//
//  $Id: SPNarrowDownCompletion.m 744 2009-05-22 20:00:00Z bibiko $
//
//  SPGrowlController.m
//  sequel-pro
//
//  Created by Hans-J. Bibiko on May 14, 2009.
//
//  This class is based on TextMate's TMDIncrementalPopUp implementation
//  (Dialog plugin) written by Joachim Mårtensson, Allan Odgaard, and H.-J. Bibiko.
//   see license: http://svn.textmate.org/trunk/LICENSE
//
//  This program is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation; either version 2 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
//  More info at <http://code.google.com/p/sequel-pro/>

#import "SPNarrowDownCompletion.h"
#import "SPArrayAdditions.h"
#import "ImageAndTextCell.h"
#import <Foundation/NSObjCRuntime.h>


@interface NSTableView (MovingSelectedRow)
- (BOOL)SP_NarrowDownCompletion_canHandleEvent:(NSEvent*)anEvent;
@end

@implementation NSTableView (MovingSelectedRow)
- (BOOL)SP_NarrowDownCompletion_canHandleEvent:(NSEvent*)anEvent
{
	int visibleRows = (int)floorf(NSHeight([self visibleRect]) / ([self rowHeight]+[self intercellSpacing].height)) - 1;

	struct { unichar key; int rows; } const key_movements[] =
	{
		{ NSUpArrowFunctionKey,              -1 },
		{ NSDownArrowFunctionKey,            +1 },
		{ NSPageUpFunctionKey,     -visibleRows },
		{ NSPageDownFunctionKey,   +visibleRows },
		{ NSHomeFunctionKey,    -(INT_MAX >> 1) },
		{ NSEndFunctionKey,     +(INT_MAX >> 1) },
	};

	unichar keyCode = 0;
	if([anEvent type] == NSScrollWheel)
		keyCode = [anEvent deltaY] >= 0.0 ? NSUpArrowFunctionKey : NSDownArrowFunctionKey;
	else if([anEvent type] == NSKeyDown && [[anEvent characters] length] == 1)
		keyCode = [[anEvent characters] characterAtIndex:0];


	for(size_t i = 0; i < sizeofA(key_movements); ++i)
	{
		if(keyCode == key_movements[i].key)
		{
			int row = MAX(0, MIN([self selectedRow] + key_movements[i].rows, [self numberOfRows]-1));
			[self selectRow:row byExtendingSelection:NO];
			[self scrollRowToVisible:row];

			return YES;
		}
	}

	return NO;

}

@end

@interface SPNarrowDownCompletion (Private)
- (NSRect)rectOfMainScreen;
- (NSString*)filterString;
- (void)setupInterface;
- (void)filter;
- (void)insertCommonPrefix;
- (void)completeAndInsertSnippet;
@end

@implementation SPNarrowDownCompletion
// =============================
// = Setup/tear-down functions =
// =============================
- (id)init
{
	if(self = [super initWithContentRect:NSZeroRect styleMask:NSBorderlessWindowMask backing:NSBackingStoreBuffered defer:NO])
	{
		mutablePrefix = [NSMutableString new];
		textualInputCharacters = [[NSMutableCharacterSet alphanumericCharacterSet] retain];
		caseSensitive = YES;
		filtered = nil;
		
		tableFont = [NSUnarchiver unarchiveObjectWithData:[[NSUserDefaults standardUserDefaults] dataForKey:@"CustomQueryEditorFont"]];
		[self setupInterface];
	}
	return self;
}

- (void)dealloc
{
	[staticPrefix release];
	[mutablePrefix release];
	[textualInputCharacters release];

	// TODO: This may cause errors, I cannot see if it is always set up - only if !dictMode.
	// [suggestions release];

	if (filtered) [filtered release];

	[super dealloc];
}

- (id)initWithItems:(NSArray*)someSuggestions alreadyTyped:(NSString*)aUserString staticPrefix:(NSString*)aStaticPrefix additionalWordCharacters:(NSString*)someAdditionalWordCharacters caseSensitive:(BOOL)isCaseSensitive charRange:(NSRange)initRange inView:(id)aView dictMode:(BOOL)mode
{
	if(self = [self init])
	{

		if(aUserString)
			[mutablePrefix appendString:aUserString];

		if(aStaticPrefix)
			staticPrefix = [aStaticPrefix retain];

		caseSensitive = isCaseSensitive;
		theCharRange = initRange;
		theView = aView;
		dictMode = mode;
		
		if(dictMode) {
			words = [NSArray arrayWithArray:suggestions];
		} else {
			suggestions = [someSuggestions retain];
			words = nil;
		}

		if(someAdditionalWordCharacters)
			[textualInputCharacters addCharactersInString:someAdditionalWordCharacters];

