/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.printing;

import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.cocoa.*;

/**
 * Instances of this class are used to print to a printer.
 * Applications create a GC on a printer using <code>new GC(printer)</code>
 * and then draw on the printer GC using the usual graphics calls.
 * <p>
 * A <code>Printer</code> object may be constructed by providing
 * a <code>PrinterData</code> object which identifies the printer.
 * A <code>PrintDialog</code> presents a print dialog to the user
 * and returns an initialized instance of <code>PrinterData</code>.
 * Alternatively, calling <code>new Printer()</code> will construct a
 * printer object for the user's default printer.
 * </p><p>
 * Application code must explicitly invoke the <code>Printer.dispose()</code> 
 * method to release the operating system resources managed by each instance
 * when those instances are no longer required.
 * </p>
 *
 * @see PrinterData
 * @see PrintDialog
 * @see <a href="http://www.eclipse.org/swt/snippets/#printing">Printing snippets</a>
 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
 */
public final class Printer extends Device {
	PrinterData data;
	NSPrinter printer;
	boolean inPage, isGCCreated;

	static final String DRIVER = "Mac";
	static final String PRINTER_DRIVER = "Printer";
	static final String FILE_DRIVER = "File";
	static final String PREVIEW_DRIVER = "Preview";
	static final String FAX_DRIVER = "Fax";

/**
 * Returns an array of <code>PrinterData</code> objects
 * representing all available printers.
 *
 * @return the list of available printers
 */
public static PrinterData[] getPrinterList() {
	NSArray printers = NSPrinter.printerNames();
	int count = printers.count();
	PrinterData[] result = new PrinterData[count];
	for (int i = 0; i < count; i++) {
		NSString str = new NSString(printers.objectAtIndex(i));
		char[] buffer = new char[str.length()];
		str.getCharacters_(buffer);
		result[i] = new PrinterData(DRIVER, new String(buffer));
	}
	return result;
}

/**
 * Returns a <code>PrinterData</code> object representing
 * the default printer or <code>null</code> if there is no 
 * printer available on the System.
 *
 * @return the default printer data or null
 * 
 * @since 2.1
 */
public static PrinterData getDefaultPrinterData() {
	//TODO - get default
	PrinterData[] printers = getPrinterList();
	if (printers.length > 0) return printers[0];
	return null;
}
//static int packData(int handle, byte[] buffer, int offset) {
//	int length = OS.GetHandleSize (handle);
//	buffer[offset++] = (byte)((length & 0xFF) >> 0);
//	buffer[offset++] = (byte)((length & 0xFF00) >> 8);
//	buffer[offset++] = (byte)((length & 0xFF0000) >> 16);
//	buffer[offset++] = (byte)((length & 0xFF000000) >> 24);
//	int [] ptr = new int [1];
//	OS.HLock(handle);
//	OS.memmove(ptr, handle, 4);
//	byte[] buffer1 = new byte[length];
//	OS.memmove(buffer1, ptr [0], length);
//	OS.HUnlock(handle);
//	System.arraycopy(buffer1, 0, buffer, offset, length);
//	return offset + length;
//}
//static int unpackData(int[] handle, byte[] buffer, int offset) {
//	int length = 
//		((buffer[offset++] & 0xFF) << 0) |
//		((buffer[offset++] & 0xFF) << 8) |
//		((buffer[offset++] & 0xFF) << 16) |
//		((buffer[offset++] & 0xFF) << 24);
//	handle[0] = OS.NewHandle(length);
//	if (handle[0] == 0) SWT.error(SWT.ERROR_NO_HANDLES);
//	int[] ptr = new int[1];
//	OS.HLock(handle[0]);
//	OS.memmove(ptr, handle[0], 4);
//	byte[] buffer1 = new byte[length];
//	System.arraycopy(buffer, offset, buffer1, 0, length);
//	OS.memmove(ptr[0], buffer1, length);
//	OS.HUnlock(handle[0]);
//	return offset + length;
//}

