using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Text.RegularExpressions;
using FastReport.Forms;
using FastReport.Utils;

namespace FastReport.Export.Email
{
    /// <summary>
    /// Form for <see cref="EmailExport"/>.
    /// For internal use only.
    /// </summary>
    public partial class EmailExportForm : BaseDialogForm
    {
        private EmailExport export;
        private List<ExportBase> exports;

        // Create the ToolTip and associate with the Form container.
        private ToolTip ttCC = new ToolTip();
        private string ttCCText;

        private bool IsValidEmail(string strIn)
        {
            // Return true if strIn is in valid e-mail format.
            return Regex.IsMatch(strIn,
                   @"^(?("")("".+?""@)|(([0-9a-zA-Z]((\.(?!\.))|[-!#\$%&'\*\+/=\?\^`\{\}\|~\w])*)(?<=[0-9a-zA-Z])@))" +
                   @"(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,6}))$");
        }

        private void EmailExportForm_Shown(object sender, EventArgs e)
        {
            if (String.IsNullOrEmpty(tbAddressFrom.Text) || String.IsNullOrEmpty(tbHost.Text))
            {
                pageControl1.ActivePageIndex = 1;
                if (String.IsNullOrEmpty(tbAddressFrom.Text))
                    tbAddressFrom.Focus();
                else
                    tbHost.Focus();
            }
            else
            {
                cbxAddressTo.Focus();
                if (!export.Account.AllowUI)
                {
                    pageControl1.Width -= pageControl1.SelectorWidth;
                    Width -= pageControl1.SelectorWidth;
                    pageControl1.SelectorWidth = 0;
                }
            }
        }

        private void cbxAttachment_SelectedIndexChanged(object sender, EventArgs e)
        {
            btnSettings.Enabled = cbxAttachment.SelectedIndex > 0;
        }

        private void btnSettings_Click(object sender, EventArgs e)
        {
            ExportBase export = exports[cbxAttachment.SelectedIndex];
            export.SetReport(this.export.Report);
            export.ShowDialog();
        }

        private void Init()
        {
            XmlItem xi = Config.Root.FindItem("EmailExport").FindItem("AccountSettings");

            // restore account info from the config
            if (String.IsNullOrEmpty(export.Account.Address))
            {
                export.Account.Address = xi.GetProp("Address");
                export.Account.Name = xi.GetProp("Name");
                export.Account.MessageTemplate = xi.GetProp("Template");
                export.Account.Host = xi.GetProp("Host");
                string port = xi.GetProp("Port");
                if (port != "")
                    export.Account.Port = int.Parse(port);
                export.Account.UserName = Crypter.DecryptString(xi.GetProp("UserName"));
                export.Account.Password = Crypter.DecryptString(xi.GetProp("Password"));
                export.Account.EnableSSL = xi.GetProp("EnableSSL") == "1";
            }

            // fill account info
            tbAddressFrom.Text = export.Account.Address;
            tbName.Text = export.Account.Name;
            tbTemplate.Text = export.Account.MessageTemplate;
            tbHost.Text = export.Account.Host;
            udPort.Value = export.Account.Port;
            tbUserName.Text = export.Account.UserName;
            tbPassword.Text = export.Account.Password;
            cbEnableSSL.Checked = export.Account.EnableSSL;

            // fill email
            tbNameAttach.Text = export.Report.GetReportName;
            if (!String.IsNullOrEmpty(export.NameAttachmentFile))
            {
                tbNameAttach.Text = export.NameAttachmentFile;
            }

            string[] addresses = xi.GetProp("RecentAddresses").Split('\r');
            cbxAddressTo.Items.AddRange(addresses);
            if (!String.IsNullOrEmpty(export.Address))
                cbxAddressTo.Text = export.Address;
            else if (cbxAddressTo.Items.Count > 0)
                cbxAddressTo.SelectedIndex = 0;
            string[] cc = export.CC;
            if (cc != null)
            {
                for (int i = 0; i < cc.Length; i++)
                    tbCC.Text += cc[i] + (i < cc.Length - 1 ? ";" : "");
            }

            string[] subjects = xi.GetProp("RecentSubjects").Split('\r');
            cbxSubject.Items.AddRange(subjects);
            if (!String.IsNullOrEmpty(export.Subject))
                cbxSubject.Text = export.Subject;
            else if (cbxSubject.Items.Count > 0)
                cbxSubject.SelectedIndex = 0;

            if (!String.IsNullOrEmpty(export.MessageBody))
                tbMessage.Text = export.MessageBody;
            else
                tbMessage.Text = tbTemplate.Text;

