/*

* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

package com.nokia.carbide.internal.discovery.ui.extension;

import java.net.MalformedURLException;

import java.net.URL;

import java.text.MessageFormat;

import java.util.LinkedHashSet;

import java.util.Set;

import org.eclipse.jface.action.Action;

import org.eclipse.jface.action.IAction;

import org.eclipse.jface.action.IStatusLineManager;

import org.eclipse.jface.dialogs.Dialog;

import org.eclipse.jface.dialogs.IInputValidator;

import org.eclipse.jface.dialogs.InputDialog;

import org.eclipse.swt.SWT;

import org.eclipse.swt.browser.Browser;

import org.eclipse.swt.browser.LocationAdapter;

import org.eclipse.swt.browser.LocationEvent;

import org.eclipse.swt.browser.OpenWindowListener;

import org.eclipse.swt.browser.ProgressAdapter;

import org.eclipse.swt.browser.ProgressEvent;

import org.eclipse.swt.browser.StatusTextEvent;

import org.eclipse.swt.browser.StatusTextListener;

import org.eclipse.swt.browser.WindowEvent;

import org.eclipse.swt.layout.FillLayout;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Control;

import org.eclipse.ui.IEditorPart;

import com.nokia.carbide.discovery.ui.Activator;

import com.nokia.carbide.discovery.ui.Messages;

import com.nokia.cpp.internal.api.utils.ui.WorkbenchUtils;

public abstract class AbstractBrowserPortalPageLayer implements IPortalPageLayer {

	protected class BrowserAction extends Action {

		public BrowserAction(String text) {

			super(text);

		}

		@Override

		public boolean isEnabled() {

			return browser != null && !actionBar.isLoading();

		}

	}

	protected class NavigationActionBar implements IActionBar {

		private Set<IAction> actions;

		private IActionUIUpdater updater;

		private boolean loading;

		private NavigationActionBar(IActionUIUpdater updater) {

			this.updater = updater;

			actions = makeActions();

		}

		public void hookBrowser() {

			browser.addLocationListener(new LocationAdapter() {

				@Override

				public void changed(LocationEvent event) {

					NavigationActionBar.this.updater.updateAll();

				}

			});

			browser.addProgressListener(new ProgressAdapter() {

				@Override

				public void changed(ProgressEvent event) {

	                if (event.total == 0)

	                    return;

	                setLoading(event.current != event.total);

					NavigationActionBar.this.updater.updateAll();

				}

				@Override

				public void completed(ProgressEvent event) {

					getStatusLineManager().setMessage(null);

					if (!failedConnect && !isValidPage()) {

						displayCannotFindServerPage();

						Activator.logError(Messages.AbstractBrowserPortalPageLayer_URLDisplayError + getURL().toExternalForm(), null);

						failedConnect = true;

					}

					setLoading(false);

					NavigationActionBar.this.updater.updateAll();

				}

			});

			browser.addOpenWindowListener(new OpenWindowListener() {

				@Override

				public void open(WindowEvent event) {

					event.browser = browser;

				}

			});

			browser.addStatusTextListener(new StatusTextListener() {

				@Override

				public void changed(StatusTextEvent event) {

					getStatusLineManager().setMessage(event.text);

				}

			});

		}

		@Override

		public String getTitle() {

			return Messages.AbstractBrowserPortalPage_NavigationTitle;

		}

		@Override

		public IAction[] getActions() {

			return (IAction[]) actions.toArray(new IAction[actions.size()]);

		}

		public void update() {

			updater.updateAll();

		}

		public void setLoading(boolean loading) {

			Activator.setBusyCursor(browser, loading);

			this.loading = loading;

		}

		@Override

		public String[] getHighlightedActionIds() {

			return null;

		}

		public boolean isLoading() {

			return loading;

		}

	}

	protected static final String HTML_BODY_HEADER = "<html><head><title></title><style type=\"text/css\">div.item {font-family : sans-serif; font-size : 12px; margin-bottom : 16px;} div.itemBody {padding-top : 3px; padding-bottom : 3px;} div.itemInfo {background-color : #EEEEEE; color : #333333;} div.feedflare {display: none;} a.itemTitle {font-size : 12px; font-weight : bold;} a.markItemRead {font-size : 10px; color : #333333;}</style></head><body>"; //$NON-NLS-1$

	protected static final String HTML_BODY_FOOTER = "</body></html>"; //$NON-NLS-1$

	protected Browser browser;

	protected NavigationActionBar actionBar;

	private IEditorPart part;

	private boolean failedConnect;

	@Override

	public Control createControl(Composite parent, IEditorPart part) {

		this.part = part;

		Composite composite = new Composite(parent, SWT.NONE);

		composite.setBackground(parent.getDisplay().getSystemColor(SWT.COLOR_WIDGET_BACKGROUND));

		composite.setLayout(new FillLayout());

		try {

			browser = new Browser(composite, SWT.MOZILLA);

