//
//  MyDocument.m
//  LeanCalc
//
//  Created by Marc Liyanage on 31.01.05.
//  Copyright __MyCompanyName__ 2005 . All rights reserved.
//


/* todo

- num lock / esc clear expression

*/



#import "MyDocument.h"

@implementation MyDocument

- (id)init {
    self = [super init];
    if (!self) return nil;
	calculations = [[NSMutableArray alloc] init];
	return self;
}


- (void)dealloc {
	[calculations release];
	[super dealloc];
}


- (void)awakeFromNib {
	if (![self fileName]) {
		[arrayController add:self];
	}
	[arrayController setSelectionIndex:[calculations count] - 1];
}



- (IBAction)commit:(id)sender {

	if (![[sender stringValue] length]) return;

	if (![self lastItemIsSelected] && [[calculations lastObject] expressionIsEmpty]) {
		[arrayController setSelectedObjects:[NSArray arrayWithObject:[calculations lastObject]]];
		return;
	}
	[self addItem];
}



- (BOOL)lastItemIsSelected {
	id lastObject = [calculations lastObject];
	id selectedObject = [[arrayController selectedObjects] objectAtIndex:0];
	return selectedObject == lastObject;
}


- (void)addItem {
	Calculation *newcalc = [[[Calculation alloc] init] autorelease];
	[arrayController addObject:newcalc];
	int count = [calculations count];
	id secondtolast = [calculations objectAtIndex:count - 2];
	[secondtolast setValue:newcalc forKey:@"next"];
}


- (void)insertPrevious:(NSNumber *)sender {
	int index = [sender intValue];
	if ([calculations count] <= index) return;
	
	NSString *value = [[calculations objectAtIndex:[calculations count] - index - 1] valueForKey:@"result"];
	[[expressionField currentEditor] insertText:value];
}


- (NSArray *)control:(NSControl *)control textView:(NSTextView *)textView completions:(NSArray *)words forPartialWordRange:(NSRange)charRange indexOfSelectedItem:(int *)index {

	NSString *partialWord = [[textView string] substringWithRange:charRange];
	NSArray *completions = [[[NSApplication sharedApplication] delegate] completionsForPartialWord:partialWord];

	return completions;
}


// enable copy: menu command only when a previous result is selected
- (BOOL)validateMenuItem:(NSMenuItem *)item {
	if ([item action] != @selector(copy:)) return YES;
	id selectedObject = [[arrayController selectedObjects] objectAtIndex:0];
	return selectedObject && ![self lastItemIsSelected] && ![selectedObject expressionIsEmpty];
}

/*
- (BOOL)textView:(NSTextView *)aTextView doCommandBySelector:(SEL)aSelector {
	NSLog(@"text view by selector %d", aSelector);
	return NO;
}
*/


- (IBAction)copy:(id)sender {
	NSPasteboard *pboard = [NSPasteboard generalPasteboard];
	[pboard declareTypes:[NSArray arrayWithObject:NSStringPboardType] owner:nil];
	id selectedObject = [[arrayController selectedObjects] objectAtIndex:0];
	[pboard setString:[selectedObject result] forType:NSStringPboardType];
}


- (NSString *)windowNibName {
    return @"MyDocument";
}


- (void)windowControllerDidLoadNib:(NSWindowController *)aController {
	NSWindow *win = [aController window];
	[win performSelector:@selector(makeFirstResponder:) withObject:expressionField afterDelay:0.0];
    [super windowControllerDidLoadNib:aController];
}


- (NSData *)dataRepresentationOfType:(NSString *)aType {
	NSMutableData *data = [[[NSMutableData alloc] init] autorelease];
	NSKeyedArchiver *archiver = [[[NSKeyedArchiver alloc] initForWritingWithMutableData:data] autorelease];
	[archiver setOutputFormat:NSPropertyListXMLFormat_v1_0];
	[archiver encodeObject:calculations forKey:@"calculations"];
	[archiver finishEncoding];
	return data;
}


- (BOOL)loadDataRepresentation:(NSData *)data ofType:(NSString *)aType {
	NSKeyedUnarchiver *unarchiver = [[[NSKeyedUnarchiver alloc] initForReadingWithData:data] autorelease];
	[self setValue:[unarchiver decodeObjectForKey:@"calculations"] forKey:@"calculations"];
	[unarchiver finishDecoding];
    return YES;
}

@end