using System;
using System.IO;
using System.Text;
using System.Windows.Forms;

namespace FileNameCharsetConvert
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();

            cmbEncoding.DataSource = Encoding.GetEncodings();
        }

        private void btnSelectFolder_Click(object sender, EventArgs e)
        {
            if (dlgFolder.ShowDialog() == DialogResult.OK)
            {
                txtFolder.Text = dlgFolder.SelectedPath;
            }
        }

        private void btnScan_Click(object sender, EventArgs e)
        {
            lvMain.Items.Clear();

            var files = Directory.GetFiles(txtFolder.Text, "*.*", System.IO.SearchOption.AllDirectories);

            for (var i = 0; i < files.Length; i++)
            {
                proc.Value = (int)(i * 1.0f / files.Length * 100);
                var lvi = new ListViewItem { Text = files[i] };
                lvi.SubItems.Add("               ");
                lvi.SubItems.Add("未转换");

                lvMain.Items.Add(lvi);
            }

            lvces();

            proc.Value = 100;
        }

        private void btnConvert_Click(object sender, EventArgs e)
        {
            var enci = (EncodingInfo)cmbEncoding.SelectedItem;
            var enc = enci.GetEncoding();
            var def = Encoding.Default;

            for (var i = 0; i < lvMain.Items.Count; i++)
            {
                proc.Value = (int)(i * 1.0f / lvMain.Items.Count * 100);
                var item = lvMain.Items[i];
                item.SubItems[1].Text = enc.GetString(def.GetBytes(item.Text));
                item.SubItems[2].Text = "已转换,未应用";
            }

            lvces();
        }

        private void lvces()
        {
            foreach (ColumnHeader item in lvMain.Columns)
            {
                item.AutoResize(ColumnHeaderAutoResizeStyle.ColumnContent);
            }
        }

        private void btnApplySelection_Click(object sender, EventArgs e)
        {
            for (var i = 0; i < lvMain.SelectedItems.Count; i++)
            {
                var lvi = lvMain.SelectedItems[i];

                try
                {
                    File.Move(lvi.Text, lvi.SubItems[1].Text);
                    lvi.SubItems[2].Text = "成功应用";
                }
                catch (Exception ex)
                {
                    lvi.SubItems[2].Text = "应用失败:" + ex.Message;
                }
            }
        }

        private void txtFolder_DragEnter(object sender, DragEventArgs e)
        {
            string[] files;
            e.Effect =
                e.Data.GetDataPresent(DataFormats.FileDrop) && (files = (string[])e.Data.GetData(DataFormats.FileDrop)).Length == 1 && Directory.Exists(files[0])
                    ? DragDropEffects.Link
                    : DragDropEffects.None;
        }

        private void txtFolder_DragDrop(object sender, DragEventArgs e)
        {
            txtFolder.Text = ((string[])e.Data.GetData(DataFormats.FileDrop))[0];
        }
    }
}