using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows;
using static System.Net.WebRequestMethods;
using System.Windows.Threading;
using System.Threading;

namespace VPet_Simulator.Core
{
    /// <summary>
    /// PNGAnimation.xaml 的交互逻辑
    /// </summary>
    public partial class PNGAnimation : UserControl, IGraph
    {
        /// <summary>
        /// 所有动画帧
        /// </summary>
        public List<Animation> Animations;
        /// <summary>
        /// 当前动画播放状态
        /// </summary>
        public bool PlayState { get; set; } = false;
        /// <summary>
        /// 当前动画是否执行ENDACTION
        /// </summary>
        private bool DoEndAction = true;
        /// <summary>
        /// 是否循环播放
        /// </summary>
        public bool IsLoop { get; set; }
        /// <summary>
        /// 是否循环播放
        /// </summary>
        public bool IsContinue { get; set; } = false;
        /// <summary>
        /// 是否储存到内存以支持快速显示
        /// </summary>
        public bool StoreMemory { get; private set; }
        public UIElement This => this;

        public Save.ModeType ModeType { get; private set; }

        public GraphCore.GraphType GraphType { get; private set; }

        //private Action endwilldo;
        int nowid;
        /// <summary>
        /// 新建 PNG 动画
        /// </summary>
        /// <param name="paths">文件夹位置</param>
        /// <param name="isLoop">是否循环</param>
        /// <param name="storemem">是否储存到内存以支持快速显示</param>
        public PNGAnimation(FileInfo[] paths, Save.ModeType modetype, GraphCore.GraphType graphtype, bool storemem = false, bool isLoop = false)
        {
            InitializeComponent();
            Animations = new List<Animation>();
            IsLoop = isLoop;
            StoreMemory = storemem;
            GraphType = graphtype;
            ModeType = modetype;
            if (storemem)
                foreach (var file in paths)
                {
                    int time = int.Parse(file.Name.Split('.').Reverse().ToArray()[1].Split('_').Last());
                    var img = new Image()
                    {
                        Source = new BitmapImage(new Uri(file.FullName)),
                        Visibility = Visibility.Hidden
                    };
                    MainGrid.Children.Add(img);
                    Animations.Add(new Animation(this, time, () =>
                    {
                        img.Visibility = Visibility.Visible;
                    }, () => img.Visibility = Visibility.Hidden));
                }
            else
            {
                Image[] imgs = new Image[3];
                imgs[0] = new Image()
                {
                    Visibility = Visibility.Hidden
                };
                imgs[1] = new Image()
                {
                    Visibility = Visibility.Hidden
                };
                imgs[2] = new Image()
                {
                    Visibility = Visibility.Hidden
                };
                int time = int.Parse(paths[0].Name.Split('.').Reverse().ToArray()[1].Split('_').Last());
                //第一张图:有专门自己的图层
                var img = new Image()
                {
                    Source = new BitmapImage(new Uri(paths[0].FullName)),
                    Visibility = Visibility.Hidden
                };
                MainGrid.Children.Add(img);
                MainGrid.Children.Add(imgs[0]);
                MainGrid.Children.Add(imgs[1]);
                MainGrid.Children.Add(imgs[2]);
                Animations.Add(new Animation(this, time, () =>
                {
                    img.Visibility = Visibility.Visible;
                    imgs[1].Source = new BitmapImage(new Uri(paths[1].FullName));
                }, () => img.Visibility = Visibility.Hidden));

                int last = paths.Count() - 1;
                for (int i = 1; i < last; i++)
                {
                    time = int.Parse(paths[i].Name.Split('.').Reverse().ToArray()[1].Split('_').Last());
                    var im1 = imgs[i % 3];
                    var im2 = imgs[(i + 1) % 3];
                    var st3 = paths[i + 1].FullName;
                    Animations.Add(new Animation(this, time, () =>
                    {
                        im1.Visibility = Visibility.Visible;
                        im2.Source = new BitmapImage(new Uri(st3));
                    }, () => im1.Visibility = Visibility.Hidden));
                }
                //最后一张图: 不处理下一张图的imgsSources

                time = int.Parse(paths[last].Name.Split('.').Reverse().ToArray()[1].Split('_').Last());
                Animations.Add(new Animation(this, time, () => imgs[last % 3].Visibility = Visibility.Visible
                , () => imgs[last % 3].Visibility = Visibility.Hidden));
            }
        }
        /// <summary>
        /// 单帧动画
        /// </summary>
        public class Animation
        {
            private PNGAnimation parent;
            /// <summary>
            /// 显示
            /// </summary>
            public Action Visible;
            /// <summary>
            /// 隐藏
            /// </summary>
            public Action Hidden;
            /// <summary>
            /// 帧时间
            /// </summary>
            public int Time;
            public Animation(PNGAnimation parent, int time, Action visible, Action hidden)
            {
                this.parent = parent;
                Time = time;
                Visible = visible;
                Hidden = hidden;
            }
            /// <summary>
            /// 运行该图层
            /// </summary>
            public void Run(Action EndAction = null)
            {
                //先显示该图层
                parent.Dispatcher.Invoke(Visible);
                //然后等待帧时间毫秒
                Thread.Sleep(Time);
                //判断是否要下一步
                if (parent.PlayState)
                {
                    if (++parent.nowid >= parent.Animations.Count)
                        if (parent.IsLoop)
                            parent.nowid = 0;
                        else if (parent.IsContinue)
                        {
                            parent.IsContinue = false;
                            parent.nowid = 0;
                        }
                        else
                        {
                            //parent.endwilldo = () => parent.Dispatcher.Invoke(Hidden);
                            //parent.Dispatcher.Invoke(Hidden);
                            if (parent.DoEndAction)
                                EndAction?.Invoke();//运行结束动画时事件

                            //重新加载第一帧
                            //Task.Run(() =>
                            //{
                            //    Thread.Sleep(25);
                            //    parent.Dispatcher.Invoke(Hidden);
                            //});
                            return;
                        }
                    //要下一步,现在就隐藏图层
                    //隐藏该图层
                    parent.Dispatcher.Invoke(Hidden);
                    parent.Animations[parent.nowid].Run(EndAction);
                    return;
                }
                else
                {
                    parent.IsContinue = false;
                    parent.Dispatcher.Invoke(Hidden);
                    if (parent.DoEndAction)
                        EndAction?.Invoke();//运行结束动画时事件
                    //Task.Run(() =>
                    //{
                    //    Thread.Sleep(25);
                    //    parent.Dispatcher.Invoke(Hidden);
                    //});
                }
            }
        }
        /// <summary>
        /// 从0开始运行该动画
        /// </summary>
        public void Run(Action EndAction = null)
        {
            //if(endwilldo != null && nowid != Animations.Count)
            //{
            //    endwilldo.Invoke();
            //    endwilldo = null;
            //}
            nowid = 0;
            PlayState = true;
            DoEndAction = true;
            new Thread(() => Animations[0].Run(EndAction)).Start();
        }

        public void Stop(bool StopEndAction = false)
        {
            DoEndAction = !StopEndAction;
            PlayState = false;
        }

    }
}