/**
 * Constructs a new printer representing the default printer.
 * <p>
 * You must dispose the printer when it is no longer required. 
 * </p>
 *
 * @exception SWTError <ul>
 *    <li>ERROR_NO_HANDLES - if there are no valid printers
 * </ul>
 *
 * @see Device#dispose
 */
public Printer() {
	this(null);
}

/**
 * Constructs a new printer given a <code>PrinterData</code>
 * object representing the desired printer.
 * <p>
 * You must dispose the printer when it is no longer required. 
 * </p>
 *
 * @param data the printer data for the specified printer
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the specified printer data does not represent a valid printer
 * </ul>
 * @exception SWTError <ul>
 *    <li>ERROR_NO_HANDLES - if there are no valid printers
 * </ul>
 *
 * @see Device#dispose
 */
public Printer(PrinterData data) {
	super (checkNull(data));
}

/**
 * Given a <em>client area</em> (as described by the arguments),
 * returns a rectangle, relative to the client area's coordinates,
 * that is the client area expanded by the printer's trim (or minimum margins).
 * <p>
 * Most printers have a minimum margin on each edge of the paper where the
 * printer device is unable to print.  This margin is known as the "trim."
 * This method can be used to calculate the printer's minimum margins
 * by passing in a client area of 0, 0, 0, 0 and then using the resulting
 * x and y coordinates (which will be <= 0) to determine the minimum margins
 * for the top and left edges of the paper, and the resulting width and height
 * (offset by the resulting x and y) to determine the minimum margins for the
 * bottom and right edges of the paper, as follows:
 * <ul>
 * 		<li>The left trim width is -x pixels</li>
 * 		<li>The top trim height is -y pixels</li>
 * 		<li>The right trim width is (x + width) pixels</li>
 * 		<li>The bottom trim height is (y + height) pixels</li>
 * </ul>
 * </p>
 * 
 * @param x the x coordinate of the client area
 * @param y the y coordinate of the client area
 * @param width the width of the client area
 * @param height the height of the client area
 * @return a rectangle, relative to the client area's coordinates, that is
 * 		the client area expanded by the printer's trim (or minimum margins)
 *
 * @exception SWTException <ul>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @see #getBounds
 * @see #getClientArea
 */
public Rectangle computeTrim(int x, int y, int width, int height) {
	checkDevice();
//	PMRect pageRect = new PMRect();
//	PMRect paperRect = new PMRect();
//	OS.PMGetAdjustedPageRect(pageFormat, pageRect);
//	OS.PMGetAdjustedPaperRect(pageFormat, paperRect);
//	return new Rectangle(x+(int)paperRect.left, y+(int)paperRect.top, width+(int)(paperRect.right-pageRect.right), height+(int)(paperRect.bottom-pageRect.bottom));
	return null;
}

/**	 
 * Creates the printer handle.
 * This method is called internally by the instance creation
 * mechanism of the <code>Device</code> class.
 * @param deviceData the device data
 */
protected void create(DeviceData deviceData) {
	data = (PrinterData)deviceData;
	
	printer = NSPrinter.static_printerWithName_(NSString.stringWith(data.name));
	printer.retain();
	
