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

using Microsoft.Xna.Framework;

namespace TalkingIsAFreeAction
{
    public static class Util
    {
        public static bool CheckCollision(float x1, float y1, float w1, float h1, float x2, float y2, float w2, float h2)
        {
            if (x1 + w1 > x2)
            {
                if (x2 + w2 > x1)
                {
                    if (y1 + h1 > y2)
                    {
                        if (y2 + h2 > y1)
                        {
                            return true;
                        }
                    }
                }
            }
            return false;
        }

        public static bool CheckCollision(PhysicsObject one, PhysicsObject two)
        {
            return CheckCollision(one.x, one.y, one.width, one.height, two.x, two.y, two.width, two.height);
        }

        public static string[] FileToStringArray(string filename)
        {
            List<string> toReturn = new List<string>();

            StreamReader sr = new StreamReader(filename);
            while(!sr.EndOfStream) toReturn.Add(sr.ReadLine());

            return toReturn.ToArray();
        }

        public static string ReadStringAfterEquals(string source)
        {
            return source.Substring(source.IndexOf("=") + 1);
        }

        public static int ReadIntAfterEquals(string source)
        {
            return Convert.ToInt32(source.Substring(source.IndexOf("=") + 1));
        }

        public static string ReadStringBeforeEquals(string source)
        {
            return source.Substring(0, source.IndexOf("="));
        }

        public static Vector2 CalculateCollision(float redX, float redY, float redWidth, float redHeight, float blueX, float blueY, float blueWidth, float blueHeight)
        {
            float redHalfSizeX = redWidth / 2f;
            float redHalfSizeY = redHeight / 2f;
            float blueHalfSizeX = blueWidth / 2f;
            float blueHalfSizeY = blueHeight / 2f;

            //Horizontal
            float redCenterX = redX + redHalfSizeX;
            float blueCenterX = blueX + blueHalfSizeX;

            float greenLineX = 0;

            if (blueCenterX > redCenterX) { greenLineX = (blueCenterX) - (redCenterX); }
            else { greenLineX = (redCenterX) - (blueCenterX); }

            float totalVectorX = (redHalfSizeX + blueHalfSizeX) - (greenLineX);

            //Vertical
            float redCenterY = redY + redHalfSizeY;
            float blueCenterY = blueY + blueHalfSizeY;

            float greenLineY = 0;

            if (blueCenterY > redCenterY) { greenLineY = (blueCenterY) - (redCenterY); }
            else { greenLineY = (redCenterY) - (blueCenterY); }

            float totalVectorY = (redHalfSizeY + blueHalfSizeY) - (greenLineY);

            return new Vector2(totalVectorX, totalVectorY);
        }
    }
}