using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace VPet_Simulator.Tool
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("VPet Simulator Tool");
        start:
            Console.WriteLine("请输入需要使用的功能编号");
            Console.WriteLine("1. 精简动画相同图片");
            switch (Console.ReadLine())
            {
                case "1":
                    do
                    {
                        Animation();
                    } while (true);
                default:
                    Console.WriteLine("暂无该功能");
                    goto start;
            }
        }
        /// <summary>
        /// 将图片重命名并转换成 名字_序号_持续时间 格式
        /// </summary>
        static void Animation()
        {
            Console.WriteLine("请输入每张图片的持续时间 (单位: 毫秒)");
            string timestr = Console.ReadLine();
            int time = timestr == "" ? 125 : int.Parse(timestr);
            Console.WriteLine("请输入图片位置");
            DirectoryInfo directoryInfo = new DirectoryInfo(Console.ReadLine());
            int id = 0;
            int rpt = 1;
            string hash = null;
            FileInfo lastf = null;
            foreach (FileInfo fileInfo in directoryInfo.GetFiles())
            {
                if (lastf == null)
                {
                    lastf = fileInfo;
                    hash = GetFileHash(fileInfo);
                    continue;
                }
                string filehash = GetFileHash(fileInfo);
                if (hash.Equals(filehash))
                {
                    //这个文件和上一个文件的hash值相同，这个上个文件
                    lastf.Delete();
                    lastf = fileInfo;
                    rpt++;
                    continue;
                }
                hash = filehash;
                lastf.MoveTo(Path.Combine(directoryInfo.FullName, $"{lastf.Name.Split('_')[0]}_{id++:D3}_{rpt * time}.png"));
                rpt = 1;
                lastf = fileInfo;
            }
            lastf.MoveTo(Path.Combine(directoryInfo.FullName, $"{lastf.Name.Split('_')[0]}_{id++:D3}_{rpt * time}.png"));
            Console.WriteLine("图片处理已完成");
        }
        public static string GetFileHash(FileInfo fileInfo)
        {
            //创建一个哈希算法对象
            using (HashAlgorithm hash = HashAlgorithm.Create())
            {
                using (FileStream file = fileInfo.OpenRead())
                {
                    //哈希算法根据文本得到哈希码的字节数组                
                    return BitConverter.ToString(hash.ComputeHash(file));
                }
            }
        }

    }
}