//	int[] buffer = new int[1];
//	if (OS.PMCreateSession(buffer) != OS.noErr) SWT.error(SWT.ERROR_NO_HANDLES);
//	printSession = buffer[0];
//	if (printSession == 0) SWT.error(SWT.ERROR_NO_HANDLES);
//		
//	if (data.otherData != null) {
//		/* Deserialize settings */
//		int offset = 0;
//		byte[] otherData = data.otherData;
//		offset = unpackData(buffer, otherData, offset);
//		int flatSettings = buffer[0];
//		offset = unpackData(buffer, otherData, offset);
//		int flatFormat = buffer[0];
//		if (OS.PMUnflattenPrintSettings(flatSettings, buffer) != OS.noErr) SWT.error(SWT.ERROR_NO_HANDLES);
//		printSettings = buffer[0];
//		if (printSettings == 0) SWT.error(SWT.ERROR_NO_HANDLES);
//		if (OS.PMUnflattenPageFormat(flatFormat, buffer) != OS.noErr) SWT.error(SWT.ERROR_NO_HANDLES);
//		pageFormat = buffer[0];
//		if (pageFormat == 0) SWT.error(SWT.ERROR_NO_HANDLES);
//		OS.DisposeHandle(flatSettings);
//		OS.DisposeHandle(flatFormat);
//	} else {
//		/* Create default settings */
//		if (OS.PMCreatePrintSettings(buffer) != OS.noErr) SWT.error(SWT.ERROR_NO_HANDLES);
//		printSettings = buffer[0];
//		if (printSettings == 0) SWT.error(SWT.ERROR_NO_HANDLES);
//		OS.PMSessionDefaultPrintSettings(printSession, printSettings);
//		if (OS.PMCreatePageFormat(buffer) != OS.noErr) SWT.error(SWT.ERROR_NO_HANDLES);
//		pageFormat = buffer[0];
//		if (pageFormat == 0) SWT.error(SWT.ERROR_NO_HANDLES);
//		OS.PMSessionDefaultPageFormat(printSession, pageFormat);
//	}
//	
//	if (PREVIEW_DRIVER.equals(data.driver)) {
//		OS.PMSessionSetDestination(printSession, printSettings, (short) OS.kPMDestinationPreview, 0, 0);
//	}
//	String name = data.name;
//	char[] buffer1 = new char[name.length ()];
//	name.getChars(0, buffer1.length, buffer1, 0);
//	int ptr = OS.CFStringCreateWithCharacters(OS.kCFAllocatorDefault, buffer1, buffer1.length);
//	if (ptr != 0) {
//		OS.PMSessionSetCurrentPrinter(printSession, ptr); 
//		OS.CFRelease(ptr);
//	}
//	
//	OS.PMSessionValidatePrintSettings(printSession, printSettings, null);
//	OS.PMSessionValidatePageFormat(printSession, pageFormat, null);	
//	
//	int graphicsContextsArray = OS.CFArrayCreateMutable(OS.kCFAllocatorDefault, 1, 0);
//	if (graphicsContextsArray != 0) {
//		OS.CFArrayAppendValue(graphicsContextsArray, OS.kPMGraphicsContextCoreGraphics());
//		OS.PMSessionSetDocumentFormatGeneration(printSession, OS.kPMDocumentFormatPDF(), graphicsContextsArray, 0);
//		OS.CFRelease(graphicsContextsArray);
//	}
}

/**	 
 * Destroys the printer handle.
 * This method is called internally by the dispose
 * mechanism of the <code>Device</code> class.
 */
protected void destroy() {
	if (printer != null) printer.release();
	printer = null;
}

/**	 
 * Invokes platform specific functionality to allocate a new GC handle.
 * <p>
 * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
 * API for <code>Printer</code>. It is marked public only so that it
 * can be shared within the packages provided by SWT. It is not
 * available on all platforms, and should never be called from
 * application code.
 * </p>
 *
 * @param data the platform specific GC data 
 * @return the platform specific GC handle
 */
public int internal_new_GC(GCData data) {
	if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	setupNewPage();
//	if (data != null) {
//		if (isGCCreated) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
//		data.device = this;
//		data.background = getSystemColor(SWT.COLOR_WHITE).handle;
//		data.foreground = getSystemColor(SWT.COLOR_BLACK).handle;
//		data.font = getSystemFont ();
//		PMRect paperRect= new PMRect();
//		OS.PMGetAdjustedPaperRect(pageFormat, paperRect);
//		Rect portRect = new Rect();
//		portRect.left = (short)paperRect.left;
//		portRect.right = (short)paperRect.right;
//		portRect.top = (short)paperRect.top;
//		portRect.bottom = (short)paperRect.bottom;
//		data.portRect = portRect;
//		isGCCreated = true;
//	}
//	return context;
	return 0;
}

protected void init () {
	super.init();
}

/**	 
 * Invokes platform specific functionality to dispose a GC handle.
 * <p>
 * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
 * API for <code>Printer</code>. It is marked public only so that it
 * can be shared within the packages provided by SWT. It is not
 * available on all platforms, and should never be called from
 * application code.
 * </p>
 *
 * @param hDC the platform specific GC handle
 * @param data the platform specific GC data 
 */
public void internal_dispose_GC(int context, GCData data) {
	if (data != null) isGCCreated = false;
}

