/*
 File: ATColorTableController.m
 Abstract: A controller used by the ATImageTextCell to edit the color property. It is implemented in an abstract enough way to be used by a class other than the cell. 
 
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 */

#import "ATColorTableController.h"
#import "ATPopupWindow.h"

@implementation ATColorTableController

+ (ATColorTableController *)sharedColorTableController {
    static ATColorTableController *gSharedColorTableController = nil;
    if (gSharedColorTableController == nil) {
        gSharedColorTableController = [[[self class] alloc] initWithNibName:@"ColorTable" bundle:[NSBundle bundleForClass:[self class]]];
    }
    return gSharedColorTableController;
}

@synthesize delegate = _delegate;
@dynamic selectedColor, selectedColorName;

- (void)dealloc {
    [_colorList release];
    [_colorNames release];
    [_window release];
    [super dealloc];
}

- (void)loadView {
    [super loadView];
    _colorList = [[NSColorList colorListNamed:@"Crayons"] retain];
    _colorNames = [[_colorList allKeys] retain];
    [_tableColorList setIntercellSpacing:NSMakeSize(3, 3)];
    [_tableColorList setTarget:self];
    [_tableColorList setAction:@selector(_tableViewAction:)];
}

- (NSColor *)selectedColor {
    NSString *name = [self selectedColorName];
    if (name != nil) {
        return [_colorList colorWithKey:name];
    } else {
        return nil;
    }
}

- (NSString *)selectedColorName {
    if ([_tableColorList selectedRow] != -1) {
        return [_colorNames objectAtIndex:[_tableColorList selectedRow]];
    } else {
        return nil;
    }
}

- (void)_selectColor:(NSColor *)color {
    // Search for that color in our list
    NSInteger row = 0;
    for (NSString *name in _colorNames) {
        NSColor *colorInList = [_colorList colorWithKey:name];
        if ([color isEqual:colorInList]) {
            break;
        }
        row++;
    }    
    _updatingSelection = YES;
    if (row != -1) {
        [_tableColorList scrollRowToVisible:row];
        [_tableColorList selectRowIndexes:[NSIndexSet indexSetWithIndex:row] byExtendingSelection:NO];
    } else {
        [_tableColorList scrollRowToVisible:0];
        [_tableColorList selectRowIndexes:[NSIndexSet indexSet] byExtendingSelection:NO];
    }
    _updatingSelection = NO;
}

- (void)_createWindowIfNeeded {
    if (_window == nil) {
        NSRect viewFrame = self.view.frame;
        // Create and setup our window
        _window = [[ATPopupWindow alloc] initWithContentRect:viewFrame styleMask:NSBorderlessWindowMask backing:NSBackingStoreBuffered defer:NO];
        [_window setReleasedWhenClosed:NO];
        [_window setLevel:NSPopUpMenuWindowLevel];
        [_window setHasShadow:YES];        
        [[_window contentView] addSubview:self.view];
        [_window makeFirstResponder:_tableColorList];
        
        // Make the window have a clear color and be non-opaque for our pop-up animation
        [_window setBackgroundColor:[NSColor clearColor]];
        [_window setOpaque:NO];
    }
}

- (void)_windowClosed:(NSNotification *)note {
    if (_eventMonitor) {
        [NSEvent removeMonitor:_eventMonitor];
        _eventMonitor = nil;
    }
    [[NSNotificationCenter defaultCenter] removeObserver:self name:NSWindowWillCloseNotification object:_window];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:NSApplicationDidResignActiveNotification object:nil];
}

- (void)_closeAndSendAction:(BOOL)sendAction {
    [_window close];
    if (sendAction) {
        if ([self.delegate respondsToSelector:@selector(colorTableController:didChooseColor:named:)]) {
            [self.delegate colorTableController:self didChooseColor:self.selectedColor named:self.selectedColorName];
        }
    } else {
        if ([self.delegate respondsToSelector:@selector(didCancelColorTableController:)]) {
            [self.delegate didCancelColorTableController:self];
        }
    }
}

- (void)_windowShouldClose:(NSNotification *)note {
    [self _closeAndSendAction:NO];
}

- (void)editColor:(NSColor *)color locatedAtScreenRect:(NSRect)rect {
    [self _createWindowIfNeeded];
    [self _selectColor:color];
    NSPoint origin = rect.origin;
    NSRect windowFrame = [_window frame];
    // The origin is the lower left; subtract the window's height
    origin.y -= NSHeight(windowFrame);
    // Center the popup window under the rect
    origin.y += floor(NSHeight(rect) / 3.0);
    origin.x -= floor(NSWidth(windowFrame) / 2.0);
    origin.x += floor(NSWidth(rect) / 2.0);
    
    [_window setFrameOrigin:origin];
    [_window popup];
    
    // Add some watches on the window and application
    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(_windowClosed:) 
                                             name:NSWindowWillCloseNotification 
                                             object:_window];
   
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_windowShouldClose:) name:NSApplicationDidResignActiveNotification object:nil];
    
    // Start watching events to figure out when to close the window
    NSAssert(_eventMonitor == nil, @"_eventMonitor should not be created yet");
    _eventMonitor = [NSEvent addLocalMonitorForEventsMatchingMask:NSLeftMouseDownMask | NSRightMouseDownMask | NSOtherMouseDownMask | NSKeyDownMask handler: ^(NSEvent *incomingEvent) {
        NSEvent *result = incomingEvent;
        NSWindow *targetWindowForEvent = [incomingEvent window];
        if (targetWindowForEvent != _window) {
            [self _closeAndSendAction:NO];
        } else if ([incomingEvent type] == NSKeyDown) {
            if ([incomingEvent keyCode] == 53) {
                // Escape
                [self _closeAndSendAction:NO];
                result = nil; // Don't process the event
            } else if ([incomingEvent keyCode] == 36) {
                // Enter
                [self _closeAndSendAction:YES];
                result = nil;
            }
        }
        return result;
    }];
}

- (NSInteger)numberOfRowsInTableView:(NSTableView *)tableView {
    return _colorNames.count;
}

- (id)tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row {
    return [_colorNames objectAtIndex:row];
}

- (void)tableView:(NSTableView *)tableView willDisplayCell:(id)cell forTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row {
    NSColor *color = [_colorList colorWithKey:[_colorNames objectAtIndex:row]];
    [cell setColor:color];
}

- (void)_tableViewAction:(id)sender {
    [self _closeAndSendAction:YES];
}

@end