/*
    Copyright 2012 MCGalaxy 
    Dual-licensed under the Educational Community License, Version 2.0 and
    the GNU General Public License, Version 3 (the "Licenses"); you may
    not use this file except in compliance with the Licenses. You may
    obtain a copy of the Licenses at'
 
http://www.opensource.org/licenses/ecl2.php
http://www.gnu.org/licenses/gpl-3.0.html
 
    Unless required by applicable law or agreed to in writing,
    software distributed under the Licenses are distributed on an "AS IS"
    BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
    or implied. See the Licenses for the specific language governing
    permissions and limitations under the Licenses.
*/

using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using MCGalaxy.Gui.Native;

//MCGalaxy 6 Preview :D

namespace MCGalaxy.Gui.Components {

    /// <summary> A rich text box, that can parse Minecraft/MCGalaxy color codes. </summary>
    public partial class ColoredTextBox : RichTextBox {

        bool _nightMode = false, _colorize = true;
        bool _showDateStamp = true, _autoScroll = true;

        /// <summary>
        /// Gets or sets a value indicating whether to scroll automaticly
        /// </summary>
        /// <value> <c>true</c> if [auto scroll]; otherwise, <c>false</c>. </value>
        [Browsable(true)]
        [Category("MCGalaxy")]
        [DefaultValue(true)]
        public bool AutoScroll {
            get { return _autoScroll; }
            set {
                _autoScroll = value;
                if ( value ) ScrollToEnd(0);
            }
        }


        /// <summary> Gets or sets a value indicating whether this <see cref="ColoredTextBox"/> is colorized. </summary>
        /// <value> <c>true</c> if colorized; otherwise, <c>false</c>. </value>
        [Browsable(true)]
        [Category("MCGalaxy")]
        [DefaultValue(true)]
        public bool Colorize {
            get { return _colorize; }
            set { _colorize = value; }
        }

        /// <summary> Gets or sets a value indicating whether it will include a date stamp in the log </summary>
        /// <value> <c>true</c> if [date stamp]; otherwise, <c>false</c>. </value>
        [Browsable(true)]
        [Category("MCGalaxy")]
        [DefaultValue(true)]
        public bool DateStamp {
            get { return _showDateStamp; }
            set { _showDateStamp = value; }
        }

        /// <summary>
        /// Gets or sets a value indicating whether the TextBox is in nightmode. This will clear the text box when changed.
        /// </summary>
        /// <value>
        ///   <c>true</c> if [night mode]; otherwise, <c>false</c>.
        /// </value>
        [Browsable(true)]
        [Category("MCGalaxy")]
        [DefaultValue(false)]
        public bool NightMode {
            get { return _nightMode; }
            set {
                _nightMode = value;
                Clear();

                ForeColor = value ? Color.Black : Color.White;
                BackColor = value ? Color.White : Color.Black;
                Invalidate();
            }
        }


       string CurrentDate { get { return "[" + DateTime.Now.ToString("T") + "] "; } }

        /// <summary> Initializes a new instance of the <see cref="ColoredTextBox"/> class. </summary>
        public ColoredTextBox() : base() {
            InitializeComponent();
        }

        /// <summary> Appends the log. </summary>
        /// <param name="text">The text to log.</param>
        public void AppendLog(string text, Color foreColor, bool dateStamp) {
            if (InvokeRequired) {
                Invoke((MethodInvoker)(() => AppendLog(text, foreColor, dateStamp)));
                return;
            }
            if (dateStamp) Append(CurrentDate, Color.Gray);
            int line = GetLineFromCharIndex(Math.Max(0, TextLength - 1));
            
            if (!Colorize) {                
                AppendText(text);                
                if (AutoScroll) ScrollToEnd(line);
                return;
            }
            Formatter.Format(text, (c, s) => Formatter.FormatGui(c, s, this, foreColor));
            if (AutoScroll) ScrollToEnd(line);
        }

        /// <summary> Appends the log. </summary>
        /// <param name="text">The text to log.</param>
        public void AppendLog(string text) {
            AppendLog(text, ForeColor, DateStamp);
        }

        /// <summary> Appends the log. </summary>
        /// <param name="text">The text to log.</param>
        /// <param name="foreColor">Color of the foreground.</param>
        internal void Append(string text, Color foreColor) {
            if (InvokeRequired) {
        		Invoke((MethodInvoker)(() => Append(text, foreColor))); return;
            }

            SelectionStart = TextLength;
            SelectionLength = 0;
            SelectionColor = foreColor;
            AppendText(text);
            SelectionColor = ForeColor;
        }

        void ColoredReader_LinkClicked(object sender, System.Windows.Forms.LinkClickedEventArgs e) {
            if ( !e.LinkText.StartsWith("http://www.minecraft.net/classic/play/") ) {
                if ( MessageBox.Show("Never open links from people that you don't trust!", "Warning!!", MessageBoxButtons.OKCancel) == DialogResult.Cancel )
                    return;
            }

            try { Process.Start(e.LinkText); }
            catch { }

        }

        /// <summary> Scrolls to the end of the log </summary>
        public void ScrollToEnd(int startIndex) {
            if ( InvokeRequired ) {
                Invoke((MethodInvoker)(() => ScrollToEnd(startIndex)));
                return;
            }
            int lines = GetLineFromCharIndex(TextLength - 1) - startIndex + 1;
            for (int i = 0; i < lines; i++)
                Natives.SendMessage(Handle, 0xB5, (IntPtr)1, IntPtr.Zero);
            Invalidate();
        }