/**	 
 * Releases any internal state prior to destroying this printer.
 * This method is called internally by the dispose
 * mechanism of the <code>Device</code> class.
 */
protected void release () {
	super.release();
}

/**
 * Starts a print job and returns true if the job started successfully
 * and false otherwise.
 * <p>
 * This must be the first method called to initiate a print job,
 * followed by any number of startPage/endPage calls, followed by
 * endJob. Calling startPage, endPage, or endJob before startJob
 * will result in undefined behavior.
 * </p>
 * 
 * @param jobName the name of the print job to start
 * @return true if the job started successfully and false otherwise.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @see #startPage
 * @see #endPage
 * @see #endJob
 */
public boolean startJob(String jobName) {
	checkDevice();
//	if (jobName != null && jobName.length() != 0) {
//		char[] buffer = new char[jobName.length ()];
//		jobName.getChars(0, buffer.length, buffer, 0);
//		int ptr = OS.CFStringCreateWithCharacters(OS.kCFAllocatorDefault, buffer, buffer.length);
//		if (ptr != 0) {
//			OS.PMSetJobNameCFString(printSettings, ptr); 
//			OS.CFRelease (ptr);
//		}
//	}
//	return OS.PMSessionBeginDocumentNoDialog(printSession, printSettings, pageFormat) == OS.noErr;
	return false;
}

/**
 * Ends the current print job.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @see #startJob
 * @see #startPage
 * @see #endPage
 */
public void endJob() {
	checkDevice();
//	if (inPage) {
//		OS.PMSessionEndPageNoDialog(printSession);
//		inPage = false;
//	}
//	OS.PMSessionEndDocumentNoDialog(printSession);
//	context = 0;
}

/**
 * Cancels a print job in progress. 
 *
 * @exception SWTException <ul>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void cancelJob() {
	checkDevice();
//	OS.PMSessionSetError(printSession, OS.kPMCancel);
//	if (inPage) {
//		OS.PMSessionEndPageNoDialog(printSession);
//		inPage = false;
//	}
//	OS.PMSessionEndDocumentNoDialog(printSession);
//	context = 0;
}

static DeviceData checkNull (PrinterData data) {
	if (data == null) data = new PrinterData();
	if (data.driver == null || data.name == null) {
		PrinterData defaultPrinter = getDefaultPrinterData();
		if (defaultPrinter == null) SWT.error(SWT.ERROR_NO_HANDLES);
		data.driver = defaultPrinter.driver;
		data.name = defaultPrinter.name;		
	}
	return data;
}

/**
 * Starts a page and returns true if the page started successfully
 * and false otherwise.
 * <p>
 * After calling startJob, this method may be called any number of times
 * along with a matching endPage.
 * </p>
 * 
 * @return true if the page started successfully and false otherwise.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @see #endPage
 * @see #startJob
 * @see #endJob
 */
public boolean startPage() {
	checkDevice();
//	if (OS.PMSessionError(printSession) != OS.noErr) return false;
//	setupNewPage();
//	return context != 0;
	return false;
}

/**
 * Ends the current page.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @see #startPage
 * @see #startJob
 * @see #endJob
 */
public void endPage() {
	checkDevice();
//	if (inPage) {
//		OS.PMSessionEndPageNoDialog(printSession);
//		inPage = false;
//	}
}

/**
 * Returns a point whose x coordinate is the horizontal
 * dots per inch of the printer, and whose y coordinate
 * is the vertical dots per inch of the printer.
 *
 * @return the horizontal and vertical DPI
 *
 * @exception SWTException <ul>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public Point getDPI() {
	checkDevice();
//	PMResolution resolution = new PMResolution();
//	OS.PMGetResolution(pageFormat, resolution);
//	return new Point((int)resolution.hRes, (int)resolution.vRes);
	return null;
}

