using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing;
using System.IO;

namespace SheetPlayer {
    public class animationObject : ICloneable {
        //srcData
        private string srcPath;
        private long lastModificTime = 0;
        public string metaData = "48f1";
        public Point position;
        public int size = 1;

        //precalculatedData
        public Bitmap spriteSheet;
        private List<Rectangle> animationFrames = new List<Rectangle>();

        public Rectangle currentFrame {
            get {
                if (animationFrames.Count != 0)
                    return animationFrames[mainForm.globalFrameCounter % animationFrames.Count];
                else
                    return new Rectangle(0, 0, 48, 48);
            }
        }

        public animationObject(string draggedImage, Point dropPosition) {
            srcPath = draggedImage;
            checkForModification();
            updateMetaData();
            position = dropPosition;
        }

        public object Clone() {
            return this.MemberwiseClone();
        }

        public void checkForModification() {
            try { 
                long currentModificTime = File.GetLastWriteTime(srcPath).Ticks;
                if (lastModificTime != currentModificTime) {
                    var binary = File.ReadAllBytes(srcPath);
                    var memoryStream = new MemoryStream(binary);
                    spriteSheet = (Bitmap)Image.FromStream(memoryStream);
                    lastModificTime = currentModificTime;
                }
            }
            catch { }
        }

        public bool updateMetaData() {
            try {
                animationFrames.Clear();
                string[] headerAndBody = metaData.Split('f');
                string[] header = headerAndBody[0].Split('x');
                int width = Convert.ToInt32(header[0]);
                int height = header.Length > 1 ? Convert.ToInt32(header[1]) : Convert.ToInt32(header[0]);
                int hFrames = spriteSheet.Width / width;
                int vFrames = spriteSheet.Height / height;
                string[] frameList = headerAndBody[1].Split('.');
                foreach (string frame in frameList) {
                    string[] range = frame.Split(':');
                    if (range.Length == 1) { 
                        int frameNumber = Convert.ToInt32(frame);
                        animationFrames.Add(new Rectangle(
                            frameNumber % hFrames * width,
                            frameNumber / hFrames * height,
                            width, height));
                    }
                    else {
                        int rangeBegin = Convert.ToInt32(range[0]);
                        int rangeEnd = Convert.ToInt32(range[1]);
                        for (int frameNumber = rangeBegin;
                                frameNumber <= Math.Max(rangeBegin, rangeEnd) &&
                                frameNumber >= Math.Min(rangeBegin, rangeEnd);
                                frameNumber += rangeEnd > rangeBegin ? 1 : -1) {
                            animationFrames.Add(new Rectangle(
                            frameNumber % hFrames * width,
                            frameNumber / hFrames * height,
                            width, height));
                        }
                    }
                }
            }
            catch {
                return false;
            }
            return true;
        }
    }
}