using System;
using Microsoft.Win32;
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;
using System.Runtime.InteropServices;
using System.IO;

namespace Wallpaperchan
{
    public partial class MainForm : Form
    {

        int remainingSeconds = 0;
        int currentImageIndex = 0;
        string[] files;
        [DllImport("user32.dll", EntryPoint = "SystemParametersInfo")]
        public static extern int SystemParametersInfo(UAction uAction, int uParam, StringBuilder lpvParam, int fuWinIni);
     
        public enum UAction
        {
            /// <summary>
            /// set the desktop background image
            /// </summary>
            SPI_SETDESKWALLPAPER = 0x0014,
            /// <summary>
            /// set the desktop background image
            /// </summary>
            SPI_GETDESKWALLPAPER = 0x0073,
        }

        public static IEnumerable<FileInfo> GetFilesByExtensions(DirectoryInfo dir, params string[] extensions)
        {
            if (extensions == null)
                throw new ArgumentNullException("extensions");
            IEnumerable<FileInfo> files = dir.EnumerateFiles();
            return files.Where(f => extensions.Contains(f.Extension));
        }

        public static int SetBackgroud(string fileName)
        {
            int result = 0;
            if (File.Exists(fileName))
            {
                StringBuilder s = new StringBuilder(fileName);
                result = SystemParametersInfo(UAction.SPI_SETDESKWALLPAPER, 0, s, 0x2);
            }
            return result;
        }

        public MainForm()
        {
            InitializeComponent();
            
        }

        private void LoadImagesFromFolder(string folder)
        {
            //this.files = System.IO.Directory.GetFiles(folder, "*.png");

            DirectoryInfo dInfo = new DirectoryInfo(folder);
            this.files = GetFilesByExtensions(dInfo, ".jpg", ".png", ".jpeg", ".jfif").Select(f => f.FullName).ToArray();

            ImageList il = imageList1;
            il.Images.Clear();
            for (int i = 0; i < files.Count(); i++)
            {
                string image = files[i];
                this.status.Text = String.Format("Loading image {0}/{1}", i, files.Count());
                this.status.Refresh();
                //Application.DoEvents();
                try
                {
                    Image fullImage = Image.FromFile(image);
                    Image thumb = fullImage.GetThumbnailImage(112, 63, () => false, IntPtr.Zero);
                    fullImage.Dispose();
                    il.Images.Add(thumb);
                } catch
                {
                    continue;
                }
            }
            listView1.LargeImageList = il;
            listView1.Items.Clear();
            for (int i = 0; i < il.Images.Count; i++)
            {
                ListViewItem lvi = new ListViewItem();
                lvi.ImageIndex = i;
                lvi.Text = this.files[i];
                listView1.Items.Add(lvi);
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            
            string folder = ChooseFolder();
            Properties.Settings.Default.wallpaperFolder = folder;
            Properties.Settings.Default.Save();
            this.LoadImagesFromFolder(folder);
           
        }

        public string ChooseFolder()
        {
            if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
            {
               return  folderBrowserDialog1.SelectedPath;
            }
            return "";
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (this.listView1.FocusedItem == null) { return; }
            int index = this.listView1.FocusedItem.Index;
            SetBackgroud(files[index]);
            this.currentImageIndex = index;
            this.remainingSeconds = (int)this.delay.Value * 60;
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            if (this.files == null || files.Count() == 0)
            {
                return;
            }
            this.status.Text = String.Format("Current Image: {0} \nNext wallpaper in: {1} \nLoaded {2} wallpapers", currentImageIndex, remainingSeconds, listView1.Items.Count);
            this.remainingSeconds--;
            if (this.remainingSeconds <= 0)
            {
                this.remainingSeconds = (int)this.delay.Value * 60;
                this.currentImageIndex++;

                if (this.currentImageIndex > this.listView1.Items.Count -1)
                {
                    this.currentImageIndex = 0;
                }

            }
            SetBackgroud(files[this.currentImageIndex]);
        }

        private void delay_ValueChanged(object sender, EventArgs e)
        {
            Properties.Settings.Default.delay = (int)this.delay.Value;
            Properties.Settings.Default.Save();
        }

        private void btnPause_Click(object sender, EventArgs e)
        {
            this.timer1.Enabled = !this.timer1.Enabled;
            this.btnPause.Text = this.timer1.Enabled ? "Pause" : "Continue";
        }

        private void MainForm_Load(object sender, EventArgs e)
        {
            this.listView1.Items.Clear();
        }

        private void MainForm_Shown(object sender, EventArgs e)
        {
            this.Refresh();
            this.delay.Value = Properties.Settings.Default.delay;
            this.path.Text = Properties.Settings.Default.wallpaperFolder;
            if (this.path.Text != "")
            {
                this.LoadImagesFromFolder(this.path.Text);
            }
            this.currentImageIndex = Properties.Settings.Default.lastIndex;
            this.remainingSeconds = (int)this.delay.Value * 60;
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            if (listView1.View == View.LargeIcon)
            {
                listView1.View = View.List;
            } else
            {
                listView1.View = View.LargeIcon;
            }
        }
    }
}