using CodeWalker.GameFiles;
using CodeWalker.Properties;
using FastColoredTextBoxNS;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Xml;

namespace CodeWalker.Forms
{
    public partial class XmlForm : Form
    {
        private string xml;
        public string Xml
        {
            get { return xml; }
            set
            {
                xml = value;
                UpdateTextBoxFromData();
            }
        }

        private string fileName;
        public string FileName
        {
            get { return fileName; }
            set
            {
                fileName = value;
                UpdateFormTitle();
            }
        }
        public string FilePath { get; set; }

        private bool modified = false;
        private bool LoadingXml = false;
        private bool DelayHighlight = false;

        private ExploreForm exploreForm = null;
        public RpfFileEntry rpfFileEntry { get; private set; } = null;


        public XmlForm(ExploreForm owner)
        {
            exploreForm = owner;

            InitializeComponent();
        }



        public void LoadXml(string filename, string filepath, string xml, RpfFileEntry e)
        {
            FileName = filename;
            FilePath = filepath;
            Xml = xml;
            rpfFileEntry = e;
            modified = false;
        }

        private void UpdateFormTitle()
        {
            Text = fileName + " - XML Editor - CodeWalker by dexyfex";
        }

        private void UpdateTextBoxFromData()
        {
            LoadingXml = true;
            XmlTextBox.Text = "";
            XmlTextBox.Language = Language.XML;
            DelayHighlight = false;

            if (string.IsNullOrEmpty(xml))
            {
                LoadingXml = false;
                return;
            }
            //if (xml.Length > (1048576 * 5))
            //{
            //    XmlTextBox.Language = Language.Custom;
            //    XmlTextBox.Text = "[XML size > 10MB - Not shown due to performance limitations - Please use an external viewer for this file.]";
            //    return;
            //}
            //else 
            if (xml.Length > (1024 * 512))
            {
                XmlTextBox.Language = Language.Custom;
                DelayHighlight = true;
            }
            //else
            //{
            //    XmlTextBox.Language = Language.XML;
            //}


            Cursor = Cursors.WaitCursor;



            XmlTextBox.Text = xml;
            //XmlTextBox.IsChanged = false;
            XmlTextBox.ClearUndo();

            Cursor = Cursors.Default;
            LoadingXml = false;
        }



        private bool CloseDocument()
        {
            if (modified)
            {
                var res = MessageBox.Show("Do you want to save the current document before closing it?", "Save before closing", MessageBoxButtons.YesNoCancel);
                switch (res)
                {
                    case DialogResult.Yes:
                        SaveDocument();
                        break;
                    case DialogResult.Cancel:
                        return false;
                }
            }

            FilePath = "";
            FileName = "";
            Xml = "";
            modified = false;

            return true;
        }
        private void NewDocument()
        {
            if (!CloseDocument()) return; //same thing really..

            FileName = "New.xml";
        }
        private void OpenDocument()
        {
            if (OpenFileDialog.ShowDialog() != DialogResult.OK) return;

            if (!CloseDocument()) return;

            var fn = OpenFileDialog.FileName;

            if (!File.Exists(fn)) return; //couldn't find file?

            Xml = File.ReadAllText(fn);

            modified = false;
            FilePath = fn;
            FileName = new FileInfo(fn).Name;
        }
        private void SaveDocument(bool saveAs = false)
        {
            if (saveAs == false)
            {
                var doc = new XmlDocument();
                try
                {
                    doc.LoadXml(xml);
                }
                catch (Exception ex)
                {
                    MessageBox.Show("There's something wrong with your XML document:\r\n" + ex.Message, "Unable to parse XML");
                    return;
                }
                if (SaveToRPF(xml))
                {
                    return;
                }
                //if saving to RPF failed for whatever reason, fallback to saving the file in the filesystem.
                saveAs = true;
            }

            if (string.IsNullOrEmpty(FileName)) saveAs = true;
            if (string.IsNullOrEmpty(FilePath)) saveAs = true;
            else if ((FilePath.ToLowerInvariant().StartsWith(GTAFolder.CurrentGTAFolder.ToLowerInvariant()))) saveAs = true;
            if (!File.Exists(FilePath)) saveAs = true;

            var fn = FilePath;
            if (saveAs)
            {
                if (!string.IsNullOrEmpty(fn))
                {
                    var dir = new FileInfo(fn).DirectoryName;
                    if (!Directory.Exists(dir)) dir = "";
                    SaveFileDialog.InitialDirectory = dir;
                }
                SaveFileDialog.FileName = FileName;
                if (SaveFileDialog.ShowDialog() != DialogResult.OK) return;
                fn = SaveFileDialog.FileName;
            }

