package net.sf.pim.mail.reader;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;
import java.util.HashMap;

import javax.mail.Header;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Part;

import net.sf.pim.mail.MailUtil;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.layout.GridDataFactory;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.layout.RowData;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.program.Program;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Link;
import org.eclipse.swt.widgets.Menu;
/**
 * @author levin
 * 郵件中contenttype的格式關系
+------------------------- multipart/mixed ----------------------------+
|                                                                      |
|  +----------------- multipart/related ------------------+            |
|  |                                                      |            |
|  |  +----- multipart/alternative ------+  +----------+  |  +------+  |
|  |  |                                  |  | 內嵌資源   |  |  | 附件 |  |
|  |  |  +------------+  +------------+  |  +----------+  |  +------+  |
|  |  |  | 純文本正文 |  | 超文本正文 |  |                    |            |
|  |  |  +------------+  +------------+  |  +----------+  |  +------+  |
|  |  |                                  |  | 內嵌資源   |  |  | 附件 |  |
|  |  +----------------------------------+  +----------+  |  +------+  |
|  |                                                      |            |
|  +------------------------------------------------------+            |
|                                                                      |
+----------------------------------------------------------------------+
 */
public class FileMessageReader extends Composite {

	private Label from;
	private Label to;
	private Label cc;
	private Label subject;
	private Label sent;
	private Composite attachments;
	private Composite main;
	private Browser body;
	Message messageShow;
	
	public FileMessageReader(Composite parent, int style) {
		super(parent, style);
		setLayout(new FillLayout());
		create();
	}
	public void create() {
		main = new Composite(this, SWT.NONE);
		GridLayout layout = new GridLayout();
		layout.numColumns = 2;
		main.setLayout(layout);
		GridDataFactory.fillDefaults().grab(true, true).applyTo(main);
		// 頭區
		Font boldFont = JFaceResources.getFontRegistry().getBold(JFaceResources.DEFAULT_FONT);
		Label l = new Label(main, SWT.WRAP);
		l.setText("發件人:");
		l.setFont(boldFont);
		l.addMouseListener(new MouseAdapter(){
			public void mouseDoubleClick(MouseEvent e) {
				if(messageShow != null){
					try {
						StringBuffer sb=new StringBuffer();
						Enumeration em = messageShow.getAllHeaders();
						while (em.hasMoreElements()){
							Header header=(Header) em.nextElement();
							sb.append(header.getName()).append(":").append(header.getValue()).append("\n");
						}
						MessageDialog.openInformation(FileMessageReader.this.getShell(), "郵件頭信息", sb.toString());
					} catch (MessagingException e1) {
						e1.printStackTrace();
					}
				}
			}
		});
		from = new Label(main, SWT.NONE);
		from.setText("<from>");

		l = new Label(main, SWT.WRAP);
		l.setText("收件人:");
		l.setFont(boldFont);
		to = new Label(main, SWT.WRAP);
		to.setText("<to>");

		l = new Label(main, SWT.WRAP);
		l.setText("抄送:");
		l.setFont(boldFont);
		cc = new Label(main, SWT.WRAP);
		cc.setText("<cc>");
		
		l = new Label(main, SWT.WRAP);
		l.setText("接收時間:");
		l.setFont(boldFont);
		sent = new Label(main, SWT.WRAP);
		sent.setText("<send date>");

		l = new Label(main, SWT.WRAP);
		l.setText("主題:");
		l.setFont(boldFont);
		subject = new Label(main, SWT.WRAP);
		subject.setText("<subject>");

		l = new Label(main, SWT.WRAP);
		GridDataFactory.fillDefaults().align(SWT.BEGINNING, SWT.TOP).applyTo(l);
		l.setText("附件:");
		l.setFont(boldFont);
		attachments=new Composite(main,SWT.NULL);
		//設置layoutdata很關鍵，讓它在vertical上自動
		GridDataFactory.fillDefaults().grab(true, false).applyTo(attachments);
		RowLayout rowLayout = new RowLayout();
		rowLayout.spacing=8;
		attachments.setLayout(rowLayout);

