using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Media;
using MahTweets.Mobile.Core.Extensions;

namespace MahTweets.Mobile.Controls
{
    public class HighlightingTextBlock : ContentControl
    {
        public static readonly DependencyProperty HighlightBrushProperty = DependencyProperty.Register(
            "HighlightBrush", typeof (Brush), typeof (HighlightingTextBlock), new PropertyMetadata(null, null));

        public static readonly DependencyProperty TextProperty = DependencyProperty.Register("Text", typeof (string),
                                                                                             typeof (
                                                                                                 HighlightingTextBlock),
                                                                                             new PropertyMetadata(
                                                                                                 OnTextPropertyChanged));

        public static readonly DependencyProperty ContactNameProperty = DependencyProperty.Register("ContactName", typeof(string),
                                                                                             typeof(
                                                                                                 HighlightingTextBlock),
                                                                                             new PropertyMetadata(
                                                                                                 OnTextPropertyChanged));

        public HighlightingTextBlock()
        {
            DefaultStyleKey = typeof (HighlightingTextBlock);
            TextBlock = new TextBlock {TextWrapping = TextWrapping.Wrap};
            //Wrap textblock in a border so this control respects background colour
            var border = new Border
                              {
                                  Child = TextBlock,
                                  Padding = new Thickness(5,0,5,0)
                              };
            border.SetBinding(Border.BackgroundProperty, new Binding("Background") {Source = this});
            Content = border;
        }

        public Brush HighlightBrush
        {
            get { return GetValue(HighlightBrushProperty) as Brush; }
            set { SetValue(HighlightBrushProperty, value); }
        }

        public string Text
        {
            get { return GetValue(TextProperty) as string; }
            set { SetValue(TextProperty, value); }
        }

        public string ContactName
        {
            get { return GetValue(ContactNameProperty) as string; }
            set { SetValue(ContactNameProperty, value); }
        }


        private TextBlock TextBlock { get; set; }

        private List<Inline> Inlines { get; set; }

        private static void OnTextPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var source = (HighlightingTextBlock)d;

            if (source.TextBlock == null) return;

            while (source.TextBlock.Inlines.Count > 0)
            {
                source.TextBlock.Inlines.RemoveAt(0);
            }
            source.TextBlock.Text = String.Empty;

                
            var value = e.NewValue as string;
            source.Inlines = new List<Inline>();

            if (!String.IsNullOrEmpty(source.ContactName))
            {
                Inline run = new Run
                                 {
                                     Text = source.ContactName + " ",
                                     Foreground = source.HighlightBrush,
                                     FontWeight = FontWeights.Bold
                                 };
                source.TextBlock.Inlines.Add(run);
                source.Inlines.Add(run);
            }

            if (value != null)
            {
                string[] words = value.Split(' ');

                foreach (string word in words)
                {
                    Inline run = new Run {Text = word + " "};
                    if (word.ContainsHyperlink())
                    {
                        run.Foreground = source.HighlightBrush;
                    }
                    else if ((word.StartsWith("@") || word.StartsWith(".@") || word.StartsWith("-@") ||
                              word.StartsWith("r@") || word.StartsWith("rt@")) && word != "@")
                    {
                        run.Foreground = source.HighlightBrush;
                    }
                    else if (word.StartsWith("#") && word != "#")
                    {
                        run.Foreground = source.HighlightBrush;
                    }

                    source.TextBlock.Inlines.Add(run);
                    source.Inlines.Add(run);
                }
            }
        }
    }
}