using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace CDSAE3_Lian_Lian_Kan.Forms
{
    public partial class BufferForm : UserControl
    {
        public BufferForm()
        {
            InitializeComponent();
        }
        public void SetEffect(Color begin, Color end)
        {
            BackColor = begin;
            this.begin = begin;
            this.Dock = DockStyle.Fill;
            deltaRa = (0 - begin.R) / 5;
            deltaGa = (0 - begin.G) / 5;
            deltaBa = (0 - begin.B) / 5;
            deltaRb = (end.R - 0) / 5;
            deltaGb = (end.G - 0) / 5;
            deltaBb = (end.B - 0) / 5;
            this.end = Color.FromArgb(0, 0, 0);
        }
        Color begin;
        Color end;
        int deltaRa, deltaGa, deltaBa;
        int deltaRb, deltaGb, deltaBb;
        public async Task EffectAsync()
        {
            try
            {
                for (int i = 0; i < 5; i++)
                {
                    begin = Color.FromArgb(begin.R + deltaRa, begin.G + deltaGa, begin.B + deltaBa);
                    SolidBrush brush = new SolidBrush(begin);
                    Graphics graphics = this.CreateGraphics();
                    graphics.FillRectangle(brush, 0, 0, Width, Height);
                    //await System.Timers.Timer.
                    await Task.Delay(100);
                }
                loading.Text = "";
                BackColor = Color.FromArgb(0, 0, 0);
                loading.Visible = true;
                for (int i = 1; i < "Loading".Length; i++)
                {
                    string s = "Loading".Substring(0, i);
                    s += GetRandomStr("", "Loading".Length - i);
                    loading.Text = s;
                    await Task.Delay(100);
                }
                while (!Etcs.loadFinished)
                    for (int i = 0; i < 4; i++)
                    {
                        await Console.Out.WriteLineAsync("等待完成");
                        loading.Text = "Loading" + new string('.', i % 4);
                        await Task.Delay(100);
                    }
                loading.Visible = false;
                for (int i = 0; i < 5; i++)
                {
                    end = Color.FromArgb(end.R + deltaRb, end.G + deltaGb, end.B + deltaBb);
                    SolidBrush brush = new SolidBrush(end);
                    Graphics graphics = this.CreateGraphics();
                    graphics.FillRectangle(brush, 0, 0, Width, Height);
                    await Task.Delay(100);
                }
                Visible = false;
            }
            catch (Exception e)
            {
                e.InnerException?.ToString();
            }
        }
        private Random _random = new Random();
        /// <summary>
        /// 随机字符串
        /// </summary>
        /// <param name="chars"></param>
        /// <param name="length"></param>
        /// <returns></returns>
        public string GetRandomStr(string chars, int length)
        {
            if (string.IsNullOrEmpty(chars))
            {
                chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghizklmnopqrstuvwxyz0123456789";
            }
            //const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            return new string(Enumerable.Repeat(chars, length)
              .Select(s => s[_random.Next(s.Length)]).ToArray());
        }

    }
}