		body = new Browser(main, SWT.WRAP | SWT.READ_ONLY);
		//禁止鼠標右鍵的菜單,設置一個空的POP_UP菜單
		Menu menu = new Menu(body.getShell(), SWT.POP_UP);
		body.setMenu(menu);		
		GridData gridData = new GridData(GridData.FILL_BOTH);
		gridData.horizontalSpan=2;
		body.setLayoutData(gridData);
		body.setText("<無郵件>");
	}

	public void showMessage(Message msg) throws MessagingException {
		this.messageShow =msg;
		from.setText(MailUtil.getAddress(msg.getFrom()));
		MailUtil.resetSize(from);
		to.setText(MailUtil.getAddress(msg.getRecipients(Message.RecipientType.TO)));
		MailUtil.resetSize(to);
		cc.setText(MailUtil.getAddress(msg.getRecipients(Message.RecipientType.CC)));
		MailUtil.resetSize(cc);
		sent.setText(MailUtil.getSentTime(msg));
		MailUtil.resetSize(sent);
		subject.setText(msg.getSubject() == null ?"":msg.getSubject());
		MailUtil.resetSize(subject);
		try {
			//附件
			final HashMap<String,Part> atts=new HashMap<String, Part>();
			MailUtil.dumpPart(msg, atts);
			//清除以前
			for(Control c:attachments.getChildren())
				c.dispose();
			for(final String f:atts.keySet()){
				Composite composite=new Composite(attachments,SWT.FLAT);
				RowLayout rowLayout = new RowLayout();
				rowLayout.wrap=false;
				rowLayout.spacing=0;
				composite.setLayout(rowLayout);
				Image image=MailUtil.getImage(f);
				Label label=new Label(composite,SWT.NULL);
				if(image != null){
					label.setImage(image);
				}
				Link link=new Link(composite,SWT.NULL);
				link.setText("<a>"+f+"</a>");
				link.addSelectionListener(new SelectionAdapter(){
					public void widgetSelected(SelectionEvent e) {
						//點擊附件進行顯示
			            Thread th = new Thread(new AttachmentViewer(f,atts.get(f)));
			            th.start();
					}
				});
				composite.setLayoutData(new RowData(composite.computeSize(SWT.DEFAULT, SWT.DEFAULT)));
			}
			//重新設置附件區的大小
			MailUtil.resetSize(attachments);
			//正文
			Object messageBody = getMessageBody(msg);
			if(messageBody instanceof String) {
				body.setText((String) messageBody);
			}else if(messageBody instanceof URL){
				body.setUrl(((URL)messageBody).toString());
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		main.layout();
	}
	//取郵件體
	protected Object getMessageBody(Part msg) throws MessagingException, IOException {
		String body="無法識別的的郵件";
		//投機一下，直接用ie的mht規范顯示郵件，先不考慮附件的優化
		if(msg.getHeader("FILE_FULL_NAME") != null){
			return new File(msg.getHeader("FILE_FULL_NAME")[0]).toURL();
		}
		return body;
	}
	
	//顯示附件
    class AttachmentViewer implements Runnable {
		String cmd;

		Part p;

		public AttachmentViewer(String file, Part part) {
			cmd = file;
			p = part;
		}

		public void run() {
			try {
				// Simply ask windows to open the file in a command shell.
				// Windows will then open the file in whatever way it
				// usually does or ask the user how to open it.
				String str = System.getProperty("java.io.tmpdir") + cmd;
				MailUtil.copyIntput2Output(p.getInputStream(), new FileOutputStream(str));
				Program.launch(str);
//				String theCmd = "cmd /c \"start \"\" \"" + str + "\"\"";
//				Runtime.getRuntime().exec(theCmd);
			} catch (Exception ex) {
				ex.printStackTrace();
			}
		}
	}

	public Message getMessageShow() {
		return messageShow;
	}
	public void setMessageShow(Message messageShow) {
		this.messageShow = messageShow;
	}    
}