using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Net;
using System.Windows.Forms;
using System.Threading;
using System.IO;
using HttpWebCrawler;

namespace HttpWebCrawlerForm
{
    public partial class HttpWebCrawlerForm : Form
    {
        private Thread crawlerThread;

        private ImageContentAnalysisForm contentAnalysisGUI;

        private Boolean displayImageContent = false;

        private int imageListPositionDisplay = 0;

        private ImageForm imageForm;

        private void crawlButton_Click(object sender, EventArgs e)
        {
            // Initialize the event handler        
            WebPage.UpdateImageURLListEvent += new updateImageURLListDelegate(updateImageURLList);
            WebPage.UpdateSiteURLListEvent += new updateSiteURLListDelegate(updateSiteURLList);

            crawlerThread = new Thread(new ParameterizedThreadStart(WebPage.GetAllPagesUnder));

            string startURL = urlEdit.Text;
            if (startURL != null)
            {
                crawlerThread.Start(new Uri(startURL));
            }
        }

        private void contentAnalysisButton_Click(object sender, EventArgs e)
        {
            if (contentAnalysisGUI.IsDisposed)
            {
                contentAnalysisGUI = new ImageContentAnalysisForm(this);
                contentAnalysisGUI.Visible = true;
            }
            else if (!contentAnalysisGUI.Visible)
                contentAnalysisGUI.Show();
        }

        private void HttpWebCrawlerForm_FormClosed(object sender, FormClosedEventArgs e)
        {
            if (crawlerThread != null)
                crawlerThread.Abort();

            Application.Exit();
        }

        private void updateImageURLList(string imageURL, Image image, int imageCount)
        {
            imageCountLabel.Text = "image count " + imageCount;
            imageURLListBox.Items.Add(imageURL);

            if (displayImageContent)
                displayImage(imageURL, image, imageCount);
        }

        private void updateSiteURLList(string url)
        {
            siteURLListBox.Items.Add(url);
        }

   /*     private void displayImageContent()
        {
            // Displays the content of each image taken from the imageURLListBox control
            imageListPositionDisplay = 0;

            while (imageURLListBox.Items.Count == 0) { }

            while (true)
            {
                while (imageListPositionDisplay >= imageURLListBox.Items.Count) { }

                lock (this)
                    while ((displayContentThreadPaused) || (imageForm.IsDisposed))
                        Monitor.Wait(this);        
                
                // Display images found by crawler
                string imageURL = (string)imageURLListBox.Items[imageListPositionDisplay];
                displayImage(imageURL);
            }
        }  */

        private void displayImage(string url, Image image, int imageCount)
        {
            int width = image.Width;
            int height = image.Height;
            if (!imageForm.IsDisposed)
            {
                imageForm.ImageURL = "Image:" + imageCount + " URL:" + url + "  " + width + " x " + height;
                imageForm.ImageFormPictureBox.Image = image;
            }
        }

        public Boolean DisplayImageContent
        {
            get { return displayImageContent; }

            set { displayImageContent = value; }
        }


        public ImageForm ImageForm
        {
            get { return imageForm; }

            set { imageForm = value; }
        }

        
        public HttpWebCrawlerForm()
        {
            InitializeComponent();

            urlEdit.Text = "http://www.eee.bham.ac.uk/spannm/links.htm";

            contentAnalysisGUI = new ImageContentAnalysisForm(this);

            imageForm = new ImageForm();

        }
        
    }
}