#region License

// Copyright 2005-2019 Paul Kohler (https://github.com/paulkohler/minisqlquery). All rights reserved.
// This source code is made available under the terms of the GNU Lesser General Public License v3.0
// https://github.com/paulkohler/minisqlquery/blob/master/LICENSE
#endregion

using System;
using System.IO;
using System.Windows.Forms;
using ICSharpCode.TextEditor.Document;
using Microsoft.VisualBasic;
using MiniSqlQuery.Commands;
using MiniSqlQuery.Core;
using MiniSqlQuery.Core.Commands;
using WeifenLuo.WinFormsUI.Docking;

namespace MiniSqlQuery
{
    /// <summary>The basic editor.</summary>
    public partial class BasicEditor : DockContent, IEditor, IFindReplaceProvider, INavigatableDocument
    {
        /// <summary>The _services.</summary>
        private readonly IApplicationServices _services;

        /// <summary>The _settings.</summary>
        private readonly IApplicationSettings _settings;

        /// <summary>The _file name.</summary>
        private string _fileName;

        /// <summary>The _highlighting provider loaded.</summary>
        private bool _highlightingProviderLoaded;

        /// <summary>The _is dirty.</summary>
        private bool _isDirty;

        /// <summary>The _text find service.</summary>
        private ITextFindService _textFindService;

        /// <summary>Initializes a new instance of the <see cref="BasicEditor"/> class.</summary>
        public BasicEditor()
        {
            InitializeComponent();
            txtEdit.Document.DocumentChanged += DocumentDocumentChanged;
        }

        /// <summary>Initializes a new instance of the <see cref="BasicEditor"/> class.</summary>
        /// <param name="services">The services.</param>
        /// <param name="settings">The settings.</param>
        public BasicEditor(IApplicationServices services, IApplicationSettings settings)
            : this()
        {
            _services = services;
            _settings = settings;

            formContextMenuStrip.Items.Add(CommandControlBuilder.CreateToolStripMenuItem<SaveFileCommand>());
            formContextMenuStrip.Items.Add(CommandControlBuilder.CreateToolStripMenuItemSeparator());
            formContextMenuStrip.Items.Add(CommandControlBuilder.CreateToolStripMenuItem<CloseActiveWindowCommand>());
            formContextMenuStrip.Items.Add(CommandControlBuilder.CreateToolStripMenuItem<CloseAllWindowsCommand>());
            formContextMenuStrip.Items.Add(CommandControlBuilder.CreateToolStripMenuItem<CopyQueryEditorFileNameCommand>());

            CommandControlBuilder.MonitorMenuItemsOpeningForEnabling(formContextMenuStrip);
        }

        /// <summary>Gets or sets AllText.</summary>
        public string AllText
        {
            get { return txtEdit.Text; }
            set { txtEdit.Text = value; }
        }

        /// <summary>Gets a value indicating whether CanReplaceText.</summary>
        public bool CanReplaceText
        {
            get { return true; }
        }

        /// <summary>Gets or sets CursorColumn.</summary>
        public int CursorColumn
        {
            get { return txtEdit.ActiveTextAreaControl.Caret.Column; }
            set { txtEdit.ActiveTextAreaControl.Caret.Column = value; }
        }

        /// <summary>Gets or sets CursorLine.</summary>
        public int CursorLine
        {
            get { return txtEdit.ActiveTextAreaControl.Caret.Line; }
            set { txtEdit.ActiveTextAreaControl.Caret.Line = value; }
        }

        /// <summary>Gets CursorOffset.</summary>
        public int CursorOffset
        {
            get { return txtEdit.ActiveTextAreaControl.Caret.Offset; }
        }

        /// <summary>Gets FileFilter.</summary>
        public virtual string FileFilter
        {
            get { return "Text Files (*.txt)|*.txt|All Files (*.*)|*.*"; }
        }

        /// <summary>Gets or sets FileName.</summary>
        public string FileName
        {
            get { return _fileName; }
            set
            {
                _fileName = value;
                Text = FileName;
                TabText = FileName;
            }
        }

