X - StaticUIValues.IngameUIWidth + 90,
                startY + ((int)StaticUIValues.UpgradePanelSize.Y * index) + (int)(StaticUIValues.UpgradePanelSize.Y / 2) - textHeight / 2),
                Color.FromNonPremultiplied(20, 20, 20, 255));

            spriteBatch.Draw(ContentManager.GetTexture("UI/objectSelectionBorder"),
                destinationRectangle: new Rectangle(
                (int)StaticUIValues.ScreenViewport.X - StaticUIValues.IngameUIWidth,
                startY + (int)StaticUIValues.UpgradePanelSize.Y * index + (int)StaticUIValues.UpgradePanelSize.Y - 2,
                (int)StaticUIValues.UpgradePanelSize.X,
                2));
        }
    }
}