/**
 * Returns a rectangle describing the receiver's size and location.
 * <p>
 * For a printer, this is the size of the physical page, in pixels.
 * </p>
 *
 * @return the bounding rectangle
 *
 * @exception SWTException <ul>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @see #getClientArea
 * @see #computeTrim
 */
public Rectangle getBounds() {
	checkDevice();
//	PMRect paperRect = new PMRect();
//	OS.PMGetAdjustedPaperRect(pageFormat, paperRect);
//	return new Rectangle(0, 0, (int)(paperRect.right-paperRect.left), (int)(paperRect.bottom-paperRect.top));
	return null;
}

/**
 * Returns a rectangle which describes the area of the
 * receiver which is capable of displaying data.
 * <p>
 * For a printer, this is the size of the printable area
 * of the page, in pixels.
 * </p>
 * 
 * @return the client area
 *
 * @exception SWTException <ul>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @see #getBounds
 * @see #computeTrim
 */
public Rectangle getClientArea() {
	checkDevice();
//	PMRect pageRect = new PMRect();
//	OS.PMGetAdjustedPageRect(pageFormat, pageRect);
//	return new Rectangle(0, 0, (int)(pageRect.right-pageRect.left), (int)(pageRect.bottom-pageRect.top));
	return null;
}

/**
 * Returns a <code>PrinterData</code> object representing the
 * target printer for this print job.
 * 
 * @return a PrinterData object describing the receiver
 */
public PrinterData getPrinterData() {
	checkDevice();
	return data;
}

/**
 * On the Mac the core graphics context for printing is only valid between PMSessionBeginPage and PMSessionEndPage,
 * so printing code has to retrieve and initializes a graphic context for every page like this:
 * 
 * <pre>
 * PMSessionBeginDocument
 *    PMSessionBeginPage
 * 	     PMSessionGetGraphicsContext
 * 		 // ... use context
 *    PMSessionEndPage
 * PMSessionEndDocument
 * </pre>
 * 
 * In SWT it is OK to create a GC once between startJob / endJob and use it for all pages in between:
 * 
 * <pre>
 * startJob(...);
 * 	  GC gc= new GC(printer);
 *    startPage();
 * 		 // ... use gc
 *    endPage();
 *    gc.dispose();
 * endJob();
 * </pre>
 * 
 * The solution to resolve this difference is to rely on the fact that Mac OS X returns the same but
 * reinitialized graphics context for every page. So we only have to account for the fact that SWT assumes
 * that the graphics context keeps it settings across a page break when it actually does not.
 * So we have to copy some settings that exist in the CGC before a PMSessionEndPage to the CGC after a PMSessionBeginPage.
 * <p>
 * In addition to this we have to cope with the situation that in SWT we can create a GC before a call to
 * PMSessionBeginPage. For this we decouple the call to PMSessionBeginPage from
 * SWT's method startPage as follows: if a new GC is created before a call to startPage, internal_new_GC
 * does the PMSessionBeginPage and the next following startPage does nothing.
 * </p>
 */
void setupNewPage() {
//	if (!inPage) {
//		inPage= true;
//		OS.PMSessionBeginPageNoDialog(printSession, pageFormat, null);
//		int[] buffer = new int[1];
//		OS.PMSessionGetGraphicsContext(printSession, 0, buffer);
//		if (context == 0) {
//			context = buffer[0];
//		} else {
//			if (context != buffer[0]) SWT.error(SWT.ERROR_UNSPECIFIED);
//		}
//		PMRect paperRect= new PMRect();
//		OS.PMGetAdjustedPaperRect(pageFormat, paperRect);
//		OS.CGContextScaleCTM(context, 1, -1);
//		OS.CGContextTranslateCTM(context, 0, -(float)(paperRect.bottom-paperRect.top));
//		OS.CGContextSetStrokeColorSpace(context, colorspace);
//		OS.CGContextSetFillColorSpace(context, colorspace);
//	}
}

}