	}
	return self;
}

- (void)setCaretPos:(NSPoint)aPos
{
	caretPos = aPos;
	isAbove = NO;
	
	NSRect mainScreen = [self rectOfMainScreen];
	
	int offx = (caretPos.x/mainScreen.size.width) + 1;
	if((caretPos.x + [self frame].size.width) > (mainScreen.size.width*offx))
		caretPos.x = caretPos.x - [self frame].size.width;
	
	if(caretPos.y>=0 && caretPos.y<[self frame].size.height)
	{
		caretPos.y = caretPos.y + ([self frame].size.height + [tableFont pointSize]*1.5);
		isAbove = YES;
	}
	if(caretPos.y<0 && (mainScreen.size.height-[self frame].size.height)<(caretPos.y*-1))
	{
		caretPos.y = caretPos.y + ([self frame].size.height + [tableFont pointSize]*1.5);
		isAbove = YES;
	}
	[self setFrameTopLeftPoint:caretPos];
}

- (void)setupInterface
{
	[self setReleasedWhenClosed:YES];
	[self setLevel:NSStatusWindowLevel];
	[self setHidesOnDeactivate:YES];
	[self setHasShadow:YES];

	NSScrollView* scrollView = [[[NSScrollView alloc] initWithFrame:NSZeroRect] autorelease];
	[scrollView setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
	[scrollView setAutohidesScrollers:YES];
	[scrollView setHasVerticalScroller:YES];
	[[scrollView verticalScroller] setControlSize:NSSmallControlSize];

	theTableView = [[[NSTableView alloc] initWithFrame:NSZeroRect] autorelease];
	[theTableView setFocusRingType:NSFocusRingTypeNone];
	[theTableView setAllowsEmptySelection:NO];
	[theTableView setHeaderView:nil];

	NSTableColumn *column = [[[NSTableColumn alloc] initWithIdentifier:@"foo"] autorelease];
	//
	[column setDataCell:[ImageAndTextCell new]];
	[column setEditable:NO];
	[theTableView addTableColumn:column];
	[column setWidth:[theTableView bounds].size.width];

	[theTableView setDataSource:self];
	[scrollView setDocumentView:theTableView];

	[self setContentView:scrollView];
}

// ========================
// = TableView DataSource =
// ========================
- (int)numberOfRowsInTableView:(NSTableView *)aTableView
{
	return [filtered count];
}

- (id)tableView:(NSTableView *)aTableView objectValueForTableColumn:(NSTableColumn *)aTableColumn row:(int)rowIndex
{
	NSImage* image = nil;
	NSString* imageName = nil;
	if(!dictMode) {
		imageName = [[filtered objectAtIndex:rowIndex] objectForKey:@"image"];
		if(imageName)
			image = [NSImage imageNamed:imageName];
		[[aTableColumn dataCell] setImage:image];
		return [[filtered objectAtIndex:rowIndex] objectForKey:@"display"];
	}
	return [filtered objectAtIndex:rowIndex];

}

// ====================
// = Filter the items =
// ====================
- (void)filter
{
	NSRect mainScreen = [self rectOfMainScreen];

	NSArray* newFiltered;
	if([mutablePrefix length] > 0)
	{
		if(dictMode)
		{
			newFiltered = [[NSSpellChecker sharedSpellChecker] completionsForPartialWordRange:NSMakeRange(0,[[self filterString] length]) inString:[self filterString] language:nil inSpellDocumentWithTag:0];
		} else {
			NSPredicate* predicate;
			if(caseSensitive)
				predicate = [NSPredicate predicateWithFormat:@"match BEGINSWITH %@ OR (match == NULL AND display BEGINSWITH %@)", [self filterString], [self filterString]];
			else
				predicate = [NSPredicate predicateWithFormat:@"match BEGINSWITH[c] %@ OR (match == NULL AND display BEGINSWITH[c] %@)", [self filterString], [self filterString]];
			newFiltered = [suggestions filteredArrayUsingPredicate:predicate];
		}
	}
	else
	{
		if(dictMode)
			newFiltered = nil;
		else
			newFiltered = suggestions;
	}
	NSPoint old = NSMakePoint([self frame].origin.x, [self frame].origin.y + [self frame].size.height);
	
