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;
using Penguloon.Levels;

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

    public enum UpgradeState
    {
        Idle,
        Pressed,
    }

    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; }
        public UpgradeState State { get; set; } = UpgradeState.Idle;

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

        public LevelBase ParentLevel { get; set; }

        public ObjectUpgrade(int Cost, UpgradeType Type, string Text, ObjectUpgrade NextUgrade, LevelBase parentLevel)
        {
            // something is fucked up in staticUiValues.IngameUIWidth but we can workaround that issue with this line
            StaticUIValues.UpgradePanelSize = new Vector2(
                StaticUIValues.ScreenViewport.X - parentLevel.Map.MapWidth,
                StaticUIValues.UpgradePanelSize.Y);

            this.Cost = Cost;
            this.Type = Type;
            this.Text = Text;
            this.NextUgrade = NextUgrade;
            this.ParentLevel = parentLevel;

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

            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;
                case UpgradeType.Range: Icon = ContentManager.GetTexture("UI/radar"); 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;
            int textWidth = (int)font.MeasureString(Text).X;

            int costHeight = (int)font.MeasureString("$" + Cost.ToString() + ",-").Y;
            int costWidth = (int)font.MeasureString("$" + Cost.ToString() + ",-").X;

            if (State == UpgradeState.Idle)
            spriteBatch.Draw(Background, destinationRectangle: new Rectangle(
                ParentLevel.Map.MapWidth + StaticUIValues.BorderWidth,
                startY + (int)StaticUIValues.UpgradePanelSize.Y * index, 
                (int)StaticUIValues.UpgradePanelSize.X,
                (int)StaticUIValues.UpgradePanelSize.Y));
            else
            spriteBatch.Draw(BackgroundPressed, destinationRectangle: new Rectangle(
               ParentLevel.Map.MapWidth + StaticUIValues.BorderWidth,
               startY + (int)StaticUIValues.UpgradePanelSize.Y * index,
               (int)StaticUIValues.UpgradePanelSize.X,
               (int)StaticUIValues.UpgradePanelSize.Y));

            spriteBatch.Draw(Icon, destinationRectangle: new Rectangle(
                ParentLevel.Map.MapWidth + StaticUIValues.BorderWidth + 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(StaticUIValues.ScreenViewport.X - 20 - textWidth,
                startY + ((int)StaticUIValues.UpgradePanelSize.Y * index) + (int)(StaticUIValues.UpgradePanelSize.Y / 3) - textHeight / 2),
                Color.FromNonPremultiplied(20, 20, 20, 255));

            spriteBatch.DrawString(ContentManager.GetFont(StaticUIValues.IngameFont),
                "$" + Cost.ToString() + ",-", new Vector2(StaticUIValues.ScreenViewport.X - 20 - costWidth,
                startY + ((int)StaticUIValues.UpgradePanelSize.Y * index) + (int)(StaticUIValues.UpgradePanelSize.Y / 2) + (int)(StaticUIValues.UpgradePanelSize.Y / 4) - costHeight / 2),
                Color.FromNonPremultiplied(20, 20, 20, 255));

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