            // fill exports
            exports = new List<ExportBase>();
            List<ObjectInfo> list = new List<ObjectInfo>();
            RegisteredObjects.Exports.EnumItems(list);

            int exportIndex = 0;
            cbxAttachment.Items.Add(Res.Get("Preview,SaveNative"));
            exports.Add(null);

            foreach (ObjectInfo info in list)
            {
                if (info.Object != null)
                {
                    cbxAttachment.Items.Add(Res.TryGet(info.Text));
                    exports.Add(Activator.CreateInstance(info.Object) as ExportBase);
                    if (export.Export != null && export.Export.GetType() == info.Object)
                        exportIndex = exports.Count - 1;
                }
            }

            string recentExport = xi.GetProp("RecentExport");
            if (exportIndex != 0)
                cbxAttachment.SelectedIndex = exportIndex;
            else if (recentExport != "")
                cbxAttachment.SelectedIndex = int.Parse(recentExport);
            else
                cbxAttachment.SelectedIndex = 0;
        }

        private bool Done()
        {
            if (!IsValidEmail(tbAddressFrom.Text))
            {
                pageControl1.ActivePageIndex = 1;
                FRMessageBox.Error(Res.Get("Export,Email,AddressError"));
                tbAddressFrom.Focus();
                return false;
            }
            if (String.IsNullOrEmpty(tbHost.Text))
            {
                pageControl1.ActivePageIndex = 1;
                FRMessageBox.Error(Res.Get("Export,Email,HostError"));
                tbHost.Focus();
                return false;
            }
            if (!IsValidEmail(cbxAddressTo.Text))
            {
                pageControl1.ActivePageIndex = 0;
                FRMessageBox.Error(Res.Get("Export,Email,AddressError"));
                cbxAddressTo.Focus();
                return false;
            }

            XmlItem xi = Config.Root.FindItem("EmailExport").FindItem("AccountSettings");

            // get account info
            export.Account.Address = tbAddressFrom.Text;
            export.Account.Name = tbName.Text;
            export.Account.MessageTemplate = tbTemplate.Text;
            export.Account.Host = tbHost.Text;
            export.Account.Port = (int)udPort.Value;
            export.Account.UserName = tbUserName.Text;
            export.Account.Password = tbPassword.Text;
            export.Account.EnableSSL = cbEnableSSL.Checked;

            // save account info
            xi.SetProp("Address", export.Account.Address);
            xi.SetProp("Name", export.Account.Name);
            xi.SetProp("Template", export.Account.MessageTemplate);
            xi.SetProp("Host", export.Account.Host);
            xi.SetProp("Port", export.Account.Port.ToString());
            xi.SetProp("UserName", Crypter.EncryptString(export.Account.UserName));
            xi.SetProp("Password", Crypter.EncryptString(export.Account.Password));
            xi.SetProp("EnableSSL", export.Account.EnableSSL ? "1" : "0");

            // get email info
            export.Address = cbxAddressTo.Text.Trim();
            export.CC = tbCC.Text.Trim() == "" ? null : tbCC.Text.Trim().Split(';');
            export.Subject = cbxSubject.Text;
            export.MessageBody = tbMessage.Text;
            export.NameAttachmentFile = tbNameAttach.Text;
            export.Export = exports[cbxAttachment.SelectedIndex];

            // save email info
            string addresses = "\r" + cbxAddressTo.Text + "\r";
            foreach (object obj in cbxAddressTo.Items)
            {
                string address = obj.ToString();
                if (!addresses.Contains("\r" + address + "\r"))
                    addresses += address + "\r";
            }

            addresses = addresses.Substring(1, addresses.Length - 2);
            xi.SetProp("RecentAddresses", addresses);

            string subjects = "\r" + cbxSubject.Text + "\r";
            foreach (object obj in cbxSubject.Items)
            {
                string subject = obj.ToString();
                if (!subjects.Contains("\r" + subject + "\r"))
                    subjects += subject + "\r";
            }

            subjects = subjects.Substring(1, subjects.Length - 2);
            xi.SetProp("RecentSubjects", subjects);

            xi.SetProp("RecentExport", cbxAttachment.SelectedIndex.ToString());
            return true;
        }

        /// <summary>
        /// Hides attachment settings.
        /// For internal use only.
        /// </summary>
        public void HideAttachmentSettings()
        {
            lblAttachment.Visible = false;
            cbxAttachment.Visible = false;
            btnSettings.Visible = false;
        }

        /// <inheritdoc/>
        public override void Localize()
        {
            base.Localize();

            MyRes res = new MyRes("Export,Email");
            Text = res.Get("");
            pgEmail.Text = res.Get("Email");
            lblAddressTo.Text = res.Get("Address");
            lblCC.Text = res.Get("CC");
            ttCCText = res.Get("CCTooltip");
            lblSubject.Text = res.Get("Subject");
            lblMessage.Text = res.Get("Message");
            lblAttachment.Text = res.Get("Attachment");
            btnSettings.Text = res.Get("Settings");
            pgAccount.Text = res.Get("Account");
            lblAddressFrom.Text = res.Get("Address");
            lblName.Text = res.Get("Name");
            lblTemplate.Text = res.Get("Template");
            lblHost.Text = res.Get("Host");
            lblPort.Text = res.Get("Port");
            lblUserName.Text = res.Get("UserName");
            lblPassword.Text = res.Get("Password");
            cbEnableSSL.Text = res.Get("EnableSSL");
            lblNameAttcach.Text = res.Get("NameAttachmentFile");
        }

        private void EmailExportForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (DialogResult == DialogResult.OK)
                if (!Done())
                    e.Cancel = true;
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="EmailExportForm"/> class.
        /// </summary>
        public EmailExportForm(EmailExport export)
        {
            this.export = export;
            InitializeComponent();
            Localize();
            Init();
            UIUtils.CheckRTL(this);
            UpdateDpiDependencies();
        }

        private void tbCC_MouseMove(object sender, MouseEventArgs e)
        {
            ttCC.SetToolTip(this.tbCC, ttCCText);
        }
    }
}