	int displayedRows = [newFiltered count] < SP_NARROWDOWNLIST_MAX_ROWS ? [newFiltered count] : SP_NARROWDOWNLIST_MAX_ROWS;
	float newHeight   = ([theTableView rowHeight] + [theTableView intercellSpacing].height) * displayedRows;
	
	float maxLen = 1;
	NSString* item;
	int i;
	BOOL spaceInSuggestion = NO;
	[textualInputCharacters removeCharactersInString:@" "];
	float maxWidth = [self frame].size.width;
	if([newFiltered count]>0)
	{
		for(i=0; i<[newFiltered count]; i++)
		{
			if(dictMode)
				item = NSArrayObjectAtIndex(newFiltered, i);
			else
				item = [NSArrayObjectAtIndex(newFiltered, i) objectForKey:@"display"];
			// If space in suggestion add space to allowed input chars
			if(!spaceInSuggestion && [item rangeOfString:@" "].length) {
				[textualInputCharacters addCharactersInString:@" "];
				spaceInSuggestion = YES;
			}

			if([item length]>maxLen)
				maxLen = [item length];
		}
		maxWidth = maxLen*16;
		maxWidth = (maxWidth>340) ? 340 : maxWidth;
	}
	if(caretPos.y>=0 && (isAbove || caretPos.y<newHeight))
	{
		isAbove = YES;
		old.y = caretPos.y + (newHeight + [tableFont pointSize]*1.5);
	}
	if(caretPos.y<0 && (isAbove || (mainScreen.size.height-newHeight)<(caretPos.y*-1)))
	{
		old.y = caretPos.y + (newHeight + [tableFont pointSize]*1.5);
	}
	
	// newHeight is currently the new height for theTableView, but we need to resize the whole window
	// so here we use the difference in height to find the new height for the window
	// newHeight = [[self contentView] frame].size.height + (newHeight - [theTableView frame].size.height);
	[self setFrame:NSMakeRect(old.x, old.y-newHeight, maxWidth, newHeight) display:YES];
	if (filtered) [filtered release];
	filtered = [newFiltered retain];
	[theTableView reloadData];
}

// =========================
// = Convenience functions =
// =========================
- (NSString*)filterString
{
	return staticPrefix ? [staticPrefix stringByAppendingString:mutablePrefix] : mutablePrefix;
}

- (NSRect)rectOfMainScreen
{
	NSRect mainScreen = [[NSScreen mainScreen] frame];
	NSScreen* candidate;
	enumerate([NSScreen screens], candidate)
	{
		if(NSMinX([candidate frame]) == 0.0f && NSMinY([candidate frame]) == 0.0f)
			mainScreen = [candidate frame];
	}
	return mainScreen;
}

// =============================
// = Run the actual popup-menu =
// =============================
- (void)orderFront:(id)sender
{
	[self filter];
	[super orderFront:sender];
	[self performSelector:@selector(watchUserEvents) withObject:nil afterDelay:0.05];
}

- (void)watchUserEvents
{
	closeMe = NO;
	while(!closeMe)
	{
		NSEvent* event = [NSApp nextEventMatchingMask:NSAnyEventMask
                                          untilDate:[NSDate distantFuture]
                                             inMode:NSDefaultRunLoopMode
                                            dequeue:YES];

		if(!event)
			continue;
		
		NSEventType t = [event type];
		if([theTableView SP_NarrowDownCompletion_canHandleEvent:event])
		{
			// skip the rest
		}
		else if(t == NSKeyDown)
		{
			unsigned int flags = [event modifierFlags];
			unichar key        = [[event characters] length] == 1 ? [[event characters] characterAtIndex:0] : 0;