        /// <summary>Gets or sets a value indicating whether IsDirty.</summary>
        public bool IsDirty
        {
            get { return _isDirty; }
            set
            {
                if (_isDirty != value)
                {
                    _isDirty = value;
                    SetTabTextByFilename();
                }
            }
        }

        /// <summary>Gets SelectedText.</summary>
        public string SelectedText
        {
            get { return txtEdit.ActiveTextAreaControl.SelectionManager.SelectedText; }
        }

        /// <summary>Gets TextFindService.</summary>
        public ITextFindService TextFindService
        {
            get
            {
                if (_textFindService == null)
                {
                    _textFindService = _services.Resolve<ITextFindService>();
                }

                return _textFindService;
            }
        }

        /// <summary>Gets TotalLines.</summary>
        public int TotalLines
        {
            get { return txtEdit.Document.TotalNumberOfLines; }
        }

        /// <summary>The load highlighting provider.</summary>
        public void LoadHighlightingProvider()
        {
            if (_highlightingProviderLoaded)
            {
                return;
            }

            // see: http://wiki.sharpdevelop.net/Syntax%20highlighting.ashx
            string dir = Path.GetDirectoryName(GetType().Assembly.Location);
            FileSyntaxModeProvider fsmProvider = new FileSyntaxModeProvider(dir);
            HighlightingManager.Manager.AddSyntaxModeFileProvider(fsmProvider); // Attach to the text editor.
            _highlightingProviderLoaded = true;
        }

        /// <summary>The clear selection.</summary>
        public void ClearSelection()
        {
            txtEdit.ActiveTextAreaControl.SelectionManager.ClearSelection();
        }

        /// <summary>The highlight string.</summary>
        /// <param name="offset">The offset.</param>
        /// <param name="length">The length.</param>
        public void HighlightString(int offset, int length)
        {
            if (offset < 0 || length < 1)
            {
                return;
            }

            int endPos = offset + length;
            txtEdit.ActiveTextAreaControl.SelectionManager.SetSelection(
                txtEdit.Document.OffsetToPosition(offset),
                txtEdit.Document.OffsetToPosition(endPos));
            SetCursorByOffset(endPos);
        }

        /// <summary>The insert text.</summary>
        /// <param name="text">The text.</param>
        public void InsertText(string text)
        {
            if (string.IsNullOrEmpty(text))
            {
                return;
            }

            int offset = txtEdit.ActiveTextAreaControl.Caret.Offset;

            // if some text is selected we want to replace it
            if (txtEdit.ActiveTextAreaControl.SelectionManager.IsSelected(offset))
            {
                offset = txtEdit.ActiveTextAreaControl.SelectionManager.SelectionCollection[0].Offset;
                txtEdit.ActiveTextAreaControl.SelectionManager.RemoveSelectedText();
            }

            txtEdit.Document.Insert(offset, text);
            int newOffset = offset + text.Length; // new offset at end of inserted text

            // now reposition the caret if required to be after the inserted text
            if (CursorOffset != newOffset)
            {
                SetCursorByOffset(newOffset);
            }

            txtEdit.Focus();
        }


        /// <summary>The load file.</summary>
        public void LoadFile()
        {
            txtEdit.LoadFile(FileName);
            IsDirty = false;
        }

        /// <summary>The save file.</summary>
        public void SaveFile()
        {
            txtEdit.SaveFile(FileName);
            IsDirty = false;
        }

        /// <summary>The set syntax.</summary>
        /// <param name="name">The name.</param>
        public void SetSyntax(string name)
        {
            LoadHighlightingProvider();
            txtEdit.SetHighlighting(name);
        }

