using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace Help
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        string searchSavedHtml = string.Empty;
        int searchLastType = -1;

        public MainWindow()
        {
            InitializeComponent();

            PopulateChapters();
            if (HelpSystem.HelpManager.Chapters.Count != 0)
                PopulateTopics();

            // Check for errors, exceptions
            if (Application.Current.Properties.Contains("ERROR"))
            {
                var ex = Application.Current.Properties["ERROR"] as Exception;
                if (ex != null) MessageBox.Show(ex.Message, "Could not load the help documents.", MessageBoxButton.OK, MessageBoxImage.Error);
            }

            // Check for arguments
            if (Application.Current.Properties.Contains("APPLICATION"))
                SetApplication(Application.Current.Properties["APPLICATION"].ToString());
        }

        public void SetApplication(string application)
        {
            int item = HelpSystem.HelpManager.Chapters.FindIndex(x => x.Application == application);
            if (item != -1) this.listChapters.SelectedItem = HelpSystem.HelpManager.Chapters[item];
        }

        #region Populate routines

        public void PopulateChapters()
        {
            foreach (var i in HelpSystem.HelpManager.Chapters)
                listChapters.Items.Add(i);

            listChapters.SelectedIndex = 0;
        }

        public void PopulateTopics()
        {
            var chapter = listChapters.SelectedItem as HelpSystem.HelpChapter;
            if (chapter == null) return;

            this.listTopics.Items.Clear();

            // Populate
            foreach (var i in chapter.Topics)
                listTopics.Items.Add(i);
        }

        public void PopulateTopics(IEnumerable<HelpSystem.HelpTopic> topics)
        {
            this.listTopics.Items.Clear();
            foreach (var i in topics) listTopics.Items.Add(i);
        }

        #endregion

        #region User input

        private void Button_IsEnabledChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            Button b = sender as Button;
            if (b == null) return;

            b.Opacity = (b.IsEnabled) ? 1.0 : .5;
        }

        #region Search function

        private void bSearchOptions_Click(object sender, RoutedEventArgs e)
        {
            bSearchOptions.ContextMenu.IsOpen = true;
        }

        private void bSearchHandler()
        {
            if (textSearch.Text == "") return;

            // Hide search button, and show clear button
            bClear.Visibility = System.Windows.Visibility.Visible;
            bSearch.Visibility = System.Windows.Visibility.Collapsed;

            // Clear previous searches
            if (searchLastType != -1) clearSearchCommon();

            // Search title only
            if (searchTitleOnly.IsChecked.HasValue && searchTitleOnly.IsChecked.Value)
            {
                var temp = listChapters.SelectedItem as HelpSystem.HelpChapter;
                if (temp == null) return;

                listTopics.Items.Clear();

                PopulateTopics(HelpSystem.HelpManager.SearchTitle(textSearch.Text, temp));
            }

            else if (searchContent.IsChecked.HasValue && searchContent.IsChecked.Value)
            {
                var temp = listChapters.SelectedItem as HelpSystem.HelpChapter;
                if (temp == null) return;

                listTopics.Items.Clear();

                PopulateTopics(HelpSystem.HelpManager.SearchText(textSearch.Text, temp));
            }

            else if (searchPage.IsChecked.HasValue && searchPage.IsChecked.Value)
            {
                searchSavedHtml = HelpSystem.HelpHtmlWrapper.GetHtml(webBrowser.Document);
                HelpSystem.HelpHtmlWrapper.Find(webBrowser.Document, textSearch.Text);
                searchLastType = 3;
            }

        }

        private void clearSearchCommon()
        {
            if (searchLastType == 3) HelpSystem.HelpHtmlWrapper.SetHtml(webBrowser.Document, searchSavedHtml);
            else PopulateTopics();

            searchLastType = -1;
        }

        private void bClear_Click(object sender, RoutedEventArgs e)
        {
            bClear.Visibility = System.Windows.Visibility.Collapsed;
            bSearch.Visibility = System.Windows.Visibility.Visible;
            textSearch.Clear();

            clearSearchCommon();
        }

        private void bSearch_Click(object sender, RoutedEventArgs e)
        {
            bSearchHandler();
        }

        private void textSearch_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Return)
            {
                e.Handled = true;
                bSearchHandler();
            }
        }

        #endregion

        #region Web Browser
        private void bBrowseBack_Click(object sender, RoutedEventArgs e)
        {
            webBrowser.GoBack();
        }

        private void bBrowseForward_Click(object sender, RoutedEventArgs e)
        {
            webBrowser.GoForward();
        }

        private void bBrowseHome_Click(object sender, RoutedEventArgs e)
        {
            var item = listChapters.SelectedItem as HelpSystem.HelpChapter;
            if (item != null) webBrowser.Navigate(new Uri(HelpSystem.HelpManager.GetFullPath(item.Filename)));
        }

        private void webBrowser_Navigated(object sender, System.Windows.Navigation.NavigationEventArgs e)
        {
            if (searchLastType == 3) bClear_Click(this, new RoutedEventArgs());

            bBrowseBack.IsEnabled = webBrowser.CanGoBack;
            bBrowseForward.IsEnabled = webBrowser.CanGoForward;
        }

        #endregion

        #region Navigation
        private void listTopics_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var sel = listTopics.SelectedItem as HelpSystem.HelpTopic;
            if (sel != null) webBrowser.Navigate(new Uri(HelpSystem.HelpManager.GetFullPath(sel.Filename)));
        }

        private void listChapters_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var sel = listChapters.SelectedItem as HelpSystem.HelpChapter;
            if (sel != null)
            {
                webBrowser.Navigate(new Uri(HelpSystem.HelpManager.GetFullPath(sel.Filename)));
                PopulateTopics();
            }
        }
        #endregion

        #endregion
    }
}