//
//  SPAlertSheets.m
//  sequel-pro
//
//  Created by Rowan Beentje on January 20, 2010.
//  Copyright (c) 2010 Rowan Beentje. All rights reserved.
//
//  Permission is hereby granted, free of charge, to any person
//  obtaining a copy of this software and associated documentation
//  files (the "Software"), to deal in the Software without
//  restriction, including without limitation the rights to use,
//  copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the
//  Software is furnished to do so, subject to the following
//  conditions:
//
//  The above copyright notice and this permission notice shall be
//  included in all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
//  OTHER DEALINGS IN THE SOFTWARE.
//
//  More info at <https://github.com/sequelpro/sequelpro>

#import "SPAlertSheets.h"
#import "SPMainThreadTrampoline.h"

@implementation SPAlertSheets

/**
 * Provide a simple alias of a NSApp-wide modal NSBeginAlertSheet which waits 
 * for a in calling class globally declared returnCode by reference which must 
 * be changed in the didEndSelector of the calling class, with a few differences:
 *  - printf-type format strings are no longer supported within the "msg"
 *    message text argument, preventing access of random stack areas for
 *    error text which contains inadvertant printf formatting.
 *  - The didDismissSelector is no longer supported
 *  - The sheet no longer needs to be orderOut:ed after use
 *  - The alert is always shown on the main thread.
 */
+ (void)beginWaitingAlertSheetWithTitle:(NSString *)title
                          defaultButton:(NSString *)defaultButton
                        alternateButton:(NSString *)alternateButton
                            otherButton:(NSString *)otherButton
                             alertStyle:(NSAlertStyle)alertStyle
                              docWindow:(NSWindow *)docWindow
                          modalDelegate:(id)modalDelegate
                         didEndSelector:(SEL)didEndSelector
                            contextInfo:(void *)contextInfo
                               infoText:(NSString *)infoText
                             returnCode:(NSInteger *)returnCode
{

	// Ensure execution on the main thread
	if (![[NSThread currentThread] isMainThread]) {
		return [[self onMainThread] beginWaitingAlertSheetWithTitle:title
		                                              defaultButton:defaultButton
		                                            alternateButton:alternateButton
		                                                otherButton:otherButton
		                                                 alertStyle:alertStyle
		                                                  docWindow:docWindow
		                                              modalDelegate:modalDelegate
		                                             didEndSelector:didEndSelector
		                                                contextInfo:contextInfo
		                                                   infoText:infoText
		                                                 returnCode:returnCode];
	}

	NSButton *aButton;

	// Initialize returnCode with a value which can't be returned as
	// returnCode in the didEndSelector method
	NSInteger initialReturnCode = -5;
	returnCode = &initialReturnCode;

	// Set up an NSAlert with the supplied details
	NSAlert *alert = [[[NSAlert alloc] init] autorelease];
	[alert setMessageText:title];

	aButton = [alert addButtonWithTitle:defaultButton];
	[aButton setTag:NSAlertDefaultReturn];

	// Add 'alternate' and 'other' buttons as appropriate
	if (alternateButton) {
		aButton = [alert addButtonWithTitle:alternateButton];
		[aButton setTag:NSAlertAlternateReturn];
	}

	if (otherButton) {
		aButton = [alert addButtonWithTitle:otherButton];
		[aButton setTag:NSAlertOtherReturn];
	}

	// Set alert  style
	[alert setAlertStyle:alertStyle ? alertStyle : NSWarningAlertStyle];

	// Set the informative message if supplied
	if (infoText) [alert setInformativeText:infoText];

	// Run the alert on the main thread
	[alert beginSheetModalForWindow:docWindow modalDelegate:modalDelegate didEndSelector:didEndSelector contextInfo:contextInfo];

	// wait for the sheet
	NSModalSession session = [NSApp beginModalSessionForWindow:[alert window]];

	for (;;) {

		// Since the returnCode can only be -1, 0, or 1
		// run the session until returnCode was changed in 
		// the didEndSelector method of the calling class
		if (returnCode != &initialReturnCode) break;