        /// <summary>The find string.</summary>
        /// <param name="value">The value.</param>
        /// <param name="startIndex">The start index.</param>
        /// <param name="comparisonType">The comparison type.</param>
        /// <returns>The find string.</returns>
        public int FindString(string value, int startIndex, StringComparison comparisonType)
        {
            if (string.IsNullOrEmpty(value) || startIndex < 0)
            {
                return -1;
            }

            string text = AllText;
            int pos = text.IndexOf(value, startIndex, comparisonType);
            if (pos > -1)
            {
                ClearSelection();
                HighlightString(pos, value.Length);
            }

            return pos;
        }

        /// <summary>The replace string.</summary>
        /// <param name="value">The value.</param>
        /// <param name="startIndex">The start index.</param>
        /// <param name="length">The length.</param>
        /// <returns>The replace string.</returns>
        public bool ReplaceString(string value, int startIndex, int length)
        {
            if (value == null || startIndex < 0 || length < 0)
            {
                return false;
            }

            if ((startIndex + length) > AllText.Length)
            {
                return false;
            }

            txtEdit.Document.Replace(startIndex, length, value);

            return true;
        }

        /// <summary>The set text find service.</summary>
        /// <param name="textFindService">The text find service.</param>
        public void SetTextFindService(ITextFindService textFindService)
        {
            // accept nulls infering a reset
            _textFindService = textFindService;
        }

        /// <summary>The set cursor by location.</summary>
        /// <param name="line">The line.</param>
        /// <param name="column">The column.</param>
        /// <returns>The set cursor by location.</returns>
        public bool SetCursorByLocation(int line, int column)
        {
            if (line > TotalLines)
            {
                return false;
            }

            txtEdit.ActiveTextAreaControl.Caret.Line = line;
            txtEdit.ActiveTextAreaControl.Caret.Column = column;

            return true;
        }

        /// <summary>The set cursor by offset.</summary>
        /// <param name="offset">The offset.</param>
        /// <returns>The set cursor by offset.</returns>
        public bool SetCursorByOffset(int offset)
        {
            if (offset >= 0)
            {
                txtEdit.ActiveTextAreaControl.Caret.Position = txtEdit.Document.OffsetToPosition(offset);
                return true;
            }

            return false;
        }

        /// <summary>The basic editor_ form closing.</summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The e.</param>
        private void BasicEditor_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (_isDirty)
            {
                DialogResult saveFile = _services.HostWindow.DisplayMessageBox(
                    this,
                    "Contents changed, do you want to save the file?\r\n" + TabText, "Save Changes?",
                    MessageBoxButtons.YesNoCancel,
                    MessageBoxIcon.Question,
                    MessageBoxDefaultButton.Button1,
                    0,
                    null,
                    null);

                if (saveFile == DialogResult.Cancel)
                {
                    e.Cancel = true;
                }
                else if (saveFile == DialogResult.Yes)
                {
                    CommandManager.GetCommandInstance<SaveFileCommand>().Execute();
                }
            }
        }

        /// <summary>The basic editor_ load.</summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The e.</param>
        private void BasicEditor_Load(object sender, EventArgs e)
        {
#if DEBUG
            lblEditorInfo.Text = GetType().FullName;
#else
			panel1.Visible = false;
#endif
        }

        /// <summary>The document document changed.</summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The e.</param>
        private void DocumentDocumentChanged(object sender, DocumentEventArgs e)
        {
            IsDirty = true;
        }

        /// <summary>The get value.</summary>
        /// <param name="name">The name.</param>
        /// <returns>The get value.</returns>
        private string GetValue(string name)
        {
            string val = Interaction.InputBox(string.Format("Value for '{0}'", name), "Supply a Value", name, -1, -1);
            return val;
        }

        /// <summary>The set tab text by filename.</summary>
        private void SetTabTextByFilename()
        {
            string dirty = string.Empty;
            string text = "Untitled";
            string tabtext;

            if (_isDirty)
            {
                dirty = " *";
            }

            if (txtEdit.FileName != null)
            {
                text = FileName;
                tabtext = Path.GetFileName(FileName);
            }
            else
            {
                text += _settings.GetUntitledDocumentCounter();
                tabtext = text;
            }

            TabText = tabtext + dirty;
            ToolTipText = text + dirty;
        }
    }
}