using System;
using System.Collections.Specialized;
using System.Windows.Forms;
using YLErp.MailKit;

namespace YLMailTest
{
    public partial class FormMail : Form
    {
        public FormMail()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                int port = 25;
                var strPort = tbPort.Text.Trim();
                if (!string.IsNullOrEmpty(tbPort.Text) && !int.TryParse(tbPort.Text, out port))
                {
                    MessageBox.Show("解析端口失败:" + tbPort.Text);
                    return;
                }

                var smtpConfig = new SmtpConfig
                {
                    EnableSsl = chkSSL.Checked,
                    From = tbFrom.Text.Trim(),
                    Password = tbPassword.Text,
                    Port = port,
                    Receipt = chkReceipt.Checked,
                    Server = tbServer.Text.Trim(),
                    UserName = tbUserName.Text.Trim(),
                    ZipAttach = false
                };
                var mailSubject = tbMailSubject.Text.Trim();
                var mailBody = tbMailBody.Text.Trim();
                MailSender.Send(smtpConfig, new MailSendingOption
                {
                    MailTo = new[] { tbMailTo.Text.Trim() },
                    Subject = string.IsNullOrEmpty(mailSubject) ? "测试邮件发送" : mailSubject,
                    Body = string.IsNullOrEmpty(mailBody) ? "测试邮件发送" : mailBody,
                    IsBodyHtml = false,
                    FilesToAttach = null,
                    CC = null
                });
                MessageBox.Show("邮件发送成功");
            }
            catch (Exception ex)
            {
                MessageBox.Show("邮件发送失败:\r\n" + ex.ToString());
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            var str = textBox1.Text;

            if (string.IsNullOrWhiteSpace(str))
            {
                return;
            }

            SmtpConfig sc;

            var index = str.IndexOf("[|]");
            if (index > 0)
            {
                str = str.Substring(0, index);
            }
            var nv = UrlHelper.ParseQueryString(str, true);

            chkSSL.Checked = nv[nameof(sc.EnableSsl)]?.ToLowerInvariant() == "true";
            chkReceipt.Checked = nv[nameof(sc.Receipt)]?.ToLowerInvariant() == "true";

            tbServer.Text = nv[nameof(sc.Server)];
            tbPort.Text = nv[nameof(sc.Port)];

            tbFrom.Text = nv[nameof(sc.From)];
            tbUserName.Text = nv[nameof(sc.UserName)];
            tbPassword.Text = nv[nameof(sc.Password)];
        }
    }

    public static class UrlHelper
    {
        /// <summary>
        /// 解析url查询字符串，支持&amp;&amp;转义为&amp;,所以和标准规范有出入
        /// </summary>
        public static NameValueCollection ParseQueryString(string query, bool urlencoded = false)
        {
            if (string.IsNullOrWhiteSpace(query))
            {
                return null;
            }

            var len = query.Length;
            var buf = new char[len + 2];
            query.CopyTo(0, buf, 0, len);

            //在下面的循环中正好排除最后一个处理
            buf[len++] = '&';
            buf[len++] = 'm';

            var startPos = 0;
            var hasEscape = false;
            var nv = new NameValueCollection(10);

            for (var index = 0; index < len; index++)
            {
                if (buf[index] != '&')
                {
                    continue;
                }

                if (!urlencoded && buf[index + 1] == '&')
                {
                    index++;
                    hasEscape = true;
                    continue;
                }

                var index2 = startPos;
                startPos = index + 1;
                var substr = new string(buf, index2, index - index2).Trim();

                if (substr.Length == 0)
                {
                    continue;
                }

                if (hasEscape)
                {
                    hasEscape = false;
                    substr = substr.Replace("&&", "&");
                }

                index2 = substr.IndexOf('=');

                if (index2 > 0)
                {
                    var key = substr.Substring(0, index2);
                    var value = substr.Substring(index2 + 1);
                    if (urlencoded)
                    {
                        key = Uri.UnescapeDataString(key);
                        value = Uri.UnescapeDataString(value);
                    }
                    nv.Add(key.Trim(), value.Trim());
                }
                else
                {
                    var key = substr;
                    if (urlencoded)
                    {
                        key = Uri.UnescapeDataString(key);
                    }
                    nv.Add(key.Trim(), string.Empty);
                }
            }

            return nv;
        }
    }
}