		// Execute code on DefaultRunLoop
		[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode 
								 beforeDate:[NSDate distantFuture]];

		// Break the run loop if sheet was closed
		if ([NSApp runModalSession:session] != NSRunContinuesResponse || ![[alert window] isVisible]) break;

		// Execute code on DefaultRunLoop
		[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode 
								 beforeDate:[NSDate distantFuture]];

	}
	
	[NSApp endModalSession:session];
	[NSApp endSheet:[alert window]];
}

@end

/**
 * Shorthand for SPOnewayAlertSheetWithStyle() with defaultButton=nil and alertStyle=NSWarningAlertStyle
 */
void SPOnewayAlertSheet(
	NSString *title,
	NSWindow *docWindow,
	NSString *msg)
{
	SPOnewayAlertSheetWithStyle(title, nil, docWindow, msg, NSWarningAlertStyle);
}

/**
 * A Send-and-forget variant for displaying alerts.
 * It will queue the alert on the main thread and *always* immediately return.
 *   Because of that there is no way to set a delegate and callback method
 * and there is only one default button.
 * If nil is passed as the button title it will be changed to @"OK".
 * If nil is passed as the window NSAlert will be modal
 */
void SPOnewayAlertSheetWithStyle(
	NSString *title,
	NSString *defaultButton,
	NSWindow *docWindow,
	NSString *msg,
	NSAlertStyle alertStyle)
{
	NSString *defaultText = (defaultButton)? defaultButton : NSLocalizedString(@"OK", @"OK button");
	
	dispatch_async(dispatch_get_main_queue(), ^{
		// Set up an NSAlert with the supplied details
		NSAlert *alert = [[[NSAlert alloc] init] autorelease];
		[alert setMessageText:title];
		
		NSButton *aButton = [alert addButtonWithTitle:defaultText];
		[aButton setTag:NSAlertDefaultReturn];
		
		// Set the informative message if supplied
		if (msg) [alert setInformativeText:msg];

		// Set style (Defaults to NSWarningAlertStyle)
		[alert setAlertStyle:alertStyle];
		
		// Run the alert
		if (docWindow) {
			[alert beginSheetModalForWindow:docWindow modalDelegate:nil didEndSelector:NULL contextInfo:NULL];
			[docWindow makeKeyWindow]; // Ensure the alerting window is frontmost
		} else {
			[alert runModal];
		}
	});
}

/**
 * Provide a simple alias of NSBeginAlertSheet, with a few differences:
 *  - printf-type format strings are no longer supported within the "msg"
 *    message text argument, preventing access of random stack areas for
 *    error text which contains inadvertant printf formatting.
 *  - The didDismissSelector is no longer supported
 *  - The sheet no longer needs to be orderOut:ed after use
 *  - The alert is always shown on the main thread.
 */
void SPBeginAlertSheet(
	NSString *title,
	NSString *defaultButton,
	NSString *alternateButton,
	NSString *otherButton,
	NSWindow *docWindow,
		  id modalDelegate,
		 SEL didEndSelector,
		void *contextInfo,
	NSString *msg) 
{
	NSButton *aButton;

	// Set up an NSAlert with the supplied details
	NSAlert *alert = [[[NSAlert alloc] init] autorelease];
	[alert setMessageText:title];
	aButton = [alert addButtonWithTitle:defaultButton];
	[aButton setTag:NSAlertDefaultReturn];

	// Add 'alternate' and 'other' buttons as appropriate
	if (alternateButton) {
		aButton = [alert addButtonWithTitle:alternateButton];
		[aButton setTag:NSAlertAlternateReturn];
	}
	if (otherButton) {
		aButton = [alert addButtonWithTitle:otherButton];
		[aButton setTag:NSAlertOtherReturn];
	}

	// Set the informative message if supplied
	if (msg) [alert setInformativeText:msg];

	// Run the alert on the main thread
	[[alert onMainThread] beginSheetModalForWindow:docWindow modalDelegate:modalDelegate didEndSelector:didEndSelector contextInfo:contextInfo];

	// Ensure the alerting window is frontmost
	[[docWindow onMainThread] makeKeyWindow];
}