		} catch (Throwable e1) {

			try {

				// try creating regular browser

				browser = new Browser(composite, SWT.NONE);

			} catch (Throwable e2) {

				// don't log with Throwable directly because it may display a dialog

				Activator.logError(MessageFormat.format(Messages.AbstractBrowserPortalPageLayer_BrowserCreateError, e2.getMessage()), null);

			}

		}

		return composite;

	}

	protected URL getURL() {

		try {

			return new URL(Activator.getFromServerProperties(getClass().getName()));

		} catch (MalformedURLException e) {

			Activator.logError(Messages.AbstractBrowserPortalPageLayer_BadURLError, e);

		}

		return null;

	}

	@Override

	public void init() {

		if (browser != null) {

			Activator.runInUIThreadWhenProxyDataSet(browser, new Runnable() {

				@Override

				public void run() {

					URL url = getURL();

					if (url != null) {

						setUrl(url.toString());

					}

					actionBar.hookBrowser();

					actionBar.update();

					browser.setFocus();

				}

			});

		}

	}

	@Override

	public IActionBar[] createCommandBars(IEditorPart part, IActionUIUpdater updater) {

		actionBar = new NavigationActionBar(updater);

		return new IActionBar[] {

			actionBar

		};

	}

	@Override

	public void dispose() {

	}

	protected Set<IAction> makeActions() {

		Set<IAction> actions = new LinkedHashSet<IAction>();

		IAction a = new BrowserAction(Messages.AbstractBrowserPortalPage_BackLabel) {

			@Override

			public void run() {

				if (browser != null) {

					browser.back();

				}

			}

			@Override

			public boolean isEnabled() {

				return super.isEnabled() && browser.isBackEnabled();

			}

		};

		actions.add(a);

		a = new BrowserAction(Messages.AbstractBrowserPortalPageLayer_ForwardLabel) {

			@Override

			public void run() {

				if (browser != null) {

					browser.forward();

				}

			}

			@Override

			public boolean isEnabled() {

				return super.isEnabled() && browser.isForwardEnabled();

			}

		};

		actions.add(a);

		a = new BrowserAction(Messages.AbstractBrowserPortalPage_RefreshLabel) {

			@Override

			public void run() {

				if (browser != null) {

					if (browserHasURL())

						browser.refresh();

					else {

						URL url = getURL();

						if (url != null) {

							setUrl(url.toString());

						}

					}

					actionBar.update();

				}

			}

		};

		actions.add(a);

		a = new Action(Messages.AbstractBrowserPortalPage_StopLabel) {

			@Override

			public void run() {

				if (browser != null) {

					browser.stop();

					actionBar.update();

				}

			}

			@Override

			public boolean isEnabled() {

				return browser != null && actionBar.isLoading();

			}

		};

		actions.add(a);

		a = new BrowserAction(Messages.AbstractBrowserPortalPageLayer_ShowInBrowserLabel) {

			public void run() {

				WorkbenchUtils.showWebPageInExternalBrowser(browser.getUrl());

			};

			public boolean isEnabled() {

				return super.isEnabled() && browserHasURL();

			};

		};

		actions.add(a);

		a = new Action(Messages.AbstractBrowserPortalPageLayer_OpenLocationLabel) {

			public void run() {

				InputDialog dlg = new InputDialog(browser.getShell(), 

						Messages.AbstractBrowserPortalPageLayer_OpenLocationTitle, Messages.AbstractBrowserPortalPageLayer_URLLabel, null, new IInputValidator() {

					@Override

					public String isValid(String newText) {

						try {

							new URL(getLocationURL(newText));

						} catch (MalformedURLException e) {

							return Messages.AbstractBrowserPortalPageLayer_InvalidURLError;

						}

						return null;

					}

				});

				int result = dlg.open();

				if (result == Dialog.OK) {

					String value = dlg.getValue();

					setUrl(getLocationURL(value));

					actionBar.update();

				}

			}

			private String getLocationURL(String value) {

				try {

					new URL(value);

				} catch (MalformedURLException e) {

					value = "http://" + value; //$NON-NLS-1$

				}

				return value;

			};

			public boolean isEnabled() {

				return browser != null;

			};

		};

		actions.add(a);

		return actions;

	}

	protected boolean browserHasURL() {

		String url = browser.getUrl();

		return url.matches("^.*://.*"); //$NON-NLS-1$

	}

	protected boolean isValidPage() {

		return browserHasURL();

	}

	protected void setUrl(String url) {

		browser.setUrl(url);

		failedConnect = false;

	}

	protected void displayCannotFindServerPage() {

		StringBuilder sb = new StringBuilder(HTML_BODY_HEADER);

		// if we want, we can add html here for failed connect case

		sb.append(HTML_BODY_FOOTER);

		browser.setText(sb.toString());

		browser.redraw();

	}

	private IStatusLineManager getStatusLineManager() {

		return part.getEditorSite().getActionBars().getStatusLineManager();

	}

}