        #region Border Style

        private RECT _border;

        protected override void WndProc(ref Message m) {
            if ( Environment.OSVersion.Platform != PlatformID.Win32NT ) {
                base.WndProc(ref m);
                return;
            }

            switch ( m.Msg ) {
                case Natives.WM_NCPAINT:
                    RenderStyle(ref m);
                    break;
                case Natives.WM_NCCALCSIZE:
                    CalculateSize(ref m);
                    break;
                case Natives.WM_THEMECHANGED:
                    UpdateStyles();
                    break;
                default:
                    base.WndProc(ref m);
                    break;
            }
        }

        void CalculateSize(ref Message m) {
            base.WndProc(ref m);
            if (!Natives.CanRender()) return;

            Natives.NCCALCSIZE_PARAMS par = new Natives.NCCALCSIZE_PARAMS();

            RECT windowRect;

            if ( m.WParam == IntPtr.Zero ) {
                windowRect = (RECT)Marshal.PtrToStructure(m.LParam, typeof(RECT));
            }
            else {
                par = (Natives.NCCALCSIZE_PARAMS)Marshal.PtrToStructure(m.LParam, typeof(Natives.NCCALCSIZE_PARAMS));
                windowRect = par.rgrc0;
            }

            RECT contentRect;
            IntPtr hDC = Natives.GetWindowDC(this.Handle);
            IntPtr hTheme = Natives.OpenThemeData(this.Handle, "EDIT");

            if ( Natives.GetThemeBackgroundContentRect(hTheme, hDC, Natives.EP_EDITTEXT, Natives.ETS_NORMAL, ref windowRect, out contentRect) == Natives.S_OK ) {
                contentRect.Inflate(-1, -1);
                this._border = new Margins(contentRect.Left - windowRect.Left,
                                                                        contentRect.Top - windowRect.Top,
                                                                         windowRect.Right - contentRect.Right,
                                                                         windowRect.Bottom - contentRect.Bottom);


                if ( m.WParam == IntPtr.Zero ) {
                    Marshal.StructureToPtr(contentRect, m.LParam, false);
                }
                else {
                    par.rgrc0 = contentRect;
                    Marshal.StructureToPtr(par, m.LParam, false);
                }

                m.Result = new IntPtr(Natives.WVR_REDRAW);
            }

            Natives.CloseThemeData(hTheme);
            Natives.ReleaseDC(this.Handle, hDC);

        }

        private void RenderStyle(ref Message m) {
            base.WndProc(ref m);
            if (!Natives.CanRender()) return;

            int partId = Natives.EP_EDITTEXT;

            int stateId;
            if ( this.Enabled )
                stateId = this.ReadOnly ? Natives.ETS_READONLY : Natives.ETS_NORMAL;
            else
                stateId = Natives.ETS_DISABLED;

            RECT windowRect;
            Natives.GetWindowRect(this.Handle, out windowRect);
            windowRect.Right -= windowRect.Left;
            windowRect.Bottom -= windowRect.Top;
            windowRect.Top = 0;
            windowRect.Left = 0;

            IntPtr hDC = Natives.GetWindowDC(this.Handle);

            RECT clientRect = windowRect;
            clientRect.Left += this._border.Left;
            clientRect.Top += this._border.Top;
            clientRect.Right -= this._border.Right;
            clientRect.Bottom -= this._border.Bottom;

            Natives.ExcludeClipRect(hDC, clientRect.Left, clientRect.Top, clientRect.Right, clientRect.Bottom);

            IntPtr hTheme = Natives.OpenThemeData(this.Handle, "EDIT");

            if ( Natives.IsThemeBackgroundPartiallyTransparent(hTheme, Natives.EP_EDITTEXT, Natives.ETS_NORMAL) != 0 )
                Natives.DrawThemeParentBackground(this.Handle, hDC, ref windowRect);


            Natives.DrawThemeBackground(hTheme, hDC, partId, stateId, ref windowRect, IntPtr.Zero);
            Natives.CloseThemeData(hTheme);
            Natives.ReleaseDC(this.Handle, hDC);
            m.Result = IntPtr.Zero;
        }

        protected override CreateParams CreateParams {
            get {
                CreateParams p = base.CreateParams;

                if ( Natives.CanRender() && ( p.ExStyle & Natives.WS_EX_CLIENTEDGE ) == Natives.WS_EX_CLIENTEDGE )
                    p.ExStyle ^= Natives.WS_EX_CLIENTEDGE;
                return p;
            }
        }
        #endregion
    }
}