			// Check if user pressed ⌥ to allow composing of accented characters.
			// e.g. for US keyboard "⌥u a" to insert ä
			if (([event modifierFlags] & (NSShiftKeyMask|NSControlKeyMask|NSAlternateKeyMask|NSCommandKeyMask)) == NSAlternateKeyMask || [[event characters] length] == 0)
			{
				[NSApp sendEvent: event];
				[mutablePrefix appendString:[event characters]];
				theCharRange = NSMakeRange(theCharRange.location, theCharRange.length+[[event characters] length]);
				[self filter];
			}
			else if((flags & NSControlKeyMask) || (flags & NSAlternateKeyMask) || (flags & NSCommandKeyMask))
			{
				[NSApp sendEvent:event];
				break;
			}
			else if([event keyCode] == 53) // escape
			{
				break;
			}
			else if(key == NSCarriageReturnCharacter)
			{
				[self completeAndInsertSnippet];
			}
			else if(key == NSBackspaceCharacter || key == NSDeleteCharacter)
			{
				[NSApp sendEvent:event];
				if([mutablePrefix length] == 0)
					break;

				[mutablePrefix deleteCharactersInRange:NSMakeRange([mutablePrefix length]-1, 1)];
				theCharRange = NSMakeRange(theCharRange.location, theCharRange.length-1);
				[self filter];
			}
			else if(key == NSTabCharacter)
			{
				if([filtered count] == 0)
				{
					[NSApp sendEvent:event];
					break;
				}
				else if([filtered count] == 1)
				{
					[self completeAndInsertSnippet];
				}
				else
				{
					[self insertCommonPrefix];
				}
			}
			else if([textualInputCharacters characterIsMember:key])
			{
				[NSApp sendEvent:event];
				[mutablePrefix appendString:[event characters]];
				theCharRange = NSMakeRange(theCharRange.location, theCharRange.length+1);
				[self filter];
			}
			else
			{
				[NSApp sendEvent:event];
				break;
			}
		}
		else if(t == NSRightMouseDown || t == NSLeftMouseDown)
		{
			[NSApp sendEvent:event];
			if(!NSPointInRect([NSEvent mouseLocation], [self frame]))
				break;
		}
		else
		{
			[NSApp sendEvent:event];
		}
	}
	[self close];
}

// ==================
// = Action methods =
// ==================
- (void)insertCommonPrefix
{
	int row = [theTableView selectedRow];
	if(row == -1)
		return;

	id cur = [filtered objectAtIndex:row];
	NSString* curMatch;
	if(dictMode)
		curMatch = [NSString stringWithString:cur];
	else
		curMatch = [cur objectForKey:@"match"] ?: [cur objectForKey:@"display"];
	if([[self filterString] length] + 1 < [curMatch length])
	{
		NSString* prefix = [curMatch substringToIndex:[[self filterString] length] + 1];
		NSMutableArray* candidates = [NSMutableArray array];
		for(int i = row; i < [filtered count]; ++i)
		{
			id candidate = [filtered objectAtIndex:i];
			NSString* candidateMatch;
			if(dictMode)
				candidateMatch = [filtered objectAtIndex:i];
			else
				candidateMatch = [candidate objectForKey:@"match"] ?: [candidate objectForKey:@"display"];
			if([candidateMatch hasPrefix:prefix])
				[candidates addObject:candidateMatch];
		}

		NSString* commonPrefix = curMatch;
		NSString* candidateMatch;
		enumerate(candidates, candidateMatch)
			commonPrefix = [commonPrefix commonPrefixWithString:candidateMatch options:NSLiteralSearch];

		if([[self filterString] length] < [commonPrefix length])
		{
			[self insert_text:commonPrefix];
			NSString* toInsert = [commonPrefix substringFromIndex:[[self filterString] length]];
			[mutablePrefix appendString:toInsert];
			theCharRange = NSMakeRange(theCharRange.location,[commonPrefix length]);
			[self filter];
		}
	}
	else
	{
		[self completeAndInsertSnippet];
	}
}

- (void)insert_text:(NSString* )aString
{
	[theView setSelectedRange:theCharRange];
	[theView insertText:aString];
}

- (void)completeAndInsertSnippet
{
	if([theTableView selectedRow] == -1)
		return;

	if(dictMode){
		[self insert_text:[[[filtered objectAtIndex:[theTableView selectedRow]] mutableCopy] autorelease]];
	} else {
		NSMutableDictionary* selectedItem = [[[filtered objectAtIndex:[theTableView selectedRow]] mutableCopy] autorelease];
		NSString* candidateMatch = [selectedItem objectForKey:@"match"] ?: [selectedItem objectForKey:@"display"];
		if([[self filterString] length] < [candidateMatch length])
			[self insert_text:candidateMatch];
	}
	closeMe = YES;
}
@end