            File.WriteAllText(fn, xml);

            modified = false;
            FilePath = fn;
            FileName = new FileInfo(fn).Name;
        }





        private bool SaveToRPF(string txt)
        {

            if (!(exploreForm?.EditMode ?? false)) return false;
            if (rpfFileEntry?.Parent == null) return false;

            byte[] data = null;

            data = Encoding.UTF8.GetBytes(txt);

            if (data == null)
            {
                MessageBox.Show("Unspecified error - data was null!", "Cannot save XML file");
                return false;
            }

            if (!rpfFileEntry.Path.ToLowerInvariant().StartsWith("mods"))
            {
                if (MessageBox.Show("This file is NOT located in the mods folder - Are you SURE you want to save this file?\r\nWARNING: This could cause permanent damage to your game!!!", "WARNING: Are you sure about this?", MessageBoxButtons.YesNo) != DialogResult.Yes)
                {
                    return false;//that was a close one
                }
            }

            try
            {
                if (!(exploreForm?.EnsureRpfValidEncryption(rpfFileEntry.File) ?? false)) return false;

                var newentry = RpfFile.CreateFile(rpfFileEntry.Parent, rpfFileEntry.Name, data);
                if (newentry != rpfFileEntry)
                { }
                rpfFileEntry = newentry;

                exploreForm?.RefreshMainListViewInvoke(); //update the file details in explorer...

                modified = false;

                StatusLabel.Text = "XML file saved successfully at " + DateTime.Now.ToString();

                return true; //victory!
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error saving file to RPF! The RPF archive may be corrupted...\r\n" + ex.ToString(), "Really Bad Error");
            }

            return false;
        }






        Style BlueStyle = new TextStyle(Brushes.Blue, null, FontStyle.Regular);
        Style RedStyle = new TextStyle(Brushes.Red, null, FontStyle.Regular);
        Style MaroonStyle = new TextStyle(Brushes.Maroon, null, FontStyle.Regular);

        private void HTMLSyntaxHighlight(Range range)
        {
            //clear style of changed range
            range.ClearStyle(BlueStyle, MaroonStyle, RedStyle);
            //tag brackets highlighting
            range.SetStyle(BlueStyle, @"<|/>|</|>");
            //tag name
            range.SetStyle(MaroonStyle, @"<(?<range>[!\w]+)");
            //end of tag
            range.SetStyle(MaroonStyle, @"</(?<range>\w+)>");
            //attributes
            range.SetStyle(RedStyle, @"(?<range>\S+?)='[^']*'|(?<range>\S+)=""[^""]*""|(?<range>\S+)=\S+");
            //attribute values
            range.SetStyle(BlueStyle, @"\S+?=(?<range>'[^']*')|\S+=(?<range>""[^""]*"")|\S+=(?<range>\S+)");
        }

        private void XmlTextBox_VisibleRangeChangedDelayed(object sender, EventArgs e)
        {
            //this approach is much faster to load, but no outlining is available

            //highlight only visible area of text
            if (DelayHighlight)
            {
                HTMLSyntaxHighlight(XmlTextBox.VisibleRange);
            }
        }




        private void XmlTextBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            if (!LoadingXml)
            {
                xml = XmlTextBox.Text;
                modified = true;
            }
        }

        private void NewButton_ButtonClick(object sender, EventArgs e)
        {
            NewDocument();
        }

        private void OpenButton_ButtonClick(object sender, EventArgs e)
        {
            OpenDocument();
        }

        private void SaveButton_ButtonClick(object sender, EventArgs e)
        {
            SaveDocument();
        }

        private void FileNewMenu_Click(object sender, EventArgs e)
        {
            NewDocument();
        }

        private void FileOpenMenu_Click(object sender, EventArgs e)
        {
            OpenDocument();
        }

        private void FileSaveMenu_Click(object sender, EventArgs e)
        {
            SaveDocument();
        }

        private void FileSaveAsMenu_Click(object sender, EventArgs e)
        {
            SaveDocument(true);
        }

        private void FileCloseMenu_Click(object sender, EventArgs e)
        {
            Close();
        }

        private void XmlForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            e.Cancel = !CloseDocument();
        }
    }
}