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

namespace FilesSeeker
{
    public partial class Form1 : Form
    {
        public string _rootFolder = null;
        public List<FindedFile> _files = new List<FindedFile>();

        public int _browsedFolders = 0;


        public Form1()
        {
            InitializeComponent();
        }

        private void AnalyzeButton_Click(object sender, EventArgs e)
        {
            DirectoryInfo info = new DirectoryInfo(_rootFolder);
            try
            {
                if (!BrowsFolderWorker.IsBusy)
                {
                    CancelBrowsingButton.Visible = true;
                    AnalyzeButton.Enabled = false;

                    BrowsFolderWorker.RunWorkerAsync(_rootFolder);

                    CancelBrowsingButton.Visible = false;
                    AnalyzeButton.Enabled = true;
                }
            }
            catch (Exception exception)
            {
                MessageBox.Show("Exception: " + exception.Message);
            }

        }

        private void SelectDirectoryButton_Click(object sender, EventArgs e)
        {
            bool shouldActivateAnalyzeButton = false;
            if (_rootFolder == null)
                shouldActivateAnalyzeButton = true;

            if (folderBrowserDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                _rootFolder = folderBrowserDialog1.SelectedPath;
                if (shouldActivateAnalyzeButton)
                {
                    AnalyzeButton.Enabled = true;
                }
            }
        }



        private void BrowsFolderWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker worker = sender as BackgroundWorker;

            DirectoryInfo directoryInfo = e.Argument as DirectoryInfo;
            _browsedFolders = 1;
            List<FindedFile> files = new List<FindedFile>();
            try
            {
                for (int i = 0; i < directoryInfo.GetFiles().Length; i++)
                {
                    if (worker.CancellationPending)
                    {
                        e.Cancel = true;
                        return;
                    }
                    else
                    {
                        try
                        {
                            var findedFile = directoryInfo.GetFiles()[i];
                            files.Add(new FindedFile(findedFile.FullName));
                        }
                        catch
                        { }
                    }
                }
                int directoriesCount = directoryInfo.GetDirectories().Length;
                for (int i = 0; i < directoriesCount; i++)
                {
                    if (worker.CancellationPending)
                    {
                        e.Cancel = true;
                        return;
                    }
                    else
                    {
                        try
                        {

                            var findedDirectory = directoryInfo.GetDirectories()[i];
                            var filesInFolder = FileBrowser.GetFilesInFolder(findedDirectory);
                            files.AddRange(filesInFolder.Files);
                            _browsedFolders = _browsedFolders + filesInFolder.BrowsedFolders;

                            if (directoriesCount > 0)
                            {
                                int progress = (i / directoriesCount) * 100;
                                worker.ReportProgress(progress);
                            }
                        }
                        catch
                        { }
                    }
                }
            }
            catch (Exception exception)
            {
                if (exception != null)
                {
                    if (!(exception is UnauthorizedAccessException))
                    {
                      throw exception;
                    }
                }
            }
            _files = files;

        }

        private void BrowsFolderWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            if (browsingProgress.Visible == false)
                browsingProgress.Visible = true;
            browsingProgress.Value = e.ProgressPercentage;
        }

        private void BrowsFolderWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (e.Cancelled)
            {
                MessageBox.Show("The browsing was cancelled.", "Browsing Cancelled", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
            else if (e.Error != null)
            {
                MessageBox.Show("An error occured: " + Environment.NewLine + e.Error.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            else
            {
                if (dataGridView1.DataSource == null)
                    dataGridView1.DataSource = _files;
                BrowserCountLabel.Text = "Browsed folders: " + _browsedFolders;
                FileCountLabel.Text = "Finded files: " + _files.Count;

                MessageBox.Show("Browing completed: " + _files.Count + " files finds.", "Browsing Completed", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }

    }
}